Speaker
Description
There have been concerns regarding the uncertainties of Q-factor measurements in vertical test system when the coupling beta is too low or too high. Forward and reverse power readings can be affected by cross-contamination in the bidirectional coupler and by re-reflection from the circulator, resulting in increased measurement uncertainty. This uncertainty becomes more significant when the cavity is far from critical coupling, because the dissipated power is determined from the difference between the forward, reverse, and transmitted powers.
To address this issue, we are recently developing a new method for measuring the coupling factor, β, based on the emitted power ratio between the input coupler and the pickup coupler. When the coupler geometry is mechanically fixed, the external quality factors (Q_e,Q_t) of each coupler remains constant. During cavity field decay, the emitted power ratio of the reverse power, P_r, and the pickup power, P_t, remains constant. this emitted power ratio makes it possible to calculate the coupling factors of both couplers with the transfer function.
This method reduces the sensitivity of coupling-factor measurements to RF power measurement errors. Simulink simulations were performed to evaluate the validity and accuracy of the proposed method. The Simulink model provides improved understanding and quantitative evaluation of measurement uncertainties in the vertical test system.
| Paper status | Proceeding files received |
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