﻿ Parallel-Plate Air-Gap CapacitorExamples | Product | Murata Software Co., Ltd.

# Example1Parallel-Plate Air-Gap Capacitor

### General

• The capacitor analyzed in this exercise consists of two parallel conductive plates which have the potential difference.

• The capacitance, the electric field, and the equipotential map are solved.

• Unless specified in the list below, the default conditions will be applied.

### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

Select “Static analysis” as the potential is static.

 Item Settings Solvers Electric Field Analysis [Coulomb] Analysis Type Static analysis Material Type Dielectric material Options N/A

The electric field exists outside the analysis region. Therefore the open boundary condition below is applied initially.

 Tab Setting Item Settings Open Boundary Tab Type Absorbing boundary Order of Absorbing Boundary 1st degree

### Model

Create 2 sheet bodies for electrodes. Then, specify the voltage on each as boundary condition.

### Body Attributes and Materials

Two sheet bodies are not the physical entity. They are used just to imprint the voltage-specified boundary condition.

They are called “imprinting body”.

You don’t need to set the body attribute or the material property on them.

 Body Number/Type Body Attribute Name Material Name 1/Sheet Imprinting body 2/Sheet Imprinting body

* Available from the Material DB

### Boundary Conditions

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings Electrode1/Face Electric Electric wall Voltage specified, -1[V] Electrode2/Face Electric Electric wall Voltage specified, +1[V] Outer Boundary Condition * Electric Open boundary

To set Outer Boundary Condition, go to the [Model] tab

and click [Outer Boundary Condition] .

### Results

To see the calculation results, go to the [Results] tab

and click [Table] .

The vectors of the electric field are shown below.

The electric field is generated between two plates.

The gradation contour of the voltage on the XZ section is shown below.

The distributed voltage around the electrodes is visually shown.

﻿