volume | PIER Journals

Abstract

This paper proposes a multistep reflector backing for compact spiral antennas to provide a consistent unidirectional pattern over a wide frequency band with improved gain, Axial Ratio (AR), and efficiency for 2-18 GHz applications. The effect of the variation of step number and step sizes of the reflector on antenna parameters has also been studied in the proposed work. The fabricated prototype antenna provides good impedance matching and circular polarization over the entire frequency range and is compact in size with a height of 0.078 wavelengths (λ_m) at lowest frequency. The antenna exhibits a rotating radiation pattern with frequency in azimuth direction providing almost a constant beamwidth of 117° with the variation in gain limited to only 0.75 dBic above 8 GHz, yielding a flat gain response at higher frequencies. The compact size and improved parameters of the designed wideband antenna with a stepped reflector makes it a suitable candidate for electronic warfare applications.

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Mr. Abhay Madhukar Morey

Dr. Avinash R. Vaidya

Mr. Sandeepak S. Kakatkar