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提出来一种应用于直升机防撞雷达的高口面效率W波段单脉冲双反射面卡塞格伦天线.口面分析方法的提出解决了W波段反射面天线口面相位分布不均匀的缺陷,从而有效地提高了口面的利用效率.利用该方法,本文研究并制作了口径为135 mm、焦距为40.5 mm的W波段卡赛格伦天线,并且设计了由四个E面多缝隙电桥和四个四分之一波导波长延迟线级联构成的和差网络.经测试,该单脉冲天线在93 GHz具有38.6 dBi的和波束增益,相应的口面效率为54.7%;差波束的零深优于-22 dB,副瓣电平小于-18 dB.测试结果与基于口面分析方法的仿真结果吻合,从而证明了本文所研究天线可以应用于高口面效率的W波段单脉冲系统中.
A high-efficiency W-band monopulse double-reflection Cassegrain antenna with high efficiency and high efficiency for helicopter collision avoidance radar is proposed.Analytical method of the face-to-face method solves the defect that the phase distribution of the antenna face in the W-band reflector is not uniform, Thus effectively improving the efficiency of the utilization of the mouth surface.With this method, a W-band CassGrand antenna with a diameter of 135 mm and a focal length of 40.5 mm has been researched and fabricated, and four E-face multi-gap bridges And four quarter-wave wavelength delay line cascades.It was tested that the monopulse antenna has a beam gain of 38.6 dBi at 93 GHz with a corresponding mouth-area efficiency of 54.7% and a zero Depth better than -22 dB and sidelobe level less than -18 dB.The test results are in good agreement with the simulation results based on the face-to-face analysis method, which proves that the antenna studied in this paper can be applied to the W-band single pulse system with high efficiency .