A highly accurate measurement of resonator Q -factor and resonance frequency

B. Gyüre-Garami, O. Sági, B. G. Márkus, F. Simon

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The microwave cavity perturbation method is often used to determine material parameters (electric permittivity and magnetic permeability) at high frequencies, and it relies on the measurement of the resonator parameters. We present a method to determine the Q-factor and resonance frequency of microwave resonators which is conceptually simple but provides a sensitivity for these parameters which overcomes those of existing methods by an order of magnitude. The microwave resonator is placed in a feedback resonator setup, where the output of an amplifier is connected to its own input with the resonator as a bandpass filter. After reaching steady-state oscillation, the feedback circuit is disrupted by a fast microwave switch, and the transient signal, which emanates from the resonator, is detected using down-conversion. The Fourier transform of the resulting time-dependent signal yields directly the resonance profile of the resonator. Albeit the method being highly accurate, this comes with a conceptual simplicity, ease of implementation, and lower circuit cost. We compare existing methods for this type of measurement to explain the sensitivity of the present technique, and we also make a prediction for the ultimate accuracy for the resonator Q and f0 determination.

Original languageEnglish
Article number113903
JournalReview of Scientific Instruments
Volume89
Issue number11
DOIs
Publication statusPublished - Nov 1 2018

Fingerprint

Q factors
Resonators
resonators
Microwave resonators
microwaves
Microwaves
Feedback
Magnetic permeability
Networks (circuits)
feedback circuits
Bandpass filters
sensitivity
Fourier transforms
Permittivity
bandpass filters
Switches
permeability
switches
amplifiers
permittivity

ASJC Scopus subject areas

  • Instrumentation

Cite this

A highly accurate measurement of resonator Q -factor and resonance frequency. / Gyüre-Garami, B.; Sági, O.; Márkus, B. G.; Simon, F.

In: Review of Scientific Instruments, Vol. 89, No. 11, 113903, 01.11.2018.

Research output: Contribution to journalArticle

Gyüre-Garami, B. ; Sági, O. ; Márkus, B. G. ; Simon, F. / A highly accurate measurement of resonator Q -factor and resonance frequency. In: Review of Scientific Instruments. 2018 ; Vol. 89, No. 11.
@article{bd0e583a0bc64e5aab4c1199d70f29c1,
title = "A highly accurate measurement of resonator Q -factor and resonance frequency",
abstract = "The microwave cavity perturbation method is often used to determine material parameters (electric permittivity and magnetic permeability) at high frequencies, and it relies on the measurement of the resonator parameters. We present a method to determine the Q-factor and resonance frequency of microwave resonators which is conceptually simple but provides a sensitivity for these parameters which overcomes those of existing methods by an order of magnitude. The microwave resonator is placed in a feedback resonator setup, where the output of an amplifier is connected to its own input with the resonator as a bandpass filter. After reaching steady-state oscillation, the feedback circuit is disrupted by a fast microwave switch, and the transient signal, which emanates from the resonator, is detected using down-conversion. The Fourier transform of the resulting time-dependent signal yields directly the resonance profile of the resonator. Albeit the method being highly accurate, this comes with a conceptual simplicity, ease of implementation, and lower circuit cost. We compare existing methods for this type of measurement to explain the sensitivity of the present technique, and we also make a prediction for the ultimate accuracy for the resonator Q and f0 determination.",
author = "B. Gy{\"u}re-Garami and O. S{\'a}gi and M{\'a}rkus, {B. G.} and F. Simon",
year = "2018",
month = "11",
day = "1",
doi = "10.1063/1.5050592",
language = "English",
volume = "89",
journal = "Review of Scientific Instruments",
issn = "0034-6748",
publisher = "American Institute of Physics Publising LLC",
number = "11",

}

TY - JOUR

T1 - A highly accurate measurement of resonator Q -factor and resonance frequency

AU - Gyüre-Garami, B.

AU - Sági, O.

AU - Márkus, B. G.

AU - Simon, F.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - The microwave cavity perturbation method is often used to determine material parameters (electric permittivity and magnetic permeability) at high frequencies, and it relies on the measurement of the resonator parameters. We present a method to determine the Q-factor and resonance frequency of microwave resonators which is conceptually simple but provides a sensitivity for these parameters which overcomes those of existing methods by an order of magnitude. The microwave resonator is placed in a feedback resonator setup, where the output of an amplifier is connected to its own input with the resonator as a bandpass filter. After reaching steady-state oscillation, the feedback circuit is disrupted by a fast microwave switch, and the transient signal, which emanates from the resonator, is detected using down-conversion. The Fourier transform of the resulting time-dependent signal yields directly the resonance profile of the resonator. Albeit the method being highly accurate, this comes with a conceptual simplicity, ease of implementation, and lower circuit cost. We compare existing methods for this type of measurement to explain the sensitivity of the present technique, and we also make a prediction for the ultimate accuracy for the resonator Q and f0 determination.

AB - The microwave cavity perturbation method is often used to determine material parameters (electric permittivity and magnetic permeability) at high frequencies, and it relies on the measurement of the resonator parameters. We present a method to determine the Q-factor and resonance frequency of microwave resonators which is conceptually simple but provides a sensitivity for these parameters which overcomes those of existing methods by an order of magnitude. The microwave resonator is placed in a feedback resonator setup, where the output of an amplifier is connected to its own input with the resonator as a bandpass filter. After reaching steady-state oscillation, the feedback circuit is disrupted by a fast microwave switch, and the transient signal, which emanates from the resonator, is detected using down-conversion. The Fourier transform of the resulting time-dependent signal yields directly the resonance profile of the resonator. Albeit the method being highly accurate, this comes with a conceptual simplicity, ease of implementation, and lower circuit cost. We compare existing methods for this type of measurement to explain the sensitivity of the present technique, and we also make a prediction for the ultimate accuracy for the resonator Q and f0 determination.

UR - http://www.scopus.com/inward/record.url?scp=85057781570&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057781570&partnerID=8YFLogxK

U2 - 10.1063/1.5050592

DO - 10.1063/1.5050592

M3 - Article

C2 - 30501306

AN - SCOPUS:85057781570

VL - 89

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

SN - 0034-6748

IS - 11

M1 - 113903

ER -