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exceptionally efficient operations. Background


In line with the advancement of a network-based society, radio wave demand in a variety of wireless systems is expected to increase even further. For example, in the field of smartphones and other wireless communications, there is a shortage of available frequencies. Using millmetre waves to accommodatethis increase in demand is being given consideration. Likewise, aircraft currently employ the 10 GHz frequency band, but a move toward usage of higher frequencies is expected to take place in the future.


Current generations of high-output millmetre-wave transceiver modules consist of separately packaged transmitter and receiver components. Being able to integrate both functions in a single unit, however, will enable equipment to become more compact.


operates in the millmetre-wave band.


Figure 2: Diagram of the millmetre-wave GaN transceiver module


Figure 1: Usage scenarios for the millmetre-wave band Technical Issues


Transceiver modules, needed for millmetre-wave communications and radar, must possess wideband capabilities for operating in the millmetre-wave band, as well as high-output performance sufficient enough to cover wide geographic areas.


When developing a transceiver module with 10 W-class high-output power, it is critical to improve the transceiver module’s heat dissipation characteristics, as heat generation intensifies in tandem with higher output levels.


What’s more, it is also necessary to reduce signal loss in connector components. This is because, at higher frequencies, loss increases in the components connecting the chip and the wiring that transmits a signal.


Newly Developed Technology


Fujitsu Laboratories has developed a compact, high- output transceiver module that uses GaN-HEMT and


July 2013 www.compoundsemiconductor.net 111


Figure 3: Photo and structure of the millmetre-wave GaN transceiver module


Results


This new technology will make it possible to achieve high-output transceiver functionality with a single unit, thereby leading to improved performance and more compact and lighter equipment for wideband communications and radar systems.


Future Developments


Fujitsu Laboratories plans to put this technology to use in a wide range of applications that require compact modules with high output across wide bandwidths, including wireless devices and radar systems.


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