Bandwidth Enhancement for Patch Antenna Using PBG Slot Structure for 5, 6 and 9 GHz Applications
H. F. AbuTarboush, H. S. Al-Raweshidy and R. Nilavalan
Wireless Networks & Communications Group (WNCG), School of Engineering & Design, Brunel University, West London, UK.
ABSTRACT — A design strategy using Photonic Band Gap (PBG) structure on ground plane to achieve wider bandwidth for patch antenna is presented. It is found that, the impedance bandwidth has improved from 3.72% to 31.9
% at centre frequency 9 GHz after adding PBG on the ground plane. The antenna has multi band operations at 5, 6 and 9 GHz. E-Plane and H-plane radiation patter is
satisfied within this bands.
Fig. 1. Geometry and diminutions of the antenna.
Table 1. Comparison between bandwidth with and without PBG on the ground plane.
Frequency band
Bandwidth without PBG
Bandwidth with PBG
5 GHz 2.76% 5.5%
6 GHz 0% 5.9%
9 GHz 3.72% 31.95%
Fig. 2. The return loss for the antenna with and without PBG.
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Ansoft Corporation Radiation Pattern 5 Phi PBG 1
Cur ve Info dB(GainPhi) Setup1 : Sw eep1 Phi='0deg'
dB(GainPhi) Setup1 : Sw eep1 Phi='90deg'
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Ansoft Corporation Radiation Pattern 5 Theta PBG 1
Curv e Info dB( GainTheta) Setup1 : Sw eep1 Phi='0deg'
dB( GainTheta) Setup1 : Sw eep1 Phi='90deg'
5 GHz Phi 5 GHz Theta
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Ansoft Corporation Radiation Pattern 8.5 Phi PBG 1
Cur ve Info dB(GainPhi) Setup1 : Sw eep1 Phi='0deg'
dB(GainPhi) Setup1 : Sw eep1 Phi='90deg'
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Ansoft Corporation Radiation Pattern 8.5 Theta PBG 1
Curv e Info dB( GainTheta) Setup1 : Sw eep1 Phi='0deg'
dB( GainTheta) Setup1 : Sw eep1 Phi='90deg'
8.5 GHz Phi 8.5 GHz Theta
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Ansoft Corporation Radiation Pattern 9 Phi PBG 1
Cur ve Info dB(GainPhi) Setup1 : Sw eep1 Phi='0deg'
dB(GainPhi) Setup1 : Sw eep1 Phi='90deg'
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Ansoft Corporation Radiation Pattern 9 theta PBG 1
Curv e Info dB( GainTheta) Setup1 : Sw eep1 Phi='0deg'
dB( GainTheta) Setup1 : Sw eep1 Phi='90deg'
9 GHz Phi 9 GHz Theta
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Ansoft Corporation Radiation Pattern 9.5 Phi PBG 1
Curve Info dB( GainPhi) Setup1 : Sw eep1 Phi='0deg'
dB( GainPhi) Setup1 : Sw eep1 Phi='90deg'
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Ansoft Corporation Radiation Pattern 9.5 Theta PBG 1
Curve Info dB(GainTheta) Setup1 : Sw eep1 Phi='0deg'
dB(GainTheta) Setup1 : Sw eep1 Phi='90deg'
9.5 GHz Phi 9.5 GHz Theta Fig. 3. E-plane and H-plane radiation pattern for the antenna
III.CONCLUSION
A PBG structure in ground plane is shown to improve the impedance bandwidth from 3.72% to 31.9% comparing to a conventional patch antenna. The overall size for the antenna is 70 X 30 mm. The radiation patterns at 5, 8.5, 9 and 9.5 GHz have been provided. This antenna can be used in various wireless communication systems.
978-1-4244-4565-3/09/$25.00 ©2009 Crown
Authorized licensed use limited to: Brunel University. Downloaded on November 30, 2009 at 06:23 from IEEE Xplore. Restrictions apply.
