Abstract
A novel dual-band two-element directional multiple-input-multiple-output (MIMO) antenna system is presented with 68% miniaturisation, which is achieved using a semi-loop meandered driven element and a small ground plane. The centre frequency of operation is 2GHz. The antenna system covers two bands: the telemetry L-band 1.27-1.43GHz and the global system for mobile communications/long-term evolution band 1.8-2.133GHz. The simulation and measurement results are in good agreement. The proposed antenna system mimics the quasi-Yagi antenna configuration with a measured front-to-back ratio of around 15dB at 1.35GHz and 17dB at 2GHz, which is achieved without using a large ground plane, extra metallic structures, multiple reflector elements, or any complex technique. A gain of more than 5dBi is measured for the single element with a total radiation efficiency of around 85% in both bands. The measured isolation of the proposed MIMO antenna is more than 15dB with <0.0785 measured envelope correlation coefficient values in both bands.