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Home / Examples / Electromagnetic Analysis [Hertz] / Example 18: Multilayer Capacitor
Example 18: Multilayer Capacitor
General
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A multilayer capacitor placed on a substrate is analyzed.
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Microstrip lines connect the capacitor's electrodes and the ports on the substrate.
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S-parameters and the electromagnetic field are solved.
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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 |
Harmonic Analysis tab and Open Boundary tab are 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: 1x109 [Hz] Select [The conductor bodies thicker than the skin depth constitute the boundary condition]. |
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Harmonic analysis |
Sweep Type |
Select [Log Step by Division Number] |
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Sweep Setting |
Minimum: 1x107 [Hz] Maximum: 5x109 [Hz] Division: 100 |
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Sweep Setting |
Select [Discrete Sweep] * |
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Input |
1.0 [W] |
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Open Boundary |
Type |
Absorbing Boundary |
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Order of Absorbing Boundary |
1st-order |
*Fast sweep is deselected as the frequency is low.
Model
A multilayer capacitor is placed on a substrate. Microstrip lines connect the capacitor's electrodes and the ports on the substrate.
Body Attributes and Materials
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Body Number/Type |
Body Attribute Name |
Material Name |
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0/Solid |
SUBSTRATE |
006_Glass_epoxy * |
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1/Solid |
MLCC |
CERAMICS |
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2/Solid |
AIR |
000_Air(*) |
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3-8/Sheet |
ELECTRODE |
003_Ag * |
* Available from the material DB
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Body Attribute Name |
Tab |
Properties |
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ELECTRODE |
Thickness/Width |
Thickness of Sheet Body: 2.0×10-2 * |
* The unit is [mm] as specified in the analysis condition.
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Material Name |
Tab |
Properties |
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CERAMICS |
Permittivity |
Relative Permittivity: 90 Dielectric Tangent: 2.0×10-4 |
Boundary Conditions
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Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
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AUTO_PORT_1/Face |
Electric |
Port |
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AUTO_PORT_2/Face |
Electric |
Port |
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Outer Boundary Condition |
Electric |
Electric Wall |
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Results
The current density vectors are shown below.
The frequency response of S-parameters is as follows. There is a resonance around 3 [GHz].
