LAUSR

A compact four-element MIMO antenna with high isolation is proposed. It is constructed in two half-mode substrate-integrated-waveguide cavities, which are placed back-to-back by sharing a row of vias to achieve compact size. Fed by coaxial ports, four antenna elements are formed which radiate cavity energy through opened edges. Two T-shaped slots and two pairs of anti-symmetric U-shaped slots are etched on the cavities to enhance the isolation among antenna elements. A prototype operating at 3.52 GHz has been fabricated and measured. With the size of 0.61 λ 0 × 0.61 λ 0 , the measured overall isolation of 14.0 dB, an envelope correlation coefficient of 0.02 and a peak gain of 4.3 dBi are obtained. The proposed MIMO antenna has potential applications in wireless systems.