一种地铁数字集群系统新型天线的设计及其性能仿真

Design and Performance Simulation of a New Type of Antenna in Subway Digital Trunk System

为了优化地铁数字集群系统无线通信天线的辐射性能,提高地铁的调度效率,结合微带天线和八木天线原理,提出了一种基于层叠结构的微带圆盘八木天线.模拟仿真的结果表明,该型天线的电压驻波比为1.33,输入阻抗为47.54Ω,最大增益2.53dB.与传统TETRA杆状天线相比,体积缩小了6.4倍,驻波比下降了1.88倍,输入阻抗提高了2.38倍,增益提高26%.同时,分析了该天线的抗干扰能力.

In order to optimize the radiation performance of system antenna in subway.This study proposed the stacked yagi-uda antennas based on the principle of microstrip antenna and yagi antenna.The simulated results show that the voltage standing wave ratio（VSWR）of antenna is1.33,input impedance is 47.54Ω,and the biggest gain is 2.53 dB.Compared to the traditional antenna,the volume decreases by 6.4 times,the VSWR declines by 1.88 times,the input impedance enhances by 2.38 times and radiation efficiency improves by 26%.Meanwhile,the paper analyzed the anti-interference ability of antenna.