CST2013 MWS Examples: Waveguide Finline Transition

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General Description

In this example the S-parameter calculation of a waveguide finline transition is shown. The tapered finline is located on dielectric substrate material centered in the middle of the waveguide.

Structure Generation

The structure is modelled by defining bricks, extruding curves and using chamfer operations on edges. Identical parts are mirrored. Due to the symmetry of the structure an electric symmetry plane can be used to reduce the calculation domain and thus shorten the simulation time as well.

Solver Setup

A waveguide port and a discrete port are defined as excitation sources. A Gaussian shaped pulse is used for the calculation in the frequency range from 3.4 to 4 GHz. The discrete port is located in the gap of the finline. The longitudinal position of the discrete port has been parameterized in order to use the optimizer to find a position where the S-Parameter S11 is minimized for the entire frequency band.

A field monitor is set up to record the electric field at 3.5 GHz. A second one is used to record the power flow at the same frequency. Also there is a field probe that monitors the electric field at the beginning of the substrate.

Post Processing

The requested S-parameters are automatically derived from the time signals at the two ports and are listed in the navigation tree in the folder 1D Results.

Furthermore the calculated port modes of the given waveguide port can be examined in the folder 2D/3D Results as well as the results of the electric field and the power flow monitor.