采用非均匀特异媒质覆层，设计了一种具有高增益特性的新型谐振腔天线。该谐振腔天线采用矩形微带贴片天线作为辐射单元，安装在金属谐振腔内，其谐振频率为 10 GHz。为提高天线增益，将腔表面安装蚀刻在微带基板上，由周期性单元组成特异媒质覆层。迥异于常规的单元尺寸均匀一致特异媒质覆层，本文研制的非均匀特异媒质覆层包含 9×9个矩形单元，单元大小渐变。仿真表明，与常规均匀特异媒质覆层相比，该新颖的非均匀特异媒质覆层相当大程度提升了天线定向辐射性能：天线增益提高 1.2 dB(从 20.3 dBi增加到 21.5 dBi)，天线的旁瓣得到了抑制，主旁瓣比下降 5 dB；同时，天线谐振频率和阻抗带宽等其他性能基本保持不变。

A Resonant Cavity Antenna(RCA) with a non-uniform metamaterial superstrate is proposed. A rectangular patch antenna, working at 10 GHz, is placed in a cavity as a primary source. A superstrate printed with square metal patches is placed in front of the antenna in order to increase the gain. Different from normal uniform metamaterial superstrate, the proposed structure consists of 9×9 units with different sizes. Simulation results demonstrate that the directivity of non-uniform metamaterial superstrate RCA increases by 1.2 dB(from 20.3 dBi to 21.5 dBi), and the side lobe is suppressed(the main-to-sidelobe ratio decreases by 5 dB), while the other properties like antenna resonant frequency and impedance bandwidth remain unchanged almost.