Finline Discontinuities Research Articles

Neural Network Models for Finline Discontinuities

The radial basis network is used as the finline discontinuities electromagnetic artifical neural network(EM‐ANN) models. EM software analysis is employed to characterize finline discontinuities. EM‐ANN models are then trained using physical parameters and frequency as inputs and equivalent electric circuit element parameters of finline discontinuities as outputs. Once trained , the EM‐ANN models can simulate equivalent electric circuit element parameters of finline step, notch and strip very fast and efficiently.

Vector finite element method with mixed-interpolation-type triangular-prism element for waveguide discontinuities

The mixed-interpolation-type triangular-prism element is proposed and an approach based on the finite element method (FEM) with the element is formulated for the analysis of three-dimensional discontinuity problems of electromagnetic waveguides. Here, in order to treat the infinite uniform waveguide with arbitrarily shaped cross section, the eigenmodes of the uniform waveguide are computed by using the FEM with the high-order mixed-interpolation-type triangular element, and the analytical relations in the uniform waveguide are constructed numerically. A finline discontinuity, a dielectric-loaded waveguide, and a junction between a rectangular waveguide and a circular one are analyzed, and then the validity and versatility are confirmed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Full-wave analysis of coupled finline discontinuities

The general discontinuity problem of coupled finline sections is considered. Coupling can occur either along the sides of the slots (parallel coupled finlines) or through their ends (end-coupled finlines). A particular case is the inductive strip discontinuity already addressed in the literature. The analysis is carried out by expanding the fields in terms of TE and TM modes in the transverse direction, using to the generalized transverse resonance method. End effects in coupled finline sections are pointed out. Computed results are in good agreement with data from the literature and from first experiments. >

Equivalent Circuit Modeling of Finline End-Coupling and Short-End By Generalized Transverse Resonance Analysis

The generalized transverse resonance technique for the analysis of finline discontinuities is applied to the modeling of end-coupled finlines in terms of an equivalent circuit suitable for design applications, specifically for bandpass filters. In the limit of zero coupling the equivalent circuit characterization of the end effect is obtained. Good agreement with theoretical and experimental data available in the literature is demonstrated.

The Effect of Complex Modes at Finline Discontinuities

The effect of ignoring complex modes on the solution of finline discontinuity problems is investigated. It is shown that the modal energy distribution at both sides of the discontinuity may be greatly affected by overlooking complex modes, even if they are not strongly excited. lt is also shown that disregarding only one mode of a pair of complex modes, while taking the other into account, results in a contradiction to the principle of complex power continuity across the discontinuity plane. Comparison to measured data is also given to justify the validity of the numerical results.

CAD of Ka-band fin-line filters

A procedure for computer-aided design of fin-line bandpass filters has been developed. Simplicity and accuracy are the features of this procedure owing to the application of a set of efficient close formulas for fin-line discontinuities.

Analysis of higher order modes on unilateral finlines with arbitrarily located slots

In this paper a rigorous method is presented which allows a complete calculation of all modes existing on a unilateral finline with an arbitrarily located slot. Also an investigation of the field distribution is possible. Hereby the behaviour of the different modes can be explained. This method also permits the determination of the propagation properties of higher order modes; thus information is needed for the calculation of finline discontinuities.

Theoretical of and Experimental Investigation Finline Discontinuities

The dominant and the first-five higher order modes in a unilateral finline are precisely described from a thorough spectral-domain approach. Then, using the modal analysis, coupling coefficients between eigenmodes at a discontinuity that have to be introduced into the scattering matrix formulation are directly computed in the spectral-domain, and, consequently, the equivalent circuit parameters of the discontinuity are determined. Finafly, finline discontinuities often used for impedance transformation are investigated and a good agreement between theoretical and experimental results is reported.

Transmission Matrix Representation of Finline Discontinuities

A general treatise of cascaded discontinuities in inhomogeneous waveguides is given and applied to finline circuits. A transmission matrix representation is superior to a scattering matrix representation as far as CPU time is concerned. The scattering matrix is, however, advantageous if the sum of the line lengths separating the discontinuities is large. Numerical examples are given in order to illustrate the effect of increasing the number of modes used to represent the field at both sides of the discontinuity.

Transverse Resonance Analysis Discontinuities of Finline

A method of analysis is proposed for characterizing finline discontinuities. Two conducting or magnetic planes are inserted at some distances away from the discontinuity so as to obtain a closed resonant structure. A transverse resonance technique is then used to compute the resonant frequencies and, from these, the equivalent circuit parameters of the discontinuity. In the particular case when the discontinuity is removed, the method can be used to characterize uniform finlines.