Flanged Parallel-plate Waveguide Research Articles

Simple, efficient, and accurate analysis of the flanged parallel-plate waveguide

The flanged parallel-plate waveguide is analysed based on the method of Kobayashi potential (KP) using Fourier function space. The presentation of the method is free from intricate mathematics. Standard integral identities are used for problem formulation, without direct use of Weber-Schafheitlin (WS) integrals. The Fourier function space is exploited for the construction of the governing linear equations instead of Jacobi polynomials. A simple strategy is suggested for the evaluation of the required improper integrals. Near-field results are validated through convergence analysis. Far-field patterns are compared with predictions of the surface equivalence theorem (SET).

A Study on the Coupling of a Flanged Parallel-Plate Waveguide to a Slit In a Nearby Conducting Screen for Near-Field Scanning Microscopy

The problem of electromagnetic coupling between a slit fed by a flanged parallel-plate waveguide(PPW) and a slit in an infinite nearby conducting screen parallel to the flanged ground conductor is studied as a simplified problem for a near-field scanning microscopy(NSM). The method of moments isused to solve the coupled integral equations for the electric field distributions over the slits. The performance of the proposed apparatus as an NSM is tested by examining the effects of some geometrical parameters on the equivalent slit admittance and coupled powers through the slits.

Flanged parallel-plate waveguide coupled to a conducting cylinder through a dielectric covered aperture

A simple and efficient numerical solution method is presented for the problem of a flanged parallel-plate waveguide whose aperture is loaded from the exterior by a dielectric semicylinder of arbitrary cross-section. The exterior half-space of the waveguide also contains a nearby conducting cylinder, which is disjoint from the dielectric load. According to the equivalence principle one shorts the guide aperture and places equivalent magnetic currents on opposite sides of the slot. By using image theory and the surface equivalence principle, which employ only equivalent electric currents at the material interface, one obtains a set of coupled integral equations in terms of the aperture electric field and equivalent currents on the cylinders. Data are presented to show the effect of conductor and dielectric loading on the aperture electric field, the current on the conductor, the reflection coefficient and the radiation pattern for TEM-wave excitation from within the waveguide.

Radiation Properties of an Arbitrarily Flanged Parallel-Plate Waveguide

The radiation properties of an arbitrarily flanged parallel-plate waveguide are investigated by means of the boundary integral equations that are called guided-mode extracted integral equations. The boundary integral equations derived in this paper can be solved by the conventional boundary-element method. Numerical results are presented for a number of cases of flanged parallel-plate waveguide. Reflection coefficient, reflected and radiated powers as well as radiation patterns are numerically calculated for the incidence of transverse electric guided-mode wave.

Radiation Properties of a Dielectric-loaded Flanged Parallel-plate Waveguide with Box-type Termination

Summary The domain product technique is used to study radiation properties of a flanged parallel-plate waveguide with a shaped radiating end incorporating a dielectric. The analysis is applied to obtain the reflection coefficient, radiation pattern and the aperture magnetic field in the case of a TEM mode excitation. It is found that a suitable choice of geometrical and physical parameters of the loading can ensure an excellent match of the waveguide to the free space. The frequency band of the best match can be shifted in a desired manner along the frequency axis. The analysis also shows that the radiation pattern can be modified to a considerable extent by altering the geometry of the termination.

Accurate absorbing boundary conditions for the FDTD analysis of H-plane waveguide discontinuities

A brief discussion about absorbing boundary conditions is presented which focuses on the FDTD modelling of waveguide discontinuities. An accurate first-order ABC is developed and tested, and also second-order ABCs are designed and discussed, which are used with a nonmonochromatic excitation. Finally, these ABCs are used in the study of some common H-plane waveguide discontinuities: a waveguide-type dielectric filter and an open-ended flanged parallel plate waveguide.

A series solutions for TM-mode radiation from a flanged parallel-plate waveguide

TM-mode radiation from a flanged parallel-plate waveguide is reexamined. The Fourier transform is used to represent the radiation field and the reflection coefficient in simple series forms. Computations are performed to illustrate the behaviors of the angular radiation pattern and the reflection coefficient. The series solution is fast convergent so that it is very efficient for numerical computation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Analytic solution for TE-mode radiation from a flanged parallel-plate waveguide

The problem of TE-mode radiation from a flanged parallel-plate waveguide is reexamined. The technique of the Fourier transform is used to represent the radiation field in a simple analytic series form. The series solution is compared with other results, thus clarifying the discrepancies between different numerical approaches. The analytic series solution is exact and more efficient than other existing numerical solutions.

Scattering and reception by a flanged parallel-plate waveguide: TE-mode analysis

The TE-mode characteristics of scattering and reception by a flanged parallel-plate waveguide are examined. The Fourier transform is used to represent the scattered fields in the spectral domain. The simultaneous equations for the transmitted field coefficients are solved to obtain the solution in an asymptotic series form. Numerical computations are performed to illustrate the behaviors of the scattered held and the transmission coefficients versus the aperture size. >

Flanged parallel-plate waveguide coupled to a conducting cylinder

The characteristics of a flanged parallelplate waveguide coupled to a conducting cylinder are investigated in general. The parallel-plate guide opens, through a slot aperture in an infinite screen, into a semi-infinite half-space in which resides a perfectly conducting cylinder of arbitrary cross-section whose axis is parallel to that of the slot. The excitations considered for this structure are (a) a TEM wave in the guide and (b) a line source in the region exterior to the guide, which when sufficiently remote creates a local plane wave. Coupled integral equations for the aperture electric field (or equivalent magnetic current) and the cylinder current are derived from first principles and are solved numerically for cylinders of various cross-section, size and location relative to that of the slot aperture. From knowledge of aperture electric field and cylinder current, all other quantities of interest may be determined: voltage received in the guide, guide reflection coefficient and far-zone radiation. Data are presented that illustrate how the cylinder loads the guide, modifies its radiation pattern and serves as a shield for the aperture. From the data, one can assess the effectiveness of a conducting shield placed over, but not in contact with, the guide aperture.

Radiation properties of a flanged parallel-plate waveguide loaded with an epsilon - mu general anisotropic slab

In this analysis, the excitation is taken to be either (1) the lowest-order transverse electric (TE) or the lowest-order transverse magnetic (TM) (i.e. transverse electromagnetic) waves, or (2) a uniform, E- or H-polarized, incident plane wave. As a result of the anisotropy, cross-polarization effects are observed. The formulation of the boundary-value problem is carried out in the Fourier transform domain. Considerable contraction results by using previously developed matrix analysis techniques. In this way, a fruitful integral representation of the tangential components of the magnetic field is first derived in terms of the tangential components of the electric field at the excitation aperture. Next, and after imposing the boundary conditions at the aperture boundary surface, this representation is used as the starting point for a solution on the basis of a moment method (MM) approach using the eigenmodes as basis and weighting functions. Numerical results related to the reflection and coupling coefficients as well as the directive diagrams of the structure are presented in graphical form for various cases. >

Radiation from a flanged parallel-plate waveguide: solution by moment method with inclusion of edge condition

An efficient and accurate method is presented for solving the problem of radiation from a flanged parallel plate waveguide fed with an input incident TE1 mode. By matching the tangential fields, an integral equation with the aperture electric field as the unknown is obtained. The method of moments is used to solve the integral equation, with the chosen basis functions term by term satisfying the £-field edge condition explicitly and the H-field edge condition implicitly. The accuracy and efficiency of the method have been assessed by a study of the convergence pattern and by comparison with other available solutions. The comparison is extended to the case in which the input mode to the parallel-plate waveguide is the TEM.

Radiation from flanged waveguide: Comparison of solutions

The reflection coefficient of the transverse electric (TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> ) mode in a flanged parallel-plate waveguide is considered, its solutions derived by the four different methods are numerically compared.

A method of evaluating the near diffracted field

A simple expression for the diffracted field by a slit or a flanged parallel-plate waveguide is derived from which we can readily evaluate the near field by applying the fast Fourier transform. Some numerical results are presented for the diffracted wave of an isotropic cylindrical wave by an infinitely long slit in a thin conducting screen.

Receiving characteristics of a flanged parallel-plate waveguide

Receiving characteristics of a flanged parallel-plate waveguide

Field distribution in a flanged parallel-plate waveguide

Field distributions in a flanged parallel-plate waveguide have been computed using the Weber-Schafheitlin integral technique. Equiamplitude and equiphase contours are presented in graphical forms for a specific choice of parameters.

Radiation into anisotropic plasma from flanged parallel-plate waveguide

The radiation characteristics of a flanged parallel-plate waveguide in an anisotropic plasma medium are treated as a boundary value problem. Numerical results are presented on the effect of the anisotropic medium on the radiation pattern, the reflection coefficient, and the input impedance for the TEM- and TM01-wave incidence.