Home / Examples / Electromagnetic Analysis [Hertz] / Example 44: Thin Electrode Elements

Example 44: Thin Electrode Elements

General

• The analysis with thin electrode elements is performed. See [Thin Electrode Elements] for more information.
  

• Thin Electrode Elements Model: Create a sheet body and set the material and the body attribute (sheet thickness) to the sheet body.
  

• For the analysis with the electrode thickness taken into account, select [Take into account thickness of face/edge electrode].
   

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

• Obtain this session's project file. (Right-click and choose 'Save link as')
  
  

• Results will vary depending on Femtet version and the PC environment.

• This example uses the waveguide of parallel plates. Please note that the outer boundary condition is changed to the magnetic wall.

Analysis Conditions

Item	Settings
Solver	Electromagnetic Analysis [Hertz]
Analysis Space	3D
Analysis Type	Harmonic Analysis
Unit	mm
Analysis Options	Electrode Setting Select [Take into account thickness of face/edge electrode]. *

 

 

Harmonic Analysis tab and Open Boundary tab are set as follows.

Tab	Setting Item	Settings
Harmonic Analysis	Frequency	1 [MHz]
	Sweep Type	Single Frequency
	Sweep Setting	Discrete sweep
	Input	1.0 [W]

 

Model

The waveguide of parallel plates is modeled to analyze the propagation of plane waves.

Boundary conditions are set as follows.

Point 1: The outer boundary condition is changed to the magnetic wall.

Point 2: The top and bottom faces are set with the electric wall.

 

 

 

 

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	ParallelPateWaveguide	000_Air *
1/Solid	ParallelPateWaveguide	000_Air *
2/Sheet	ThinFilmElectrode	METAL

* Available from the material DB

 

 

Body Attribute Name	Tab	Material Name
ThinFilmElectrode	Thickness/Width	1.×10-5 [mm]

 

Material Name	Tab	Properties
METAL	Permittivity	Relative Permittivity: 1.0
	Permeability	Relative Permeability 1.0
	Electric Conductivity	Select [Conductor]. Conductivity: 1.e7

Boundary Conditions

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
EW/Face	Electric	Electric Wall
Port_001/Face	Electric	Port	Reference Impedance: Select [Use the characteristic impedance calculated from the port structure].
Port_002/Face
Outer Boundary Condition *	Electric	Magnetic Wall

* Although the default setting of the outer boundary condition is the electric wall, the magnetic wall is used here.

Results

Poynting vectors on average are shown below. The color of the arrow indicates the magnitude of the Poynting vector.

The color changes from red to blue across the thin electrode, indicating the magnitude decreases.

 

 

 

Examine the S-parameters of the waveguide.

[Results]>[Show Results]>[Show Characteristics Chart]>[SYZ Matrix]>[View]>[Matrix Viewer],

S-parameters are displayed.

S21 of -26 [dB] indicates that the electromagnetic waves pass through the thin electrode elements.

 

If the electromagnetic waves fail to pass through, the model may not be set properly.

Please check whether [Take into account thickness of face/edge electrode] is selected.

 

See [Thin Electrode Elements] of technical note for comparison with theoretical values.