Direct electromagnetic optimization of microwave filters

Bila, Stéphane; Baillargeat, Dominique; Aubourg, Michel; Verdeyme, Serge; Guillon, P.; Seyfert, Fabien; Grimm, José; Baratchart, Laurent; Zanchi, C.; Sombrin, J.

doi:10.1109/6668.918262

Cited by 63 publications

(28 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a result, the prototype response is a rational function in terms of a common complex frequency variable s. These approximations are valid for narrowband applications, where a constant coupling matrix completely defines the prototype and the real filter behavior [5]. Exploiting the coupling matrix or equivalent schemes, very powerful synthesis and design methods of narrowband filters have been developed (see [12], [13], [15], [47] and [48] to cite a few). However, as the filter bandwidth increases, the accuracy of the previous methods is seriously reduced.…”

Section: Circuit Synthesis Of Wideband and Inhomogeneous Inductimentioning

confidence: 99%

“…This classic procedure consists of the three following steps: first, starting from wellknown mathematical models, an equivalent circuit prototype (either based on lumped and/or distributed elements) is synthesized [11]; second, after identifying the prototype elements with real structure parts, initial estimates for the physical dimensions are obtained [12], [13]; and third, a final optimization of the filter dimensions is typically performed [14]- [16]. The success of this design procedure is based on the similarities between the equivalent circuit prototype and the real filter structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distributed Models for Filter Synthesis

2011

View full text Add to dashboard Cite

show abstract

Section: Circuit Synthesis Of Wideband and Inhomogeneous Inductimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distributed Models for Filter Synthesis

2011

View full text Add to dashboard Cite

show abstract

“…The model is very often specified in a form of a coupling matrix. This approach has been proven to be very powerful [24][25][26][27] but its success depends on the process of extracting the coupling matrix from electromagnetic simulations. Unfortunately, this CAD methodology cannot be applied for the filters considered in this paper, since all coupling matrix extraction schemes assume that the coupling coefficient is frequency-independent.…”

Section: Introductionmentioning

confidence: 99%

Zero-Pole Approach to Computer Aided Design of in-Line Siw Filters With Transmission Zeros

Jedrzejewski¹,

Leszczynska²,

Szydlowski³

et al. 2012

PIER

View full text Add to dashboard Cite

Abstract-This paper presents a design of a new type of in-line pseudo-elliptic filters implemented in substrate integrated waveguide (SIW) technology. To realize transmission zeros in in-line topology, frequency-dependent couplings were used. Such dispersive couplings were implemented as shorted stubs. The design process starts with the generation of a suitable starting point. To this end, an approximation of SIW as a rectangular waveguide is used and a fast electromagnetic solver based on mode-matching technique is utilized (µWave Wizard). The next step is the optimization process of a filter in a full-wave 3D EM simulator Ansoft HFSS. The Optimization routine employs a cost function involving zeros and poles of the rational functions approximating scattering parameters. To increase the speed of convergence, a built-in derivative calculation feature was used and zeros and poles and their derivatives with respect to design parameters were extracted using the vector fitting algorithm. Experimental validation of the method is demonstrated by a third-order filter with asymmetric response and a fifth-order filter with two transmission zeros in addition to an asymmetric response. The experimental results show good agreement between the simulated and measured data.

show abstract

“…Finally, the proposed approach is also consistent with numerical modelling techniques which are often used by designers. These methods are used along with a coupling matrix extraction algorithm [10]- [13]: this allows driving the tuning process, so as to converge towards a device implementing the ideal coupling matrix. Nevertheless, when working with topologies which admit multiple solutions, the latter coupling matrix extraction step returns a list of several equivalent coupling matrices.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and design of asymmetrical dual-band bandpass filters based on equivalent network simplification

Lenoir¹,

Bila²,

Seyfert

et al. 2006

IEEE Trans. Microwave Theory Techn.

Self Cite

View full text Add to dashboard Cite

-Although the synthesis of symmetrical dual-band bandpass filters has been studied in the literature, very little seems to be known about the general asymmetrical case. In this paper, a procedure for the synthesis of asymmetrical dual-band bandpass filters implemented with in-line dual-mode cavities is proposed. The latter starts with the determination of a filtering characteristic fulfilling the electrical specifications in the spectral domain by means of an optimization scheme. As to the coupling topology, the in-line architecture that is intended for the hardware realisation, as well as the asymmetrical nature of the response, lead naturally to the choice of an extended box topology or its variants. It was recently shown that these topologies possess the property of multiple solutions, meaning that the related coupling matrix synthesis problem admits several solutions. On one hand, this multiplicity offers some additional flexibility to the designer, but on the other hand, working with multiple solutions may lead to ambiguities during the tuning process. Our procedure takes the best of both worlds : after an exhaustive synthesis step yielding a list of equivalent coupling matrices, simplifications of the original topology are obtained by cancelling some particular couplings. The locations of cancelled couplings are chosen so as to preserve the electrical response and to provide some important hardware simplifications. It is also shown that the resulting simplified coupling topology no longer has the multiple solution property, solving ambiguity problems that might occur during the tuning step. The procedure is demonstrated on two examples of 11-pole asymmetrical dual-band bandpass filters. A numerical model driven by a coupling matrix extraction process is used to determine the geometrical dimensions. Finally an experimental prototype is built in order to validate our design approach.

show abstract

Direct electromagnetic optimization of microwave filters

Cited by 63 publications

References 7 publications

Distributed Models for Filter Synthesis

Distributed Models for Filter Synthesis

Zero-Pole Approach to Computer Aided Design of in-Line Siw Filters With Transmission Zeros

Synthesis and design of asymmetrical dual-band bandpass filters based on equivalent network simplification

Contact Info

Product

Resources

About