Radiation Pattern Analysis of Frequency Diverse Array Based on Square Frequency Modulated Continuous Wave

According to high costs of phase shifters in antenna arrays, new methods for beam steeringwithout phase shifter are introduced. Frequency Diverse Array (FDA) concept is another approach to beam steering problem. In this structure, the subsequent antenna elements are fed with stepped discrete frequencies causing continuous scanning of space in time. So a range-angle dependent scanning is made possible. There are several ways to implement, which the simplest of them is using Linear Frequency Modulated Continuous Wave (LFMCW) source. In this paper, a new implementation scheme is proposed and analyzed where a Square Frequency Modulated Continuous Wave (SFMCW) source is used for feeding a special beam forming network. Also radiation pattern of SFMCW and LFMCW was compared.