In this paper, a reconfigurable circular-ring feed patch antenna for polarization diversity applications is proposed. The reconfigurability is realized by using only two p-i-n diodes which are inserted into the circular feed ring of the aperture-coupled patch antenna. With the help of the p-i-n diodes, the polarization of the antenna is able to be altered among 45° linearly polarized (LP), left-hand circularly polarized (LHCP), and right-hand circularly polarized (RHCP) states. A fully-functional prototype is fabricated and measured. The measurement agrees well with the simulation and three polarization states are obtained. Owing to the merits of tri-polarization diversity, low profile and simple structure, the proposed design is a great candidate for future wireless systems.

在本文中，提出了一种用于极化分集应用的可重构圆环馈电贴片天线。可重构性是通过仅使用插入孔径耦合贴片天线的圆形馈电环中的两个 pin 二极管来实现的。在 pin 二极管的帮助下，天线的极化可以在 45° 线性极化 (LP)、左手圆极化 (LHCP) 和右手圆极化 (RHCP) 状态之间改变。一个功能齐全的原型被制造和测量。测量结果与模拟非常吻合，并获得了三个偏振态。由于三极化分集、低剖面和结构简单的优点，所提出的设计是未来无线系统的一个很好的候选者。