Published 12 issues per year
ISSN Print: 0040-2508
ISSN Online: 1943-6009
Indexed in
Properties of a Quasi-Optical Resonator with Local Coupling Elements. I. Phenomenological Model
ABSTRACT
Devices used widely to connect open resonators to hollow waveguides are local coupling elements with wide beams; in this case energy transmitted through a coupling element is radiated into free space and does not participate in generating resonance oscillations in the open resonator [2]. Sometimes this radiation is called a "nonresonant background." Approximate theoretical estimates of the energy of such radiation are given in [2-4], while experimental measurements are described in [5]. In some papers concerned with coupling of open resonators to rectangular waveguides through a small aperture in the diaphragm or through the open end of the waveguide (e.g., see [6, 7]), it is assumed that the "nonresonant" background is negligibly small. However, direct measurements [8, 9] show that this background can be of the same order of magnitude as the natural losses in the waveguide.