Example 18: 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
Solver	Electromagnetic Analysis [Hertz]
Analysis Type	Harmonic Analysis

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 [Apply adaptive meshing].
	Frequency-Dependent Meshing	Reference Frequency: 1x109 [Hz] Select [The conductor bodies thicker than the skin depth constitute the boundary condition].
Harmonic analysis	Sweep Type	Select [Log Step by Division Number]
	Sweep Setting	Minimum: 1x107 [Hz] Maximum: 5x109 [Hz] Division: 100
	Sweep Setting	Select [Discrete Sweep] *
	Input	1.0 [W]
Open Boundary	Type	Absorbing Boundary
Open Boundary	Order of Absorbing Boundary	1st-order

*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 *

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

Material Name

Tab

Properties

CERAMICS

Permittivity

Relative Permittivity: 90

Tanδ: 2.0×10-4

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
AUTO_PORT_1/Face	Electric	Port
AUTO_PORT_2/Face	Electric	Port
Outer Boundary Condition	Electric	Electric Wall

The current density vectors are shown below.

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