Design of Dual-Band Filtering Dielectric Resonator MIMO Antenna

Abstract

This paper describes the development of a dual-band two-port cylindrical dielectric resonator MIMO filtenna for wireless applications. The initial structure shows a single element CDRA which is excited employing a hybrid feeding technique (conformal strip and stub extended from microstrip feed line). The filtenna radiator is a complementary dipole structure in which the ground plane acts as an electric dipole and the CDRA radiates as a magnetic dipole. The lowest order $\mathbf{HEM}_{\mathbf{11}\boldsymbol{\delta}}$ mode is generated inside the DRA. The conformal strip with the microstrip stub is in charge of achieving filtering characteristics in terms of both reflection coefficient and gain. Further, the single-element antenna is replicated to configure a two-port MIMO antenna with a fractional bandwidth of 7.14% and a gain of approximately 5.8 dB. The diversity performance of the antenna also shows satisfactory results with improved isolation of better than 24 dB between the two ports.