Design and analysis of wideband composite antenna with dual-sense circular polarization characteristics

In this article, a dual-sense circularly polarized (CP) hybrid antenna is reported. The proposed hybrid antenna comprises of an asymmetrical square ring-shaped printed line and a rectangular dielectric resonator (RDR). The asymmetricity present in the square ring is responsible for creating CP radiation with the opposite sense characteristics in the proposed antenna. Also, modified printed ring is used to excite TE111 mode in the loaded RDR. This loading enhances the overall impedance bandwidth of the proposed antenna. For practical verification, a prototype of the proposed antenna is fabricated and tested. The measured outcomes indicate a close concurrence with the simulated outcomes. The proposed antenna works over the frequency range 3.28 GHz-5.78 GHz with a fractional bandwidth of 55.18%. Dual CP wave with dual-sense characteristics (Axial Ratio<3 dB) are created in the frequency range 3.81-4.28 GHz and 4.98-5.28 GHz respectively. These responses make the proposed antenna suitable for WLAN and WiMAX applications.