Compact designs of circular microstrip antennas employing modified ground plane for wideband response

Abstract

Wideband Compact designs of circular microstrip antennas by employing modified ground plane profile are proposed. Ground plane slots reduces patch fundamental mode frequency and Bow-tie shape of the same yields wider bandwidth on thinner substrate, thus achieving wider bandwidth with a smaller antenna volume. Optimum results are achieved using three rectangular slots cut Bow-tie shape ground plane. Against the conventional ground plane design, modified ground plane antenna yields 25% bandwidth increment, 0.03λg reduction in substrate thickness, 35.12% reduction in the resonance frequency, 66% reduction in the patch area with a broadside peak gain of 5.5 dBi. Reported wideband configurations do not provide bandwidth enhancement with a patch size reduction, and thus this is the novelty in the proposed work. Simulated results are have been experimentally verified that shows close agreement.