Dual-band Beamsteering Microstrip Antenna Array for Joint Communication and Sensing

This article introduces a simple, but novel, concept of a single-layer dual-frequency microstrip patch antenna array for joint communication and sensing operating at 24 and 28 GHz. The frequencies are separated by polarization: the radar sensing function at the 24-24.25 GHz ISM band is vertically polarized, whilst communication at the n261 (27.5-28.35 GHz) band for 5G NR uses horizontal polarization. Based on simulation results, the antenna array is expected to achieve an azimuthal scan range of ±45° at the radar band with frequency scanning in elevation limited to only ±1°. The scan ranges for communication are ±45° and ±40° in azimuth and elevation, respectively.