Q-factor measurements of open resonators in the millimeter-wave range including coupling losses

Author

Faby, G. ; Schünemann, K.

Author_Institution

Tech. Univ. Hamburg-Harburg, Germany

Volume

48

Issue

3

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

688

Lastpage

692

Abstract

The unloaded quality factor as well as the coupling coefficient of open resonators are determined by evaluating measured complex reflection coefficients. The cavity is described by an equivalent circuit, the parameters of this circuit are calculated by means of a least-square fit of the simulated to the measured reflection coefficients. The solution is obtained using the Householder-algorithm, which promises very fast and stable computation. This approach is capable of evaluating quality-factor measurements for each type of resonator, even with losses in the coupling aperture. Its validity is illustrated by measurements in the cm- and mm-wave range

Keywords

Q-factor measurement; S-parameters; cavity resonators; electromagnetic coupling; equivalent circuits; frequency response; least squares approximations; millimetre wave measurement; optical resonators; reflectometry; EM coupling; Householder-algorithm; MM-wave range; Q-factor measurements; circuit modelling; complex reflection coefficients; coupling coefficient; coupling losses; equivalent circuit; fast stable computation; frequency response; least-square fit; lossy circuits; open resonators; phase variations; quasi-optical resonators; scattering parameters; unloaded quality factor; Apertures; Circuit simulation; Computational modeling; Coupling circuits; Equivalent circuits; Loss measurement; Millimeter wave circuits; Millimeter wave measurements; Q factor; Reflection;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.772197

Filename

772197