Dual-band circularly polarized cylindrical dielectric resonator antenna for millimeter-wave applications

This paper presents a compact dual-band circularly polarized cylindrical dielectric resonator antenna (CDRA) that operates at 38 and 60 GHz. The proposed design is contained a single wafer of silicon and two annular slots to exciting the DRA. Shorted outer and inner annular slots implemented to generate circular polarization in both bands. The proposed design of CDRA achieves a 3-dB AR bandwidth of 3.34 and 7.53%, with an impedance bandwidth of 9.74 and 24.01% at lower and upper bands, respectively. Also, it has excellent radiation characteristics, which its radiation efficiency and peak gain of 7.6 dBi and 95.22%, respectively. The proposed CDRA with dual-band resonances and gain bandwidth has the excellent potential to be applied for mmwave wireless communications at the 38/60 GHz bands.