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《Chinese Journal of Radio Science》 2016-03
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A low sidelobe planar X-band antenna array with air coaxial feedline

SONG Changhong;WU Qun;The 54th Research Institute of CETC;China Department of Electronic and Communications Engineering,Haerbin Institute of Technology;  
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.
【CateGory Index】: TN820.15
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