calculate diode power
Did you have it biased up properly? 100 mA per diode when forward biased and 100 VDC reverse bias?
Also, you might have blown out the diodes when switching from one state to the other. Most people turn off the RF high power when switching, and turn the RF back on well after they are sure the diodes have switched. Notice that the thermal resistance is very high for a "high power" diode, meaning they are NOT designed for actually dissipating a lot of heat. Silicon diodes really should not be running over 150 degrees C for even short periods, and 120 degrees C in the steady state. That means that the diodes junction to lead temperature, and lead to ground plane temperature, can not add up to very much!
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