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8/12/2019 Schau Bert
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Antenna Lab
Vivaldi Antenna Arrays
Application to Focal Plane Array
Dan Schaubert
Anatoliy Boryssenko
University of Massachusetts Amherst413-545-2530
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Antenna Lab
Two Designs for THEA
Substrate Thickness = 3.15 mm Substrate Thickness = 1.6 mm
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Antenna Lab
THEA Demonstration
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Antenna Lab
Element Configurations
Metallic Fins
Ground Plane
Dielectric
Stripline Feed
Metallic Fin
Microstrip Feed
Dielectric
E
Ground Plane
E
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Antenna Lab
UMass TDIE MoM-MOT code
12
34
56
78
8
16
64
48
56
40
32
24
5x1 TSA Array
8x8 TSA Array
References:
[1] A. O. Boryssenko, Phased-array workshop, Eindhoven, June 11 2001.[2] A. O. Boryssenko, D. H. Schaubert, Predicted Performance of Small
Arrays of Dielectric-Free Tapered Slot Antennas, in:Antenna App. Symp.
Digest (Monticello, IL, 2001), pp. 250-279.
[3] --, Time-Domain Integral-Equation-Based Solver for Transient and
Broadband Problems in Electromagnetics,Presented at AMEREM 2002
Conf., To be published in UWB-6,(Annapolis, MR, 2002), pp. 1-11.
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Antenna Lab
Vias Suppress Dielectric Region Resonance
Without Vias
Example Three Scan Angles
With Vias
H-Plane Scan
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Antenna Lab
Element Pattern in Infinite Phased Array
Dielectric-Free Antenna
Active Gain - 0.8 GHz
-20
-15
-10
-5
0
0 15 30 45 60 75 90
Theta
Relativ
edB
G(0)
G(45)G(90) G(90)
Active Gain - 1.7 GHz
-20
-15
-10
-5
0
0 15 30 45 60 75 90
Theta
R
lativ
edB
G(0)
G(45)
e
Active Gain - 2.6 GHz
-20
-15
-10
-5
0
0 15 30 45 60 75 90
Theta
Relativ
edB
G(0)
G(45)G(90)
Active Gain - 1.25 GHz
-20
-14
-8
-2
4
0 15 30 45 60 75 90
Theta
Relativ
edB
G(0)
G(45)
G(90)
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Antenna Lab
Element Pattern in Infinite Phased Array
r= 2
Active Element Gain - 1.7 GHz
-20
-15
-10
-5
0
0 15 30 45 60 75 90
Theta
dB
Phi=0
Phi=45Phi=90
Active Element Gain - 0.8 GHz
-20
-15
-10
-5
0
0 15 30 45 60 75 90
Theta
dB
Phi=0
Phi=45
Phi=90
Active Element Gain - 2.1 GHz
-20
-15
-10
-5
0
0 15 30 45 60 75 90
Theta
dB
Phi=0
Phi=45
Phi=90
Active Element Gain - 1.25 GHz
-20
-15
-10
-5
0
0 15 30 45 60 75 90
Theta
dB
Phi=0
Phi=45
Phi=90
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Antenna Lab
Spin Linear Radiation Patterns
H-PlaneE-Plane D-Plane
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Antenna Lab
Configurations for Dual Polarization
On sides of box - phase centers not
coincident
Crossed at corners of box - difficultto feed at back of slot
Pair of slots forms element - reduced
bandwidth and potential anomalies
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Antenna Lab
Circular Polarization Performance with Imperfect Elements
Element PatternsCP Patterns with
Amp + Phase Control
This antenna is not optimized for performance
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Antenna Lab
Wideband Scan Range
E-Plane H-Plane
This antenna is not optimized for performance
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Antenna Lab
THEA Prototype Array
Designed and fabricated at
UMass Antenna Lab, 1999
1 - 5 GHz
Approx 25cm x 25cm x
10cm Measured central element
patterns and S parameters
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Antenna Lab
Central Element Patterns - 2.8 GHz
E-Plane H-Plane
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Antenna Lab
Central Element Patterns - 4.0 GHz
E-Plane H-Plane
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Antenna Lab
Central Element Patterns - 4.8 GHz
E-Plane H-Plane
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Antenna Lab
Central Element Patterns - D-Plane
3.6 GHz 5.4 GHz
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Antenna Lab
Central Element Gain
Broadside
500 E-Plane 500 H-Plane
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Antenna Lab
8-by-Infinite Element Patterns
From Craeye, Boryssenko and Schaubert, ICAP 03
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Antenna Lab
Mutual Coupling to Central Element 3 GHz
Co-Polarized Cross-Polarized
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Antenna Lab
H-Plane Coupling Magnitude
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Antenna Lab
8x8 phased TSA array: geometry & mesh
0 0.1 0.2 0.30
0.1
0.2
0.3
0.4
0.5
0.6
m
m
12
34
567
8
8
16
64
48
56
40
32
24
704 triangles &
916 RWG modes
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Antenna Lab
8x8 phased TSA array: 10:1 band VSWR
Broadside beam
45-deg diagonal plane scanning
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Antenna Lab
8-by-Infinite Array Impedance
Active impedances for broadside scan
From Craeye,
Boryssenko and
Schaubert, ICAP 03
Infinite in H-plane
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Antenna Lab
Self Admittances for 6x6 Array
Isolated Element
M t l Ad itt f 6 6 A
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Antenna Lab
Mutual Admittance for 6x6 Array
Isolated Element
f S G
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Antenna Lab
Radiation Patterns of Small Arrays - 0.8 GHz
Antenna Performance has not been optimized
R di ti P tt f S ll A 1 4 GH
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Antenna Lab
Radiation Patterns of Small Arrays - 1.4 GHz
Antenna Performance has not been optimized
R di ti P tt f S ll A 2 0 GH
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Antenna Lab
Radiation Patterns of Small Arrays - 2.0 GHz
Antenna Performance has not been optimized
V i ti ith O i R t
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Antenna Lab
Variation with Opening Rate
r = 4 r = 1
eRaz
D=32 cm
Dsl=2 cm
Ra = 0.1, 0.2 0.3
V i ti ith A t D th
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Antenna Lab
Variation with Antenna Depth
e0.1z
D=24, 32 40 cm
Dsl=2 cm
r = 4 r = 1
V i i i h C i Si
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Antenna Lab
Variation with Cavity Size
e0.1z
D=40 cm
Dsl=1.5, 2, 2.5 cm
r = 4 r = 1
Summary
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Antenna Lab
Summary
Can treat many cases of interest with existing
analysis / simulation tools
Large arrays extensively studied - reasonable level of
understanding
Small finite arrays - some study and understanding
Focal plane imaging behavior - very little study