RF Absorbers Catalog
2011 Edition
© AEMI 2011Product specifi cations and descriptions in this document are subject to change without notice.
Actual products may differ in appearance from images shown.
❚ Rectangular chamber
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RF Absorber Products >
Standard Absorbers
Adapted Absorbers
Specialty absorbers
A wide range of high-quality standard absorbers for a variety of applications.
• Pyramidal AEP series page 11 • Wedge AEW series page 13 • Convoluted AEC series page 15
Absorbers developed to fit specific environmental conditions.
• Walkway AEWW series page 19 • Heavy Duty Walkway AEWW HD series page 21 • Wall Module AEWM series page 23 • Clean Room AEP X CR series page 25 • Ventilated AEP V series page 27 • Weatherproof WP series page 29 • Rubberized PC Series page 32 • Laminated AEL series page 34
Absorbers developed to fit specific applications.
• EMC AEPH series page 37 • Tuned Frequency AET series page 39 • Low Frequency AEP EM series page 41 • Millimeter Wave AEC MM series page 43
NEW PRODUCT
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Advanced ElectroMagnetics, Inc. (AEMI) has been serving the RF and EMC communities for 30 years. While AEMI’s primary focus is on our strong customer relationships, we have a solid theoretical knowledge base that has allowed us to grow into one of the top absorber and anechoic chamber manufacturers in the world.
1/ The ability to adapt off-the-shelf absorbers to meet specifi c needs
Our ability to offer individual solutions to each of our customers characterizes AEMI’s working philosophy.
We don’t just provide a selection of standard absorbers ; we understand our customers’ needs
and use our extensive industry knowledge and state-of-the-art capabilities to fi nd the best solution.
Innovative Absorbers: Made to Last>Did you know?
AEMI was founded in 1980 by Gabriel Sanchez and Leland Hemming, author of the well-known “Electromagnetic Anechoic Chambers: A Fundamental Design and Specifi cation Guide.”
Off-the-shelf product • High power absorber
Specifi c requirement • Custom enclosure • High power test module
Solution • Forced cooling air • Compact size • Portable with casters
Off-the-shelf product • Wall module
Specifi c requirement • High power target wall
Solution • Medium power reticulated absorbers • Permanently mounted fans
Off-the-shelf product • Tapered chambers
Specifi c requirement • Rectangular & custom-shaped chambers
Solution • Cost effective multiple units • Production line antenna testing
Off-the-shelf product • Pyramidal absorbers
Specifi c requirement • Tethered fi re suppression
Solution • Designed to solve specifi c application issues
Providing Customized Solutions
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2/ Top quality throughout the design, production & delivery process
Our 16,000 sq ft facility, located in San Diego, CA (USA), was built in 2002. The integrated quality management
processes are run using the most modern design, production and logistic equipment available.
➊ Design • Dielectric properties testing and software simulation predict absorber performance,
which is then verifi ed by testing.
• Absorber geometries have been refi ned over 30 years and hundreds of installations.
• Modeling software verifi es individual absorber and anechoic chamber performance.
• VSWR, Field Probing and other methods verify design performance
at the system level.
Our capabilities
❚ In-house design
Off-the-shelf product • All absorbers
Specifi c requirement • Cover systems, custom colors, treatments and coatings
Solution • Specially-engineered coatings for specifi c applications • New rubberized treatment now available for increased durability and weather resistance
Off-the-shelf product • All absorbers
Specifi c requirement • Shapes
Solution • Custom-cut shapes to accommodate unique treatments
Off-the-shelf product • Shielded chambers
Specifi c requirement • Avionics & aerospace shielding
Solution • Component & system shielding • Mixed-use FOD & EMI
Off-the-shelf product • Walkway absorbers
Specifi c requirement • RF impact of chamber support systems
Solution • GRP low noise stairs with non-slip tread
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➋ Cutting • AEMI works closely with foam manufacturers and uses the latest CAD-CAM
software and CNC-controlled foam cutting equipment to ensure consistent
geometries and dimensions.
• An in-house, custom-contour saw allows for the additional fl exibility required
by short, custom shapes or emergency runs.
• In-line trimming saws assure fi nal geometry and dimensional stability.
➌ Loading • A unique chemical composition creates the excellent electrical performance
(absorption and refl ectivity) and fi re retardant capabilities in our absorber products.
➍ Flammability and NRL Testing • Impregnation consistency is critical for the best fl ammability characteristics,
so in addition to the single dip system and custom impregnation equipment,
AEMI tests every batch of mix to meet NRL 8093 standards 1, 2 and 3.
➎ Drying • Our in-line drying oven uses a computer-controlled halogen-fi red system, allowing
for even heating and precise drying time.
Our absorber also meets the standards of TI #2693066, MIT MS-8-21,
and UL 94.
We invested in a halogen technology oven for its easy temperature regulation
and improved heat uniformity. Many manufacturers still use the older convection
technology.
• The speed of our single dip impregnator is computer-controlled, enabling us
to maintain uniform torque at any speed, ensuring the most uniform lossey
dielectric distribution possible.
+
+
+
❚ In-house contour saw
❚ Single dip impregnator
❚ Flammability testing
❚ Halogen-fi red drying line
• Loading consistency is critical for both electrical and fi re retardant capabilities.
Our unique single dip system binds the fi re retardants in the carbon matrix for
superior fi re retardant life, and also minimizes salt leach and reduces fl ammability.
As opposed to single dip, two dip systems load the fi re retardants into foam
that has already been loaded – this doesn’t allow the chemicals to fully absorb.
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➏ Assembly • Our state-of-the-art assembly stations provide unique custom solutions including
Chebychev patterns, custom chamber confi gurations, special tapers, custom door
treatments, pop up covers, and equipment treatments.
➐ Treatment • Special treatment can be made at this stage to answer special needs, such as door
treatment, covers or custom Chebychev patterns.
➑ Coating
❚ Assembly station
❚ Chebyshev aborbers
❚ Coating line ❚ Custom color absorbers with rubberized coating
• Consistent colors enhance the cosmetic appearance of your chamber.
• Custom coatings and colors are available.
• Rubberized coating improves durability.
+
➒ Final Absorber Refl ectivity Testing • The dielectric properties of our absorbers are tested using
a NIST-designed fi xture and software.
• We perform functional coax and arch testing. The coax fi xture
is over 10 meters long and is made in accordance with IEEE
Standard 1128-1998. Three arch confi gurations measure
the energy refl ected by the absorber from 1 GHz to 18 GHz.
❚ Coax test fi xture ❚ Arch testing
➓ Delivery & Installation • AEMI’s shipping department can arrange dedicated trucks,
rail or even ocean freighters to assist our customers worldwide.
• Our experienced installation managers supervise installations in
countries around the world and are supported by dedicated
project managers, product support engineers and numerous local
representatives.
❚ Delivery ❚ Installation
The new rubberized coating is a moisture resistant spray-on vinyl treatment that increases absorber
durability and lifespan. It that can be added to any pyramidal, wedge, or laminated absorber product. For more information, see page 32
• We use motorized coating lines with in-line fl ash dryers
to ensure a professional fi nish.
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3/ Continuous product innovation -
better fl exibility & quality
AEMI is continuously innovating and integrating new
partners.
1/ Supplier partnership
An absorber’s initial physical characteristics come from
its foam substrate. AEMI has worked very closely with
leading foam chemists to develop custom foam that is
specifi cally designed to address unique conditions.
The new matrix formula has an extended “memory”
which improves the stability of the absorbers throughout
repeated fl exing. This foam matrix also improves the
durability of the absorbers in high traffi c areas (walkways)
and reduces “tip drooping” of larger absorbers.
This new formula, called HyPyr-Flex, improves our
absorber’s durability while maintaining its outstanding
dielectric properties.
2/ Internal partnership with ORBIT/FR and SATIMO
AEMI joined the ORBIT/FR family in 1997. ORBIT/FR
specializes in the conception, manufacture and ins-
tallation of antenna and RF test and measurement
systems. Many of these test systems are installed in
anechoic chambers that utilize AEMI’s expertise in
absorber and full turn-key chamber solutions.
In 2008, ORBIT/FR and AEMI joined SATIMO, crea-
ting The Microwave Vision Group. SATIMO specializes
in unique multi-probe array systems which provide fast
electromagnetic fi eld scanning. The Microwave Vision
Group provides measurement and test solutions for the
Telecommunications, Automotive, Academic, Aerospace
and Defense markets.
Our knowledge spans test systems, absorbing materials,
and full chamber production. We offer integrated solu-
tions and the combination of our diverse portfolios helps
to prevent problems commonly created by using several
unaffi liated vendors to complete your project.
Full turn-key solution delivered by The Microwave Vision Group
CONTINUOUS TESTING
Extensive in-process verifi cation and testing is conducted throughout the manufacturing process.Critical verifi cations and tests include:
❚ Chamber and positioner
❚ Measurement system
❚ Chamber with special door absorbers
• Incoming material inspections• Mix testing• Carbon testing
• Impregnation process verifi cation• Drying process verifi cation• Dimensional verifi cation
• NRL testing• Arch tests• Coax tests• Final inspection
> AEMI’s Customer Satisfaction Program
Offering reliable products and services.
➊ Quality management
AEMI is a registered ISO 9001-2008 company. This Quality Management System ensures that:
• Our processes are focused on consistency and continuous improvement.
• Our products are designed to meet our customers’ needs.
➋ Quality policy
It is the primary objective and commitment of Advanced ElectroMagnetics, Inc. to provide products and
services of unsurpassed quality that meet or exceed customer requirements. We create an environment that
enables each employee to apply the proven benefi ts of our continuous improvement process. This will ensure
accomplishment of our quality objectives and goals, and total customer satisfaction.
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10
Standard
Absorbers>
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Pyramidal Absorbers - AEP Series>
> Applications: • All chamber types: aerospace & defense, telecom,
automotive, academic & research institutes
> Key features: • Excellent absorption over a broad frequency
range
> Shape: • Conventional pyramid: AEP-4 to AEP-60
• Twisted pyramid: AEP-36 to AEP-96, except AEP-60
> Frequency band: • From 30 MHz to 18 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 4’’ to 96’’ (10.2 cm to 243.8 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEP-XX, where XX designates absorber height
in inches
AEP-96-TW
AEP-18
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1/ Description
Broadband pyramidal absorber is manufactured
in two basic geometries, depending on size and
performance requirements:
• Conventional right pyramid
• Twisted pyramid
The AEP-4 to AEP-60 absorbers are a conventional
pyramid with a square base of uniform thickness, tapered
to a point.
2/ Increase wide angle performances with Twisted Pyramid
The Twisted Pyramid shape increases wide angle perfor-
mance and the peak’s mechanical support.
The AEP-72 to AEP-96 absorbers are based on a
unique geometry that has the peak twisted at 45 degrees,
creating alternate peaks and valleys, which increases
performance and reduces mismatch at the base tran-
sition. This twisted confi guration is also available in
AEP-36, AEP-48 and AEP-60 upon request.
3/ Specifi cations
AEP-4 AEP-6 AEP-8 AEP-12 AEP-18 AEP-24 AEP-36 AEP-48 AEP-60 AEP-72 AEP-96
Geometry Right/Twisted R R R R R R R/T R/T R T T
Height in 4 6 8 12 18 24 36 48 60 72 96 cm 10.2 15.2 20.3 30.5 45.7 61 91.4 122 152.4 182.9 243.8
Pyramids/Blocks per block 144 64 64 36 16 9 4 4 1 1 1
@ 30 MHz dB 5 7 8 9 15
@ 80 MHz dB 12 15 18 20 25
@ 125 MHz dB 15 28 30 33 35
@ 250 MHz dB 30 32 35 37 37 40
@ 500 MHz dB 30 35 37 40 40 43 45
@ 1.0 GHz dB 30 35 40 40 42 45 47 48 50
@ 3.0 GHz dB 30 33 37 40 45 45 50 50 50 50 50
@ 6.0 GHz dB 35 37 45 45 50 50 50 50 50 50 50
@ 10.0 GHz dB 40 40 50 50 50 50 50 50 50 50 50
@ 15.0 GHz dB 45 50 50 50 50 50 50 50 50 50 50
@ 18.0 GHz dB 50 50 50 50 50 50 50 50 50 50 50
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775 775 775 775 775 775
Weight lbs/pc. 2.5 3 4.5 6 9 13.5 18.5 25 30 42 60 kg/pc. 1.1 1.4 2 2.7 4.1 6.1 8.4 11.3 13.6 19 27.2
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AEP-4 mechanical drawing AEP-48-TW mechanical drawing
4” 48”
1”
4”
2”
12”
24”
24”
24”
24”
Increase durability & lifespan by adding our rubberized coating!
For more information, see page 32
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Wedge Absorbers - AEW Series>
> Applications: • Rectangular, tapered, shaped wall and custom
chambers
• Compact ranges
> Key features: • Direct energy in a given path
• Polarization sensitive
> Shape: • Wedge
> Frequency band: • From 80 MHz to 18 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
• 2’ x 4’ (60.96 cm x 121.92 cm)
> Height: • 4’’ to 48’’ (10.2 cm to 121.9 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEW-XX, where XX designates absorber height
in inches
AEW-24
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1/ Description
AEMI manufactures a full line of wedge materials to complement our pyramidal absorbers. The wedge anechoic
performance matches those of the pyramids, except that they are polarization sensitive.
These materials are used to direct energy in a given path so that it can be effi ciently absorbed by large, high
performance materials.
2/ Specifi cations
AEW-4 AEW-6 AEW-8 AEW-12 AEW-18 AEW-24 AEW-36 AEW-48
Height in 4 6 8 12 18 24 36 48 cm 10.2 15.2 20.3 30.5 45.7 61 91.4 122
Pyramids/Blocks per block 12 8 8 6 4 3 2 2
@ 125 MHz dB 20
@ 250 MHz dB 20 22 27
@ 500 MHz dB 21 23 27 32
@ 1.0 GHz dB 23 24 26 29 32 37
@ 3.0 GHz dB 27 30 34 37 42 42 47 47
@ 6.0 GHz dB 32 34 42 42 47 47 47 47
@ 10.0 GHz dB 37 37 47 47 47 47 47 47
@ 15.0 GHz dB 42 47 47 47 47 47 47 47
@ 18.0 GHz dB 47 47 47 47 47 47 47 47
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775 775 775
Weight lbs/pc. 2.5 4.5 6 8 12 16 25 31 kg/pc. 1.1 2 2.7 3.6 5.4 7.3 11.3 14
Note: Other frequencies are also available.
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AEW-36 mechanical drawing
36’’
6”
12’’24” 24”
Increase durability & lifespan by adding rubberized coating!
For more information, see page 32
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Convoluted Absorbers - AEC Series>
> Applications: • RCS & antenna measurement chambers
in the microwave & millimeter wave region
> Key features: • Excellent attenuation properties
• Good absorption characteristics
> Shape: • Convoluted
> Frequency band: • From 3 GHz to 30 GHz and higher
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 1.5’’ to 4’’ (3.8 cm to 10.2 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEC-XX, where XX designates absorber height
in inches
AEC-3
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1/ Description
AEMI offers Broadband Convoluted absorbers that are
manufactured from lightweight urethane foam impregna-
ted with a dielectric material.
The front surface is rippled, providing a good match to the
impinging wavefront.
2/ Exceptional absorption characteristics
The convoluted design, when properly loaded, exhibits
exceptional absorption characteristics in the millimeter
range, especially at wide angles of incidence. The convo-
luted material has properties desirable for applications
requiring high refl ectivity performance in conjunction with
low forward scattering characteristics.
3/ Specifi cations
AEC-1.5 AEC-3 AEC-4
Height in 1.5 3.0 4.0 cm 3.8 7.6 10.2
@ 3.0 GHz dB 20 25
@ 6.0 GHz dB 20 20 30
@ 10.0 GHz dB 30 30 40
@ 15.0 GHz dB 35 35 45
@ 30.0 GHz dB 45 45 50
Weight lbs/pc. 1 2 2.75 kg/pc. 0.5 1 1.2
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AEC-4 mechanical drawing
24.0’’ 24.0’’
1.0’
’
4.0’
’
Increase durability & lifespan by adding our rubberized coating!
For more information, see page 32
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❚ Chamber for Compact Range facility
❚ Multi-purpose measurement chamber
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Adapted
Absorbers>
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Walkway Absorbers - AEWW Series>
> Applications: • In-chamber access to devices, antennas under
test and support equipment
> Key features: • Excellent load bearing and wear characteristics
> Shape: • Flat
• Step
> Frequency band: • From 250 MHz to 30 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • Standard: 4’’ to 24’’ (10.2 cm to 61 cm)
• Custom sizes available up to 72’’
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEWW-XX, where XX designates internal absorber
height in inches
AEWW-18
Walkway Steps
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1/ Description
AEMI’s broadband walkway RF absorber is composed of a self-extinguishing polystyrene core placed in an interloc-
king pattern over a standard AEP type material. This structure is topped with a higher density polystyrene laminate.
The AEWW materials offer excellent load bearing and wear characteristics. The material’s ability to withstand higher
loads than most walkway materials is due to the construction technique.
At microwave frequencies, walkway performance is 10 to 15 dB less than standard absorbers of similar size.
Custom sizes and shapes can be provided. The walkway absorber is taller than standard absorber. We generally
recommend using walkways one size smaller than surrounding absorbers.
2/ Specifi cations
AEWW-4 AEWW-8 AEWW-12 AEWW-18 AEWW-24
Internal Height in 4 8 12 18 24 cm 10.2 20.3 30.5 45.7 61
Size in 24 x 24 x 5.5 24 x 24 x 9.5 24 x 24 x 14.5 24 x 24 x 21.5 24 x 24 x 29.5 cm 61 x 61 x 14 61 x 61 x 24.1 61 x 61 x 36.8 61 x 61 x 54.6 61 x 61 x 74.9
@ 250 MHz dB 20
@ 500 MHz dB 20 25
@ 1.0 GHz dB 20 20 25 30
@ 3.0 GHz dB 20 27 30 30 35
@ 6.0 GHz dB 25 35 35 35 40
@ 10.0 GHz dB 30 40 40 40 40
@ 15.0 GHz dB 35 40 40 40 40
@ 30.0 GHz dB 40 40 40 40 40
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775
Weight lbs/pc. 5.5 7 9 17.5 21.5 kg/pc. 2.5 3.2 4.1 7.9 9.8
Load capacity lbs 300 300 300 400 400 kg 136 136 136 181 181
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AEWW-18 24” x 48” mechanical drawing AEWW-12 mechanical drawing
Custom walkway step
24” 24”
24”
48”
24”
24”
21 1
/2’’
14 1
/2’’
21 1
/2’’ 10
3/4
’’
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Heavy Duty Walkway Absorbers - AEWW HD Series
>
> Applications: • In-chamber access to devices and antennas under
test and support equipment
• High-traffi c areas that are subject to heavier wear
due to equipment loading and unloading
> Key features: • Excellent high load bearing and wear characteristics
> Shape: • Flat
• Step
> Frequency band: • From 250 MHz to 30 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • Absorber: 4’’ to 24’’ (10.2 cm to 61 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEWM-XX-Y, where XX designates internal absorber
height in inches and Y designates panel width in feet
Heavy Duty Walkway
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1/ Description
The Heavy Duty Walkway Absorber provides a path to transmit and receive areas that will support heavier loads by
incorporating a high strength, load bearing grid into the walkway. This grid enables the walkway to support much
heavier loads than standard walkway. Custom sizes and shapes can also be provided, including much larger sizes
than standard walkway.
2/ Specifi cations
AEWW-4-HD AEWW-8-HD AEWW-12--HD AEWW-18-HD AEWW-24-HD
Height in 4 8 12 18 24 cm 10.2 20.3 30.5 45.7 61
Size in 24 x 24 x 5.5 24 x 24 x 9.5 24 x 24 x 14.5 24 x 24 x 21.5 24 x 24 x 29.5 cm 61 x 61 x 14 61 x 61 x 24.1 61 x 61 x 36.8 61 x 61 x 54.6 61 x 61 x 74.9
@ 250 MHz dB 20
@ 500 MHz dB 20 25
@ 1.0 GHz dB 20 20 25 30
@ 3.0 GHz dB 20 27 30 30 35
@ 6.0 GHz dB 25 35 35 35 40
@ 10.0 GHz dB 30 40 40 40 40
@ 15.0 GHz dB 35 40 40 40 40
@ 30.0 GHz dB 40 40 40 40 40
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775
Approx. Weight lbs/pc. 7.5 11 15 24 30 kg/pc. 3.4 5 6.8 10.9 13.6
Load capacity lbs 600 600 600 800 800 kg 272.2 272.2 272.2 362.9 362.9
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AEWW-24-HD mechanical drawing
29.5
’’
24.0’’ 24.0’’
0.5’
’
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Wall Module - AEWM Series>
> Applications: • Reduce moding problems
• Eliminate moding hot spots and resonances
> Key features: • Excellent low frequency performances
• Portable (with casters)
• Fast and easy assembly
> Shape: • Pyramidal
> Frequency band: • From 250 MHz to 1 GHz
> Panel size: Standard:
• 2’ x 8’ (60.96 cm x 243.84 cm)
• 4’ x 8’ (121.92 cm x 243.84 cm)
> Height: • Absorber: 12’’ to 36’’ (30.5 cm to 91.4 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Treatment: • Fire retardant
> Related certifi cations: • MIL-STD 461/462
• NRL 8093 – 1, 2, 3
> Ordering code: • AEWM-XX-Y, where XX designates absorber height
in inches and Y designates panel width in feet
Wall module
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1/ Description
The Wall Module is used in test facilities to absorb
interfering signals on a selective basis to help reduce
moding problems. The Wall Module also eliminates
moding hot spots and resonances while providing good
wide angle performance.
Wall Modules are shipped semi-assembled to protect
the absorbers. Simple instructions and easy-to-use
supplied hardware facilitate fast and easy assembly.
2/ Low frequency performances
The use of EM materials provides good low frequency
performance to accommodate MIL-STD 461/462
applications. The Wall Module is constructed of absorber
materials applied to 24 gauge sheet metal. This permits
increased effi ciency in absorbing characteristics and
allows the user to shield the test environment from
personnel or equipment behind the Wall Modules.
3/ Customization
The Wall Modules may also be ordered without the sheet
metal backing for customers who prefer not to have any
additional refl ective surfaces inside the enclosure.
Special Wall Modules can be designed using any of the
AEP or AEW products manufactured by AEMI.
A Baffl e Wall reduces the strength (level) of multiple
refl ections and resonant conditions which are typical in
shielded rooms at certain frequencies. Sound Baffl es
are a fundamental tool of mitigation, the practice of
minimizing reverberation. In an anechoic chamber, Baffl es
are applied to walls and ceilings to reduce undesirable
coupling in the measurement zone.
MULTIMODING
Various resonant modes are possible when radiated measurements are conducted within a shielded room, depending on room size, operating wavelength, and the geometricrelationship of the antennas. Multimoding can also occur as a function of the cavity dimensions and equipment placement when the test facility room size is greater than the wavelength of the frequency of operation.
4/ Specifi cations
AEWM- AEWM- AEWM- AEWM- AEWM- AEWM- AEWM- AEWM- 12-2 12-4 18-2 18-4 24-2 24-4 36-2 36-4
Height in 12 12 18 18 24 24 36 36
Absorber Panel ft 2 x 8 4 x 8 2 x 8 4 x 8 2 x 8 4 x 8 2 x 8 4 x 8 Description m .61 x 2.4 1.2 x 2.4 .61 x 2.4 1.2 x 2.4 .61 x 2.4 1.2 x 2.4 .61 x 2.4 1.2 x 2.4
@ 250 MHz dB 19 19 21 21 26 26 30 30
@ 500 MHz dB 26 26 29 29 32 32 36 36
@ 1.0 GHz dB 32 32 35 35 38 38 41 41
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775 775 775
Shipping Weight lbs 128 250 160 310 180 350 270 530(approx.) kg 58 113.4 72.6 140.6 81.6 158.8 122.5 240.4
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96.0
”
48.0” 48.0”
36.0”
AEWM 36-4 mechanical drawing
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Clean Room RF Absorbers - AEP-X-CR Series
>
> Applications: • Satellite testing facilities
• Space applications
> Key features: • For use in Class 100,000 clean room environments -
AEMI CR1
• For use in Class 10,000 clean room environments -
AEMI CR2
> Shape: • Pyramidal
• Wedge
• Flat
• Convoluted
> Frequency band: • From 125 MHz to 18 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • Standard: 4’’ to 48’’ (10.2 cm to 121.9 cm)
• Custom sizes available up to 96’’ (243.8 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Treatment: • CR1 - Latex coating
• CR2 - Rubberized coating
> Related certifi cations: • FS209E
• ISO14644
• NRL 8093 - 1, 2, 3
> Ordering code: • AEP-XX – CRX, where XX designates absorber
height in inches and CRX designates Clean
Room Class
AEP-36-CR
26
1/ Description
AEMI CR1 Clean Room RF Absorbers have a clear latex
coating that completely covers the absorber, including
the bottom. They are treated for use in class 100,000
clean room environments. This treatment does not ne-
gatively affect the overall performance. These absorbers
are used extensively in satellite assembly facilities as well
as other aerospace applications.
AEMI CR2 Clean Room RF Absorbers have a rubberized
treatment that completely covers the absorber, including
the bottom. They are treated for use in class 10,000
clean room environments. This treatment does not ne-
gatively affect the overall performance. These absorbers
are used extensively in satellite assembly facilities as well
as other aerospace applications.
2/ Unique Manufacturing Process
After the standard manufacturing process, these ma-
terials undergo further treatment to remove any loose
debris from the manufacturing process. The material is
coated with a special latex binder or plasticized coating
(depending on class).
3/ Specifi cations
AEP-4-CR AEP-6-CR AEP-8-CR AEP-12-CR AEP-18-CR AEP-24-CR AEP-36-CR AEP-48-CR
Height in 4 6 8 12 18 24 36 48 cm 10.2 15.2 20.3 30.5 45.7 61 91.4 121.9
Pyramids per block 144 64 64 36 16 9 4 4
@ 125 MHz dB 28
@ 250 MHz dB 30 32 35
@ 500 MHz dB 30 35 37 40
@ 1.0 GHz dB 30 35 37 40 42 45
@ 3.0 GHz dB 30 33 37 40 45 45 50 50
@ 6.0 GHz dB 35 37 45 45 50 50 50 50
@ 10.0 GHz dB 40 40 50 50 50 50 50 50
@ 13.0 GHz dB 45 50 50 50 50 50 50 50
@ 15.0 GHz dB 50 50 50 50 50 50 50 50
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775 775 775
Weight lbs/pc. 2.5 3 4.5 6 9 13.5 18.5 25 kg/pc. 1.1 1.4 2 2.7 4.1 6.1 8.4 11.3
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AEP-6-CR mechanical drawing
6” 1”
2”24” 24”
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Ventilated Absorbers - AEPV Series >
> Applications: • Chamber HVAC systems where air passage is critical
• Medium power applications
> Key features: • Allows air to move freely through absorber
> Shape: • Pyramidal
• Wedge
• Flat
> Frequency band: • From 125 MHz to 18 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 4’’ to 72’’ (10.2 cm to 121.9 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEPV-XX, where XX designates absorber
height in inches
Ventilated absorber
28
1/ Description
Ventilated absorbers are manufactured from special reticulated (open cell) foam. When used as a vent material, this
product allows air to move freely.
2/ Specifi cations
AEPV-4 AEPV-6 AEPV-8 AEPV-12 AEPV-18 AEPV-24 AEPV-36 AEPV-48
Height in 4 6 8 12 18 24 36 48 cm 10.2 15.2 20.3 30.5 45.7 61 91.4 121.9
Pyramids per block 144 64 64 36 16 9 4 4
@ 125 MHz dB 28
@ 250 MHz dB 30 32 35
@ 500 MHz dB 30 35 37 40
@ 1.0 GHz dB 30 35 37 40 42 45
@ 3.0 GHz dB 30 33 37 40 45 45 50 50
@ 6.0 GHz dB 35 37 45 45 50 50 50 50
@ 10.0 GHz dB 40 40 50 50 50 50 50 50
@ 15.0 GHz dB 45 50 50 50 50 50 50 50
@ 18.0 GHz dB 50 50 50 50 50 50 50 50
Power Watt/in2 1 1 1 1 1 1 1 1 Watt/m2 1550 1550 1550 1550 1550 1550 1550 1550
Weight lbs/pc. 2.5 3.5 4.5 6.5 8 11.5 16 22 kg/pc. 1.1 1.6 2 2.9 3.6 5.2 7.3 10
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3/ Medium Power Absorber Specifi cations
When the material is used as a medium power absorber,
it can safely dissipate 1 W/in2 CW with standard convec-
tion cooling. This is accomplished by the open cell cha-
racteristics of the reticulated foam, which increases the
ability of the absorber to dissipate the heat generated
by the absorption of the microwave energy. For higher
power applications of 2 - 3 W/in2 CW, material must be
force-cooled.
4/ Pressure Drop Specifi cations
HVAC professionals use pressure drop calculations to
ensure adequate air fl ow for proper air turn-over within
a chamber.
18’’
3’’
6’’24” 24”
AEPV-18 mechanical drawing
29
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Weatherproof Absorbers - WP Series >
> Applications: • Open area test sites
> Key features: • Withstands harsh outdoor conditions
• Resistant to UV rays, mildew, rot and abrasion
• Lifespan - up to 5 years for Type 1 and 5 -
10 years for Type 2
> Shape: • Type 1: Pyramidal, wedge, convoluted, and laminated
• Type 2: All absorber confi gurations available
> Frequency band: • From 125 MHz to 18 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 4’’ to 36’’ (10.2 cm to 91.4 cm)
• Type 2 up to 96” (243.8 cm)
> Operating conditions: • From 0º to 200º F (-18º
C to 93º
C)
> Indoor/outdoor: • Outdoor & indoor
> Treatment: • Type 1: Wrapped with a weather resistant/
vinyl-nylon based cloth coating
• Type 2: Rubberized coating
> Related certifi cations: • FS 191-5903
• MIL-C-43006
• NRL 8093 – 1, 2, 3
> Ordering code: • Type 1: AEP-XX-WP1, where XX designates absorber
height in inches
• Type 2: AEP-XX-WP2, where XX designates
absorber height in inches
WP Type 2
WP Type 1
WP Type 1 cross-section
Absorber Unloaded foam
Coated fabric wrapping
30
1/ Description of Type 1
Type 1 material is more physically robust. A standard pyramidal foam absorber is the base product. A low loss, un-
loaded front wedge is matched to the absorber, producing a rectangular shape.
The mating absorber “block” is then covered with a nylon-based textile that has high tear, mildew and UV resistance,
and superior abrasion resistance. All seams are glued with a vinyl adhesive and all side seams are stitched to ensure
long-term durability. This material expands and contracts with the cold and heat, and in high heat areas, a relief vent
is often added. Weatherproof Type 1 is intended for harsh use and is designed to withstand much more wear and
tear and repeated handling than regular absorber. Type 1 is not waterproof and while it will resist some rain, it is
recommended to store it under cover during storms or heavy rain. These materials can withstand UV and very harsh
weather conditions and have a life span of 1 to 5 years, depending on use and the local environmental conditions.
Storing the materials in a covered area when not in use can increase the life expectancy.
Specifi cations Type 1
AEP-4-WP1 AEP-6-WP1 AEP-8-WP1 AEP-12-WP1 AEP-18-WP1 AEP-24-WP1 AEP-36-WP1
Height in 4 6 8 12 18 24 36 cm 10.2 15.2 20.3 30.5 45.7 61 91.4
@ 500 MHz dB 20 25 27
@ 1.0 GHz dB 20 25 27 30 32
@ 3.0 GHz dB 20 23 27 30 35 35 40
@ 6.0 GHz dB 25 27 35 35 40 40 40
@ 10.0 GHz dB 30 30 40 40 40 40 40
@ 15.0 GHz dB 35 40 40 40 40 40 40
@ 18.0 GHz dB 40 40 40 40 40 40 40
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775 775
Weight lbs/pc. 1.2 1.5 2 2.5 3.5 4 7 kg/pc. 0.5 0.7 0.9 1.1 1.6 1.8 3.2
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2/ Description of Type 2
Type 2 utilizes AEMI’s rubberized coating technology, which is electrically neutral and therefore up to 10 dB bet-
ter than any other weatherproof absorber on the market. Type 2 treatment provides a moisture barrier that is fully
weatherproof, resistant to chemicals, fl uids and petroleum while also being abrasion and puncture resistant. Type 2
can be permanently mounted, and the life expectancy of Type 2 will be increased if stored inside when not in use.
The rubberized treatment is applied to all sides of WP2, including the bottom. Due to this, it is rated for class 10,000
clean room environments.
31
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Specifi cations Type 2
AEP-4-WP2 AEP-6-WP2 AEP-8-WP2 AEP-12-WP2 AEP-18-WP2 AEP-24-WP2 AEP-36-WP2
Height in 4 6 8 12 18 24 36 cm 10.2 15.2 20.3 30.5 45.7 61 91.4
@ 500 MHz dB 30 35 37
@ 1.0 GHz dB 30 35 37 40 42
@ 3.0 GHz dB 30 33 37 40 45 45 50
@ 6.0 GHz dB 35 37 45 45 50 50 50
@ 10.0 GHz dB 40 40 50 50 50 50 50
@ 15.0 GHz dB 45 50 50 50 50 50 50
@ 18.0 GHz dB 50 50 50 50 50 50 50
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775 775
Weight lbs/pc. 2.2 2.5 3 3.5 5 5.5 8.5 kg/pc. 1 1.1 1.4 1.6 2.3 2.5 3.9
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1.5’
’
8.0’
’
24.0’’ 24.0’’
AEP-8-WP2 mechanical drawingSTANDARD COLORS
• Yellow• Red• Blue
Custom color matching is available upon request.
32
Rubberized Absorbers - PC Series >
> Applications: • Doorways
• High-traffi c areas
• Access panels
• Equipment dressing
> Key features: • Extremely durable
• Withstands harsh operating conditions
• Lifespan - up to 10 years
> Shape: • Pyramidal
• Wedge
• Convoluted
• Laminated
> Frequency band: • From 125 MHz to 18 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • Up to 96” (243.8 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º C +/- 3º)
• Relative humidity: 55 % RH +/-15 %
> Indoor/outdoor: • Indoor
> Treatment: • Rubberized coating
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEP-X-PC, where X designates absorber height
in inches
AEP-18-PC
33
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2/ Specifi cations
AEP-4-PC AEP-6-PC AEP-8-PC AEP-12-PC AEP-18-PC AEP-24-PC AEP-36-PC
Height in 4 6 8 12 18 24 36 cm 10.2 15.2 20.3 30.5 45.7 61 91.4
@ 500 MHz dB 30 35 37
@ 1.0 GHz dB 30 35 37 40 42
@ 3.0 GHz dB 30 33 37 40 45 45 50
@ 6.0 GHz dB 35 37 45 45 50 50 50
@ 10.0 GHz dB 40 40 50 50 50 50 50
@ 15.0 GHz dB 45 50 50 50 50 50 50
@ 18.0 GHz dB 50 50 50 50 50 50 50
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775 775
Weight lbs/pc. 3.5 4 5.5 7 10 14.5 20 kg/pc. 1.6 1.8 2.5 3.2 4.5 6.6 9
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1/ Description
Rubberized absorber uses our new rubberized coating technology to signifi cantly increase absorber lifespan and
durability. This type of absorber is recommended for door ways or high-traffi c areas. The rubberized coating, which
is applied to the absorber top and sides, is abrasion and puncture resistant.
AEMI’s rubberized absorber is also electrically neutral, making it up to 10dB better than other weatherproof coatings.
It can be added to any pyramidal, wedge, laminated or convoluted absorber product.
STANDARD COLORS
• Red• Yellow• Blue
Custom color matching is available upon request.
34
Laminated Absorbers - AEL Series >
> Applications: • Small enclosures
• Wrapping masts & structures
• Shadowing obstacles
> Key features: • Lightweight, fl exible and wrappable
• Graded dielectric loading
> Shape: • Flat
> Frequency band: • From 400 MHz to 18 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 0.25’’ to 9’’ (0.6 cm to 22.9 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEL-XX, where XX designates absorber height
in inches
AEL-0.75
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1/ Description
AEL series absorbers are high performance multi-layer, lightweight, fl at, laminated radar absorbers. These products
are made from open cell polyurethane foam layers which are specially impregnated and laminated with fl exible
adhesives and latex. Consequently, they are fl exible and wrappable and may be pre-fi tted, cut with a sharp blade
or scissors, and bonded with contact adhesive for a strong, permanent bond. The absorber should be backed by a
refl ective surface. For optimum performance, AEMI can provide an optional conductive backing, if requested.
2/ Specifi cations
AEL-0.25 AEL-0.375 AEL-0.75 AEL-1.125 AEL-2.25 AEL-4.5 AEL-9.0
Height in 0.25 0.375 0.75 1.125 2.25 4.5 9.0 cm 0.64 0.95 1.9 2.86 5.72 11.43 22.86
Absorption @ dB > -20 > -20 > -20 > -20 > -20 > -20 > -20Normal Incidence
Weight lbs/pc. 0.5 0.75 1.25 1.9 3.65 5.1 11.65 kg/pc. 0.23 0.34 0.57 0.86 1.66 2.31 5.28
AEL-2.25 mechanical drawing AEL-4.50 mechanical drawing
2.25
’’ 4.5’
’
0.75
’’ 1.5’
’
24.0’’ 24.0’’ 24.0’’24.0’’
Increase durability & lifespan by adding our rubberized coating!
For more information, see page 32
36
Specialty
Absorbers>
3737
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EMC Absorbers - AEPH Series >
> Applications: • EMC / EMI chambers
• Mixed-use test facilities
• Pre-compliance & full compliance testing
> Key features: • Ferrite Hybrid Technology: Super-broadband
refl ectivity performance from 20 MHz to 20 GHz
• Flame resistant & fi re retardant
> Shape: • Standard pyramid
• Truncated pyramid
> Frequency band: • From 20 MHz to 20 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 8” to 60” (20.3 cm to 152.4 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Treatment: • Custom carbon-loaded top with no-load spacer
specifi cally designed for use with ferrite tiles
> Related certifi cations: • ANSI C63.4 (2000)
• CISPR 16, 22
• IEC/EN 61000-4-3
• MIL-STD 461/462
• NRL 8093 – 1, 2, 3
> Ordering code: • AEPH-XX, where XX designates absorber height
in inches
AEPH-12
38
1/ Description
AEMI offers a full array of high-performance/low-cost
absorber materials specifi cally designed to meet the
increased performance demands of today’s EMC testing
requirements. The HyPyr-LossTM product line includes
absorbers that satisfy all of today’s EMC applications.
Whether your testing regiment requires radiated im-
munity, emissions or a combination, ask our design
engineers to help you select the right absorber for your
application.
FERRITE HYBRID TECHNOLOGY
Ferrite absorbers offer good performance from 30 MHz to 600 MHz, while traditional dielectric foam absorbers deliver performance satisfaction above 500 MHz. The combination of these individual materials can yield precarious results if the selected materials have mismatched impedance characteristics.
With proper impedance matching, these two materials can be joined to create a hybrid absorber structure that benefi ts from the inherent performance characteristics of each of the individual materials. The AEPH series of EMC absorbers incorporates a urethane pyramidal absorber structure which can be precision matched to any brand of tuned ferrite tile absorber. The resulting product delivers Super-Broadband refl ectivity performance from 20 MHz to 40 GHz!
2/ Specifi cations
AEPH-08 AEPH-12 AEPH-18 AEPH-24 AEPH-36 AEPH-48
Height in 8 12 18 24 36 48 cm 20.3 30.5 45.7 61 91.4 121.9
Pyramids per block 64 36 16 9 4 4
@ 125 MHz dB 10 12 15 15 20 22
@ 250 MHz dB 13 17 18 18 22 24
@ 500 MHz dB 10 13 15 17 24 25
@ 1.0 GHz dB 8 10 13 15 20 22
@ 3.0 GHz dB 13 15 17 23 25 25
@ 10.0 GHz dB 15 17 20 20 25 30
Power Watt/in2 0.5 0.5 0.5 0.5 0.5 0.5 Watt/m2 775 775 775 775 775 775
Weight lbs/pc. 4.5 6.5 8 11.5 19 24 kg/pc. 2 2.9 3.6 5.2 8.6 10.9
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AEPH-24 mechanical drawing
24” 24”
4’’
2’’
24’’
3939
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Tuned Frequency Absorbers - AET-20 >
> Applications: • Lining radar nacelles (particularly where high power
is present)
> Key features: • Lightweight material reaching 20 dB attenuation
or better at tuned frequency
> Shape: • Flat
> Frequency band: • Refl ectivity: from 20 dB @ 10 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • Dependent upon frequency, i.e. X-band = 0.172’’
Nominal
> Operating conditions: • Temperature: -22º
F to +158º
F (-30º C to +70º
C)
> Indoor/outdoor: • Indoor and Outdoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AET-20
AET-20
40
1/ Description
Tuned Frequency RF absorber is a lightweight material
utilizing a dielectric core. Through the use of a phase
cancellation principle, attenuation equal to or greater
than 20 dB at the design frequency can be achieved.
The method of construction is a lamination of the
following components:
• Conductive Front Layer
• Polyethylene Core
• Refl ective Back Layer
The components are laminated such that the refl ec-
ted wave coming off the back of the material is out of
phase when it arrives at the front through the dielectric.
Therefore, it has a canceling effect with the transmitted
wavelength at the face of the material, thereby reducing
its refl ectivity.
2/ Typical properties
• Resistance to fuel, oil, & solvents - Good
• Self-supporting - Good
• Abrasion resistance - Fair
• Flexural capacity - Poor
3/ Specifi cations
AET-20
Base Laminate of fi berglass cloth with a polyethylene foam spacer and an aluminum foil refl ector.
Height in Dependent upon frequency i.e. X-band = 0.172’’ Nom.
Absorption @ dB 20 dB at design frequencyNormal Incidence
Power 3.0 Watts/Sq. In. @ 23°C C.W.
Weight lbs/ft2 Dependent upon frequency i.e. X-band = 0.16 lb/sq. ft.
AET-20 mechanical drawing
0.17
2’’
24’’ 24’’
US government customers: Save time by ordering this product using our National Stock Number - NSN 6625-00-790-0232
4141
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Low Frequency Absorbers - AEP-EM Series >
> Applications: • Low frequency measurement in medium size
chambers
• Multiple refl ection and resonant condition reduction
> Key features: • High loss at low frequency
• Minimum thickness
• Stackable to build temporary wall
• Allows for greater repeatability
> Shape: • Pyramidal
> Frequency band: • From 30 MHz to 1000 MHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 12’’ to 48’’ (30.5 cm to 121.9 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEP-XX-EM, where XX designates absorber
height in inches
AEP-12-EM
42
1/ Description
Low Frequency absorbers should be used in order to
reduce the multiple refl ection and resonant conditions
typical in shielded rooms at frequencies from 30 MHz to
1000 MHz. The use of these materials allows for grea-
ter repeatability of tests performed within a shielded
room. Due to the extremely long wavelength at 30 MHz,
conventional pyramidal absorbing materials must be ex-
tremely thick because the performance of the absorber
drops off rapidly as the material becomes less than one
quarter wavelength in thickness. In order to minimize this
roll off and improve the overall loss characteristics, AEMI
has developed low frequency absorber using special
materials. These materials have proven to be extremely
effective in medium size shielded rooms.
2/ A unique graded dielectric approach
The EM material is essentially a pyramidal front mate-
rial properly loaded to match successive layers of gra-
ded dielectric foam. This design allows for the proper
matching of the material to free space by initially provi-
ding a tapered impedance match through the pyramidal
front.
After the energy has entered the material, it is then suc-
cessively passed on to higher and higher dielectrically
loaded layers which enhance the energy dissipation cha-
racteristics. It is through this gradual change in dissipa-
tion that high loss at low frequencies can be achieved.
The design of this graded dielectric approach provides
the user with 33% more lossy dielectric material than
the use of conventional pyramidal material of equal size.
This added dielectric material provides increased per-
formance at low frequencies. The graded design also
increases the wide angle performance of these products
with respect to conventional pyramidal materials. Typical
performance increases at normal incidence are 3-6 dB
and 6-10 dB at wide angles.
3/ A high fl exibility of use
Another feature of this series is its ability to be stacked.
This allows the engineer to provide a temporary wall of
absorptive material for the elimination of hot spots in a
shielded facility. This mobility also gives the freedom to
alter the test environment whenever conditions and re-
quirements change. Resonance of the shielded cavity
can be altered at will by the proper placement of this
series of absorbers.
4/ Specifi cations
AEP-12-EM AEP-18-EM AEP-24-EM AEP-36-EM AEP-48-EM
Height in 12 18 24 36 48 cm 30.5 45.7 61 91.4 121.9
@ 30 MHz dB 6 9
@ 50 MHz dB 8 12 16
@ 100 MHz dB 9 11 14 21 27
@ 250 MHz dB 19 21 26 30 34
@ 500 MHz dB 26 29 32 36 39
@ 1000 MHz dB 32 35 38 41 44
Weight lbs/pc. 10 16.5 17 27 36 kg/pc. 4.5 7.5 7.7 12.2 16.3
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AEP-24 EM mechanical drawing
12’’
12’’
24’’ 24’’
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For more information, see page 32
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Millimeter Wave Absorbers - AEC-MM Series >
> Applications: • Millimeter wave measurement chambers
• RCS testing
> Key features: • Optimized for millimeter wave operation
• Excellent refl ectivity at normal incidence up to 55 dB
> Shape: • Convoluted
> Frequency band: • From 12 GHz to 95 GHz
> Standard base size: • 2’ x 2’ (60.96 cm x 60.96 cm)
> Height: • 5’’ to 12’’ (12.7 cm to 30.5 cm)
> Operating conditions: • Temperature: 70º F +/- 10º (21º
C +/- 3º)
• Relative humidity: 55 % RH +/-15
%
> Indoor/outdoor: • Indoor
> Related certifi cations: • NRL 8093 – 1, 2, 3
> Ordering code: • AEC-4/1-MM, AEC-4/1-MM-HP, AEC-4/5-XXT-MM,
AEC-4/6-XXT-MM, where XX designates absorber
height in inches
AEC-4/6-12T-MM
44
1/ Description
Custom designs for a low-grazing application has lead to
the development and manufacture of AEMI’s Millimeter
Wave tapered absorbers. These materials were develo-
ped for chamber applications where main beam energy
of the source antenna was focused on the sidewalls of
the chamber, due to its long overall length. These mate-
rials were effectively used in the overall chamber design
to provide the required test environment at 45 GHz.
• Type AEC-4-MM is our standard material optimized for
millimeter wave operation. By proper selection of the
carbon loading, refl ectivity on the order of 45 to 50 dB
has been attained consistently at normal incidence
over the 18 to 40 GHz frequency range.
• Type AEC-4/1-MM-HP is a high performance mate-
rial using convoluted front face foam which has a very
regular cell structure and is essentially window free.
By properly selecting the carbon loading, refl ectivity
on the order of 50 to 55 dB has been consistently
attained at normal incidence at 95 GHz. The mate-
rial has a second layer that is necessary to provide
the low frequency performance of -40 dB at 28 GHz.
Good performance down to 10 GHz is achievable by
properly adjusting the backing material.
• Type AEC-4/5-8T-MM is a high performance material
for use in long, narrow chambers where the energy
illuminating the side walls is arriving at about 10-25°
grazing. This material is designed to provide about
-35 dB forward scatter loss at those angles from
18-40 GHz. The units must be installed back-to-back
in pairs to achieve the specifi ed performance.
• Type AEC-4/6-12T-MM is the same as Type AEC-4/5-
MM, but optimized for lower frequencies.
2/ Specifi cations
AEC-4/1-MM-HP AEC-4/6-12T-MM AEC-4/5-8T-MM AEC-4-MM
Overall height in 5 6 to 12 5 to 8 4 cm 12.7 15.2 to 30.5 12.7 to 20.3 10.2
Refl ectivity - 40 dB @ 18 GHz - 50 dB @ 12-40 GHz - 50 dB @ 12-40 GHz - 45 dB @ 18
Absorption @ dB - 50 dB @ 95 GHz Grazing @ 10° Grazing @ 10° 40 GHzNormal Incidence - 35 dB @ 12-40 GHz - 35 dB @ 12-40 GHz
Weight per Sq. ft lbs 3.7 2.6 1.9 2.75 kg 1.7 1.2 0.9 1.25
Fire Protection Base NRL 8093 NRL 8093 NRL 8093 NRL 8093
Color Black Blue* Blue* Blue*
*Light color application over black
AEC-4/1-MM-HP mechanical drawing
24.0’’ 24.0’’
1.0’
’
5.0’
’
❚ Custom Chamber Projects
46
❚ Installation of an aerospace measurement chamber
❚ Aerospace measurement chamber in use Photo courtesy of Alenia Aeronautica
47
Notes>
> Contact us:
North America
ORBIT/FR’s Corporate Headquarters
506 Prudential Road
Horsham, PA 19044, USA
Tel: +1 215 674 5100
Fax: +1 215 674 5108
SATIMO USA
2105 Barrett Park Dr., Suite 104
Kennesaw, GA 30144, USA
Tel: +1 678 797 9172
Fax: +1 678 797 9173
AEMI
9311 Stevens Rd
Santee (San Diego),
CA 92071-2809, USA
Tel: +1 619 449 9492
Fax: +1 619 449 1553
EMEA
SATIMO’s Corporate Headquarters
17, avenue de Norvège
91 953 Courtaboeuf, FRANCE
Tel: +33 (0)1 69 29 02 47
Fax : +33 (0)1 69 29 02 27
SATIMO Bretagne
Technopole Brest Iroise
Z.I. du Vernis
225 rue Pierre Rivoalon
29200 Brest, FRANCE
Tel: +33 (0)2 98 05 13 34
Fax: +33 (0)2 98 05 53 87
SATIMO Italy
Via dei Castelli Romani, 59
00040 Pomezia (Rome), ITALY
Tel: +39 06 89 99 53 11
Fax: +39 06 89 99 53 24
ORBIT/FR Germany
Johann-Sebastian-Bach-Str. 11
Vaterstetten 85591, GERMANY
Tel: +49 (0)8106 99606 0
Fax: +49 (0)8106 99606 77
Microwave Vision Sweden
PO Box 35
44121 Alingsas, SWEDEN
Tel: + 46 31 402430
Fax: + 46 31 402430
ORBIT/FR Israel
1 Gesher Ha’Ets Street
Emek Hefer Industrial Park
P.O.Box 12096
Emek Hefer 38777, ISRAEL
Tel: +972 74 7130130
Fax: +972 4 6247375
Asia
SATIMO Hong-Kong
Suite 702, 7th fl oor Cyberport 1
100 Cyberport Road
Pok Fu Lam, HONG KONG
Tel: +852 2989 6128
Fax: +852 2989 6108
Microwave Vision Japan
6-20-11 Shinbashi-IK Bldg. 1F
Shinbashi, Minato-ku
Tokyo 105-0004, JAPAN
Tel: +81 3 6426 0432
Fax: +81 3 3435 3233 Gra
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www.microwavevision.com / [email protected] / [email protected]
About AEMI
AEMI specializes in the design and manufacture of absorbers and anechoic
chambers. Founded in 1980, the company, together with ORBIT/FR and SATIMO, is
now part of The Microwave Vision Group, delivering full turn-key test solutions for the
microwave community.
AEMI customer satisfaction program
Our customer support program includes before and after sales service:
• A technical support engineer is dedicated to each product or geographic area.
• A maintenance and support team guarantees that customers get quick
and effi cient support from the installation stage onwards.