曲面频选天线罩电性能设计研究

针对现如今频率选择表面(FSS)普遍基于平板进行理论研究的现状,提出了一种基于HFSS-Matlab创建曲面频率选择表面的方法。设计了平板频选单元及A夹层平板天线罩,并进行了仿真分析;采用该方法将准周期排列的曲面频选单元附于A 夹层正切卵形介质天线罩表面。为了验证曲面频选的性能,选用宽波束的平面螺旋天线作为激励,对曲面频选天线罩天线系统进行了联合仿真,并分析了加载曲面频选结构对天线罩电性能的影响。结果表明,所设计的曲面频选结构与平板FSS结构电磁性能基本保持一致,实现了曲面FSS 频率选择的功能,在传输段内不仅能够满足天线罩电性能设计指标要求,而且能有效降低天线带内强镜面反射(RCS),对曲面频选天线罩的实际工程应用具有指导意义。

An Electromagnetic Performance Analysis and Design of Curved Frequency Selective Surface (C-FSS) Radome

Currently, frequency selective surface (FSS) is generally based on the theoretical research of flat plane. In this paper, a novel method of creating curved frequency selective surface (C-FSS) based on HFSS-Matlab simulation software is proposed. The flat plane frequency selective unit (FSU) and the A-shape sandwich sheet radome are designed, and the simulation analysis is carried out. Besides, the quasi-periodic array (QPA) FSU is attached to the surface of the A-shape intersecting tangent oval dielectric radome. In order to verify the performance of the FSS, the plane spiral antenna with wide beam is selected as the excitation, and the joint simulation of the C-FSS radome and antenna system is carried out. The influence of the frequency selective structure of the loaded surface is analyzed through the electromagnetic performance of the radome. The result shows that the designed C-FSS basically fits the electromagnetic performance of the flat FSS structure, and realizes the function of FSS. The transmission part not only meet the requirements of the electromagnetic performance design of the radome, but also effectively reduces the Radar Cross Section (RCS) in the antenna strap. The practical engineering application is leading towards the broad significance.