Loop coupled microwave cavity

摘要

A loop coupled microwave cavity, which uses a cylindrical cavity as the main body and has a lock hole on the top of the cavity in order to connect to a loop-coupling end formed by bending the long pin of an SMA connector. The long pin of the SMA extends into the cavity through the lock hole so that the top end of the long pin will touch the inner wall of the cavity to receive a microwave signal in TM012 mode to excite the cavity. On the other hand, the coaxial structure formed by the long pin and the lock hole is a quarter-wavelength transformer, so the SMA connector has both loop coupling and impedance transforming functions to increase the Q factor of the cavity. A diminutive sample is inserted into the cavity to perform the cavity perturbation method (CPM).