Wideband Circularly Polarized Patch Antenna Using Broadband Baluns
Wideband Circularly Polarized Patch Antenna Using Broadband Baluns
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DOI：
10.1109/tap.2007.915427
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发表时间：
2008-02
影响因子：
5.7
通讯作者：
Yong-xin Guo;K. Khoo;L. Ong
中科院分区：
文献类型：
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作者：
Yong-xin Guo;K. Khoo;L. Ong
引入了一种包含宽带 90 度希夫曼移相器的新型 90 度宽带巴伦，作为增强双馈型微带天线宽带圆极化性能的手段。所提出的 90 度宽带巴伦在宽带宽 (~57.5%) 上提供良好的阻抗匹配、平衡功率分配和一致的 90 度 (plusmn5deg) 相移。对于双 L 探头情况，使用所提出的 90 度宽带巴伦的圆形贴片天线可实现测量阻抗 (S11< -10 dB) 和轴比 (AR < 3 dB) 带宽，分别为 60.24% 和 37.7%；对于四 L 探针情况，分别为 71.28% 和 81.6%。
A novel 90deg broadband balun comprising a broadband 90deg Schiffman phase shifter is introduced as a means of enhancing the wideband circular polarization performance of dual-fed type microstrip antennas. The proposed 90deg broadband balun delivers good impedance matching, balanced power splitting and consistent 90deg (plusmn5deg) phase shifting, across a wide bandwidth (~57.5%). A circular patch antenna utilizing the proposed 90deg broadband balun is shown to attain measured impedance(S11< -10 dB) and axial ratio (AR < 3 dB) bandwidths of 60.24% and 37.7%, respectively, for the dual L-probe case; and 71.28% and 81.6% respectively, for the quadruple L-probe case.