This paper demonstrates a completely new technique to obtain high-selective filtering response of a rectangular dielectric resonator antenna (DRA). The proposed filtering antenna mainly composed of a rectangular DRA driven by a stair shaped slot on the ground plane and a feed line with multiple bandstop characteristics. Two pairs of band-rejection resonators with dissimilar resonant frequencies is integrated in the 50 Ohm microstrip line to generate four transmission zeros on either side of passband which offers the filtering response for the rectangular DRA. Just by inserting two identical pair of band-rejection resonators in feed below the ground plane, the proposed DRA exhibits a consistent broadside gain response in passband with skirt selectivity at both upper and lower band-edge with four radiation nulls. Three distinct resonance frequencies of TE111 mode are excited in close proximity within the DRA due to the different loading effect of band-rejection resonators in the feed, enhancing the operating bandwidth of antenna to 11.8%.

本文演示了一种获得矩形电介质谐振器天线（DRA）的高选择性滤波响应的全新技术。提出的滤波天线主要由矩形DRA组成，该矩形DRA由接地平面上的阶梯形槽驱动，并具有多个带阻特性的馈线。两对具有不同谐振频率的带阻谐振器集成在50欧姆微带线中，以在通带的任一侧生成四个传输零点，从而为矩形DRA提供滤波响应。仅通过在接地平面以下的馈源中插入两对相同的带阻谐振器，所提出的DRA就可以在通带中表现出一致的宽边增益响应，并且在上下两个频带边缘都具有裙边选择性，并具有四个辐射零点。