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©2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works., The discretization by the Method of Moments (MoM) of electromagnetic integral equations, namely, the Electric Field Integral Equation (EFIE) for perfect electric conductors (PECs) and the Poggio-Miller-Chan-Harrington-Wu-Tsai (PMCHWT) integral formulation for penetrable objects, is usually carried out with divergence-conforming sets of basis functions. However, in the single-surface analysis of piecewise homogeneous composite objects the implementation of divergence-conforming sets around junction-edges, where several regions intersect, becomes convoluted. Recently, the monopolar-RWG discretization, discontinuous at edges, of the EFIE and the PMCHWT formulation has been proposed. In this paper we show how this facet-based scheme becomes well suited for the single-surface analysis of piecewise homogeneous composite objects without giving special attention to junction-edges., Peer Reviewed, Postprint (published version)

The main objective of our effort is the development of stable, accurate and efficient Maxwell solvers. We focus on mathematical studies of the key unresolved issues in the Finite-Difference Time-Domain (FDTD) electromagnetic simulations. We have extended the subpixel smoothing FDTD method to material interface between dielectric and dispersive media by local coordinate rotation. A novel stable anisotropic FDTD algorithm based on the overlapping cells has been developed for solving Maxwell's equations of electrodynamics in anisotropic media with material interface between anisotropic dielectrics and dispersive medium or Perfect Electric Conductor (PEC). We have extended the overlapping Yee FDTD method to locally non-orthogonal grids, with application to the optical force computation on nanoparticles. We have developed a moving window full Maxwell solver algorithm with perfectly matched absorbing layer (PML) boundary conditions in order to accurately simulate the propagation of localized waves over a very long distance (millions of wavelength) in complex media. Furthermore, we have implemented the Adaptive Mesh Refine., The original document contains color images.

The performances of a parallel plate waveguide (PPWG) supported by perfect electric conductor (PEC)-graphene and graphene-graphene plates are evaluated. The graphene plate behavior is modeled as an anisotropic medium with both diagonal and Hall conductivities derived from Kubo formula. The PPWG modes supported by PEC-graphene and graphene-graphene plates are studied. Maxwell’s equations are solved for these two waveguides, while the graphene layers are biased with an electric field only and with both electric and magnetic fields. It is shown that when both electric and magnetic biases are applied to the graphene, a hybrid mode (simultaneous transverse electric (TE) and transverse magnetic (TM) modes) will propagate inside the waveguide. The intensity of each TE and TM modes can be adjusted with the applied external bias fields. Study of different waveguides demonstrates that by decreasing the plate separation (d), the wave confinement improves. However, it increases the waveguide attenuation. A dielectric layer inserted between the plates can also be used to improve the wave confinement. The presented analytical procedure is applicable to other guiding structures having walls with isotropic or anisotropic conductivities.

Exact analytical solutions for the quasistationary electromagnetic fields in the presence of conducting objects require the field solutions both internal and external to the conductors. Such solutions are limited for certain canonically shaped objects but are useful in testing the accuracy of various approximate models and numerical methods developed to solve complex problems related to real world conducting objects and in calibrating instruments designed to measure various field quantities. Theoretical investigations of quasistationary electromagnetic fields also aid in improving the understanding of the physical phenomena of electromagnetic induction. This thesis presents rigorous analytical expressions derived as benchmark solutions for the quasistationary field quantities both inside and outside, Joule losses and the electromagnetic forces acting upon a conducting spheroid placed in the proximity of a non-uniform field produced by current-carrying turns. These expressions are used to generate numerous numerical results of specified accuracy and selected results are presented in a normalized form for extended ranges of the spheroid axial ratio, the ratio of the depth of penetration to the semi-minor axis and the position of the inducing turns relative to the spheroids. They are intended to constitute reference data to be employed for comprehensive comparisons of results from approximate numerical methods or from boundary impedance models used for real world conductors. Approximate boundary conditions such as the simpler perfect electric conductor model or the Leontovich surface impedance boundary condition model can be used to obtain approximate solutions by only analyzing the field external to the conducting object. The range of validity of these impedance boundary condition models for the analysis of axisymmetric eddy-current problems is thoroughly investigated. While the simpler PEC model can be employed only when the electromagnetic depth of penetration is mu

Exact analytical solutions for the quasistationary electromagnetic fields in the presence of conducting objects require the field solutions both internal and external to the conductors. Such solutions are limited for certain canonically shaped objects but are useful in testing the accuracy of various approximate models and numerical methods developed to solve complex problems related to real world conducting objects and in calibrating instruments designed to measure various field quantities. Theoretical investigations of quasistationary electromagnetic fields also aid in improving the understanding of the physical phenomena of electromagnetic induction. This thesis presents rigorous analytical expressions derived as benchmark solutions for the quasistationary field quantities both inside and outside, Joule losses and the electromagnetic forces acting upon a conducting spheroid placed in the proximity of a non-uniform field produced by current-carrying turns. These expressions are used to generate numerous numerical results of specified accuracy and selected results are presented in a normalized form for extended ranges of the spheroid axial ratio, the ratio of the depth of penetration to the semi-minor axis and the position of the inducing turns relative to the spheroids. They are intended to constitute reference data to be employed for comprehensive comparisons of results from approximate numerical methods or from boundary impedance models used for real world conductors. Approximate boundary conditions such as the simpler perfect electric conductor model or the Leontovich surface impedance boundary condition model can be used to obtain approximate solutions by only analyzing the field external to the conducting object. The range of validity of these impedance boundary condition models for the analysis of axisymmetric eddy-current problems is thoroughly investigated. While the simpler PEC model can be employed only when the electromagnetic depth of penetration is mu

Planární nositelná anténa sestává z širokopásmového planárního monopólu, koplanárního vlnovodu a umělého magnetického vodiče. Cílem této práce bylo, pomocí simulací a porovnání se vzorovou publikací, ověření správnosti jejich dílčích komponentů. V práci jsou uvedeny rozbory jednotlivých komponentů, jejich dílčí simulace a následné porovnání se vzorovou publikací. Uplatnění planární nositelné antény se nalézá ve zdravotnictví, sportu, u bezpečnostních a záchranářských složek, ve vojenské sféře a všude, kde je zapotřebí monitorování polohy a zdravotního stavu osob., Planar wereable antenna consists of planar wide-band monopole, coplanar waveguide, and artificial magnetic conductor. The goal of this thesis is to verify the legitimacy of their subcomponents by using simulations and comparsions with a paragidmatic publication. The proposed thesis presents analysis of particular components, their partial simulations and comparison with paradigmatic publication. The planar wearable antenna can be used in disciplines such as healtcare, sports, security and rescue services, the military and wherever the position and health of subjects is required to track / monitor.

Planární nositelná anténa sestává z širokopásmového planárního monopólu, koplanárního vlnovodu a umělého magnetického vodiče. Cílem této práce bylo, pomocí simulací a porovnání se vzorovou publikací, ověření správnosti jejich dílčích komponentů. V práci jsou uvedeny rozbory jednotlivých komponentů, jejich dílčí simulace a následné porovnání se vzorovou publikací. Uplatnění planární nositelné antény se nalézá ve zdravotnictví, sportu, u bezpečnostních a záchranářských složek, ve vojenské sféře a všude, kde je zapotřebí monitorování polohy a zdravotního stavu osob., Planar wereable antenna consists of planar wide-band monopole, coplanar waveguide, and artificial magnetic conductor. The goal of this thesis is to verify the legitimacy of their subcomponents by using simulations and comparsions with a paragidmatic publication. The proposed thesis presents analysis of particular components, their partial simulations and comparison with paradigmatic publication. The planar wearable antenna can be used in disciplines such as healtcare, sports, security and rescue services, the military and wherever the position and health of subjects is required to track / monitor.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén v kmitočtovém pásmu 1 GHz až 10 GHz., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas in the frequency range of 1 GHz to 10 GHz.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén v kmitočtovém pásmu 1 GHz až 10 GHz., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas in the frequency range of 1 GHz to 10 GHz.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén v kmitočtovém pásmu 1 GHz až 10 GHz., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas in the frequency range of 1 GHz to 10 GHz.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas.

Planární nositelná anténa sestává z širokopásmového planárního monopólu, koplanárního vlnovodu a umělého magnetického vodiče. Cílem této práce bylo, pomocí simulací a porovnání se vzorovou publikací, ověření správnosti jejich dílčích komponentů. V práci jsou uvedeny rozbory jednotlivých komponentů, jejich dílčí simulace a následné porovnání se vzorovou publikací. Uplatnění planární nositelné antény se nalézá ve zdravotnictví, sportu, u bezpečnostních a záchranářských složek, ve vojenské sféře a všude, kde je zapotřebí monitorování polohy a zdravotního stavu osob., Planar wereable antenna consists of planar wide-band monopole, coplanar waveguide, and artificial magnetic conductor. The goal of this thesis is to verify the legitimacy of their subcomponents by using simulations and comparsions with a paragidmatic publication. The proposed thesis presents analysis of particular components, their partial simulations and comparison with paradigmatic publication. The planar wearable antenna can be used in disciplines such as healtcare, sports, security and rescue services, the military and wherever the position and health of subjects is required to track / monitor.

Planární nositelná anténa sestává z širokopásmového planárního monopólu, koplanárního vlnovodu a umělého magnetického vodiče. Cílem této práce bylo, pomocí simulací a porovnání se vzorovou publikací, ověření správnosti jejich dílčích komponentů. V práci jsou uvedeny rozbory jednotlivých komponentů, jejich dílčí simulace a následné porovnání se vzorovou publikací. Uplatnění planární nositelné antény se nalézá ve zdravotnictví, sportu, u bezpečnostních a záchranářských složek, ve vojenské sféře a všude, kde je zapotřebí monitorování polohy a zdravotního stavu osob., Planar wereable antenna consists of planar wide-band monopole, coplanar waveguide, and artificial magnetic conductor. The goal of this thesis is to verify the legitimacy of their subcomponents by using simulations and comparsions with a paragidmatic publication. The proposed thesis presents analysis of particular components, their partial simulations and comparison with paradigmatic publication. The planar wearable antenna can be used in disciplines such as healtcare, sports, security and rescue services, the military and wherever the position and health of subjects is required to track / monitor.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén v kmitočtovém pásmu 1 GHz až 10 GHz., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas in the frequency range of 1 GHz to 10 GHz.

Tato diplomová práce se zabývá návrhem planární spirálové antény. Cílem práce bylo navrhnout vhodnou planární spirálovou anténu, která bude splňovat požadavky zadaní. V práci jsou představeny dva typy těchto antén a následně je pro jeden konkrétní vytvořen návrh a model. Jsou zde diskutovány výsledky simulací modelu a následná optimalizace. V práci jsou zkoumány charakteristické parametry antény a jejich rozbor. Model je následně optimalizován a probíhá diskuse nad výsledky. Výstupem této práce by měla být navrhnutá anténa, která bude sloužit jako komponenta pro měření charakteristických parametrů reálných antén., This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas.

The performances of a parallel plate waveguide (PPWG) supported by perfect electric conductor (PEC)-graphene and graphene-graphene plates are evaluated. The graphene plate behavior is modeled as an anisotropic medium with both diagonal and Hall conductivities derived from Kubo formula. The PPWG modes supported by PEC-graphene and graphene-graphene plates are studied. Maxwell’s equations are solved for these two waveguides, while the graphene layers are biased with an electric field only and with both electric and magnetic fields. It is shown that when both electric and magnetic biases are applied to the graphene, a hybrid mode (simultaneous transverse electric (TE) and transverse magnetic (TM) modes) will propagate inside the waveguide. The intensity of each TE and TM modes can be adjusted with the applied external bias fields. Study of different waveguides demonstrates that by decreasing the plate separation (d), the wave confinement improves. However, it increases the waveguide attenuation. A dielectric layer inserted between the plates can also be used to improve the wave confinement. The presented analytical procedure is applicable to other guiding structures having walls with isotropic or anisotropic conductivities.