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HFSS15: Assigning Lumped RLC Boundaries
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A lumped RLC boundary represents a parallel combination of lumped resistor, inductor, and/or capacitor applied to a surface. Multiple RLC boundaries can be used to model other circuit configurations. For example, a lumped RLC serial circuit connection can be modeled with three connected RLC surfaces: one with only resistance, one with only inductance, and one with only capacitance.
To create a lumped RLC boundary:
1. Select a surface on which to assign the boundary and click HFSS or HFSS-IE>Boundaries>Assign>Lumped RLC to bring up the Lumped RLC Boundary dialog box.
2. Select Resistance, Inductance, and Capacitance as needed and specify values and units for each selected element. Optionally, you can assign a variable to any of these values.
3. To specify where on the surface the current and voltage will be controlled, define a Current Flow Line. The selection field initially appears as Undefined. Select New Line to define a vector line on the boundary surface.
Note | HFSS and HFSS-IE assume the lumped RLC is assigned to a rectangular face. If you assign a non-rectangular face, HFSS and HFSS-IE issue a warning, but proceed with the solution. Using a non-rectangular face can result in less accurate representation of the lumped RLC. See the technical notes on RLC boundaries for more information. |
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