Compact Design of Dual-Band Circular Polarized Microstrip Antenna with Single Feed

TL;DR

This paper presents a compact dual-band circularly polarized microstrip antenna with a single feed, integrating a square patch with corner truncation and a concentric circular patch with slits to generate dual sense CP.

Contribution

It introduces a novel antenna design that achieves dual-band, dual-sense circular polarization with a single feed, enhancing compactness and polarization control.

Findings

The antenna successfully generates dual sense CP in two orthogonal planes.

Low cross-polarization levels are achieved.

The design allows control of resonant frequencies via geometric parameters.

Abstract

A novel and compact dual band dual sense circularly polarized microstrip patch antenna with single coaxial feed has been reported in the present work. The key idea of generating dual band circular polarisation (CP) is the integration of a square patch with corner truncation and a smaller concentric circular patch with double slits. The first resonance is provided by the larger patch whose corner truncation generates two orthogonal modes. The inner patch controls the higher-order resonance with the CP contributed by two narrow slits. The higher order resonating frequency can be monitored by controlling the dimensions of the circle and the slits. The antenna provides the CP in two orthogonal planes with two different sense of polarisation. The lower order CP is of left-handed orientation, whereas the higher order shows right-handed polarization. The cross-polarization level is also found to be very low.