A D-Band Transmitter Achieving 57.6-Gb/s and 30-dBm EIRP Based on Channel-Aggregation 45-Nm ICs and a Low-Profile Flat Lens Antenna

We present two high-efficiency baseband (BB)-to- <inline-formula> <tex-math notation="LaTeX">${D}$ </tex-math></inline-formula>-Band transmitting systems based on a novel channel-aggregation architecture. They comprise a first integrated circuit (IC) for channel aggregation at intermediate frequency (IF) and a two-channel 45-nm CMOS transmitter (TX) flip-chipped on antenna-in-package (AiP), which illuminates a high-gain flat lens antenna in standard printed circuit board technology. The two signals emitted by the active antenna module, in adjacent bands, are aggregated over the air and collimated by the flat lens. Two TXs using a standard and a folded transmitarray antenna (TA), three times thinner than the former one, are realized and compared. They achieve similar performance in the operating band (139.3–156.6 GHz), with a measured peak effective isotropic radiated power (EIRP) of 30 dBm. A wireless point-to-point link is demonstrated with the proposed transmitting system and a commercial receiver. A data rate (DR) of 57.6 Gb/s is measured at 1 m using eight channels and a 16-quadrature amplitude modulation (QAM) scheme, with an energy efficiency of 27.4 pJ/b.