Design Considerations for Focal-Plane Array Antennas for 6G Millimeter-Wave Backhaul Links

We present three designs of W-band Focal-Plane Array (FPA) antennas as possible candidates for the next-generation millimeter-wave (mmWave) backhaul links. The considered FPAs comprise different types of waveguide antenna elements and are optimized to feed a prime-focus reflector with 400 mm aperture diameter. The main design goal is to realize a high directivity (50 dBi) with minimum beam scan loss, while complying with the strick side-lobe level requirements (ETSI class 3).