Enhancing the resonance characteristics of circular patch antenna for SHF applications

Abstract

Microstrip patch antenna is attractive for various applications due to its easy fabrication, low cost and
small size. It simply comprises of a radiating patch and ground plane that are separated by a dielectric
substrate. However, the resonance bandwidth of the microstrip antenna is still an issue that needs to be
considered in research. This paper aims to enhance the bandwidth of a microstrip antenna or introduce
more resonant frequencies within the Super High Frequency (SHF) band. The paper demonstrates
empirical results for circular-shaped patch antenna using the High-Frequency Structure Simulator
(HFSS). It begins by investigating different patch sizes and substrate materials so that an optimal
preliminary design is introduced. Then, different slot shapes are inserted into the patch for significant
enhancement of the resonance characteristics. As a result, new ultra-wideband (UWB) antenna designs
are presented with bandwidth results reaching 15.5 GHz within the C, X, Ku, and K bands. Also, new
multiband antenna designs are presented with improved reflection valleys in the Ku, K, and Ka bands.