Radiation Pattern Decoupling of Low-Profile Substrate Integrated Dielectric Resonator Antennas

A decoupled $1\times 2$ cylindrical substrate integrated di-electric resonator antennas (DRAs) is presented using metallic vias and rectangular strips. The two externally tangent cylindrical DRAs are implemented in a printed circuit board (PCB) with two different substrate layers, where the upper and the lower sub-strates are used for antenna structure and feed network, respectively. By inserting vertical metallic vias into the upper substrate and attaching horizontal strips at both sides of the intersection, reduced isolation and distorted radiation pattern caused by mu-tual coupling is corrected, resulting in symmetric radiation pat-terns and maximum radiation along z-axis. To verify the idea, a design working at 24.00-24.25 GHz is designed. It can be found that the isolation between the two ports are higher than 15 dB, the envelope correlation coefficient (ECC) is below 0.002, and the maximum radiation is along z-axis, which makes the antenna suit-able for multiple-input and multiple output systems.