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FINITE-ELEMENT ANALYSIS OF chirowaveguides

ELECTRONICS LETTERS 1990年第13期26卷 928-929页

作者： SVEDIN, JAM Dept. of Inf. Technol. Swedish Defence Res. Establ. Linkoping Sweden

A finite-element formulation for the modal analysis of chirowaveguides is described. It constitutes a generalisation of the vector EH formulation, which has earlier been found to be without spurious nonphysical solutions. The validity of the suggested formulation is confirmed by comparing obtained dispersion relations for a circular chirowaveguide with corresponding exact solutions, the correspondence was found to be excellent.

关键词： chirowaveguides circular chirowaveguide dispersion relations exact solutions finite element analysis finite element analysis modal analysis optical properties of substances optical waveguide theory vector EH formulation waveguide theory

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PROPAGATION ANALYSIS OF chirowaveguides USING THE FINITE-ELEMENT METHOD

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1990年第10期38卷 1488-1496页

作者： SVEDIN, JAM Department of Information Technology (FOA3) Swedish Defence Research Establishment Linkoping Sweden

Propagation analysis of chirowaveguides, i.e. waveguides including chiral media, are calculated using a generalization of the full vector finite-element formulation in terms of the electric and magnetic fields. The formulation permits numerous inhomogeneous waveguide structures of arbitrary linear composition, including chiral media, to be analyzed without any nonphysical, spurious modes. In the proposed formulation both the necessary conditions on the tangential field components and the additional conditions on the normal field components are automatically satisfied by the trial functions. In this way the dimension of the resulting sparse generalized eigenvalue problem is significantly reduced. The straightforward extension to the novel class of chirowaveguides, which exhibit a number of interesting new features, demonstrates the versatility of the formulation. The advantageous numerical properties are thus preserved. Numerical examples on both metal and dielectric chirowaveguides are given. The finite-element results are compared with exact solutions, and the correspondence is found to be excellent.

关键词： chirality FINITE ELEMENT Finite element method Waveguide Device Component field component chirowaveguides

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GUIDED ELECTROMAGNETIC-WAVES IN GYROTROPIC chirowaveguides

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1994年第11期42卷 2156-2163页

作者： YIN, WY WANG, WB LI, P XIAN JIAOTONG UNIV DEPT INFORMAT & CONTROL ENGNXIANPEOPLES R CHINA

The propagation characteristics of hybrid modes in the circular cylindrical and coaxial line gyrotropic chirowaveguides are studied using the technique of separation variables. First, the transverse components of electric and magnetic fields are expressed in terms of the longitudinal components of (E) over bar and (H) over bar. Then, numerical results are presented for the dispersion behavior and cut-off frequencies as well as the field distributions of hybrid E H-0,H-1 and H E(n,1), with the effects of different electromagnetic parameters of gyrotropic chiral material taken into consideration. It is shown that the process of mode bifurcation also takes place in the gyrotropic chirowaveguides;this is similar to the cases of reciprocal chirowaveguides. But, gyrotropic chirowaveguides are nonreciprocal bianisotropic devices.

关键词： separation of variables Hybrid modes longitudinal component propagation characteristics Electricity magnetic field electromagnetic waves chirowaveguides field distribution

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COUPLING PROCESSES IN CIRCULAR OPEN chirowaveguides

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IEE PROCEEDINGS-H MICROWAVES ANTENNAS AND PROPAGATION 1992年第2期139卷 165-170页

作者： CORY, H TAMIR, T Electrical Engineering Department Technion-Israel Institute of Technology Haifa Israel

The dispersion curves of circular open chirowaveguides have been obtained by two different methods. The first is based on the fulfillment of the boundary conditions at the surface of the guide. The second is based on the expansion of the electromagnetic fields in the chiral guide in terms of the modes propagating in the dielectric guide having the same geometry, permittivity-episilon and permeability-mu. It is assumed that the chirality admittance is much smaller square-root(epsilon/mu). The frequency behaviour of the dispersion curves and the coupling processes occurring between the modes along the guide are analysed.

关键词： chirowaveguides DISPERSION CURVES

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MODE ORTHOGONALITY IN chirowaveguides

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1990年第11期38卷 1631-1634页

作者： ENGHETA, N PELET, P Moore School of Electrical Engineering University of Pennsylvania Philadelphia PA USA

The orthogonality relations for modes supported by a general cylindrical chirowaveguide are derived. These waveguiding structures are cylindrical waveguides containing chiral materials. It is pointed out that one of these relations is valid for lossless waveguides, whereas the other holds for the lossy as well as the lossless case. It is demonstrated that the orthogonality relations can be used to express an arbitrary electric or magnetic field within a chirowaveguide in terms of the mode functions. As in conventional waveguides, the orthogonality relations reported can be used to expand an arbitrary E or H field within a chirowaveguide in terms of a complete set of mutually orthogonal modes in the waveguide.

关键词： Lossless circular waveguides orthogonality Waveguide Device Component chirowaveguides

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GUIDED MODES ON OPEN chirowaveguides

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1995年第1期43卷 205-209页

作者： MAHMOUD, SF ECE Department Kuwait University Safat Kuwait

Surface wave modes on an open chiral rod and a planar chiral slab are studied, It is shown that the effect of chirality is to split each mode in the nonchiral case to a pair of modes, the cutoff frequencies of which are above and below that of the nonchiral case, The mode with the lower cutoff frequency is dominantly right circularly polarized (RCP) mode while the made with the higher cutoff frequency is dominantly left circularly polarized (LCP) mode near their respective cutoff frequencies. At sufficiently higher frequencies, all modes tend to become RCP (assuming a right handed chiral medium), Closed form expressions for modal cutoff frequencies on the planar chiral slab and chiral circular rod are derived, The surface wave modes are classified as HE and EH modes and a suitable definition for these mode types, that reduces to well known definitions in the nonchiral case, is proposed.

关键词： surface waves chirality Cutoff frequency REACTOR COOLANT PUMP Guided Mode chirowaveguides

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Network representation and transverse resonance for layered chirowaveguides

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1996年第8期44卷 1496-1499页

作者： Xu, SJ Kai, D Department of Electronic Engineering and Information Science University of Science and Technology Hefei Anhui China

This paper presents an equivalent network method for dispersion analysis of general chirowaveguides. First, wave propagation in each homogeneous layer is represented by two pairs of transmission lines, the matrix wave impedance is defined. Next, the transformation properties of the input impedance are established. It is then demonstrated that the transverse resonance condition involving the previously obtained matrix impedance leads to the dispersion equation for the waveguides. The numerical results show that this network approach is feasible and practicable.

关键词： impedance Transmission Lines transverse resonance chirowaveguides

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Mode orthogonality relations and field structure in chirowaveguides

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1996年第3期44卷 465-469页

作者： Kamenetskii, EO Faculty of Engineering Tel-Aviv University Israel

By analyzing the vector and scalar equations for chirowaveguides, two forms of mode orthogonality relations are obtained: the vector formulated orthogonality and the scalar formulated orthogonality. The first one is applicable to the general case of open chiroplasma or chiroferrite waveguides. It is shown that for two parallel-plate isotropic chirowaveguides, these two forms of orthogonality relations differ. Based on mode orthogonality relations, it is shown that in chirowaveguides the polarization of so-called complex modes differs from that of propagating or evanescent modes. The correlation between field components of two complex modes that transfer active power flow in chirowaveguides is obtained.

关键词： Power flow orthogonality field structure Propagating chirowaveguides

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Admittance determination for cylindrical soft and hard surface chirowaveguides for mode transformation

Admittance determination for cylindrical soft and hard surfa...

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Conference on Complex Mediums III - Beyond Linear Isotropic Dielectrics

作者： Ertürk, U Uçkun, S Univ Gaziantep Dept Elect & Elect Engn TR-27310 Gaziantep Turkey

ISBN: (纸本)0819445746

The generalized dyadic admittance resulting from the transverse fields in slightly chiral soft and hard surface waveguides is presented. The derived admittance is useful in describing the mode transforming effect of the waveguide. In the analysis of the admittance equations, it is observed that the length of the waveguide is of critical importance.

关键词： chiral medium chirowaveguides mode transformation

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A study on the solutions of chirowaveguides and bianisotropic waveguides with the use of coupled-mode analysis

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1997年第5期14卷 308-311页

作者： Xu, YS Bosisio, RG Ctr. Rech. Avancees Microondes E. POLY-GRAMES Ecl. Polytech. de Montréal Montreal Que. H3C 3A7 C.P. 6079 Succursale Centre-Ville Canada

This article gives a study of coupled-mode analysis for chirowaveguides. Waveguides with chiral material in contact with the perfect electric conducting walls are analyzed with the use of the magnetic-field-expansion approach. It is shown that this approach can provide satisfactory results, including propagation constants and field component configurations. Both magnetic-field-expansion and magnetic-induction-expansion approaches are discussed and compared with each other. Methods of derivation of general expressions of coupling coefficients with the use of the magnetic-induced-expansion approach for bianisotropic waveguides are also given in detail. (C) 1997 John Wiley & Sons, Inc.

关键词： chirowaveguides bianisotropic waveguides coupled-mode theory

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