Extraction of coupling parameters for microwave filters: determination of a stable rational model from scattering data

Seyfert, Fabien; Baratchart, Laurent; Marmorat, Jean-Paul; Bila, Stéphane; Sombrin, J.

doi:10.1109/mwsym.2003.1210875

Cited by 30 publications

(20 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each path is represented by a parallel LC circuit sandwiched between two admittance inverters. It is straightforward to show that the admittance parameters seen by the source and load in this circuit are identical to the expansion in (2).…”

Section: Global Eigenresonance Representation Of Ssl Filtersmentioning

confidence: 82%

See 1 more Smart Citation

Modeling and Optimization of Compact Microwave Bandpass Filters

Bekheit

Amari

Menzel

2008

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

Abstract-This paper presents the modeling and optimization of compact microwave bandpass filters whose compactness leads to complex and strong stray coupling paths, thereby making the identification of a simple and sparse coupling topology difficult and even impossible. The strong coupling coefficients needed for a broadband response can also cause an ambiguity in identifying the spatial extent of local resonances. An equivalent circuit, which is extracted directly from Maxwell's equations, is used in optimizing these filters. The filter is represented by its global resonances instead of individual resonators. The extraction of the parameters of the equivalent circuit is carried out in the physical frequency and not in the normalized frequency in order to preserve the physicality of the equivalent circuit, especially for asymmetric responses. The technique is successfully applied to the optimization of secondorder suspended stripline bandpass filters with one transmission zero either below or above the passband, as well as fourth-order filters with three transmission zeros. A fourth-order filter with three transmission zeros is fabricated and measured.

show abstract

Section: Global Eigenresonance Representation Of Ssl Filtersmentioning

confidence: 82%

“…Its off-diagonal elements are the frequency independent coupling coefficients between the different resonators and between the ports and resonators. A comprehensive solution to the problem of extracting the elements of the coupling matrix with a desired topology to reproduce a prescribed response is now known [2].…”

mentioning

confidence: 99%

Modeling and Optimization of Compact Microwave Bandpass Filters

Bekheit

Amari

Menzel

2008

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Full 3-D EM calculations are done in order to find the whole filter dimensions and thus to optimize its response in order to match the matrix (1) defined in Section II-D. The optimization procedure follows a loop that compares the values of the objective coupling matrix and those of the identified one (extracted from the EM simulated S parameters done at each optimization iteration) in order to change the necessary dimensions of the cavities, the coupling parts or even the dimensions of the excitation system [10]. In the optimization procedure, each iteration takes about 30 minutes whereas 30 iterations are approximately needed to converge toward the objective response of the filter.…”

Section: F Electromagnetic Simulationsmentioning

confidence: 99%

Quasi-Elliptic and Chebyshev Compact LTCC Multi-Pole Filters Functioning in the Submillimetric Wave Region at 150 GHz

Khalil¹,

Passerieux²,

Baillargeat³

et al. 2010

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

This paper proposes, for the first time to the best of our knowledge, two challenging LTCC multi-pole bandpass filters operating at 150 GHz for radioastronomy applications. Low-temperature co-fired ceramic (LTCC) technology is employed to realize these filters because it assures the high precision and compactness needed at this high frequency. The two filters are optimized by 3-D electromagnetic simulations and are validated by experimental results. Different positive and negative couplings, which are achieved by different coupling apertures, are studied. The five-pole Chebyshev filter has 8.4 dB of insertion loss in a 1.31% fractional bandwidth for 6.7 mm 2.45 mm lateral dimensions. The fourpole quasi-elliptic filter is conceived to decrease insertion loss by decreasing the number of resonant cavities while conserving the same selectivity by introducing two transmission zeros around the passband. Beside 5.5 dB of insertion loss, this filter occupies a more compact circuit area (3.32 mm 2.37 mm) and insures a very good spurious free region (16 GHz) around 150 GHz. Experimental results are in good agreement with the theoretical ones and validate the use of LTCC technology at such high frequencies over 100 GHz.

show abstract

“…The electromagnetic model Fig. 9 is designed using IMS 2010 Microwave Wizard and tuned by coupling matrix identification [6], S parameters obtained from EM model shown in Fig. 7 Similarly for channel 2 the tuned EM model of the filter is obtained Fig.…”

Section: B Antennamentioning

confidence: 99%

A simplified methodology for matched filter design with constraints - filter-antenna subsystem for space application

Naeem

Bila

Verdeyme

et al. 2010

2010 IEEE MTT-S International Microwave Symposium

Self Cite

View full text Add to dashboard Cite

A new simplified methodology for the design of microwave cavity filters has been presented. The presented work is based on the optimization of Belevitch polynomials and inspired from the Simplified Real Frequency Te chnique (SRFT).One can bypass the use of computationally expensive circuit simulation softwares which are used to optimize the lumped element circuit model of the cavity filters. The procedure is applied for the design of filters for a multi-feed filter-antenna subsystem for space application.

show abstract

Extraction of coupling parameters for microwave filters: determination of a stable rational model from scattering data

Cited by 30 publications

References 7 publications

Modeling and Optimization of Compact Microwave Bandpass Filters

Modeling and Optimization of Compact Microwave Bandpass Filters

Quasi-Elliptic and Chebyshev Compact LTCC Multi-Pole Filters Functioning in the Submillimetric Wave Region at 150 GHz

A simplified methodology for matched filter design with constraints - filter-antenna subsystem for space application

Contact Info

Product

Resources

About