Also, a model of the system will be developed using ADS to enable analysis of the entire output network, which will allow optimum performance to be derived. This work will provide initially a theoretical model for the MPA, which will be updated by the inclusion of real measured data taken for the various components in the model.
The key issues to be addressed by this project are:
At the conclusion of the project, new architectures of wideband L-band and S-band SSPAs will have been developed, built and tested to EQM level. Also, a new small-footprint S-band ONET will have been developed - this ONET will be incorporated into an MPA to assist theoretical modelling of the entire MPA. By operating at the higher S-band, a wider bandwidth capability will be available for expanded future mobile telecom applications.
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The architecture of the MPA system is shown in the figure at left. |
The prime items for development where critical performance of the MPA can be enhanced are the SSPAs and the ONET. A new folded-ONET was proposed, optimised for operation at S-band; scaling the new design back down to the currently popular L-band frequency band will be possible. A new SSPA will be developed, incorporating a new GaAs MMIC chip-set, new output power stage, improved control architecture, and new mechanical packaging incorporating a metal matrix composite (MMC) chassis for improved heat transfer and reduced mass. An ADS model will be constructed and populated with real measured data to enable the performance of the system to be evaluated when exercising the operational variables.
A Phase-A study identified a program of work to produce L and S-band SSPAs, using a new MMIC chip-set, metal matrix composite (MMC) chassis, a new S-band ONET, and the development of an MPA model. Phase-B kicked-off in November 2003.
his programme is now complete and has proved to have been extremely valuable for application to future mobile payload applications.
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