Size the continuous source, converter, wiring and connector for measured driven average and RMS current, then size local energy storage and transient response for the pulse-on or burst step. Record quiescent, average, peak, edge rate, pulse width, duty cycle, burst length, inrush and fault current at the intended voltage, RF drive, load and temperature; RF output watts alone are not a DC requirement.
Reject a supply that meets average watts but enters current limit, exceeds allowed rail droop, rings, recovers too slowly or becomes unstable with the final cable, input filter and output capacitance. State whether the source or local capacitor supplies the first part of the step, and coordinate protection so normal pulses do not trip while unsafe current is still interrupted within the required time.
As a first check, a 4 A step lasting 100 µs with 0.5 V allowed ideal droop needs C = ΔIΔt/ΔV = 800 µF before ESR, ESL, tolerance and converter response. Supply the current waveform, rail limits, wiring, capacitance, input range and temperature so the final design can be verified by load-step and RF tests rather than by wattage comparison alone.