resonating cavity

resonating cavity

[′rez·ən‚ād·iŋ ′kav·əd·ē] (electromagnetism) Short piece of waveguide of adjustable length, terminated at either or both ends by a metal piston, an iris diaphragm, or some other wave-reflecting device; it is used as a filter, as a means of coupling between guides of different diameters, and as impedance networks corresponding to those used in radio circuits.