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World's fastest CMOS wireless transceiver at 56Gbit/s

Posted: 02 Feb 2016 ?? ?Print Version ?Bookmark and Share

Keywords:Tokyo Institute of Technology? Fujitsu Laboratories? mm-waveband? CMOS? wireless transceiver?

2. Modularisation technology

The signal converted to the mm-waveband by the semiconductor chip is transported over the circuit board's signal path and supplied to the antenna. Because the antenna is made out of a waveguide (a metallic cylinder), there needs to be an ultra-wideband, low-loss connection between the PCB and the waveguide. Fujitsu Laboratories and Tokyo Institute of Technology developed an interface between the circuit board and waveguide that uses a specially designed pattern of interconnects on the printed circuit board to adjust the impedance for the ultra-wideband range, enabling loss in the desired frequency range to be greatly reduced.

Transceiver configuration

Transceiver configuration

In this development project, Tokyo Institute of Technology was primarily responsible for reducing transceiver-circuit losses and developing broadband technologies, while Fujitsu Laboratories mainly handled modularisation technologies.

Results

Indoor data-transfer tests were conducted, with two modules facing each other separated by a distance of 10cm. These tests achieved data-transfer rates of 56Gbit/s, with loss of maximum 10 per cent between the waveguide and circuit board.

By combining the technologies developed in this project with high-output amplifier technology, used to amplify the signal and increase the transport range, and baseband-circuit technology, used to process ultra-wideband signals, it is possible to increase the capacity of wireless equipment that can be installed outdoors. By doing so, even in places where new fibre-optic lines are difficult to install, such as urban areas and places surrounded by mountains or rivers, a high-capacity wireless base station network can be deployed, thereby contributing to the provision of a comfortable communications environment in those places.

Fujitsu Laboratories aims to have a commercial implementation of wireless trunk lines for cellular base stations around 2020.


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