This paper presents a planar ultra-wide band (UWB) sensing antenna accompanied with a monopole narrow band communicating antenna for interweave cognitive radio (CR) applications. The UWB antenna bandwidth covers the entire band specified for UWB applications (3.1–10.6 GHz). In addition to the varactor diode, a PIN diode is attached to the communicating antenna to expand the continuous frequency tuning of the varactor diode up to 3 GHz along the frequency range (3.3–6.3 GHz) including WiMAX, personal area network, and the 5 GHz wireless local area network. The UWB sensing antenna shape and the ground plane size of the communicating antenna are modified to reduce the mutual coupling between the two antennas to values less than − 15 dB. The measurements are well agreed with the simulation, and they verify the antenna suitability for CR systems. Moreover, the results show an omnidirectional power pattern for both sensing and communicating antennas which is compatible to the portable CR devices.

中文翻译：

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一种用于交织认知无线电应用的具有连续和宽频率调谐范围的平面集成 UWB/可重构天线

本文介绍了一种用于交织认知无线电 (CR) 应用的平面超宽带 (UWB) 传感天线和单极窄带通信天线。UWB 天线带宽涵盖为 UWB 应用指定的整个频段 (3.1–10.6 GHz)。除了变容二极管之外，通信天线上还连接了一个 PIN 二极管，以将变容二极管的连续频率调谐扩展到 3 GHz 沿频率范围 (3.3–6.3 GHz)，包括 WiMAX、个人区域网络和 5 GHz 无线局域网。UWB 感应天线形状和通信天线的接地平面尺寸经过修改，以将两个天线之间的相互耦合降低到小于 − 15 dB 的值。测量结果与模拟非常吻合，它们验证了 CR 系统的天线适用性。