A Wideband Polarization Reconfigurable Antenna With Partially Reflective Surface
A Wideband Polarization Reconfigurable Antenna With Partially Reflective Surface
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DOI：
10.1109/tap.2016.2593716
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发表时间：
2016-10-01
影响因子：
5.7
通讯作者：
Gong, Shu-Xi
中科院分区：
文献类型：
--
作者：
Ji, Lu-Yang;Qin, Pei-Yuan;Gong, Shu-Xi
提出了一种新型的部分反射面（PRS）天线，它可以通过电子方式在线性极化、左旋圆极化和右旋圆极化之间改变其极化状态。该天线由一个短接环形贴片天线作为源，一个PRS结构，以提高增益，和一个可重构的威尔金森功分器作为馈电网络。四个p-i-n二极管插入到功率分配器的每个分支中以改变其电长度。通过接通和关断p-i-n二极管，可以在馈电网络的两个输出端口处实现0度、90度或-90度的相位差，因此使得天线能够辐射线性极化信号或左/右手圆极化信号。设计、制作并测量了一个具有偏置网络的原型天线。模拟结果与实测结果吻合较好。测量结果表明，该天线具有4.7-5.36 GHz（13.1%）的10 dB重叠阻抗带宽和3 dB轴比带宽。平均实现增益类似于9 dBi/dBic，对于不同的偏振保持相当稳定。该天线具有较宽的带宽和相对较高的增益，优于大多数已报道的极化可重构天线。
A novel partially reflective surface (PRS) antenna is proposed, which can electronically alter its polarization between linear polarization, left-hand circular polarization (CP), and right-hand CP. The antenna consists of a shorted annular patch antenna as the source, a PRS structure to enhance the gain, and a reconfigurable Wilkinson power divider as the feed network. Four p-i-n diodes are inserted into each branch of the power divider to change its electrical length. By switching the p-i-n diodes ON and OFF, a phase difference of 0 degrees, 90 degrees, or -90 degrees can be realized at the two output ports of the feed network, hence enabling the antenna to radiate either a linearly polarized signal or left/right-handed circularly polarized signal. A prototype antenna with the biasing network is designed, fabricated, and measured. Good agreement between the simulated and measured results is achieved. Measurement results show that the proposed antenna has an overlapped 10-dB impedance bandwidth and 3-dB axial-ratio bandwidth of 4.7-5.36 GHz (13.1%). The average realized gains are similar to 9 dBi/dBic, which remain reasonably stable for different polarizations. The proposed antenna outperforms most of the reported polarization reconfigurable antennas for its wide bandwidth and relatively high gain.