Dual‐band CP coplanar waveguide‐fed split‐ring resonator‐loaded G‐shaped slot antenna with wide‐frequency ratio

Abstract

This study presents a dual‐band circularly polarised (CP) coplanar waveguide fed split‐ring resonator‐loaded rectangular slot antenna. A wide‐frequency ratio (the ratio of the centre frequencies of the two bands) ranging from 1.2 to 2 can be achieved by changing the dimensions of the resonator. To demonstrate the concept, an antenna having two bands, one at 2.4 GHz and the other at 3.5 GHz, is designed and measured input reflection coefficient, axial ratio, and radiation pattern are compared with the simulation results and they are found to be in good agreement. Measured results show that the proposed antenna operates in two frequency bands with overlapping bandwidths of 32.13% (2.22–3.07 GHz) and 2.17% (3.415–3.49 GHz). The axial ratio and impedance bandwidths are used to compare the performance of the proposed antenna with some of the published dual‐band CP antennas.