CAE Software【Femtet】Murata Software Co., Ltd.
General
The filtering characteristics of microstrip lines are analyzed.
Unless specified in the list below, the default conditions will be applied.
[How to Reduce the Calculation Time]
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
Item |
Settings |
Solver |
Electromagnetic Analysis [Hertz] |
Analysis Type |
Harmonic analysis |
Options |
Select “Ignore the influence of face/edge electrode thickness” * |
Correction coefficient for the characteristic impedance: 0.5 * |
* This is the default setting. There are no face electrodes with this model. Therefore it is irrelevant to select it or not.
* If the face of symmetry of the 1/2 model is magnetic wall, the correction coefficient is 0.5.
If the face of symmetry is electric wall, the correction coefficient is 2.
Mesh tab, Harmonic analysis tab and Open boundary tab are set as follows.
Tabs |
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: 1×10^9[Hz] Maximum: 20×10^9[Hz] |
Sweep Type |
Select Linear step by division number Division number: 100 |
|
Sweep Setting |
Select Fast sweep |
|
Input |
1.0[W} |
|
Open boundary |
Type |
Absorbing boundary |
Order of Absorbing Boundary |
1st degree |
As the model is symmetric, a half model is created and analyzed. The metal sheet body (METAL) is constructed on the surface of the substrate (SUB).
The air layer (AIR) is rested on top of them. Electric wall (E) is set around the air.
The face of symmetry is set with magnetic wall, as the magnetic filed crosses the face perpendicularly.
You may give the thickness to METAL in the body attribute. That does not affect the simulation.
(Related information: Analysis Condition, Electromagnetic Analysis tab, and “Ignore the influence of face/edge electrode thickness”)
Body Number/Type |
Body Attribute Name |
Material Name |
0/Solid |
SUB |
001_Alumina |
10/Sheet |
METAL |
008_Cu |
11/Solid |
AIR |
000_Air(*) |
* Available from the Material DB
Boundary Conditions
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
SYM_MW/Face |
Symmetry/Continuity |
Reflective |
Magnetic wall |
INTEG/Edge |
Electric |
Integral path |
|
PORT1/Face |
Electric |
I/O Port |
Reference Impedance: Enter 50[Ohm] |
PORT2/Face |
Electric |
I/O Port |
Reference Impedance: |
Outer Boundary Condition |
Electric |
Electric wall |
|
SYM_MW is set with reflective symmetry and magnetic wall on Symmetry/Continuity tab, which is effectively the same as selecting magnetic wall on Electric tab.
The S-parameter frequency characteristics of the microstrip lines are shown below.