基于矩量法仿真的笼形天线宽带化设计

Simulation Design of Broadband Cage-Antenna Based on the Method of Moments

笼形天线是广泛应用的一种短波天线,但其带宽不能满足目前宽频带通信的要求,针对笼形天线的特点,采用折合、加载的方法对笼形天线进行宽带化设计。以一副实际天线为对象,采用矩量法对预选的两种设计方案分别进行仿真计算和比较,根据比较结果选取其中一个方案并进行改进,同时对加载电阻阻值进行优化计算。实际天线的测试结果与仿真结果一致。改造后的笼形天线在整个短波波段（3~30MHz）95%以上频率点驻波比≤3,适合于与宽带电台连接使用。

Cage - antenna is a widely used HF antenna, but it can＇t meet the requirement of broadband communication. In this paper, folding and loading technologies are used to widen the bandwidth of cage - antenna. Two schemes are designed for a real cage - antenna. Their performances are simulated using the method of moments. According to the simulation results, an improved scheme is adopted and its loading parameter is optimized. The measured results of the reformed antenna agree well with those from simulation. The VSWR is within 3： 1 over more than 95% of 3 -30 MHz frequency range. The reformed antenna is qualified to connect＇with broadband transmitter.