Single-Feed Dual-Band Circularly Polarized Dielectric Resonator Antenna for CNSS Applications

A cross-slot-coupled dual-band circularly polarized rectangular dielectric resonator antenna (RDRA) with a small frequency ratio (1.23) based on compass navigation satellite system (CNSS) applications is designed, fabricated, and measured. The RDRA is excited to resonate at two pairs of near-degenerate orthogonal modes of TE111 and TE113, and a cross slot is introduced to simultaneously achieve dual-band right-hand circular polarization. The measured -10 dB impedance bandwidths of 11.4% and 8.4%, 3-dB axial ratio (AR) bandwidths of 2.1% and 2.2%, and antenna gains of over 5.4 and 4.3 dBic are obtained for CNSS B3 and B1 bands, respectively. Reasonable consistency is achieved between measured and simulated results of reflection coefficients, ARs, and radiation patterns.