Design and analysis performance of a new patch array antenna for SSR

This paper presents analysis and design of a new microstrip patch array antenna with reduced back radiation for secondary surveillance radar (SSR) application. This antenna fed by microstrip corporate feed network. Feed network for sum and difference beams with hybrid phase shifter and branch line coupler are implemented. Also 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 0.812 mm thickness. The fundamental parameters of the antenna such as bandwidth, return loss, gain, and radiation pattern are obtained. The antenna operates at frequencies of 1.03GHz and 1.09GHz with about 18dB gain. Beam width of sum pattern is 10.5° and 40° in azimuth and elevation plane, respectively. The proposed antenna has better 12 dB return loss at frequency range. Moreover, the physical size of the antenna is 1.80 χ 0.47 × 0.11 m
³
.