Figure 1 (Left) Conventional transmitter (Right) Transmitter when the developed technology is applied
Fig. 2 Conceptual diagram of the developed 3D wiring structure and the GaN power amplifier composed of it, and its mounting photograph
Fujitsu: Miniaturization of radio wave transmitters: High power broadband power amplifier
August 4, 2020
Fujitsu Laboratories:
We have newly developed a design technology for high-power broadband power amplifiers.
Enables downsizing of radio wave transmitters.
By applying to the power combiner,
Widening the amplifier’s wideband performance to twice the conventional level,
Achieved downsizing of the device.
Power amplifier (power amplifier):
With one power amplifier,
From hundreds of megahertz (MHz)
Up to several gigahertz (GHz)
The signal can be output in a wide frequency band.
We developed this design technology.
Wideband power amplifier:
This time, the power amplifier/power combiner has an impedance conversion function.
This will reduce the impedance difference between the transistor and the power combiner.
Realization method:
As a means,
Hollowing out the housing under the thin circuit board,
Form a wide range of signal wiring on both the front and back sides of the board,
We have applied a coupled line with a three-dimensional wiring structure to a power combiner.
Double the frequency band:
Based on this design method,
Compared to conventional amplifier performance
Double the frequency band,
It was realized without damaging the high output characteristics.
By applying this technology, multiple power amplifiers, which were required for each frequency, can be shared.
The radio transmitter can be significantly downsized and the structure can be simplified.
Details of this technology will be announced at the international conference “IMS2020 (International Microwave Symposium 2020)” to be held from Tuesday, August 4th.
Development background:
To transmit radio waves in various frequency bands,
Install a radio wave transmitter that covers the frequency band corresponding to the standard for each application,
It is necessary to prepare different power amplifiers for each (Fig. 1, left).
Conventional problems:
However, since the size of the radio wave transmission device increases, a single device cannot cover the frequency bands that support multiple standards.
Development of a high output power amplifier that can be shared is required.
The power amplifier works to extend the reach of radio waves by increasing the transmission signal to the required output.
Among the components that make up the radio wave transmission device, it is difficult to cover a wide frequency band with high output, which has been a factor that prevents the radio wave transmission device from being shared.
Fujitsu