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Measure the reflected power that is directly related to VSWR. You need a very good directional coupler and a a good detector (you need to compensate it in temperature).
regards
No because of the wide band but transistors like LDMOS are very ruggedness and if you are very quick in detection and in switching off the driver you should succeed in protecting your amplifier
Normally there should be some mistmatch at the output. I mean, perfectly matched does not mean max output power.
Anyway, if you want be able to remove the antenna without damaging the PA a way is to measure the reflected wave with a coupler + ADC and turn off the PA.
How do you connect PA to antenna?
If you are using a waveguide, you may done it indirectly by measuring the air pressure in it. (if there is a great lost of pressure, the waveguide must be disconnected, or badly damaged). If pressure falls badly, use automatic device which will shut down PA.
If you are not using WG, circulator is best, but the most costly solution.
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