连续相位变化毫米波衍射天线

Millimeter wave diffraction antenna based on continuous phase correction

基于菲涅尔原理及卡塞格伦天线设计方法,设计了一种口面直径为200mm的卡赛格伦菲涅耳相位修正平面天线。天线采用连续相位修正方式,由一组同心菲涅耳相位修正圆环组成,与传统卡赛格伦抛物面天线相比,该天线具有平面化结构,大大减小了天线自身重量,天线辐射性能较离散相位衍射天线有大幅度提高。在95GHz频率下,采用物理光学法进行仿真计算,并采用近场扫描系统进行了天线性能测试,天线3dB波束宽度分别为0.95°及1.05°,天线实测增益为44.1dB,天线口面效率为65%。

A Cassegrain phase-correcting Fresnel zone plate antenna has been designed based on the Fresnel principle and the Cassegrain antenna design method.It consists of a suite of Fresnel zone continuous phase correcting concentric rings,and its diameter of aperture is 200 mm.Compared with the traditional paraboloid antenna,the Cassegrain Fresnel zone plate antenna has a flat and light structure.It precedes the discrete phase diffraction antenna in radiation performance.The simulation has been performed based on the physical optics method,and the test has been performed with the near-field scanning system.The test shows that,at 95 GHz the antenna has an efficiency of 65%.Its 3 dB beam widths are 0.95° and 1.05°,and its gain is 44.1 dB.