300GHz-Band CMOS Wireless Transceiver

300-GHz band, a frequency range exceeding 275 GHz, is currently unallocated. Research aiming at 100-Gbps-class wireless communication using that frequency band has attracted attention. We have realized the chipset of 300 GHz band wireless transceiver using CMOS integrated circuit although the high frequency characteristics of silicon transistors used in CMOS integrated circuits are inferior to that of transistors of compound semiconductors. The drawback of this property was overcome by circuit technique. In this paper, after describing the 300 GHz band CMOS transceiver circuit, we introduce the module for connecting the CMOS chip to the waveguide antenna.