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Marco Guglielmi - One of the best experts on this subject based on the ideXlab platform.

  • Multimode Equivalent Networks for Shielded Microwave Circuits With Thick Metallizations
    IEEE Transactions on Microwave Theory and Techniques, 2020
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Vicente E Boria, Stephan Marini, Marco Guglielmi
    Abstract:

    In this article, we show how the multimode Equivalent Network (MEN) technique can be extended to the analysis of multilayer boxed planar microwave circuits that are built using a thick metallization. This analysis is carried out considering the thick metallic circuit as a length of the uniform waveguide. The problem is then divided into two waveguide steps (or junctions). We first obtain the Equivalent Network of the two junctions. Then, we cascade them to obtain the MEN of the complete circuit, thereby including the effect of finite thickness rigorously. A key aspect of the formulation that we propose is that it includes ports in the transverse plane of the circuit. In addition to theory, several shielded microwave filters using a thick metallization are also analyzed. An in-depth study of the numerical convergence is also performed for two practical examples. Simulation results are shown to be in good agreement with both commercial simulation tools and measurements, thereby fully validating our theoretical formulation.

  • On Multimode Equivalent Network Representation of Finite Arrays of Open-Ended Waveguides
    IEEE Transactions on Antennas and Propagation, 2017
    Co-Authors: Daniel Sanchez-escuderos, Vicente E Boria, Mariano Baquero-escudero, Pablo Soto, Marco Guglielmi
    Abstract:

    This communication describes a multimode Equivalent Network (MEN) representation of a finite array of open-ended lossless waveguides on an infinite ground plane. The derivation is based on an integral equation formulated at the interface between the waveguides and the free-space region. The MEN is formulated using the concept of accessible and localized modes, and includes ports for the free-space plane waves. The MEN derived can be easily combined with the MENs of other microwave components, thus allowing for the accurate analysis and design of more complex systems composed of waveguide elements and radiating apertures. Both simulated and experimental results are presented showing a very good agreement, thereby fully validating the proposed Equivalent Network representation.

  • Encyclopedia of RF and Microwave Engineering - Multimode Equivalent Network Representations
    Encyclopedia of RF and Microwave Engineering, 2005
    Co-Authors: Marco Guglielmi
    Abstract:

    The objective of this article is to describe the formulation of multimode Equivalent Network representations of waveguide junctions. Both planar and arbitrary junctions are discussed, thereby covering essentially all possible cases of engineering interest for microwave and millimeter-wave applications. The theory presented in this article effectively transforms complex field problems into linear algebraic problems of simple solution. The theory described is rigorous and computationally very efficient and can therefore be used as a very solid theoretical frame for the development of advanced full-wave electromagnetic simulation computer programs. In addition to theory, a number of applications are also demonstrated showing very good agreement between measured and simulated performances, thereby fully validating the theory presented. Keywords: multimode Equivalent Networks; waveguide discontinuities; integral equations; waveguides; junctions

  • Multimode Equivalent Network representation for the Y-junction of rectangular waveguides
    IEE Proceedings - Microwaves Antennas and Propagation, 1997
    Co-Authors: Benito Gimeno, Marco Guglielmi
    Abstract:

    Symmetrical Y-junctions in rectangular waveguides are commonly used components in microwave subsystems. The authors describe an alternative multimode Equivalent Network representation for this junction in terms of multimode admittance coupling matrices. The elements of the admittance coupling matrix are obtained as a summation of geometrical coefficients which are independent from either the frequency or the specific waveguide dimensions so that they need to be evaluated only once. The general formulations are described together with the detailed derivation for the E- and H-plane cases. Finally, comparisons between the authors' simulations and both measured and theoretical data are presented, fully validating the Networks derived.

  • Multimode Equivalent Network representation of inductive and capacitive multiple posts
    IEE Proceedings - Microwaves Antennas and Propagation, 1995
    Co-Authors: Marco Guglielmi, G. Gheri
    Abstract:

    Novel multimode Equivalent Network representations for multiple inductive and capacitive posts in rectangular waveguides are presented. The Network representations art derived from a rigorous formulation that leads to frequency independent integral equations. The Network representations developed are used to compute the response of several waveguide devices, and comparisons between measured and simulated performances are also included, showing very good agreement up to millimetre-wave frequencies. >

Henri Baudrand - One of the best experts on this subject based on the ideXlab platform.

  • Equivalent Network representation of boundary conditions involving generalized trial quantities application to lossy transmission lines with finite metallization thickness
    IEEE Transactions on Microwave Theory and Techniques, 1997
    Co-Authors: Farid Bouzidi, Damienne Bajon, Hervé Aubert, Henri Baudrand
    Abstract:

    The derivation of integral equations for solving boundary conditions by mere application of analog Kirchhoff's and Ohm's laws is used. Generalized trial quantities are introduced as virtual adjustable sources in the Equivalent Network representation of boundary conditions. The lossy conductor domain of a planar transmission line is represented by a particular two-port. Thus, metallic losses can be evaluated for any metallization thickness without restricting the conductor modeling to a simple surface impedance approximation. In this paper, this two-port model is discussed and numerical results relative to a lossy coplanar waveguide (CPW) are presented. These results are in very good agreement with those obtained from the mode-matching technique and with other experimental data available in the literature. The size of matrices involved in the calculation of losses is twice as large as that in the lossless case. Moreover, the authors' formulation can be easily applied to superconducting planar transmission lines.

  • Equivalent Network representation of boundary conditions involving generalized trial quantities
    Annales Des Télécommunications, 1997
    Co-Authors: Henri Baudrand, Hervé Aubert, Damienne Bajon, Farid Bouzidi
    Abstract:

    Virtual adjustable sources are introduced in Equivalent Network representation of boundary conditions. For this purpose, integral equations are to be solved simple application of analog Kirchoff’s and Ohm’s laws. These adjustable sources represent generalized trial quantities. In order to illustrate this proposed approach, Equivalent Network representation of lossy planar transmission lines with arbitrary metallization thickness is presented. Des sources virtuelles et ajustables sont introduites dans une représentation des conditions aux limites par un schéma équivalent. Les équations intégrales à résoudre sont alors déduites d’une simple application des lois de Kirchhoff et de la loi d’Ohm. Ces sources ajustables représentent des grandeurs d’essai généralisées. Afin d’illustrer la formulation, ces grandeurs sont introduites pour résoudre des problèmes aux limites classiques; puis le schéma équivalent des lignes de transmission planaires avec une épaisseur quelconque de metallisation à pertes est présenté.

M Guglielmi - One of the best experts on this subject based on the ideXlab platform.

  • multimode Equivalent Network for boxed multilayer arbitrary planar circuits
    IEEE Transactions on Microwave Theory and Techniques, 2020
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Vicente E Boria, Stephan Marini, Miguel A Sanchezsoriano, M Guglielmi
    Abstract:

    The multimode Equivalent Network (MEN) formulation has been originally developed for the efficient and accurate analysis of waveguide devices. In this article, we extend the use of the MEN to the analysis of zero-thickness, planar printed circuits in a metallic enclosure. The formulation is developed for metallic areas of arbitrary shape and includes both internal and external ports in the transverse plane to model connections to external components, and coaxial input/output ports. The boundary integral resonant mode expansion (BI-RME) method is used for the analysis of the arbitrary shape metallizations. On this basis, shielded multilayered microstrip circuits of complex geometry are analyzed in the common frame of the MEN technique. To validate the theoretical formulation, several boxed microstrip structures are analyzed, including multilayered configurations with several metallization interfaces, showing good agreement with respect to both other commercial tools, and measurements.

  • electric multimode Equivalent Network technique for multilayer shielded circuits based on arbitrary rectangular elements
    International Conference on Electromagnetics in Advanced Applications, 2019
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Vicente E Boria, M Guglielmi
    Abstract:

    The Multimode Equivalent Network (MEN) formulation has proved to be a very efficient and accurate numerical technique for the analysis of waveguide and single-layer boxed coupled lines microstrip filters. The aim of this contribution is to extend the electric zero-thickness MEN formulation to the analysis of multilayer boxed microstrip circuits that are based on arbitrary rectangular elements and include ports in the transverse plane. For this purpose, the MEN approach is used to model each metal interface in the multilayer stack with the appropriate Equivalent Network. The Equivalent Networks are then conveniently cascaded to obtain the final Equivalent Network that characterizes the complete circuit. The theory developed is then used to analyze a trisection filter composed of two metallization levels. The simulation results are shown to be in good agreement with measurements thereby fully validating the multilayer electric MEN formulation.

  • rigorous multimode Equivalent Network representation of multilayer planar circuits
    IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization, 2018
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Stephan Marini, Miguel A Sanchezsoriano, Vicente Enrique Boria Esbert, M Guglielmi
    Abstract:

    The objective of this paper is to extend the use of the Multimode Equivalent Network formulation, originally developed to analyze waveguide junctions, to the analysis of planar circuits that include arbitrary rectangular printed, zero thickness metallizations together with internal and external ports in the transverse plane. The theoretical derivations lead to an accurate and computationally efficient tool for the analysis of boxed, multilayer microwave printed circuits. In addition to theory, the tool developed is used here to analyze two practical examples: a dual-bandpass and a 4-pole bandpass boxed microstrip filters. Good agreement with respect to commercial software tools and measurements is shown, thereby fully validating the theoretical formulation.

  • new simple procedure for the computation of the multimode admittance matrix of arbitrary waveguide junctions
    International Microwave Symposium, 1995
    Co-Authors: A Alvarez, M Guglielmi
    Abstract:

    The description of the microwave properties of waveguide junctions is a subject that has been studied considerably in the past. Of particular interest, from the engineering point of view, have been Equivalent Network representations (single mode) because of their very good computational efficiency. However, their efficiency was obtained taking into account only dominant mode interactions and such descriptions are no longer suitable for the design of modern microwave components. Higher order mode interactions have been subsequently accounted for using mode-matching procedures, however, the resulting codes, although accurate, can be computationally very heavy. It would therefore be desirable to develop Equivalent Network representations that could at the same time include higher-order interactions and lead to computationally efficient codes. In this paper a simple method is described for the evaluation of the multimode Network representation in terms of admittance parameters. The key feature of the method is that it starts from the wanted final results, the Equivalent Network representation, in order to obtain an analytic expression for the evaluation of the admittance matrix elements. The procedure is based on general Network theory and is Equivalent to ideally measuring directly the value of the admittance elements. In this paper the evaluation procedure is fully described. Measurement results of actual hardware are then compared with simulations indicating that the codes developed are indeed very accurate as well as computationally very efficient. >

Celia Gomez Molina - One of the best experts on this subject based on the ideXlab platform.

  • multimode Equivalent Network for boxed multilayer arbitrary planar circuits
    IEEE Transactions on Microwave Theory and Techniques, 2020
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Vicente E Boria, Stephan Marini, Miguel A Sanchezsoriano, M Guglielmi
    Abstract:

    The multimode Equivalent Network (MEN) formulation has been originally developed for the efficient and accurate analysis of waveguide devices. In this article, we extend the use of the MEN to the analysis of zero-thickness, planar printed circuits in a metallic enclosure. The formulation is developed for metallic areas of arbitrary shape and includes both internal and external ports in the transverse plane to model connections to external components, and coaxial input/output ports. The boundary integral resonant mode expansion (BI-RME) method is used for the analysis of the arbitrary shape metallizations. On this basis, shielded multilayered microstrip circuits of complex geometry are analyzed in the common frame of the MEN technique. To validate the theoretical formulation, several boxed microstrip structures are analyzed, including multilayered configurations with several metallization interfaces, showing good agreement with respect to both other commercial tools, and measurements.

  • Multimode Equivalent Networks for Shielded Microwave Circuits With Thick Metallizations
    IEEE Transactions on Microwave Theory and Techniques, 2020
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Vicente E Boria, Stephan Marini, Marco Guglielmi
    Abstract:

    In this article, we show how the multimode Equivalent Network (MEN) technique can be extended to the analysis of multilayer boxed planar microwave circuits that are built using a thick metallization. This analysis is carried out considering the thick metallic circuit as a length of the uniform waveguide. The problem is then divided into two waveguide steps (or junctions). We first obtain the Equivalent Network of the two junctions. Then, we cascade them to obtain the MEN of the complete circuit, thereby including the effect of finite thickness rigorously. A key aspect of the formulation that we propose is that it includes ports in the transverse plane of the circuit. In addition to theory, several shielded microwave filters using a thick metallization are also analyzed. An in-depth study of the numerical convergence is also performed for two practical examples. Simulation results are shown to be in good agreement with both commercial simulation tools and measurements, thereby fully validating our theoretical formulation.

  • electric multimode Equivalent Network technique for multilayer shielded circuits based on arbitrary rectangular elements
    International Conference on Electromagnetics in Advanced Applications, 2019
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Vicente E Boria, M Guglielmi
    Abstract:

    The Multimode Equivalent Network (MEN) formulation has proved to be a very efficient and accurate numerical technique for the analysis of waveguide and single-layer boxed coupled lines microstrip filters. The aim of this contribution is to extend the electric zero-thickness MEN formulation to the analysis of multilayer boxed microstrip circuits that are based on arbitrary rectangular elements and include ports in the transverse plane. For this purpose, the MEN approach is used to model each metal interface in the multilayer stack with the appropriate Equivalent Network. The Equivalent Networks are then conveniently cascaded to obtain the final Equivalent Network that characterizes the complete circuit. The theory developed is then used to analyze a trisection filter composed of two metallization levels. The simulation results are shown to be in good agreement with measurements thereby fully validating the multilayer electric MEN formulation.

  • rigorous multimode Equivalent Network representation of multilayer planar circuits
    IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization, 2018
    Co-Authors: Celia Gomez Molina, Fernando Daniel Quesada Pereira, Alejandro Alvarez Melcon, Stephan Marini, Miguel A Sanchezsoriano, Vicente Enrique Boria Esbert, M Guglielmi
    Abstract:

    The objective of this paper is to extend the use of the Multimode Equivalent Network formulation, originally developed to analyze waveguide junctions, to the analysis of planar circuits that include arbitrary rectangular printed, zero thickness metallizations together with internal and external ports in the transverse plane. The theoretical derivations lead to an accurate and computationally efficient tool for the analysis of boxed, multilayer microwave printed circuits. In addition to theory, the tool developed is used here to analyze two practical examples: a dual-bandpass and a 4-pole bandpass boxed microstrip filters. Good agreement with respect to commercial software tools and measurements is shown, thereby fully validating the theoretical formulation.

Farid Bouzidi - One of the best experts on this subject based on the ideXlab platform.

  • Equivalent Network representation of boundary conditions involving generalized trial quantities application to lossy transmission lines with finite metallization thickness
    IEEE Transactions on Microwave Theory and Techniques, 1997
    Co-Authors: Farid Bouzidi, Damienne Bajon, Hervé Aubert, Henri Baudrand
    Abstract:

    The derivation of integral equations for solving boundary conditions by mere application of analog Kirchhoff's and Ohm's laws is used. Generalized trial quantities are introduced as virtual adjustable sources in the Equivalent Network representation of boundary conditions. The lossy conductor domain of a planar transmission line is represented by a particular two-port. Thus, metallic losses can be evaluated for any metallization thickness without restricting the conductor modeling to a simple surface impedance approximation. In this paper, this two-port model is discussed and numerical results relative to a lossy coplanar waveguide (CPW) are presented. These results are in very good agreement with those obtained from the mode-matching technique and with other experimental data available in the literature. The size of matrices involved in the calculation of losses is twice as large as that in the lossless case. Moreover, the authors' formulation can be easily applied to superconducting planar transmission lines.

  • Equivalent Network representation of boundary conditions involving generalized trial quantities
    Annales Des Télécommunications, 1997
    Co-Authors: Henri Baudrand, Hervé Aubert, Damienne Bajon, Farid Bouzidi
    Abstract:

    Virtual adjustable sources are introduced in Equivalent Network representation of boundary conditions. For this purpose, integral equations are to be solved simple application of analog Kirchoff’s and Ohm’s laws. These adjustable sources represent generalized trial quantities. In order to illustrate this proposed approach, Equivalent Network representation of lossy planar transmission lines with arbitrary metallization thickness is presented. Des sources virtuelles et ajustables sont introduites dans une représentation des conditions aux limites par un schéma équivalent. Les équations intégrales à résoudre sont alors déduites d’une simple application des lois de Kirchhoff et de la loi d’Ohm. Ces sources ajustables représentent des grandeurs d’essai généralisées. Afin d’illustrer la formulation, ces grandeurs sont introduites pour résoudre des problèmes aux limites classiques; puis le schéma équivalent des lignes de transmission planaires avec une épaisseur quelconque de metallisation à pertes est présenté.