Millimeter-wave cavity-backed antenna array with high gain and simple structure

Antennas in high speed wireless local-area network (WLAN) at 60 GHz is now becoming a hot topic, and high-gain properties are often preferred due to high transmission loss of the frequencies around 60GHz. In this paper, a 2-element cavity-backed antenna (CBA) array is proposed, which is excited by bowtie dipoles and fed by a transition from a coaxial line to parallel strip lines. The array prototype is fabricated and measured after the parametric optimization is performed. The measured and simulated results agree reasonably with each other, proving that the array can feature an impedance bandwidth of ~8.3% for SWR ≤ 2, a broad gain of 12.6-13.6 dBi, and cross polarization of around -20 dB.