RESONANT REFLECTORS FOR FREE-ELECTRON MASERS

A new type of a waveguide reflector is discussed. Its operating princi ple is based on the effect of resonant reflection of a wave from a cav ity when there is coupling between the wave and an eigenmode of the ca vity. The resonant reflectors are very attractive for the use in micro wave systems of free electron masers due to their high reflection coef ficients and narrow frequency bands at comparatively short lengths. Re sults of calculations and measurements of some resonant reflectors and a microwave system for KA-band cyclotron autoresonance masers are pre sented.