How to
jMMTL is intended to compute a characteristic impedance of a 2D structure.
The tool have predefined structures and a visual structure editor.
Choose a set of structures, a structure from the list, enter values, press the "Compute" button.
Press the "Edit Structure" button to edit the structure in the "Geometry Editor".
Lossless calculation is used.
Results are slightly different from the TNT-MMTL because constants and values have different precision.
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Structures
Press the "Structure" in the "File" menu to switch to the panel with predefined structures.
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Geometry Editor
Press the "New structure" in the "File" menu to switch to the "Geometry Editor".
- Build a structure and see how it looks.
- Enter solver settings and calculate structure parameters.
- Save and load a structure into a text "xsctn" file to exchange with the original "TNT-MMTL" tool.
A structure must have a bottom ground plane. There can be bottom and top ground planes.
Ground Plane
- Name
- Just some text
- Thickness
- It is used only for visualisation
Dielectric Layer
- Name
- Some text
- Permittivity
- A relative permittivity or dielectric constant, εr, of a used dielectric
- Thickness
- Thickness in a selected unit
- Permeability
- A relative permeability, μr, Always 1
- Loss Tangent
- Always 0
Dielectric Block
- Name
- Some text
- Permittivity
- A relative permittivity or dielectric constant, εr, of a used dielectric
- Permeability
- Always 1
- Loss Tangent
- Always 0
- Width
- A width in a specified unit
- Height
- A height in a specified unit
- X offset
- An X coordinate of the left edge
- Y offset
- It is not used
Rectangle Conductors
- Name
- Some text. A name of a grounded conductor must start from "gr". Use a checkbox to make it more clear.
- Conductivity
- A conductivity of a material used to compute DC resistance. 5.8e7 for copper.
- Width
- A width in a specified unit
- Height
- A height in a specified unit
- X offset
- An X coordinate of the left edge
- Y offset
- An Y coordinate of the left edge
- Number
- A number of copies along the X axis
- Pitch
- A distance between centers of the copies
Trapezoid Conductors
- Name
- Some text. A name of a grounded conductor must start from "gr". Use a checkbox to make it more clear.
- Conductivity
- A conductivity of a material used to compute DC resistance. 5.8e7 for copper.
- Top Width, Bottom Width
- A top and bottom width in a specified unit
- Height
- A height in a specified unit
- X offset
- An X coordinate of the left edge
- Y offset
- An Y coordinate of the left edge
- Number
- A number of copies along the X axis
- Pitch
- A distance between centers of the copies
Circle Conductors
- Name
- Some text. A name of a grounded conductor must start from "gr". Use a checkbox to make it more clear.
- Conductivity
- A conductivity of a material used to compute DC resistance. 5.8e7 for copper.
- Permeability
- Always 1
- Top Width, Bottom Width
- A top and bottom width in a specified unit
- Height
- A height in a specified unit
- X offset
- An X coordinate of the left edge
- Y offset
- An Y coordinate of the left edge
- Number
- A number of copies along the X axis
- Pitch
- A distance between centers of the copies
Simulation Control
- Conductor and Dielectric Segments
- It is mesh parameters that BEM MMTL will use to discretize the cross section components.
Conductors and dielectric segments can be meshed with different resolutions.
These values control (to some extent) the simulation accuracy.
Larger numbers may give a more accurate answer, but also result in more computation time.
Really large numbers (like 100) are not recommended.
- Dielectric Segments
- It is used only for visualisation
Crosstalk
Circuit parameters are considered frequency independent.
- Coupling Length
- A conductor length in a selected unit
- Rise Time
- Rise time in pico seconds.
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About
jMMTL v1.0
The code is based on the TNT-MMTL v1.2.2 Electromagnetic Simulator code.
Copyright (C) Mayo Foundation 2002-2004.
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