Plain-language answer: A capacitor stores energy in an electric field and presents reactance that normally decreases as frequency rises until parasitic inductance matters.
Why the real component differs from the ideal
RF suitability depends on dielectric, ESR, voltage, current, temperature coefficient, loss, construction, and self-resonance—not capacitance alone.
What to verify
Check RF voltage and current ratings, dielectric type, ESR, tolerance, temperature, and operating frequency.
The common mistake
Using a low-frequency capacitor at RF because its capacitance value is correct.
Component boundary
Use frequency-specific ratings and the exact topology, material, geometry, load, power, duty cycle, and cooling. Begin at low power and stop for heating, odor, arcing, distortion, or unstable measurements.
