RF filter power handling must be derived from dissipated heat and local voltage or current stress under the real waveform, mismatch, mounting and temperature. A headline connector power is not transferable when insertion loss, airflow, baseplate or duty cycle changes.
As a screen, a 100 W CW signal with 0.8 dB insertion loss delivers about 83.2 W; roughly 16.8 W is not delivered, with the non-reflected portion becoming heat inside the network. That heat can shift resonance and raise loss. Pulse peaks, arcing, dielectric limits, reverse power and PIM may set a lower boundary than average thermal load.
Provide CW, peak and average levels, pulse width, duty cycle, crest factor, VSWR magnitude and phase, simultaneous carriers, ambient/baseplate temperature, cooling and mounting. Acceptance should combine low-level S-parameters, powered thermal soak, post-soak mask verification and nonlinear or PIM tests where relevant.