A wideband circularly polarized cylindrical DRA loaded with SRR and excited with a question shaped microstrip feed line

In this paper, a split ring resonator (SRR) loaded with cylindrical dielectric resonator antenna (DRA) for application in wideband circularly polarized presented has been presented. The orthogonal mode in DRA is excited by using a question shaped microstrip feed line to realized circular polarization. Here SRR is used for input impedance matching only. In this antenna HEM
_11δ
mode has been excited and observed by rotation of E-field inside the cylindrical DRA. This designed antenna offers -10 dB input impedance bandwidth of 38.17% (centered at 3.17 GHz) and 3-dB axial ratio bandwidth in broadside direction of 19.26% (centered at 3.01 GHz). In addition, this antenna offers left-handed circular polarization (LHCP), stable gain and radiation efficiency in broadside direction. Designed antenna is appropriate for WiMAX (3.3-3.7 GHz) applications.