[t_chiba]

>https://www.edaboard.com/#analog-design.10

Very interesting.

Thank you for your response.

The simulator is useful but difficult.

I will continue to study it.
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[t_chiba]

Thanks for the interesting web.

>Higher mode effects.
I don’t know much about it, but I think it is possible.

For example.
When there are dk1 and df0
there is no difference between the waveforms of port50Ω/line50Ω and port51Ω/line51Ω.

When dk4.3 and df0.021 (FR-4)
There is a difference in waveform shape between port50Ω/line50Ω and port51Ω/line51Ω.

*What is noteworthy is not the value but the waveform.

When port impedance and line impedance match, the waveform is collapsed.

QUCSSTUDIO/CST has the same behavior.
SONNET/Hyperlynx behaves differently than QUCSSTUDIO/CST.

I do not know what is the correct behavior, but can I assume that QUCSSTUDIO is correct?

 

 

 
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Attachments:

1. 

   dk1_port50_line50.png
   

2. 

   dk1_port51_line51.png
   

3. 

   Dk43_port50_line50.png
   

4. 

   Dk43_port51_line50.png
   

[t_chiba]

Thank you.

I see the same results for QUCSSTUDIO and CST.

However, I do not know if it is a bug in SONNET.
I had a friend analyze it with Hyperlynx and it was the same as SONNET.

When port impedance and line impedance match.
Is it correct behavior that the waveform is corrupted?

 
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[t_chiba]

Hello carsten

sch and waveform.
75 ohm is disturbed around 12 GHz.

 
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Attachments:

1. QUCSSTUDIO_75.zip

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