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5. Conclusion
In just a few decades, solid-state technologies have made enormous strides; in parallel and independently, in many systems (radar, telecommunications), peak power requirements have fallen, following the switch to digital, thanks to sophisticated signal processing algorithms, or simply as a result of the widespread use of phased-array antennas (or active antennas). These two developments have combined to push the introduction of SSPAs into markets that were long the preserve of tubes.
The latest development in solid-state technology is the switch to wide-gap materials, notably GaN. These have made it possible to increase accessible power by a factor of around 5, and to increase efficiency by 5 to 10% for the same power, thanks to the elimination of several combiner stages. GaN technologies also enable the realization of low-level functions and, in particular, excellent...
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A complete list would be difficult to draw up in the case of the solid state, given the diversity of the players involved. It would have to include epitaxial wafer manufacturers, foundries (open or not, or even captive foundries, some of which are large industrial laboratories with a predominantly research activity), design houses, microelectronics assembly companies, transmitter manufacturers and even some...
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