宽频带四脊喇叭研究

Study on Broadband Quad-ridged Horn

研究并设计了一种宽频带、双极化的圆四脊喇叭。利用CST仿真软件分析了四脊喇叭的背部腔体和脊曲线分别对电压驻波比和波束宽度的影响,采用台阶形状的背腔可有效地改善四脊喇叭的驻波特性;脊曲线斜率变化越快,辐射方向图的10dB波束宽度越宽。最后,设计并仿真了一个2-12 GHz的四脊喇叭馈源,电压驻波比小于2,两端口的隔离度小于-45dB,辐射方向图良好。

In this paper,the broadband dual-polarized quad-ridged horn is studied and designed. The effect of the back cavity and curve of the ridges on voltage standing wave ratio（ VSWR） and beamwidth is analyzed by CST simulation software. The results show that the VSWR can be reduced by introducing a step shape back cavity; and the faster the slope of ridge curve changes,the wider beamwidth（ 10 dB） of radiation pattern. Finally,the feed of a 2 - 12 GHz dual-polarized quad-ridge horn is designed and simulated. The simulated results show that the radiation pattern is good when VSWR is below 2 and the port isolation is less than- 45 dB.