摘要
设计了一种应用于雷达系统中的低成本低副瓣阵列天线,该天线阵包含256个辐射单元,由四个64单元的子阵组成,采用波导合成网络进行功率合成.天线单元采用空气同轴馈电的角锥喇叭,空气同轴馈线内外导体呈方型结构,其终端为短路馈电方式,实现了内导体的自支撑设计和较低的传输损耗,并依据综合幅度分布采用若干数量的不等功分器进行低副瓣设计.测试结果表明,小于2的驻波带宽为0.5GHz,相对带宽为7.5%.另外,中心频率的增益为30dB,增益大于29.5dB的带宽为0.2GHz,E面和H面的旁瓣电平为28.5dB和29dB.
A low sidelobe array antenna is investigated to provide a low-cost and effective solution to radar applications.This antenna array consists of 256 radiating elements divided into four subgroups of 64 elements each,and fed by a rectangular waveguide feed network.The feed structure of the proposed radiation element,which is basically a novel air coaxial-fed pyramidal horn array with shorting termination,can be realized by self-supporting feedline network and with low losses.Low sidelobe design is conducted according to the synthesized amplitude distributions with a number of unequal power dividers.The test results show that measured impedance bandwidth for voltage standing wave ratio（VSWR）less than 2is within 0.5GHz,with a relative bandwidth of 7.5%;the measured gain is 30 dB at the center frequency,while it is higher than 29.5dB at a frequency band of 0.2GHz;the measured sidelobe level is 28 dB in the E-plane and 29.5dB in the H-plane.
出处
《电波科学学报》
EI
CSCD
北大核心
2016年第3期573-578,596,共7页
Chinese Journal of Radio Science
关键词
雷达应用
角锥喇叭
空气同轴线
低旁瓣
radar application
pyramidal horn
air coaxial feedline
low sidelobe
