Design and Fabrication of a compact single band Planar Inverted

F-Antenna

Presented By :

Hrudya

M.Tec ECE

ObjectivesObjectives

The objectives of the work are as follows:

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AbstractAbstract An Antenna converts electromagnetic radiation into electric current, or

vice versa.

Need of Antenna :

For transmission and reception of the radio signal.

Wireless performance is completely dependent on a high performance antenna design

and implementation.

PIFA antenna structure is one of the most promising candidate in the

category of antennas used in handheld devices.

The proposed antenna is simulated with commercially available

software Ansoft HFSS.

The dimensions of the antenna is designed and optimized to meet the

required characteristics.

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Planar Inverted-F Antenna Planar Inverted-F Antenna (PIFA)(PIFA)

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PIFA from MonopolePIFA from Monopole

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PIFA as a PIFA as a /4 Antennaλ/4 Antennaλ

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Principle of operationPrinciple of operation

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The patch acts approximately as a resonant cavity (short circuit

walls on top bottom and side, open-circuit walls on the other side).

If the antenna is excited at a resonant frequency, a strong field is set

up inside the cavity, and a strong current on the surface of the

patch.

The electric fields that extend out from the open circuit edge of

PIFA (called fringing felids ) causes PIFA to radiate.

This produces significant radiation.

Feeding techniqueFeeding technique

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Basic Equation Basic Equation L1 + L2-W = λ/4 (1)

Where L1 is Top patch length

L2 is Top patch Width

λ is wavelength corresponding to resonant frequency

But λ = c/f

PIFA sits on top of a dielectric substrate with permittivity €r

L1 + L2-W = c /4f√€r

When W/L2=1 then

L1 = λ/4

(2)

When W=0 then

L1 + L2 = λ/4

(3)

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Advantages

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The Low weight and small volume.

Low fabrication cost.

Mechanically robust.

Capable of dual and triple frequency operations.

Geometry allows electronic peripherals to wedge in between the

spaces .

Software used to design the Software used to design the antennaantenna

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The HFSS stands for High Frequency

Structural Simulator.

HFSS is commercial finite element method

solver for electromagnetic structures from

Anasys Corp.

It is one of the several commercial tools

used for antenna design

SIMULATIONS & SIMULATIONS & RESULTSRESULTS

Proposed Design Proposed Design

Detailed Dimensions 3D View in HFSS

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Detailed DimensionsDetailed Dimensions

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Parameter Value (mm)

Lg 120

Wg 50

Lp 50

Wp 21

Hs 10

Ws 1

Hsub 1.6

Simulated Return Loss (S11)Simulated Return Loss (S11)

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Simulated 3D Radiation PatternSimulated 3D Radiation Pattern

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Simualted Gain (dB)Simualted Gain (dB)

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HARDWARE HARDWARE IMPLEMENTATION & IMPLEMENTATION &

RESULTSRESULTS

Fabricated AntennaFabricated Antenna

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Return Loss (measured)Return Loss (measured)

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Radiation Pattern (measured in xy Radiation Pattern (measured in xy plane)plane)

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Radiation Pattern (measured in yz Radiation Pattern (measured in yz plane)plane)

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Radiation Pattern (measured in xz Radiation Pattern (measured in xz plane)plane)

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CONCLUSIONCONCLUSION

Conclusion and Future Scope Conclusion and Future Scope

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Few conclusions drawn from this work are:

Agreement between simulation results and measurement data is

good.

The designed single-band antenna, built on PIFA structure, is very

sensitive to any changes to the dimensions of the structure including

the ground plane.

Only precise fabrication can yield the simulated results . Even small

changes in dimensions can affect the performance significantly.

Future Scope:

The design proposed here can be extended for supporting multi band

applications .

ApplicationsApplications

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The proposed antenna covers GSM 800 (890 to 915 MHz ) band.

Used in Mobile Communication System.(800 MHz).

ReferencesReferences[1] Kin-Lu Wong, “Planar Antennas for Wireless Communication”, Published John Wiley & Sons, Inc., Chapter: 2,

Page(s): 26-65, 2003.

[2] P. S. Hall, E. Lee, and C. T. P. Song, “Planar inverted-F antennas,” in Printed Antennas for Wireless Communications, R. Waterhouse, Ed. Hoboken, NJ: Wiley, 2007, ch. 7

[3] Naveen Kumar , Garima Saini ,A Novel Low profile Planar Inverted-F Antenna (PIFA) for Mobile Handsets,International Journal of Scientific and Research Publications, Volume 3, Issue 3, March 2013.

[4] Hang Wong, Kwai-Man Luk, Chi Hou Chan, QuanXue, Kwok Kan So, HauWah Lai, “Small antennas in Wireless Communications”, Proceedings of the IEEE Journal, July 2012.

[5] Ray J.A, Chaudhuri S.R.B., “A review of PIFA technology”, IEEE Indian Antenna week (IAW),Dec. 2011.

[6] Belhadef, Y.; BoukliHacene, N., “PIFAS antennas design for mobile communications”, 7th IEEE International Workshop on Systems, Signal Processing and their Applications (WOSSPA), May 2011.

[7] SinhyungJeon, Hyengcheul Choi, and Hyeongdong Kim, “Hybrid Planar Inverted-F Antenna with a T-shaped slot on the ground plane”, ETRI Journal, Vol. 31, October 2009.

[8] Krzysztofik, W.J.; Skikiewicz, A., “Tapered PIFA Antenna for Handsets Terminals”, 17th IEEE International Conference on Microwaves, Radar and Wireless Communications (MIKON), May 2008.

 

 

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