An Enhanced Gain Dual-Polarized Dielectric Resonator Antenna Array with High Isolation for C-Band Applications

This article presents the design and performance analysis of a high gain dual-polarized twoelement cylindrical dielectric resonator antenna (DRA) array excited by two orthogonally placed Hshaped apertures. The antenna is operated in dual linear polarized mode by exciting TM110 (HEM11) mode in two DRAs using aperture coupling. The proposed antenna has a -10 dB impedance bandwidth of 9.52% (6.0-6.6 GHz) with isolation more than 40 dB among the two ports. Realization of gain enhancement and high isolation are accomplished by simultaneously exciting two DR elements using a pair of wideband Wilkinson's power divider placed on the bottom side of the substrate. The measured gain of the proposed antenna for both the ports is found to be 12.5 dB with a front to back ratio of 16 dB. The antenna has an overall radiation efficiency of 94% and symmetrical radiation patterns with co-polarization levels 40 dB higher than the cross-polarization in both the principal planes (XY and XZ) of bore-sight direction.