Terahertz Absorber Technologies for Close-Proximity Wireless System

This paper presents the terahertz absorber technologies for a close-proximity wireless system. We have proposed slot ring resonator (SRR) absorber integrated planar slot array antenna for a 120-GHz-band close proximity wireless system, and we have already shown that the SRR absorber formed on quartz substrate suppresses multiple reflection between Tx-Rx antennas by simulation. We have evaluated the alignment margin of the close proximity wireless system using the SRR absorber integrated planar slot array antenna. We simulated the transmission characteristics of the close proximity wireless system using the SRR absorber integrated planar slot antennas. The received power decreases by more than 30 dB when Rx antenna moves from the position directly above Tx antenna by 4.9 mm in the plane parallel to Tx antenna in case a single waveguide slot antenna is used for both of Tx and Rx antenna. When the SRR absorber integrated planar slot antennas are used for both of Tx and Rx, S21 becomes -17.5 dB and its fluctuation becomes below 3.6 dB in case Rx antenna deviates from the position directly above Tx antenna by 4.9 mm.