Capacitors have a maximum current as well as a maximum voltage.

To simplify, high *Q* gives a low ESR, with lower power dissipation for a given current.

You need to know either the manufacturer's current rating, or an estimate for power rating of the capacitor package, and calculate the RF current through the capacitor in your circuit.

In a resonant circuit used for power coupling, the current through the reactances may be larger than that delivered to the load ("circulating tank current").

+40 dBm = 10 W, so this is an important quantitative problem.