高功率双层径向线螺旋阵列天线理论分析与数值模拟

研究了一种高功率双层径向线螺旋阵列天线.论文首先介绍该阵列天线的工作原理,然后从工作原理出发,设计中心频率为4.0 GHz的高功率双层径向线螺旋阵列天线,提出并研究了螺旋单元天线的磁耦合馈电,最后用有限元算法软件对阵列天线进行了数值模拟.模拟结果表明:该口径为320mm的天线在中心频率上可获得21.13dBi的增益,口径效率可达72.3％,在-12°≤θ≤12°的范围内轴向轴比值小于1.55;在3.8GHz~4.2GHz的频率范围内增益大于20.68dBi,口径效率大于69%,天线轴向轴比值小于1.7.

Theoretical Analysis and Numerical Simulation of a High Power Helical Array Antenna Fed from Double-Layer Radial Waveguide

This paper describes a new antenna to realize the directional radiation of high-power microwave-helical array antenna fed from double-layer radial waveguide.The feed wire of each helix is connected with an H-coupled probe inserted into a radial waveguide,and excited by a TEM wave between the two parallel plates of the waveguide.Helices and probes are arranged on the upper plate to form a circular array.This antenna accepts directly an azimuthally symmetric output of a HPM source and radiates a high-gain pattern with a boresight peak.The use of H-coupled probes makes the array antenna compatible with the intense electric fields associated with high-power microwave sources.In addition,the array antenna has a simple structure and can project circular polarized electric field.In this paper,the fundamental theory of function is presented;an array antenna for a frequency band of 3.8GHz to 4.2GHz is designed and simulated.At 4.0GHz,the calculated aperture efficiency shows a high value of 72.3% and the axial ratio value at the normal direction is of 1.55.In the range of 3.8GHz to 4.2GHz,the aperture efficiency is over 69% and the axial ratio is below 1.7.