基于口面场方法的W波段高口面效率单脉冲卡塞格伦天线（英文）  

W- band high aperture efficiency monopulse Cassegrain antenna based on aperture field approach

作　　者：郑沛[1] 赵国强[1] 金城[1] 孙厚军[1] 

机构地区：[1]北京理工大学毫米波与太赫兹系统北京市重点实验室,北京100081

出　　处：《红外与毫米波学报》2015年第6期700-704,共5页Journal of Infrared and Millimeter Waves

基　　金：Supported by National Natural Science Foundation of China(61471040)

摘　　要：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 aperture efficiency W-band Cassegrain dual-reflector monopulse antenna is proposed for helicopter collision avoidance radar applications. Aperture field approach method has been investigated to increase the whole performance of the proposed antenna with unequal phase aperture distribution in W-band. The proposed monopulse antenna integrated with the aperture size of 135 mm and focal length of 40. 5 mm was fabricated. A sumdifference network based on the E-plane branch line bridge was designed to test the antenna. Measured results show that the gain of the antenna is 38. 6 dBi at 93 GHz,corresponding to the aperture efficiency of 54. 7%. In addition,it owns the null-depth better than- 24 dB and the side-lobe below- 18 dB. Measured results are in good agreement with predicted ones. It is demonstrated that the proposed structure is an attentive candidate of high aperture efficiency W-band monopulse antenna.

关 键 词：口面分析方法 卡塞格伦天线 单脉冲 和差网络 W波段 

分 类 号：TN823.27[电子电信—信息与通信工程] TN823.28