Title :
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
fDate :
6/1/1999 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
