Characteristics of the wavegude to quasioptical or dielectric resonator couplings

Abstract

Introduction.Open resonators find many applications in the measuring techniques and millimeter wave devices. In particular, these are quasioptical (two-reflector) resonators (QR) with metal reflectors and whispering gallery mode dielectric resonators (DR). The coupling of the transmission line and open resonator differs from such coupling of the transmission line and closed resonating structure by the presence of direct coupling with free space. Therefore diffraction of the field of an eigenmode on the coupling elements results not only in the radiation of the stored energy to the transmission line, but also in the scattering of energy to the free space. Thus, the losses, which the coupling element inserts to the resonator, consist of so-called external losses ex