Accurate characterization of low-Q microwave resonator using critical-points method

Author

Wang, Peng ; Chua, Lye Heng ; Mirshekar-Syahkal, Dariush

Author_Institution

Dept. of Electron. Syst. Eng., Univ. of Essex, Colchester, UK

Volume

53

Issue

1

fYear

2005

Firstpage

349

Lastpage

353

Abstract

The critical-points method for direct characterization of high-Q microwave resonators is adapted to low-Q resonators. Based on a new approximation, the crossover points are removed and the critical points are used in the computation of the equivalent-circuit elements for the low-Q resonator. Due to the large separation of the crossover frequencies from the resonant frequency, the modification is necessary in order to have a good estimate of the element values in the equivalent circuit. The high accuracy of this one-port measurement method is verified using a microstrip patch antenna.

Keywords

Q-factor; equivalent circuits; microstrip antennas; microstrip resonators; critical points method; crossover frequencies; crossover points; equivalent circuit elements; high-Q microwave resonators; low-Q microwave resonator; microstrip patch antenna; one-port measurement method; resonant frequency; Antenna measurements; Coupling circuits; Equivalent circuits; Frequency estimation; Impedance; Microstrip antennas; Microwave circuits; Microwave theory and techniques; Patch antennas; Resonant frequency;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2004.839931

Filename

1381708