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A SIW Based Microstrip Patch Antenna Array in X-Band for Phased Array Radar Applications

This paper presents analysis and design of substrate integrated waveguide (SIW) based microstrip patch antenna array using FEM based solver. It emulates the performance of a cavity backed patch antenna array and helps in designing a wide band wide scan antenna array. It helps in realization of a low profile antenna structure free from surface waves to a larger extent by getting rid of bulky and fabrication intensive metallic cavities required conventionally to inhibit surface wave propagation in substrate to remove scan blindness in phased arrays. The antenna shows a bandwidth of around 500MHz in X-band with 3dB beamwidth >90°. It also shows an 16 x 16 array performance. The work finds application in phased array radars.