Numerical and Experimental Investigation on Quality Factors of Coplanar Waveguide Resonators

Xiangying WU  Ikuo AWAI  

IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.12   pp.1923-1929
Publication Date: 2000/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
CPW resonators,  SIR structure,  quality factor,  field decay method,  FDTD modeling of conductor loss,  

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Several types of coplanar waveguide (CPW) resonator are analyzed by use of the field decay method based on the FDTD algorithm in this paper. Quality (Q) factors of a CPW resonator, including radiation Q, conductor Q, dielectric Q and unloaded Q, are investigated thoroughly. A new procedure to calculate conductor Q is proposed. Some CPW resonators are fabricated and measured in order to validate the analysis method. It is shown that radiation from a CPW resonator can be reduced by means of the stepped impedance technique. It is also seen that miniaturization of CPW resonators can be realized if the stepped impedance structure is adopted.