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超宽带天线是宽带电子系统中的关键部件。本文开展了折叠缝隙对数周期天线的电磁仿真和性能实验研究。根据对数周期偶极子天线的基本原理,设计了共面波导馈电的折叠缝隙对数周期天线。采用在折叠缝隙对数周期天线的折叠缝隙单元中加载相位槽的方法,进一步改善了天线低频端的驻波特性。对相位槽加载的折叠缝隙对数周期天线进行加工测试,测试结果表明在2 GHz~18 GHz的阻抗带宽内,驻波比小于3.5,与仿真结果吻合良好。设计了基于相位槽加载的共形LPFSA,给出了具体的仿真结果。本文的研究工作为该天线的实际应用提供了技术参考。
Ultra-wideband antennas are key components in broadband electronic systems. In this paper, electromagnetic simulation and performance experiment of logarithmic periodical folded antenna are carried out. According to the basic principle of logarithmic periodic dipole antenna, a coplanar waveguide fed folded logarithmic periodic antenna is designed. The method of loading the phase slot into the folded slot unit of the logarithmic period antenna of the folded slot further improves the standing wave characteristics at the low frequency end of the antenna. The experimental results show that the VSWR is less than 3.5 within the impedance bandwidth of 2 GHz to 18 GHz, which is in good agreement with the simulation results. The conformal LPFSA based on phase slot loading is designed and the simulation results are given. The research work in this paper provides a technical reference for the practical application of the antenna.