volume | PIER Journals

Abstract

A compact spiral antenna is investigated by integrating a modified feed structure with a reflector backing. A significant reduction in antenna height is achieved without affecting performance over the desired frequency band. Experimental results demonstrate a negligible impact on radiation loss, impedance continuity, polarization purity, and bandwidth. The implementation preserves stable impedance matching and maintains circular polarization characteristics across the 2-18 GHz frequency range. The findings validate the practical feasibility of incorporating sharp bends in a tapered balun for spiral antennas. This height reduction facilitates low-profile integration in space-constrained applications without compromising antenna efficiency or radiation quality. The compactness and low-profile configuration make the antenna highly suitable for electronic countermeasure (ECM) applications, including radar warning receivers, missile systems, and EW pods, where size and integration are critical.

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Dr. Abhay Madhukar Morey

Dr. Avinash R. Vaidya

Mr. Sandeepak S. Kakatkar