In this paper, the design of a broadband modified-circle-shape patch antenna with H-aperture feeding is presented, to be used as single radiating element in the array of the surveillance channel of an UHF passive radar. Different techniques are proposed to achieve a relative bandwidth of more than 30%, and challenging radiation pattern characteristics for the defined application. The achievement of these requirements is proved through measurements in anechoic chamber. A NULA is designed using optimization techniques and considering coupling effects between elements. The NULA was integrated in IDEPAR, the passive radar demonstrator developed in the University of Alcalá, and validated through measurement campaigns. Results prove a significant improvement of the passive radar target detection and bearing estimation capabilities.

本文提出了一种带H孔馈电的宽带圆形修正贴片天线的设计，将其作为UHF无源雷达监视信道阵列中的单个辐射元件。提出了不同的技术以实现超过30％的相对带宽，并为定义的应用提供了具有挑战性的辐射图特性。通过在消声室中进行测量可以证明达到了这些要求。使用优化技术并考虑元素之间的耦合效应来设计NULA。NULA被集成在IDEPAR中，IDEPAR是由阿尔卡拉大学开发的无源雷达演示器，并通过测量活动进行了验证。结果证明了无源雷达目标检测和方位估计能力的显着提高。