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HFSS and Planar EM Simulators >
Setting Up Excitations

Setting Up Excitations

To define a problem’s excitation in the Layout Editor, you can use the following types of excitations:

Edge port	Represents the surface through which a signal enters or exits the geometry.
Gap source	Represents an internal surface through which a signal enters or exits the geometry.
Pad port	Represents a gap source that can wrap around a model’s corners or be located inside a polygon object.
Probe port	Represents a coaxial-type connector with the center pin of the connector extending from the ground plane to any metal layer.
Plane wave	Represents a propagating wave impinging on the geometry.(Planar EM only)

When you specify an excitation for a Planar EM structure, Designer uses the principle of linear superposition to calculate the solution. The signal on each port and mode is solved for separately. Designer sets the signals on all non-zero modes and generates a solution. This procedure is repeated with each port until a solution is generated for each.

The topics for this section include:

Edit Port Excitations

Creating an Edge Port

Creating Coupled Ports From Existing Edge Ports

Creating a Pad Port

Changing the Reference Surface

Reference to Nearest Ground

Creating a Probe Port

Creating a Plane Wave

Renormalizing S-Matrices

De-embedding S-Matrices

Varying the Port Excitation

Differential Pairs

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