X波段高功率宽频带双螺旋反射阵列天线的设计

Design of X-band high power wideband dual-helical reflectarray antenna

为了提升高功率微波辐射天线的带宽,提出并设计了一种X波段高功率圆极化反射阵列天线,该天线采用喇叭天线作为馈源,阵列天线单元由可旋转金属双螺旋线构成,通过旋转螺旋线可以实现360°的相位补偿,同时反射损耗极小。设计了15×15矩形栅格螺旋反射阵列天线,全波仿真结果表明:该口径为315 mm的阵列天线在中心频点9.3 GHz下,增益为28 dB,轴比为0.53 dB,口径效率为52.6%;在8.5~10.9 GHz的频带范围内增益大于26.8 dB,轴比小于1.14 dB,1 dB增益带宽和40%以上口径效率带宽均大于21%;在真空中所能承受的最大功率约为207 MW。

In order to broaden the bandwidth of high power microwave radiation antenna,an X-band high power circularly polarized reflectarray antenna constructed by mechanically rotational helical elements is proposed and investigated.The array antenna is fed by an X-band left-handed circularly polarization circular horn.The variable rotation of helical element enables full 360°phase adjustment with low reflection loss.The rectangular reflectarray antenna of 225-element is put forward and simulated.Full-wave simulation result shows that at 9.3 GHz,the antenna gain is 28 dB,the antenna axial ratio is 0.53 dB and the aperture efficiency is 52.6%.In the range of 8.5 to 10.9 GHz,the gain is over 26.8 dB,the axial ratio is below 1.14 dB,and both the 1-dB gain bandwidth and the 40%aperture efficiency bandwidth are over 21%.The power handling capacity of the reflectarray antenna is found to be 207 MW in vacuum.