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| Broadband Circularly Polarized H-Shaped Aperture-Coupled Microstrip Patch Antenna |
| Zhang Hui; Zhang Xiao-fa; Yan Dun-bao; Yuan Nai-chang |
| School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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Abstract Design of broadband circularly polarized microstrip patch antenna which is coupled by two H-shaped apertures is presented in this paper. Based upon the proximity coupling feed by the Wilkinson power divider, the proposed antenna can have a standing wave bandwidth of about 47.5% and the axial-ratio value within 3dB is about 50%. The front-to-back ratio of the antenna radiation pattern is better than 21dB, which indicate the realization of the good circularly polarized and low backward radiation level characteristics.
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Received: 20 June 2005
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2007, Vol. 29 
