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Diagnosis of lossy resonator filters with source–Load coupling using Y ‐parameters
Author(s) -
Wang Rui,
Li LeZhong,
Peng Long
Publication year - 2014
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.20816
Subject(s) - resonator , band pass filter , admittance , admittance parameters , coupling (piping) , filter (signal processing) , coupling coefficient of resonators , lossy compression , waveguide filter , acoustics , m derived filter , q factor , electronic engineering , materials science , physics , electrical impedance , prototype filter , filter design , computer science , engineering , optoelectronics , electrical engineering , voltage , artificial intelligence , metallurgy
This article presents a novel approach to extract the coupling matrix (CM) of a lossy cross‐coupled resonator bandpass filter with source–load coupling using admittance parameters (also known as Y ‐parameters). The Y ‐parameters are calculated by characteristic polynomials corresponding to the measured S ‐parameters. The unloaded quality factor of resonators and the CM can be extracted from the Y ‐parameters. The method allows one to diagnose a filter with source–load coupling without necessity of dealing with the degenerate poles problem of the Y ‐parameters and the measurement noise. The proposed diagnosis method can be used in a filter tuning and speeds up its physical realization. The method is verified by a fabricated fourth‐order bandpass filter and a simulated substrate integrated waveguide dual‐mode filter with source–load couplings. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:713–717, 2014.
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