超宽带双极化喇叭天线仿真设计

Simulation Design of Ultra-Wideband Dual-Polarized Horn Antenna

宽带喇叭天线在EMC测量、雷达和通信系统上有广泛的应用价值,但在实际应用中常存在天线倍频程不够、高频方向图出现分裂等不足。针对上述问题设计了一种工作频段为1~18 GHz的圆口径、双极化喇叭天线,采用双端口馈电的两对加脊圆形波导为基本结构,通过对基于三阶贝塞尔曲线形式的四脊天线辐射单元以及锥形反射腔的优化设计,达到了18∶1倍频程内天线驻波比小于2,隔离度大于30 dB的设计指标,天线方向图在全频段内无裂瓣现象,实现了良好的辐射特性。

Broadband horn antennas have a wide range of application values in EMC measurement,radar and communication systems,but in practical applications,there are often problems such as insufficient antenna octaves and splitting of high-frequency patterns.Aiming at the above problems,a circular aperture,dual-polarized horn antenna with a working frequency band of 1-18 GHz is designed.Two pairs of circular waveguides with ridges fed by dual ports are used as the basic structure.The optimized de⁃sign of the four-ridged antenna radiating element and the conical reflective cavity has achieved the design index of the antenna standing wave ratio less than 2 and the isolation degree greater than 30dB in the 18∶1 octave band,and the antenna pattern has no split lobe phenomenon in the whole frequency band.,achieving good radiation characteristics.