Design of Cavity Backed Slot Array Antenna for Radar Applications

This paper describes the design of a Cavity Backed Slot Array Antenna (CBSA) for Radar applications. The antenna array is required to operate in the X-band and to form a very low side lobe (Average SLL <-35dB), HPBW 1.9 deg in the Az plane and minimum 26dBi gain over the whole frequency band of 400MHz (4% bandwidth). The main objective of this work is to enhance the impedance and pattern bandwidth and gain of the array antenna. The proposed antenna has been designed and optimised for its electrical performance and dimensions by 3D EM solvers. To meet all the functional and mechanical requirements, an antenna leads to a linear array of a total of 96 radiating elements.