typical for this forum, you have not given us enough information to comment. what is:
bandwidth
return loss desired
operating temperature
switching speed
cold or hot switching
available DC power supply voltages
RF power: 200w CW? Pulsed? Duty cycle?
a PIN diode 200 W CW switch will get....pretty flippin hot. U will have to cool it!!!!
If u do not know the answers to these questions, then do not try to design this switch, buy it from someone who does know the technology, or u will end up with a molten ball of aluminum.