A 300-GHz 5T5R Silicon-Based MIMO Transceiver Integrated With a 2-D Multifocal Transmit-Array

This article presents a 300-GHz 5T5R silicon-based multiple-input multiple-output (MIMO) transceiver integrated with a multifocal transmit-array (TA). 300-GHz transmitter and receiver chips are integrated and share the TA with 2-D distributed foci for achieving a compact system size and a large throughput. To extend the scanning angle and reduce the scanning loss, the Gaussian phase correction is proposed to develop the TA. Thus, multiple transmitting and receiving beams with different beam directions within a wide coverage angle can be realized. As a proof of concept, five pairs of transmitter and receiver chips are configured in a cross formation on the focal plane of the multifocal TA for a 5T5R MIMO transceiver, illustrating that the proposed architecture has a wide coverage angle of ±40°. Experiments are carried out to verify the proposed design. The measured downlink peak effective isotropic radiated power (EIRP) at saturation and the uplink conversion gain are 30.6 dBm and 7.9 dB at 307 GHz, respectively, leading to a total throughput of 66.8 Gb/s. The experimental results confirm the applicability of the proposed architecture, which can be a promising solution for improving the transmission capabilities of terahertz (THz) wireless communication.