High gain stacked antenna array for 60 GHz communication systems

A high gain and wide band stacked antenna array, having a microstrip aperture coupled feeding technique with a mounted Horn integrated on it, is presented. With optimized parameters, the 2×2 antenna array at a center frequency of 60 GHz, exhibits an impedance bandwidth of about 10.58 % (58.9 - 65.25 GHz). With a corporate feed network, the 2×2 array structure resulted a gain of 15.3 dB with an efficiency of 83%. While the 4×4 array structure provided further gain improvement of 18.07dB with efficiency of 68.3%. The back radiations are reduced by making use of a reflector at λ/4 distance from the corporate feed network. The proposed design is modelled in CST Micro Wave Studio. The results are verified using HFSS, which are found to be in good agreement.