In this article, a reconfigurable antenna with quad‐polarization radiations is proposed based on a switchable feeding network. A wideband quad‐mode feeding network is first designed by integrating a simple impedance converter with a modified hybrid coupler. By switching the p‐i‐n diodes, four‐transmission status with specific amplitudes and phase differences at feeding output ports can be obtained over a wide frequency range, hence enhancing the radiating bandwidth of two linear and two circular polarizations. Finally, a prototype of the proposed quad‐polarization‐agile reconfigurable antenna is designed and fabricated. The measured results show a wide overlapped bandwidth of 782 to 1010 MHz (25.4%) for all four polarizations with a competitive size and gain performance.

中文翻译：

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正交混合集成可重构馈电网络，用于宽带四极化捷变天线设计

在本文中，基于可切换的馈电网络，提出了一种具有四极化辐射的可重构天线。首先通过将简单的阻抗转换器与改进的混合耦合器集成在一起来设计宽带四模馈电网络。通过切换p-i-n二极管，可以在很宽的频率范围内获得在馈送输出端口具有特定幅度和相位差的四传输状态，从而增强了两个线性极化和两个圆形极化的辐射带宽。最后，设计并制造了所提出的四极化捷变可重构天线的原型。测量结果表明，对于所有四个极化而言，它们具有782至1010 MHz（25.4％）的宽重叠带宽，具有具有竞争力的尺寸和增益性能。