Open resonators (OR) are one of basic elements of modern systems and devices of millimeter and submillimeter wavelength ranges. The information about OR resonance frequency and Q-factor which can be received as the results of experimental investigations is necessary for their effective use. Asymmetrical character of reflection behavior for significant "not resonance" (radiation) losses in the coupling port makes impossible determination of resonance frequency and the loaded Q-factor of OR excited oscillation using traditional methods. A direct coupling of resonance field and free space sets the certain restrictions [1] on the use in OR the methods and principles, that have been developed for investigation of electromagnetic oscillations in cavities (Slater's theorem). Indeed, the one-port network presentation of the coupling OR, and processing of the measurements of complex reflection coefficient by linear-fractional approximation allows one to determine oscillation parameters of single resonance in open resonance systems at presence of radiation losses in coupling ports [2].
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