带有EBG反射板的缝隙多层宽带微带阵列天线

A Slot Coupling Stacked Broadband Microstrip Array Antenna with EBG Structures Reflector

宽带微带天线多使用缝隙结构和多层结构,在扩展阻抗带宽的同时天线方向图副瓣与后瓣电平变大,降低了天线性能,限制了应用。小型化金属EBG结构反射板具有高阻抗表面特性,可利用其减小天线厚度提升方向图性能。通过结构设计与优化,相对于普通反射板结构,天线前后比提升了1.29dB,最大副瓣电平降低了3.16dB。天线至反射板的距离也被缩小至14mm(<λ/4),降低了天线剖面。测试结果说明,对于改善多层天线、缝隙耦合天线方向图特性,提升天线前后比,缩小天线厚度这种结构天线非常有效。

Most broadband microstrip antenna are implemented in the form of slot structure or laminate structure. The impedance bandwidth is broadened, but meanwhile the sidelobe of the directivity pattern and backlobe level are enlarged. Therefore the performance is degraded, which confines the application of the microstrip antenna. A broadband stacked slot coupling microstrip antenna array with EBG structure reflector is proposed. The minimized metal EBG reflector possesses a feature of high impedance surface. Compared to the conventional reflector structure, the front-to-back ratio improved 1.29dB, the maximum baeklobe level is reduced by 3.16dB. The distance between the antenna and reflector is shortened to 14mm （ 〈 λ/4）, and the antenna profile is lower. Test results indicate that, the proposed reflector structure can effectively improve the directivity pattern of stacked antenna and aperture coupled antenna, promote the front-to-back ratio, and reduce the thickness of the antenna.