一种加载超表面结构的宽带天线设计

A Wideband Antenna by Loading Metasurface Structure

文中通过加载超表面(Metasurface,MTS)的方式设计了一款超表面的宽带微带天线,将传统的矩形辐射贴片替换成超表面结构,提高了微带天线的电性能。天线通过共面波导的阶梯型孔径馈电。超表面印刷在介质板顶面,而介质板底面为共面波导馈电电路,从而增加了超表面与底层馈电孔径之间的耦合。超表面和阶梯型的孔径共同作用,使天线获得了较宽的阻抗带宽。文中设计的天线结构简单,外形紧凑。该天线的-10 dB相对阻抗带宽约为56.4%(7~12.5 GHz),覆盖整个X波段,主辐射方向偏离法向30°。实验测试结果与仿真结果吻合较好,为军事领域中的侦查和探测以及超宽带短距离室内定位中的天线设计提供了思路。

In this paper, a kind of broadband microstrip antennas is designed by loading metasurface(Metasurface, MTS). Replacing the traditional rectangular radiation patch with the metasurface structure, the electrical properties is improved. The antenna is fed through a stepped aperture of a coplanar waveguide. The metasurface is printed on the top of the dielectric plate, and the coplanar waveguide feed circuit is on the bottom. The combination of electrical performance metasurface and stepped aperture makes the antenna obtain a wide impedance bandwidth. The antenna proposed in this paper is simple in structure and compact in appearance. The-10 dB relative impedance bandwidth of the proposed antenna is about 56.4%(7~12.5 GHz), covering the full X-band, and the main radiation direction deviated from the normal direction is about 30°. The experimental test results are in good agreement with the simulated design results. It provides ideas for reconnaissance and detection in military field and antenna design in UWB short-range indoor positioning.