74GHz毫米波透镜喇叭天线的设计与仿真

Design and simulation of 74 GHz millimeter wave lens horn antenna

设计了一种应用于毫米波段的透镜喇叭天线,基于几何光学的原理建立透镜和喇叭之间的几何关系,减少了独立的设计变量,并对天线进行了仿真.结果表明：当天线的中心频率为74 GHz时,天线的口径为38.63 mm;在72.5~76 GHz频带范围内,带内电压驻波比VSWR均小于1.5,天线增益大于28 dB,并且E面和H面中的半功率波束宽度分别小于6.5o和8.5o.喇叭天线在加载介质透镜前后三维方向图的仿真结果表明介质透镜可以减小喇叭口面相位误差.所设计的天线具有良好的方向性和增益.

A lens horn antenna applying to millimeter wave band was designed. Based on geometric optical principle, the geometric relation between the lens and the horn was created, so the independent design variables were reduced and then antenna was simulated with simulation software. The results show that when the center frequency of the antenna is 74 GHz, the aperture of the antenna is 38.63 mm. The VSWR of the antenna is less than 1.5, the gain is more than 28 dB, and the half-power beam width is less than 6.5o and 8.5o in E-plane and H-plane respectively in the frequency ranges from 72.5 GHz to 76 GHz. The simulated results of 3D patterns obtained from the horn antenna with or without a dielectric lens prove that the dielectric lens can reduce the phase error in the aperture. The antenna has a good directivity and a high gain.