Multiple Ports on the Same Face — Ansoft Designer 7.0 在线帮助文档，Ansys Designer 教程

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Multiple Ports on the Same Face

Visualize a port face on a microstrip that contains two conducting strips side by side as two separate ports. If the two ports are defined as being separate, Designer simulates the case in which the two ports are connected to uncoupled transmission structures. It is as if a conductive wall separates the excitation currents.

Input Impedance

Gap sources are similar to edge ports, but they are not connected to an extended transmission line, which becomes longer and more unstable at low frequencies. A gap source is excited directly at the port. Therefore, gap sources increase the problem’s accuracy at low frequencies. They also eliminate potential overlapping problems within the model.

Input impedance is computed at the port edge as follows:

The dominant current pattern (mode) at the port is solved. A Y-matrix formulation is then calculated, from which the S-parameters are calculated.

Only one port mode is allowed at a gap source. Use an edge port if there are one or more modes propagating on the port, such as on a coupled strip port.

Use gap sources for microstrip, strip line, and CPW transmission line structures. Gap sources can be used in models that contain coaxial probe ports. Gap sources work well when the port is electrically close to a ground. They should also be used in structures that have high loss.

Note

Gap sources cannot be located inside of a metal polygon object unless it is connected to a void.

Gap sources located over apertures in metallized signal layers can generate incorrect results. Designer will automatically display a warning message if referencing a gap source to the nearest ground would produce such an error.


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