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External Ports
<Port Number>PropertiesGeneralPort number
The port number is displayed. The port number can be edited in the edit field.
Mode frame
Higher order mode: Indicates that a higher-order mode is considered at this external port. This modification affects only the external port’s name. The considered mode corresponds to the mode defined for the internal port that it is connected with.
Number: The number describes the higher order mode to consider.
Impedance frame
Block dependent: Indicates that this external port will use the impedance of the connected block port if it is connected to exactly one block port. If the external port is connected to more than one block port, a default impedance will be used.
Fixed: Indicates that this external port is associated with a fixed impedance.
Impedance: Specify the real and imaginary part of the fixed impedance here. You may enter any numerical expression, using parameters if desired. If the parameter Frequency is used it will cause the impedance to become frequency dependent: The expression will be evaluated over the whole simulation frequency range, with Frequency set to each actual frequency, using the global frequency unit.
Please note that the definition of scattering parameters with complex port impedances is not unique. CST DESIGN STUDIO™ calculates scattering parameters based on power waves. Scattering parameters based on pseudo waves may be calculated as a post processing step.
File dependent: Indicates that this external port is associated with a frequency dependent impedance imported from a file.
Impedances: Use the Browse... button to load impedance values from a TOUCHSTONE file, containing 1port data (.s1p). If the file contains impedances they are used directly. If it contains admittances or reflection coefficients, they are automatically converted to impedances. Please refer to the Touchstone File Block for a description of the TOUCHSTONE file format.
General frame
Differential: Check this control if you want this port to be differential, so that a reference other than common ground can be added.
OK
Accepts your settings and leaves the dialog box.
Cancel
Closes this dialog box without performing any further action.
Apply
Performs your settings without leaving the dialog box.
Help
Shows this help text.
See also