MITSUBISHI Electric has developed a new S-band (2.5-2.7GHz) amplifier module which has high output power, high gain and low distortion.
Available from Glyn Ltd , the module is for transmission usage as part of the multi-channel multi-point distribution service (MMDS), which provides wireless broadband internet access to household users via fixed radio base stations.
Recently MMDS, which is capable of covering a range of 30km from each individual fixed base station, has been one of the fixed wireless access (FWA) systems drawing considerable attention, in the United States in particular.
MMDS was traditionally used for uni-directional cable television services. However, with the addition of a bi-directional communication capability it now allows for wireless broadband connection services, the market for which looks set to expand significantly in years to come.
In order to increase usage of these services, a means of making cheaper the equipment required by household users to enable a wireless broadband connection, is currently being sought.
However, lowering the cost of modules has been made problematic due to the fact that in order to reduce the negative effect of interference with other users of MMDS, a transmission device possessing high linearity and low distortion is absolutely necessary.
In response to this problem, Mitsubishi Electric developed this new, low-cost S-band amplifier module, which possesses a saturation power of 30W.
Looking to the future, Mitsubishi Electric intends to continue to be active in developing products capable of enabling wireless broadband access on alternative bandwidths in countries all over the world.
The new S-band amplifier module allows for high quality transmission from radio base stations, and thanks to Mitsubishi Electric's HFET1 device technology, a saturation power of 30W was achieved.
At a high output power, such as 34.5dBm (approximately 2.8W), the linear gain is high (21dB) and distortion is very low (minus 60dBc), and yet there is no interference with other channels.
Plus, due to the use of a new module structure, the price is nearly half that of its discrete device predecessor, providing a significant saving to household users.
Finally, as the module possesses an internal matching circuit, the load on the matching circuit in the equipment required by household users is eliminated.