*Experiment data refer to paper :

Comparison & Reference：

D. M. Sheen , S. M. Ali , M. D. Abouzahara and J. A. Kong "Application of the three-dimensional Finite Difference Time Domain Method to the analysis of planner Microstrip Circuits", IEEE Trans. On Microwave Theory and Techniques, vol. 38, no. 7, pp.849 -857 1990

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=55775&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel1%2F22%2F2016%2F00055775.pdf%3Farnumber%3D55775

*FEKO data refer to the FEKO website :

https://www.feko.info/applications/white-papers/low-pass-microstrip-filter

範例結果與CAD下載:

https://drive.google.com/open?id=18OEf1V9gk-jAW4rkCg-j3aWVQFkxCgeA

其中*.FCstd是FreeCAD的存檔

Add the boundary of the CAD files (FreeCAD)

Reference : 3D-CAD Simulation & Examples

Define Parameters

A.Main-Setup

1. Selected the simulation dimension.

2. Define total x, y, z length that equal to CAD, and then set a appropriate resolution.

3. Import CAD files.

4. Define the material of each CAD.

5. Press【建立網格 Cad to Grids (Create)】button to create simulation grids.

a.(Substrate DK = 2.2)

b. Due to the PCB metal layer thickness much less than resolution delta (metal layer thickness << dz),

the metal layer will be import by using "Load Wire (*.stl)" function in 【Probe & Lumped】

B.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)

C.Wave & Observation

In this case, wave source use "Voltage Source"，checked (None)

D. Probe & Lumped

here using the PCB : Substrate DK=2.2,

A. define the Voltage Source

B. define the Probe V & I

C. Import the metal layer, due to the PCB metal layer thickness << delta (dz)

==> using the "Load Wire (*.stl)" function

Low_pass_sub_with_BC.stl

Low_pass_top_withBC.stl

Low_pass_bottom_withBC.stl

Port 1 :

Defined input side:

a. connect to Voltage Source (at least to has 1 signal source, Voltage or Current)

b. Probe Voltage

c. Probe Current

Port 2 ~ Port N :

Defined output side :

a. connect to Resistor

b. Probe Voltage

c. Probe Current

E. Geometries. Design

Checked out the simulation geometries, and then press 【輸出 Output】button to output the geometries files

Data_Materials.csv // (simulation index of structures)

Other simulation files refer to below figures:

F.Spectrum & Field Pattern

1. Set the Spectrum Analysis & Wavelength range

2. Check out the source

G.Calculation

1. Set the simulation time setp

2. Save parameters

3. Calculation

H.Result Analysis

★(Result Analysis)：

頻譜 (Spectrum) : Analysis the spectrum