The ULTRAWAVE D-band (141 – 148.5 GHz) point to multipoint wireless system consists of a network of Transmission Hubs to produce wide sector area coverage and compact Network Terminal Equipment units (terminals) to be deployed arbitrarily in the coverage area. The transmission hubs are connected to the fiber and interconnected between them by G-band (275 -305 GHz) ultrahigh capacity links. Both D-band transmission hubs and terminals use simple radio topology. This is an important design aspect for the economy of the system, since the electronics at D-band is very challenging, not only in terms of MMMICs (millimeter wave Monolithic Integrated Circuits) but also interconnections, transitions, assembly.
Two novel high power Traveling Wave Tube (TWT) amplifiers, one at D-band and one at G-band, has been designed and are in final fabrication phase, to provide transmission power to satisfy the link budget in their respective bands of operation.
A novel D-band MMMIC (millimeter waves monolithic integrated circuit) chip set, antennas, housing, mother board, filters were designed, built and tested.
The G-band point to point system presented a formidable technology challenge due to the short wavelength. A proof of concept configuration has been developed. A G-band transmitter includes a photonics transmitter to produce the modulated signal, a MMIC power amplifier as driver of a G-band TWT, to produce the required transmission power, connected to a high gain antenna. The receiver includes an antenna connected to a new generation Low Noise Amplifier and a downconverter at D-band.
The novelty in combining TWTs of new design with advanced transceiver at D-band and G-band is a progress beyond the state of the art.
The advances in D-band and G-band technology introduced by the ULTRAWAVE project will boost the European sub-THz industry and independence, speeding up the deployment of innovative products suitable not only for the wireless economy sector, but also for other telecommunication systems or applications such as high resolution radar and imaging.