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Accurate circuit models of CPW coupling elements for the design of compact quarter‐wavelength band‐pass filters
Author(s) -
Gao Jing,
Zhu Lei
Publication year - 2004
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20033
Subject(s) - passband , coplanar waveguide , electronic engineering , equivalent circuit , coupling (piping) , topology (electrical circuits) , balun , microwave , band pass filter , capacitive sensing , bandwidth (computing) , capacitive coupling , discontinuity (linguistics) , engineering , physics , electrical engineering , voltage , telecommunications , mathematics , antenna (radio) , mathematical analysis , mechanical engineering
Accurate equivalent‐circuit models of several types of coplanar waveguide (CPW) coupling elements are presented and their parameters are derived by employing the so‐called short‐open calibration (SOC) technique into the full‐wave method of moments (MoM). Our brief description is firstly made on the formulation of this MoM‐SOC for modeling a generalized two‐port CPW discontinuity in terms of its circuit network, that is, the Z ‐ or Y ‐matrix. Afterwards, three sets of J ‐ or K ‐inverter parameters versus frequency are extracted and obtained in order to demonstrate the comparative coupling degree of lumped‐capacitive and inductive gap‐coupling, as well as distributed overlapped‐coupling, structures. Next, these coupling elements are utilized together in the design of compact quarter‐wavelength CPW band‐pass filters via a simple cascaded network topology. Our optimized results are reasonably validated by ADS simulation and both exhibit good passband behavior with broadened bandwidth of more than 20% at 5.8 GHz and an ultra‐broad upper stop‐band of 6.4 to 15.9 GHz. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14: 453–461, 2004.