# Nodelling multiple interacting microstrip lines

• posted

COuld some electronics guru please shed some light on this ? We know that detailed analytical models(Kirshchning and Jansen, Hammarstadt and Jansen, Getsinger, Wheeler etc.,) exist for calculating the homogeneous and frequency dependent characteristic impedances and dielectric constants for two interacting parallel micro strip lines.

The question is, what about several parallel micro strip lines as on a printed circuit board ? A simplistic approach would be to compute the homogeneous and frequency dependent characteristic impedances and dielectric onstants pairwise, i.e., nearest neighbours (adjacent pairs of transmission lines) only, and ignore the interactions of next nearest micro strip lines. How id this tackled in practice ?

• posted

I believe this is done in practice using E&M modeling tools. AFAIK, the open-source ones wouldn't be able to touch this.

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Tim Wescott
Control systems, embedded software and circuit design ```
• posted

Sonnet Lite might do what you want.

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John Larkin         Highland Technology, Inc
picosecond timing   precision measurement  ```
• posted

This might help: "Parallel coupled microstrip lines"

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Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com ```
• posted

Thanks for the URL. Actually, I have written a straightforward C program that couputes both homogeneous and frequency dependent even/odd characteristic impedance and dielectric constants for a pair of parallel coupled micro strip lines using the Hammarstatdt and Jensen formalism. I am now exploring the more exotic cases.

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This exactly the material I have used in my C code.

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I use Appcad for most transmission line calcs. It doesn't do coupled lines, but Txline does.

We occasionally use ATLC or ATLC2 to analyze arbitrary-shape impedances, like on multilayer PC boards. One of my people figured out how to use Sonnet Lite, and it's pretty cool, 2.5D (multiple parallel planes) stuff.

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John Larkin         Highland Technology, Inc

lunatic fringe electronics```
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Including directional couplers...

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Is Nodeling similar to Noodling except for nodes rather than fish?

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