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dc.contributor.authorGómez Molina, Celia
dc.descriptionMención Europeo / Mención Internacional: Concedidoes_ES
dc.description.abstractAmong all the numerical methods described in the technical literature and implemented in the electromagnetic (EM) full-wave simulators, this Ph. D. dissertation is focused on the Multimode Equivalent Network (MEN) technique. The main objective of this doctoral thesis is to extend the state of the art in the MEN context. This technique is based on the individual characterization of the discontinuities present in the structure. For each discontinuity, it starts by imposing the boundary conditions to obtain the relevant integral equations (IEs) that model the problem. After solving the IEs, the discontinuity is then characterized through an equivalent network, where the interactions between the modes on both sides of the discontinuity are rigorously account for by an impedance or admittance coupling matrix. Finally, the individual MENs are conveniently combined to perform the analysis of the complete device. This technique was originally developed for the analysis of waveguide components, where the excitations are the guided modes on both sides of the discontinuities. This formulation is revisited in this document as starting point. Several mechanisms to increase the computational effciency of this technique for waveguide analyses are also proposed in this doctoral thesis. Then, in order to extend the functionality of this technique and adapt it to other technologies that are nowadays commonly used in certain applications (such as microstrip or stripline), we develop in this doctoral thesis the MEN formulation for single-layer and multilayer planar components. We start formulating the MEN representation for zero-thickness discontinuities composed of rectangular obstacles, containing lateral ports in the transverse plane. This development is based on an electric MEN approach. The introduced lateral excitations are employed to model the coaxial connectors that normally excite the planar shielded structures. The excitation of the components through these ports is the most important difference with respect to the MEN formulations for waveguide problems. It allows to analyze planar devices where the excitation of the structures is lateral, instead of through guided modes (as in waveguide components). Then, we extend this analysis to zero thickness discontinuities that contain lateral ports and are formed by arbitrarily shaped metallizations. This is possible thanks to the combination of the magnetic MEN technique with the Boundary Integral-Resonant Mode Expansion (BI-RME) method. This extension allows the analysis of a large variety of microwave planar components using the MEN approach. In this development, internal ports are also considered for inter-connection purposes. Based on this MEN formulation, we detail how to consider ohmic losses in the discontinuity when the magnetic approach is used. Finally, we extend the MEN technique to the analysis of multilayer boxed planar microwave circuits that are built using a thick metallization. This formulation is particularly necessary when the thickness of the metallization becomes electrically large. All the proposed MEN extensions have been programmed in MATLAB. To validate the formulations, we select certain microwave components as examples and we analyze them running our MATLAB MEN codes. Then, we compare the simulations to different commercial software results, measurements from prototypes (if they are available) and results from the technical literature. In addition, several microwave fflters have been designed in this document. They are implemented in different technologies (rectangular waveguide, thick metallic bars and microstrip) for different applications. These fflters have been also simulated using the MEN formulations proposed in this doctoral thesis. All these numerical results show good agreement with respect to other full-wave EM tools and measurements, thereby fully validating the MEN extensions proposed in this thesis. Finally, an optimization module has been added to the MEN codes and allows the design of microstrip components using the MEN formulation.es_ES
dc.publisherCelia Gómez Molinaes_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.title.alternativeInvestigación en técnicas numéricas basadas en ecuación integral para el análisis y diseño de dispositivos de microondas para comunicaciones espacialeses_ES
dc.titleInvestigations on numerical techniques based on integral equation for the analysis and design of microwave devices in space applicationsen
dc.subjectBandpass filterses_ES
dc.subjectCoupled line fiterses_ES
dc.subjectDual-mode filterses_ES
dc.subjectHybrid waveguide microstrip technologyes_ES
dc.subjectIntegral equationses_ES
dc.subjectMethod of Moments (MoM)es_ES
dc.subjectMicrowave filterses_ES
dc.subjectMultilayer deviceses_ES
dc.subjectMultimode equivalent networkses_ES
dc.subjectNumerical methodses_ES
dc.subjectPlanar junctionses_ES
dc.subjectResonator filterses_ES
dc.subjectStopband filterses_ES
dc.subjectTaylor serieses_ES
dc.subjectThick junctionses_ES
dc.subjectTransmission zeroses_ES
dc.subjectTransversal filterses_ES
dc.subjectWaveguide fillterses_ES
dc.subjectWaveguide junctionses_ES
dc.subjectWideband fillterses_ES
dc.subjectWilkinson divideres_ES
dc.subject.otherTeoría de la Señal y las Comunicacioneses_ES
dc.contributor.advisorÁlvarez Melcón, Alejandro 
dc.contributor.advisorQuesada Pereira, Fernando Daniel
dc.description.centroEscuela Internacional de Doctorado de la Universidad Politécnica de Cartagenaes_ES
dc.contributor.departmentTecnologías de la Información y las Comunicacioneses_ES
dc.description.universityUniversidad Politécnica de Cartagenaes_ES
dc.subject.unesco2202.10 Radioondas y Microondases_ES
dc.description.programadoctoradoPrograma de Doctorado en Tecnologías de la Información y las Comunicaciones por la Universidad Politécnica de Cartagenaes_ES

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Atribución-NoComercial-SinDerivadas 3.0 España
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