Hiroaki Sakamoto, Hidetoshi Makimura, K. Nishimoto, Y. Nishioka, Y. Inasawa
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Abstract
In this paper, we propose a method to decrease back-lobe radiation of the small Circular Polarized (CP) antenna. The proposed CP antenna is composed of four antenna elements arranged in a rotational symmetry at 90 degrees on the ground, which are excited with the same amplitude and 90 degrees phase difference. Each antenna element is formed by a spiral antenna branched from the near the middle of an inverted-L antenna. From the result of simulation, backward radiation of the proposed CP antenna can be decreased by 13 dB due to the addition of the spiral elements.
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