10. Glossary

Frequency tuning

A change in the resonance frequency of a few percent around a central value.

Microwave cavity

A rectangular, cylindrical, or spherical cavity with metal walls, having natural resonance modes determined by the cavity's dimensions.

Photonic crystals

Periodic structures of two dielectrics.

Quality factor

Ratio of stored energy to dissipated energy.

Metamaterials

Materials with negative refractive indices created from periodic arrays of resonant structures (dielectric resonators, metal wires, split metal rings).

Dual or triple modes

Degenerate propagation modes of order 2 or 3 in which the electromagnetic...