A Wideband Millimeter-Wave Circularly Polarized Dielectric Resonator Antenna With a Stacked Strip Using SISL Technology for 5G Applications

A wideband millimeter-wave circularly polarized (CP) dielectric resonator antenna (DRA) is proposed in this letter based on substrate-integrated suspended line (SISL). To generate CP waves, a square DRA is cut off two corners. The introduction of the dielectric ring not only serves to fix the DR, but also improves the antenna matching and axial ratio bandwidth. In order to increase the axial ratio bandwidth and realized gain, a stacked strip is introduced on the C1 layer. The proposed antenna is fabricated and measured, and the measured results show the antenna has an impedance bandwidth of 27.94%, which is from 23.4 GHz to 31 GHz. The axial ratio bandwidth of 30.55% is from 23.3 GHz to 31.7 GHz, and the measured peak gain is 7.5 dBic.