X波段空中辐射场测量中的天线设计与应用

Antenna Design and Application in X-Band Airborne Radiation Measurement

为减小空中微波辐射场测量时极化失配带来的影响,设计了一种低轴比微带圆极化阵列天线,该天线在9.7 GHz,3 dB波束宽度约45°,轴比低至0.1 dB。天线功率容量大于1.5 kW,常温(26℃)和低温(-6℃)时天线轴比偏差小于0.1 dB。应用该天线可以将极化失配不确定度减小到0.1 dB以内,并具有较强的环境适应性,适用于X波段空中辐射场精确测量。

A microstrip circularly polarized array antenna with low axial ratio was designed to decrease the measurement uncertainty caused by polarization mismatch.The 3 dB beam width of the antenna was about 45°at 9.7 GHz,the axial ratio was as low as 0.1 dB at 9.7 GHz.The antenna power capacity was greater than 1.5 kW,and the axial ratio deviation was less than 0.1 dB between temperature of 26℃and-6℃.With this antenna,the uncertainty of polarization mismatch can be reduced to less than 0.1 dB.It has strong environmental adaptability and it is suitable for accurate measurement of X-band airborne radiation field.