Wide Dual-Band Circularly Polarized Stacked Rectangular Dielectric Resonator Antenna

A wide dual-band circularly polarized (CP) stacked rectangular dielectric resonator antenna (DRA) is presented. The stacked rectangular dielectric resonator (DR) has two layers, and it is excited by an asymmetrical cross-slot. Three sets of degenerate orthogonal modes in the stacked rectangular DR and the slot modes are utilized to realize dual-band CP radiation. It is found that the quasi- TE
₁₁₁
mode and slot modes are for the lower band, and the quasi- TE
₁₁₃
and quasi- TE
₁₁₅
modes are for the upper band. The proposed antenna was simulated and measured, and the measured results agree well with the simulated ones. The measured 3-dB axial-ratio (AR) bandwidths of the two bands are 9.7% and 20.0%, respectively.