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The Ansoft designer results are take from :
1. Yang, F., J. Chen, R. Qiang, and A. Elsherbeni (2007), A simple and efficient FDTD/PBC algorithm for scattering
analysis of periodic structures, Radio Sci., 42, RS4004, doi:10.1029/2006RS003526.
2. Elsherbeni and Demir – The Finite-Difference Time-Domain Method for Electromagnetics
with MATLAB. Simulations, 2nd Edition (2015)
Example results and CAD download
Example_DFSS_Theta180
Example_DFSS_Theta150
Example_DFSS_Theta120
Example_DFSS_Theta180_Phi21.3
Example_DFSS_Theta0_Phi21.3
https://mega.nz/#!ap0zGAjb!PdOooi6LCTBo_r3KPho66ODWdU2qBJkF4_ZhgkfHYbg
*.FCstd is the save file of FreeCAD
Add the boundary of the CAD files (FreeCAD)
Add the boundary of the CAD files (FreeCAD)
Reference : 3D-CAD Simulation & Examples
Reference : 3D-CAD Simulation & Examples
Comparison & Reference：1. Yang, F., J. Chen, R. Qiang, and A. Elsherbeni (2007), A simple and efficient FDTD/PBC algorithm for scatteringanalysis of periodic structures, Radio Sci., 42, RS4004, doi:10.1029/2006RS003526.2. Elsherbeni and Demir – The Finite-Difference Time-Domain Method for Electromagneticswith MATLAB. Simulations, 2nd Edition (2015)
Define Parameters
Define Parameters
1. Selected the simulation dimension.
1. Selected the simulation dimension.
2. Define total x, y, z length that equal to CAD, and then set a appropriate resolution.
2. Define total x, y, z length that equal to CAD, and then set a appropriate resolution.
3. Import CAD files.
3. Import CAD files.
4. Define the material of each CAD.
4. Define the material of each CAD.
5. Press【建立網格 Cad to Grids (Create)】button to create simulation grids.
5. Press【建立網格 Cad to Grids (Create)】button to create simulation grids.
A. Define the boundary conditions
A. Define the boundary conditions
B. Press the【創建 (Create)】button => Create the total grid size (Include the boundary condition & add space)
B. Press the【創建 (Create)】button => Create the total grid size (Include the boundary condition & add space)
The incident wave is linear polarization in y axis (pis=90) from upper side(theta =180).
The incident wave is linear polarization in y axis (pis=90) from upper side(theta =180).
Reflection Spectrum observation : + Z direction
Reflection Spectrum observation : + Z direction
Transmission Spectrum observation : - Z direction
Transmission Spectrum observation : - Z direction
instruction webpage: DFT (Observation Range)
instruction webpage: DFT (Observation Range)
C. Import the metal layer, due to the PCB metal layer thickness << delta (dz)
==> using the "Load Wire (*.stl)" function
Patch_patch.stl
Checked out the simulation geometries, and then press 【輸出 Output】button to output the geometries files
Checked out the simulation geometries, and then press 【輸出 Output】button to output the geometries files
Data_Materials.csv // (simulation index of structures)
Data_Materials.csv // (simulation index of structures)
Other simulation files refer to below figures:
Other simulation files refer to below figures:
This is TE (Polar 1) polarization results, The symbol means:
p1 : polarization 1
Py: Poynting (intensity)
real: real part
co : co-polar (coefficient)
cross : cross-polar (coefficient)
Overall means the total energy, here the incident source is normalized to 1
Overall-p1-Py-real
Overall : Transmission (intensity)+ reflection (intensity) = 1 (energy conservation for without loss)
Transmission-p1-Py-real : Transmission intensity : T
Reflection-p1-Py-real : Reflection intensity : R
The relationship of transmission intensity of co-polar, cross polar are
Transmission-p1-co = co-polar : |t-co|, which is polarization direction same to incident source
Transmission-p1-cross = co-polar: |t-cross|, which is polarization direction orthogonal (90 degrees) with incident source
T (intensity) = |t-co|^2+|t-cross|^2
R (intensity) = |r-co|^2+|r-cross|^2
The relationship of these
Overall =1= T (intensity)+ R (intensity) = |t-co|^2+|t-cross|^2 + |r-co|^2+|r-cross|^2
TM, LHCP, RHCP are the same
For the oblique incident 150 degrees (30 degrees in paper), 120 degrees(60 degrees in paper) results:
The simulation examples download:
Example_DFSS_Theta180
Example_DFSS_Theta150
Example_DFSS_Theta120
https://mega.nz/#!ap0zGAjb!PdOooi6LCTBo_r3KPho66ODWdU2qBJkF4_ZhgkfHYbg
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==== Example 2 ====
=====================================
in ref.(2), Chapter 14
2. Elsherbeni and Demir – The Finite-Difference Time-Domain Method for Electromagnetics
with MATLAB. Simulations, 2nd Edition (2015)
The condition : Kx=20 radian/meter, Ky= 7.8 radian/meter
Method 1 : use periodic boundary condition
Kx=20 radian/meter, Ky= 7.8 radian/meter
and then the phi= atan2(Ky,Kx) = 21.3058 degree
set Phi = 21.3 degrees, and the other are all the same
The simulation examples download:
Example_DFSS_Theta180_Phi21.3
https://mega.nz/#!ap0zGAjb!PdOooi6LCTBo_r3KPho66ODWdU2qBJkF4_ZhgkfHYbg
The default define z- is port 1, z+ is port 2, and the relation between T&R and S-parameter as shown in figure.
From up (z+) side incident (source from port 2, theta =180 degree) can get S12, S22 co-polar and cross-polar
if we want get the Scattering parameters S11 and S21, then need to run another simulation that from z- side (source from port 1, theta =0 degree) incident
download Example_DFSS_Theta0_Phi21.3
https://mega.nz/#!ap0zGAjb!PdOooi6LCTBo_r3KPho66ODWdU2qBJkF4_ZhgkfHYbg
and then get
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