Home / Examples / Electromagnetic Analysis [Hertz] / Example 29: Plane Waves
Plane waves are analyzed.
Unless specified in the list below, the default conditions will be applied.
Results will vary depending on Femtet version and the PC environment.
Item |
Settings |
Analysis Space |
3D |
Model Unit |
mm |
Item |
Settings |
Solver |
Electromagnetic Analysis [Hertz] |
Analysis Type |
Harmonic Analysis |
Mesh tab, Harmonic analysis tab and Open boundary tab are set as follows.
Tab |
Setting Item |
Settings |
Harmonic analysis |
Frequency |
Single Frequency 2X109 [Hz] |
Incident wave (plane wave) |
Propagation Direction |
(0, 1, 1) |
Electric Field Vector |
(1, 0, 0) |
|
Open boundary |
Type |
Absorbing Boundary |
Order of Absorbing Boundary |
1st-order |
The model consists of an air cube only: Body_Attribute_001. The open boundary condition is set around the cube.
Body Number/Type |
Body Attribute Name |
Material Name |
0/Solid |
Body_Attribute_001 |
Material_Property_001 |
Material Name |
Tab |
Properties |
Material_Property_001 |
Permeability |
Relative Permeability 1.0 |
Material property_001 |
Permittivity |
Relative Permittivity: 1.0 |
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
Outer Boundary Condition |
Electric |
Open Boundary |
Set on the [Open Boundary] tab of [Analysis Condition]. |
The electric field vectors are shown below. "Maximum value: 1.005", which appears under the color scale,
indicates the maximum value of the electric field vectors set on [Analysis Condition Setting] dialog box - [Incident Wave] tab.
The figure is viewing the YZ plane from positive X direction. The coordinates of the left bottom corner is (x, 0, 0).
The electric field vector at (0, 0, 0) corresponds to the incident waves electric field vector (1, 0, 0).
The propagation direction can be viewed by animation or by incrementing the phase little by little.
The plane waves propagate in the (0, 1, 1) direction.
Fig. 1 Electric Field Vectors
The magnetic field vectors are shown below. The maximum value is 2.664 [mA/m].
It is multiplied by the impedance in vacuum, 377 [Ohm], to give 1. This result is confirmed to be equal to the input electric field, 1 [V/m].
Vectors in Figure 2 are shown on Grids for easy observation.
Fig. 2 Magnetic Field Vectors