Plain-language answer: A coupling loop is a smaller loop placed near a resonator or antenna to exchange energy through magnetic coupling.
Why the real component differs from the ideal
Its area, position, orientation, conductor, feed impedance, and spacing control the match without necessarily changing the main resonator length.
What to verify
Begin with the documented geometry, tune the resonator first where instructed, then adjust coupling at low power while watching bandwidth and symmetry.
The common mistake
Changing loop size and resonator tuning at the same time.
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.
