Parameter extraction of interdigital slow-wave coplanar waveguide circuits using finite difference frequency domain algorithm
- 26 March 2008
- journal article
- research article
- Published by Hindawi Limited in International Journal of RF and Microwave Computer-Aided Engineering
- Vol. 18 (3), 250-259
- https://doi.org/10.1002/mmce.20284
Abstract
The slow wave effect can be obtained by a capacitively loaded structure with a symmetrical interdigital line connected on both sides of the coplanar waveguide (CPW) central line. The ferroelectric thin film with high dielectric constant can reduce the size of circuit and make it possible to realize tunable devices such as filter by applying voltage on it. Actually, this kind of slow wave structure is a periodic guided‐wave structure and can be analyzed by using classic finite difference frequency domain (FDFD) method for periodic guided‐wave structures. However, the very compact slow‐wave structures will usually result in simulation errors when the classic FDFD method is adopted, which will lead to a nonsymmetrical generalized eigenvalue problem. In this article, the shift‐and‐invert (SI) Arnoldi method is used to directly resolve this nonsymmetrical generalized eigenvalue problem. As a result, the accuracy of FDFD algorithm is improved. Especially for the large scale eigenvalue problem, SI method can also have a very fast speed of calculation. By means of its complex propagation constant obtained from simulation, one can extract circuit parameters of the interdigital capacitor. Consequently, one can analyze and design relevant resonators and filters in a quick and accurate manner, which are constructed with such interdigital slow wave structures. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008.Keywords
This publication has 19 references indexed in Scilit:
- Finite-difference frequency-domain algorithm for modeling guided-wave properties of substrate integrated waveguideIEEE Transactions on Microwave Theory and Techniques, 2003
- A full-wave analysis of interdigital capacitors for planar integrated circuitsIEEE Transactions on Magnetics, 2003
- A novel superconducting CPW slow‐wave bandpass filterMicrowave and Optical Technology Letters, 2002
- Accurate circuit model of interdigital capacitor and its application to design of new quasi-lumped miniaturized filters with suppression of harmonic resonanceIEEE Transactions on Microwave Theory and Techniques, 2000
- Characteristics of periodically loaded CPW structuresIEEE Microwave and Guided Wave Letters, 1998
- On restarting the Arnoldi method for large nonsymmetric eigenvalue problemsMathematics of Computation, 1996
- Automatic derivation of equivalent circuits for general microstrip interconnection discontinuitiesIEEE Transactions on Microwave Theory and Techniques, 1996
- CAD models for multilayered substrate interdigital capacitorsIEEE Transactions on Microwave Theory and Techniques, 1996
- Millimetre-wave coplanar waveguide slow wave transmission lines on InPElectronics Letters, 1996
- Interdigital Capacitors and Their Application to Lumped-Element Microwave Integrated CircuitsIEEE Transactions on Microwave Theory and Techniques, 1970