A new microstrip fed-slot array antenna for secondary surveillance radar

摘要

This paper presents analysis and design of a new planar slot array antenna with reduced back radiation for secondary surveillance Radar (SSR) application. Feed network for sum and difference beams with hybrid phase shifter and branch line coupler are implemented. A backfill antenna is designed and used to improve coverage of difference pattern in back of antenna. The effects of vital parameters on antenna performance and some other details are analyzed and discussed as well. The proposed antenna, is designed on standard RO4003 substrate with 0.8mm thickness. This antenna fed by microstrip corporate feed network. The fundamental parameters of the antenna such as bandwidth, return loss, gain, and radiation pattern are obtained. The antenna operates in frequencies of 1.03GHz and 1.09GHz with the gain of about 16.5dB for the sum pattern with 3dB beam width of 10.5 ° in azimuth and 65 ° in elevation plane. The proposed antenna has better than 12dB return loss in frequency range. Moreover, the physical size of the antenna is 1.85 × 0.55 × 0.08m3.