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# Example18Multilayer Capacitor

### General

• A multilayer capacitor placed on a substrate is analyzed.

• Microstrip lines connect the capacitor’s electrodes and the ports on the substrate.

• S-parameters and the electromagnetic field are solved.

• [How to Reduce the Calculation Time]

### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

 Item Settings Solvers Electromagnetic Analysis [Hertz] Analysis Type Harmonic analysis Options Select “Ignore the influence of face/edge electrode thickness” *

* This is the default setting. There are no face electrodes with this model. Therefore it is irrelevant to select it or not.

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Mesh tab, Harmonic analysis tab and Open boundary tab are set as follows.

 Tab Setting Item Settings Mesh Tab Element type 2nd-order element Multigrid/Adaptive Mesh Method Select “Use the adaptive mesh method”. Frequency-Dependent Meshing Reference frequency: 1×10^9[Hz] Select “The conductor bodies thicker than the skin depth constitute the boundary condition.” Harmonic analysis Frequency Minimum: 1×10^7[Hz] Maximum: 5×10^9[Hz] Sweep Type Select “Log step” Division number: 100 Sweep Setting Select discrete sweep Input 1.0[W] Open boundary Type Absorbing boundary Order of Absorbing Boundary 1st degree

“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

 Body Number/Type Body Attribute Name Material Name 0/Solid SUBSTRATE 006_Glass_epoxy * 1/Solid MLCC CERAMICS 2/Solid AIR 000_Air(*) 3-8/Sheet ELECTRODE 003_Ag *

* Available from the Material DB

 Body Attribute Name Tab Properties ELECTRODE Thickness/Width Thickness of Sheet Body: 2.0×10^-2[mm] *

* The unit is [mm] as specified in the analysis condition.

 Material Name Tab Properties CERAMICS Permittivity Relative permittivity: 90 tanD: 2.0×10^-4

### Boundary Conditions

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings AUTO_PORT_1/Face Electric I/O Port AUTO_PORT_2/Face Electric I/O Port Outer Boundary Condition Electric Electric wall

### Results

The current density vectors are shown below.

The frequency characteristics of S-parameters are as follows. There is a resonance around 3[GHz].

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