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Home / Examples / Electromagnetic Analysis [Hertz] / Example 8: Open Stub
Example 8: Open Stub
General
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An open stub formed on a dielectric substrate is characterized.
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Unless specified in the list below, the default conditions will be applied.
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Obtain this session's project file. (Right-click and choose 'Save link as')
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Results will vary depending on Femtet version and the PC environment.
Analysis Space
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Item |
Settings |
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Analysis Space |
3D |
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Model Unit |
mm |
Analysis Conditions
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Item |
Settings |
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Solver |
Electromagnetic Analysis [Hertz] |
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Analysis Type |
Harmonic Analysis |
The harmonic analysis is set as follows.
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Tab |
Setting Item |
Settings |
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Mesh Tab |
Element type |
2nd-order Element |
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Adaptive Meshing |
Select [Apply adaptive meshing]. |
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Frequency-Dependent Meshing |
Reference frequency: 5x109 [Hz] Select [The conductor bodies thicker than the skin depth constitute the boundary condition]. |
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Harmonic analysis |
Sweep Type |
Select [Linear Step by Number of Divisions] |
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Sweep Setting |
Minimum: 1×109 [Hz] Maximum: 10x109 [Hz] Division Number: 100 |
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Sweep Setting |
Select Fast sweep S-parameter Tolerance: 1x10-3 |
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Input |
1.0 [W] |
Model
An open stub is formed on a substrate (SUB) with microstrip lines. A box for the air domain is created on the substrate.
This model has two ports: PORT1 and PORT2. An integration path is set up on each port.
Body Attributes and Materials
You may give the thickness to the electrodes (EC bodies) in the body attribute. That does not affect the simulation.
(Related information: Analysis Condition, Electromagnetic Analysis tab, and "Take thickness of face/edge electrode into account")
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Body Number/Type |
Body Attribute Name |
Material Name |
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0/Solid |
SUB |
006_Glass_epoxy * |
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1/Sheet |
EC |
003_Ag |
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2/Sheet |
EC |
003_Ag |
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3/Solid |
AIR |
001_Air(*) |
* Available from the material DB
Boundary Conditions
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Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
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PORT1/Face |
Electric |
Port |
Reference Impedance: Select [Specify] and enter 50 ohms. Number of Modes Number of Precalculated Modes: 5 Number of Modes Used in the Actual 3D Analysis: 1 Select Modes: None |
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PORT2/Face |
Electric |
Port |
Same as Above. |
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Outer Boundary Condition |
Electric |
Electric Wall |
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Results
The reflection and the transmission characteristics of the open stub are shown below.
