A D-Band 120-GHz 2-D Scalable 4 × 4 Relay Array With Orthogonally Polarized On-Chip Antennas and In-Front-End Fast 2-D Angle-of-Arrival

Abstract

This work presents a 120-GHz 4 × 4 active reconfigurable reflective relay array that can enable D-band non- line-of-sight (NLOS) wireless communication links in scenarios with heavily blocked line-of-sight (LOS) paths. The relay array employs orthogonally linear-polarized on-chip 4 × 4 transmit- ting/receiving antenna arrays, and is 2-D scalable on a λ/×λ/2 grid. In addition, mixed-signal and low-latency loops are inte- grated within the front ends of the relay’s channels to detect the angle-of-ar