Novel Planar Wideband Antenna Integrated with Compact Flat Reflector for Millimeter-wave Communications

This paper introduces a novel planar millimeter wave reflector antenna designed for wireless communication systems. The reflector, with two dielectric and conductive parts, is integrated with a microstrip antenna thus, the compact reflector antenna with a thickness of ≈ 2 mm is developed. The proposed antenna operates in a wide impedance bandwidth of about 121.2 % from 21.7 GHz to 88.4 GHz and presents a maximum gain of 11.8 dB at 67 GHz. Meanwhile, it has a total radiation efficiency greater than 89 % in the whole 60 GHz frequency band.