一种Ka频段宽带宽角扫描微带天线

Design of a Ka-band wide-band wide-scanning microstrip antenna

摘要:

针对低剖面微带天线带宽窄的问题，设计了一种高度仅为0.11λ0的双层贴片开槽微带天线，通过双贴片同时馈电的方式，展宽了微带天线的带宽，实现了驻波带宽达到17.9%。经过HFSS（High Frequency Structure Simulator，高频结构仿真器）设计仿真结果表明：该天线单元具有良好的阻抗匹配特性，驻波带宽在17.9%，增益为5.89 dB，符合宽带天线的标准。将该天线单元组成6×6阵列，通过仿真分析得出，天线在31.0 GHz~36.5 GHz频带范围内VSWR（电压驻波比）≤2，相对带宽达到16.4%，增益达到20.28 dB，-60°~60°扫描范围内具有良好辐射特性。该天线具有小型化、易于集成、制造简单等优点，可用于多种通信系统中，应用前景良好。

Abstract:

In order to solve the problem of narrow band width of low profile microstrip antenna, a two-layer patch slotted microstrip antenna with a height of only 0.11 λ0 is designed. By feeding two patches simultaneously, the bandwidth of the microstrip antenna is widened, and the standing wave bandwidth reaches 17.9%. The simulation results of HFSS design show that the antenna unit has good impedance matching characteristics, the standing wave bandwidth is 17.9%, and the gain is 5.89 dB, which meets the standard of broadband antenna. The antenna unit is composed of 6×6 array. Through simulation analysis, it is found that the antenna has VSWR≤2 in the band range of 31.0 GHz~36.5 GHz, the relative bandwidth is 16.4%, the gain is 20.28 dB, and the antenna has good radiation characteristics in the scanning range of -60°~60°. The antenna has the advantages of miniaturization, easy integration and simple manufacture. It can be used in a variety of communication systems and has a good application prospect.