Slot Loaded Circular Microstrip Antenna for Circular Polarized Response

Abstract

A circular microstrip antenna embedded through an e-shape slot is stated for a circular polarized response. The projected antenna shows an overall gain improvement of more than 5 dBi over the bandwidth, an impedance bandwidth of 75 MHz, and an AR bandwidth of 40 MHz. The said work lacks a detailed analysis of resonant modes that produce the circular polarized response. Also, the structure complexity increases due to the use of an e-shape slot moreover the cost increases owing to the use of RO4003 for fabrication. The present paper gives the alternative simple structure for realizing circular polarized response using a circular microstrip antenna embedded with a simple circular slot fabricated on Arlon substrate. Identifications of patch modes are supported by in-depth parametric analysis. The proposed low profile cost-effective antenna is simple in structure and yields a VSWR bandwidth of 45 MHz, AR bandwidth of 15 MHz with an inclusive gain of greater than 4.5 dBi over the impedance bandwidth