11/15/2023 0 Comments Contour definition in shapeThe use of the appropriate symmetry will speed up considerably the analysis of the discontinuity since less modes are computed. However, if this element is indeed used within an E-plane or H-plane circuit, it is advised to select the general "All-capacitive" or "All-inductive" symmetry option in the specifications of the circuit. Consequently, it can be regarded as a full-wave element. In such a case, the dielectric properties (relative dielectric permittivity and permeability) of this material must be specified.Īlthough this element typically represents an E-plane or H-plane component, the discontinuity accepts any rectangular waveguide mode as excitation. The maximum frequency value is related to the higher resonant mode considered within the discontinuity when all the ports are short-circuited.Ī material different from vacuum can be chosen to fill the discontinuity. Regarding the parameters of the electromagnetic Solver based in the BI-RME 2D method that analyzes this component, the user must fix a maximum frequency value as well. from the discontinuity towards the waveguide). which implies that the waveguide direction points outwards (ie.from the waveguide towards the discontinuity). which implies that the waveguide direction points inwards (ie.v = x for constant-height discontinuities and v = y for constant-width components), can be found following this rule: Knowing one of the waveguide transversal components u, the other that remains unknown v (ie.The constant dimension of the ports will be aligned with u , meaning that for constant-height discontinuities u = y and for constant-width discontinuities u = x.From t and n, vector u can be found as u = t X n.Starting from the 2D arbitrary contour, define the vectors tangent to the contour at the ports ( t) in a counter-clockwise sense and the normal vectors ( n) pointing inwards.Furthermore, an internal contour cannot be placed within another internal contour (see figures). However, this contours cannot intersect or be mutually tangent. Multiple contours are allowed, representing elements that are multiply-connected (ie. It contains a collection of straight segments, circular and/or elliptical arcs that define a closed path (open contours are not supported). mesh file that can be generated and modified using the Arbitrary Shape Editor integrated in FEST3D. The contour of the Arbitrary shape (constant width/height) discontinuity is described in a. Additionally, the user must define whether the 2D contour is extruded in the direction of the width (A) or height (B) of the connected waveguides by choosing the appropriate "Constant height" or "Constant width" radio button. In order to geometrically define a Arbitrary shape (constant width/height) discontinuity, one must describe the arbitrary 2D contour of the component and the position of the ports. In addition, the centre of these waveguides must be contained in the same plane (perpendicular to the constant direction) as shown in the following figures. It is employed to model rectangular waveguide junctions where all the waveguides have the same width (parameter 'A') or height (parameter 'B'). The Arbitrary shape (constant width/height) discontinuity represents a microwave circuit that is constant along a certain direction, but is otherwise arbitrary in the normal plane. How to create, edit and use this element from FEST3D. Using the Arbitrary shape (constant width/height) The possible errors produced by this element, and solutions or workarounds to them. What are the limitations you should be aware of. What is exactly a Arbitrary shape (constant width/height) discontinuity. The Const width/height arbitrary shape discontinuity section contains the following topics:
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