Example18 Multilayer Capacitor

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.

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.

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
Open boundary	Order of Absorbing Boundary	1st degree

“Fast sweep” is deselected as the frequency is low.

A multilayer capacitor is placed on a substrate. Microstrip lines connect the capacitor’s electrodes and the ports on the substrate.

* 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 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

The current density vectors are shown below.

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