3D Transmission Line - CST2013 MWS Examples

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General Description

Here the S-parameter calculation of a transmission line using strip lines in three dimensions is shown. The strip lines on the top surface of the substrate are connected to a short strip line on the bottom surface by small cylinders enabling the bypass of a possible barrier.

Structure Generation

The structure is completely modelled by parametric input referring to a wavelength of 10 mm and thus can easily be modified.

The single components of the device are created as bricks and cylinders, whereby identical parts are mirrored due to the symmetry of the structure. In this sense also a magnetic symmetry plane is specified in x-direction to achieve a reduction of the simulation time.

Solver Setup

In order to enable a transient calculation two waveguide ports are defined at each side of the transmission line as the excitation sources. To examine the device over a broadband frequency range from 0 to 7.5 GHz the signal is determined as a Gaussian impulse. The inhomogeneous port accuracy enhancement is activated for the two inhomogeneous ports to ensure a high accuracy over this broadband frequency range.

Post Processing

Performing a transient calculation using waveguide ports the resulting time signals are converted automatically into the desired scattering parameters. All these results are listed in the navigation tree in the folder 1D Results and demonstrate the propagation characteristics of the transmission line, indicating a proper excitation frequency for monochromatic operation.

Furthermore the calculated port modes of the given waveguide ports can be examined in the folder 2D/3D Results.