Wideband circularly polarized sectored conical dielectric resonator antenna excited by S-shaped slot

A conical sectored dielectric resonator antenna (DRA) loaded on S-shaped slot square patch for wideband circular polarization is investigated. Wideband circular polarization (CP) is achieved by single tab extended at right top corner of the square patch along with the introduction of sectors on the top of DRA and S-shaped slot on the patch. Calculated size of slot along with optimized height and size of DRA through parametric study helps to get wide impedance bandwidth. In addition, optimized size of single tab gives the wide axial ratio bandwidth. The 210 dB impedance bandwidth is 100.18% (2.1-6.0 GHz) and 3-dB axial ratio (AR) bandwidth is 69.52% (3.0-6.2 GHz). The gain variation is around 3 dBi and radiation efficiency is around 80%-95% within the AR bandwidth. The proposed model is fabricated and measured which agree well with the simulated results.