A simple compact circularly polarized (CP) cross slot antenna with a wide frequency tuning range has been presented in this letter. Four identical varactors are loaded at the ends of the cross slot for varying the operating frequency, and only one voltage is adopted to control the varactors. Distributed inductors and capacitors are employed to realize CP radiation. By varying the value of varactors, a wide tuning frequency range of 41% (1.65–2.5 GHz) is achieved. Stable CP radiation patterns are obtained for all frequencies across the entire operating bandwidth. The proposed antenna is a good radiator that can be used for Internet of Things (IoT) wireless sensing network, WiFi applications, and reconfigurable array developments.

中文翻译：

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具有频率重配置功能的紧凑型双模圆极化天线


这封信中介绍了一种具有宽频率调谐范围的简单紧凑型圆极化 (CP) 十字槽天线。在交叉槽的两端加载四个相同的变容二极管来改变工作频率，并且仅采用一种电压来控制变容二极管。采用分布式电感和电容来实现CP辐射。通过改变变容二极管的值，可以实现 41% (1.65–2.5 GHz) 的宽调谐频率范围。在整个工作带宽内的所有频率都可以获得稳定的 CP 辐射方向图。所提出的天线是一种良好的辐射器，可用于物联网 (IoT) 无线传感网络、WiFi 应用和可重构阵列开发。