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A pattern-reconfigurable Yagi antenna over a mushroom-like EBG ground plane is presented in this paper. The yagi antenna consists of a driver, a reflector, and a director, which are stacked over a mushroom-like EBG ground plane. The reflector and the director can be changed at each other by adjusting RF p-i-n diode switches and the directional radiation pattern is reconfigured. A designed prototype...
A simple technique is developed to improve the axial ratio (AR) bandwidth and quality of circularly polarized stacked microstrip antennas (CPSMAs) using a new C-type single feed. The proposed antenna has been optimized and fabricated, and the computed results agree very well with measurements. The antenna has a 3 dB AR bandwidth of 11.6%, gain is more than 8.2 dBi and the impedance bandwidth for VSWR...
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