Wideband Diversity Cylindrical Dielectric Resonator Antenna Based on Multimode Resonance

A wideband pattern-diversity cylindrical dielectric resonator antenna (DRA) with high isolation is proposed. Based on the equivalent medium principle and the presented DRA structure of wheel shape, the resonant frequency of the HEM
_11
δ
mode is increased and combined with that of the HEM
_12
δ
+1
mode to obtain a wide operation band, both of which are excited by a rectangular slot. In addition, the TM
_01
δ
mode with wideband impedance matching is well excited by a probe in the presented antenna. The TM
_01
δ
mode with omnidirectional pattern and the HEM
_11
δ
and HEM
_12
δ
+1
modes with an unidirectional pattern are utilized to obtain wideband pattern-diversity DRA. For verification, a prototype of the presented DRA was fabricated and measured. The measured overlapped impedance bandwidth is about 30% (3.08–4.16 GHz), and the port isolation is higher than 30 dB. Besides, the envelope correlation coefficient is very low.