角锥喇叭天线设计与仿真研究

Study on Design and Simulation of Pyramidal Horn Antenna

为了对工作于Ku频段(12.25～12.75GHz)的低剖面平板天线进行研究,设计一种新型高增益角锥喇叭天线作为其天线单元。为实现天线的双线极化,考虑天线的辐射口面具有结构对称性,将天线的馈电波导设计成方形波导。采用三维电磁仿真软件HFSS (High Frequency Structure Simulator)对角锥喇叭天线进行设计与仿真,并利用软件的优化功能对天线增益进行优化。仿真结果表明:天线在Ku频段内,增益不低于15.4 dB,反射系数优于–21 dB,电压驻波比VSWR(Voltage Standing Wave Ratio)不大于1.19,且方向性在中心处达到最强。所设计的角锥喇叭天线增益高,尺寸小,易实现低剖面平板天线的设计要求。

In order to study the low-profile panel antenna that works in Ku band （12.25-12.75GHz）, a high-gain Pyramidal horn antenna is designed as the unit of low-profile panel antenna. To meet dual polarization, it was taken into account that the radiation aperture of antenna unit has symmetric structure. Thus the feed waveguide is designed into a square waveguide. The proposed antenna is designed, simulated and optimized for antenna gain with HFSS （High Frequency Structure Simulator） software. Simulated results show that： in the Ku band, the reflection coefficient is less than -21dB; and the VSWR （voltage standing wave ratio） is less than 1.19; and the gain is more than 15.4dB; and then the directivity achieves the strongest at the center. Therefore, the designed antenna has high gain and small size, which can meet the design requirements of low-profile panel antenna.