Design and Diagnosis of Wideband Coupled-Resonator Bandpass Filters

A method for circuit elements parameter extraction of wideband filters from their electromagnetic (EM) simulated response is presented. A combline-like resonator for filter realization is introduced. Several possible electric and magnetic coupling structures are investigated. The equivalent lumped e...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2012-05, Vol.60 (5), p.1266-1277
Main Authors: Hong-Ming Lee, Zaki, K. A., Atia, A. E., Piloto, A. J.
Format: Article
Language:English
Subjects:
Admittance
Admittance/impedance matrix
Applied sciences
Biological and medical sciences
Capacitors
Circuit properties
circuit tuning
Circuits
Computer simulation
Computerized, statistical medical data processing and models in biomedicine
Couplings
Dielectric, amorphous and glass solid devices
Electric filters
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Extraction
Inductors
Joining
Magnetic devices
Magnetic resonance
Mathematical models
Medical management aid. Diagnosis aid
Medical sciences
Oscillators, resonators, synthetizers
parameter extraction
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Studies
wide bandpass filters
Wideband
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Summary:A method for circuit elements parameter extraction of wideband filters from their electromagnetic (EM) simulated response is presented. A combline-like resonator for filter realization is introduced. Several possible electric and magnetic coupling structures are investigated. The equivalent lumped element circuit has electric and magnetic couplings modeled by capacitors and inductors instead of frequency-independent reactance or impedance inverters. The parameter extraction method of direct-coupled-resonator filters is developed and is applied to symmetric canonical filters. For filters with nonadjacent spurious couplings, optimization is used to extract the lumped element parameters to reproduce the EM simulated response. Excellent agreement between the EM simulation, lumped elements extracted responses and measurements is obtained. Filter synthesis is carried out by an optimization process. Several filter designs are presented to illustrate the design procedure and validate the circuit modeling. Measured results of an eight-pole filter verified the design process.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2012.2187064