一种新型圆极化高功率微波天线

A Novel Circularly-Polarized High-Power Microwave Antenna

介绍了一种新型圆极化高功率微波天线,可辐射高功率微波源所产生的 TEM 或 TM_(01)模。该天线由同轴插板式模式转换器和一种新型同轴插板式喇叭组成,模式转换器将输入的同轴 TEM 模转换为4个相位依次相差90°的扇形波导 TE_(11)模,并通过新型喇叭辐射,在轴向上获得了圆极化辐射场。优化设计了一个中心频率为4GHz 的天线,其总长度为385mm,喇叭口径320mm。在中心频率上天线增益为19.3dBi,轴比1.06,反射损耗-20dB。在 3.8～4.2GHz 的频率范围内增益大于18.9dBi,反射损耗小于-10dB。

A novel circularly-polarized high power microwave （HPM） antenna is presented, which can directly radiate the coaxial TEM mode or circular TM01 mode from high-power microwave sources. The antenna is composed of a coaxial fininserted mode converter and a coaxial fin-inserted horn. The coaxial TEM mode is converted to four sector TE11 modes with 90° phase-difference between two neighbor ports, and radiated by the horn. An antenna for 4GHz is designed with the length of 385mm and the aperture diameter of 320mm. The calculated results show that it has a gain of 19.3dBi at 4GHz with AR = 1.06 and return loss = -20dB, its gain exceeds 18.9dBi and its return loss is below - 10dB in the range of 3.8 -4.2GHz.