The boundary conditions for x and y planes are set to electric or Et=0, which is equivalent to PEC, while for the two boundary conditions in z-direction have been defined as periodic in order to model an infinite extent of the proposed helical inner conductor coax unit ell. (Inner&outer conductor, holders) Boundary Conditions Fig.3 mesh setting of the model components. Other elements: Meshgroup2 The automesh option is enabled. Click on the object then choose the Local mesh properties and set it as the following suggestions: Vacuum: Meshgroup1 The automesh option is disabled for the two inlets which are not parallel to the coordinate axes. 1Ģ Mesh setting: Click on the objects in navigation tree and R. Background Material: Fig.2 Background material setting. Fig.1 (a) inner conductor (b) outer conductor (c) vacuum (d) dielectric holder Frequency Range The frequency range starts at DC and ends at 20 GHz.
This example already is available in example folder of CST MWS in path of: C:\Program Files (x86)\cst STUDIO SUITE 2013\Examples\MWS\Eigenmode\TET\Slow Wave\helix.cst Structure description: Inner conductor (Fig.1(a)) is a helical metal ribbon which has been hold by three dielectric bricks (d) inside a PEC cylindrical hole (b) as outer conductor.
Dispersion Diagram Example 1: Slow Wave Helix General Description This example demonstrates an eigenmode calculation using periodic boundaries in z-direction and a very meaningful example for showing how we can get the dispersion diagram in CST MWS for periodic structures. I hope this article could be helpful for the students who are love Electromagnetic! Thanks to Dr Miguel Navarro-Cía Imperial College London for his valuable comment. In this article two examples that could clearly show the right way of getting this report including two extra Matlab code scripts, are presented. 1 One of the most important reports in metamaterial topics is Dispersion curve, which determines the band-gap behavior of the band-gap structures.
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