4 edition of **Analysis of waveguide junction discontinuities using finite element method** found in the catalog.

Analysis of waveguide junction discontinuities using finite element method

- 350 Want to read
- 28 Currently reading

Published
**1997**
by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va
.

Written in English

- Rectangular waveguides,
- Finite element method,
- Discontinuity,
- Numerical analysis

**Edition Notes**

Statement | Manohar D. Deshpande. |

Series | NASA contractor report -- 201710., NASA contractor report -- NASA CR-201710. |

Contributions | Langley Research Center. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL17564665M |

OCLC/WorldCa | 39097191 |

between two methods, the proposed process is more efficient than classic method. 2. Complex discontinuities filters study case By using a typical methods, the size of the dispersion matrix depends on the total number of modes at the entrance and the exit of the circuit. In our variable formulation (Zhang & Liu, ) multi modal. The analysis of the field distribution and power voltage definition of impedance in various nonsymmetrical ridge structures has included mode matching techniques, a variational method and a surface integral approach. The work outlined here is based on the nodal FEM. Inspec keywords: ridge waveguides; variational techniques; finite element analysis.

APPLICATION OF MODE MATCHING METHOD TO ANALYSIS OF AXISYMMETRIC COAXIAL DISCONTINUITY STRUCTURES USED IN PERMEABILITY AND/OR PERMITTIVITY MEASUREMENT "Solution of waveguide discontinuities by modal analysis," IEEE Trans. Microwave Theory Tech T., ara, and i, "Finite-element analysis of waveguide . A highly efficient and accurate higher order large-domain finite-element technique is presented for three-dimensional (3-D) analysis of N-port waveguide structures with arbitrary metallic and dielectric discontinuities on standard PCs. The technique implements hierarchical polynomial vector basis functions of arbitrarily high field-approximation orders on Lagrange-type curved hexahedral finite.

Get this from a library! Analysis of waveguide junction discontinuities using finite element method: contract NAS [Manohar D Deshpande; Langley Research Center.]. A finite-difference time domain scheme for the analysis of H-plane waveguide discontinuities is described. The two-dimensional treatment of this kind of discontinuities and the use of a non-monochromatic excitation allow us to develop an efficient algorithm with a low demand of computer resources. The method is tested by comparing the numerical results for a right corner bend and a T-junction.

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ﬁnite element method. In the ﬁrst part, the general theory of rectangular waveguides is derived and described as well as a very detailed mathematical analysis of rectangular waveguide discontinuities for both, the E-plane and H-plane formulations.

We also present a practical approach for computing scattering parameters using Finite Elements. A Finite Element Method (FEM) is presented to determine reflection and transmission coefficients of rectangular waveguide junction discontinuities. A Finite Element Method (FEM) is presented to determine reﬂection and transmission coefﬁcients of rectangular waveguide junction discontinuities.

An H-plane discontinuity, an E-plane ridge discontinuity and a step discontinuity in a concentric rectangular waveguide junction are analyzed using the FEM procedure. Also, reﬂection and. A Finite Element Method (FEM) is presented to determine reflection and transmission coefficients of rectangular waveguide junction discontinuities.

H- E- plane discontinuities in a concentric/non concentric rectangular waveguide junction are analyzed using Cited by: 1. Analysis of complex rectangular waveguide discontinuities using hybrid MVM-FEM book about eight years ago, much progress has been made in the development of the finite element method for the.

Abstract: A novel approach for analyzing discontinuity problems in optical waveguides is presented. The method is a combination of the vector-finite-element method and the least-squares boundary residual method.

The vector-H-field-finite-element method is capable of providing accurate eigenvalues and eigenvectors for a wide range of optical waveguide. A novel computer-aided design (CAD) tool of complex passive microwave devices in rectangular waveguide technology is suggested.

The multimodal variational method is applied to the full-wave description in the rectangular waveguides while the finite element analysis characterizes waves in the arbitrarily shaped discontinuities.

The put forward hybrid approach is. As a consequence, many contributions can indeed be found in the technical literature describing analysis methods for waveguide discontinuity problems.

Some of the contributions describe general purpose computational electromagnetic methodologies based on techniques such as Finite-Difference Time-Domain (FDTD) Peterson et al. [3] or Finite.

HFSS and MWS CST Many efficient numerical methods like Finite integration technique and Finite element method are used for solving the electromagnetic problems. The H- plane discontinuities are modelled using CST MWS, which is very user friendly 3-D software for designing and simulation of variety of EM structures.

In this paper, we present a generalized multimodal absorbing boundary condition formulated for three-dimensional vector TDFEM analysis for waveguide structures. The proposed boundary condition, which we refer to as waveguide port boundary condition (WPBC), is capable of perfectly absorbing both propagating and evanescent modes incident on a waveguide port.

Abstract. 5 1. Introduction 5 2. Theory 9 3. Numerical Results 13 4. Conclusion 20 References 2 List of Figures Figure 1(a) Rectangular waveguide junction with misalignment in the x-direction (waveguide flanges at the junction are not shown) Figure 1(b) Rectangular waveguide junction with misalignment in the y-direction Figure1(c) Rectangular waveguide junction with an air.

This idea, related to the founders of the waveguide theory, is additionally required for interpretations of the results obtained by those numerical methods which calculate the field in the whole discontinuity domain without using the modal expansion method.

References Figures Pages Abstract: A combination of the body-of-revolution and finite element methods is adopted for full-wave analysis of waveguides and waveguide discontinuities involving angular field variation.

Such an approach is highly efficient and much more flexible than analytical techniques. The method is performed in two different cases: utilizing a generalized impedance matrix to. Optical Waveguide Discontinuity Problem.

Finite‐Element Analysis of Discontinuity Problems. Derivation of Finite‐Element Matrices. Application of Taylor's Series Expansion. Computation of Reflected, Transmitted and Radiation Waves. Optical Fibre Facet Problem.

Finite‐Element Analysis of Optical Fibre Facets. Iterative Analysis of Multiple. By using the Finite-Difference Time-Domain method (FDTD), several E-plane Forked T-junctions are analyzed. Good agreement between the calculation and the experimental results given by [5][11] is found.

The scattering parameters of these T-junctions are obtained by applying the Fast-Fourier Transform method (FFT). Its use in industry and research is extensive, and indeed it could be said that with out it many optical waveguide problems would be incapable of solution. This book is intended for students, engineers, designers, and techni cal managers interested in a detailed description of the FEM for optical waveguide analysis.

Calculate the electromagnetic eigenmodes and propagation constants of optical waveguides using the finite difference method. Features: 1. Includes vector, semivector, and scalar versions. Can solve for all components of E and H.

Allows for perfectly-matched boundary layers. Can model transverse anisotropic materials. Several. Analysis of Discontinuities in a Rectangular Waveguide Using Dyadic Green's Function Approach in Conjunction With Method of Moments M.

Deshpande ViGYAN, Inc., Hampton, Virginia Contract NAS April National Aeronautics and Space Administration Langley Research Center Hampton, Virginia The paper applies the re-expansion method for analyzing planar discontinuities at the junction of two axi-symmetrical circular waveguides.

The normal modes in the two waveguides are expanded at the junction plane into a system of functions accounting for velocity singularities at the corner points. 2 The Finite Element Formulation.

A waveguide discontinuity power divider is a particular case in which the ports are waveguides. Let us consider a structure that is excited through the fundamental mode at a given port. However, at the discontinuity the complex formulas have been determined by the finite element method procedure.

The use of edge‐elements eliminates nonphysical solutions. The reliability of the method is assured compared to a penalty method. Accuracy of the method is demonstrated through the presentation of results for a waveguide T‐junction, while its efficiency is proven through the presentation of results for two case studies of a finite step.Technique (FIT) and Finite Element Method (FEM) respectively, based on accuracy and simulation time.

Analysis of the waveguide discontinuities is of great importance. A powerful approach is the mode matching technique (MMT) with scattering matrix for the junction 1 in cascaded H-plane discontinuity of Fig. 1 can be characterized by.Analysis of Waveguide Junction Discontinuities Using Finite Element Method Rectangular waveguide junction with an air gap Figure 2 Geometry of rectangular waveguide junction discontinuity and an air gap Figure 3 Top view of H-plane discontinuity in rectangular waveguide (Waveguide I, Wx1 = cm, Wy =cm, Waveguide II Wx2 = cm, Wy.