Dual polarised aperture-coupled patch antenna using asymmetrical feed

Dual polarised aperture-coupled patch antenna using asymmetrical feed
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使用不对称馈电的双极化孔径耦合贴片天线

DOI:
10.1049/iet-map.2014.0647
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发表时间:
2015-07
期刊:
IET Microw. Antennas Propag.,
影响因子:
--
通讯作者:
Xiaolin Qiao
Xiaolin Qiao
中科院分区:
其他
文献类型:
--
作者:
Lizhong Song;Ming Jin;Yong Han;Xiaolin Qiao

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双极化天线通常由对称馈电网络馈电,以便获得两个正交极化的对称辐射方向图。在这项研究中,一个双极化孔径耦合贴片天线,采用不对称馈电的X波段应用。利用非对称馈电结构激励双极化是有效的,并能实现与传统馈电网络一样的对称辐射方向图。此外,非对称馈电提供了宽的阻抗带宽和端口之间的高隔离度。关键参数研究和电流分布分析证明了非对称馈电的可行性。仿真和实测结果表明,阻抗带宽超过35.2%,隔离度高于30 dB的整个带宽。在E平面和H平面中,两种极化的交叉极化水平均低于−20 dB。此外,该天线原型在双极化方向图上显示出良好的对称性。
Dual polarised antennas are normally fed by symmetrical feed networks in order to obtain symmetrical radiation patterns for two orthogonal polarisations. In this study, a dual polarised aperture-coupled patch antenna using asymmetrical feed for X-band application is proposed. The exploitation of asymmetrical feed structure in exciting dual polarisations turns out to be valid, and is capable of realising symmetrical radiation patterns just as the traditional feed networks have done. Besides, the asymmetrical feed provides a wide impedance bandwidth and high isolation between ports. Key parameters studies and current distributions analysis prove the feasibility of the asymmetrical feed. Both simulated and measured results indicate an impedance bandwidth over 35.2% and the isolation is higher than 30 dB over the entire bandwidth. The cross-polarisation levels in the E- and H-planes for both polarisations are lower than −20 dB. Moreover, the antenna prototype shows good symmetrical property in radiation patterns for dual polarisations.
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