volume | PIER Journals

Abstract

This manuscript describes the design of a scannable Cosecant² Shaped Pattern Generating Phased Array Antenna (PAA) intended for airborne synthetic aperture radar (SAR). The Cosecant² Shape avoids the requirement of sensitivity time control correction at receiver side. A C-band linear array antenna consisting of 16 elements is designed, analyzed, developed, and characterized. The array antenna is embedded with a U-slot and Defected Ground Structure (DGS) integrated microstrip elements. The introduction of a DGS provides an improvement of 6.5 dB in cross-polarization levels when scanning. Additionally, the null perturbation technique is employed to synthesize the excitation coefficients for the Cosecant²-Shaped pattern, aiming to achieve the minimum current taper ratio. These synthesized coefficients are combined with a progressive phase for beams that can scan within a ±30° angular range. The proposed linear array, along with its excitation and phasing network, has also been developed and characterized in an anechoic chamber.

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Dr. Rajeev Jyoti

Dr. Amalendu Patnaik

Mr. Gaurav Kumar

Dr. Pratik Mevada

Mr. Gaurav Ahuja