Extracting fixture S-params by length difference

  • Thread starter Thread starter yefj
  • Start date Start date
Click For Summary

SUMMARY

The discussion focuses on extracting the S-parameters of rectangular fixtures at the edges of PCB transmission lines by utilizing the length difference between two PCB variants. The user has measured S2P files for both PCBs, which differ only in the inner line length. The established method involves mathematically isolating the fixture S-parameters by comparing the two S2P datasets and applying transmission line theory to account for the length difference. This approach enables accurate de-embedding of fixture effects from measured S-parameters.

PREREQUISITES

  • S-parameter (S2P) file format and interpretation
  • Transmission line theory and propagation constants
  • De-embedding techniques for fixture removal
  • Vector network analyzer (VNA) measurement principles

NEXT STEPS

  • Study mathematical de-embedding methods using length difference in S-parameters
  • Learn to apply transmission line equations to extract fixture S-parameters
  • Explore software tools like MATLAB or Python scikit-rf for S-parameter manipulation
  • Practice measuring and comparing S2P files for PCB fixtures with VNAs

USEFUL FOR

RF engineers, PCB designers, and test engineers involved in high-frequency measurements and fixture de-embedding using S-parameters and vector network analyzers.

yefj
Messages
122
Reaction score
2
Hello , I have two PCB presented in the photo.
The difference between them is the length of the inner line.
I have extracted the s2p of the two of them.
I know that using the length difference we can extract the s-parameters of the rectrangular fixtures at the edges of the line.
What is the proper methematical way to do that using the S2p of these lines?
Thanks.
 

Attachments

  • line_35mm.webp
    line_35mm.webp
    32.1 KB · Views: 4
  • line_50mm.webp
    line_50mm.webp
    27.8 KB · Views: 7

Similar threads

Extracting capacitance and inductance from s-parameters
  • · Replies 4 ·
Replies
4
Views
1K
Interpreting VIA PCB characteristics through TDR and TDT
  • · Replies 23 ·
Replies
23
Views
2K
s-parameter mathematical theory for crosstalk analysis
  • · Replies 5 ·
Replies
5
Views
797
12V DC Motor in Light Fixture with Dimmer & 12V DC to 110V AC Inverter
  • · Replies 21 ·
Replies
21
Views
3K
Theory for a PCB resonator with special kind of mode
  • · Replies 20 ·
Replies
20
Views
2K
Investigating interesting parasitic resonance phenomena
  • · Replies 9 ·
Replies
9
Views
1K
Interpreting TDR properly
  • · Replies 1 ·
Replies
1
Views
421
Microstrip transmission line teardrop-shape power divider question
  • · Replies 10 ·
Replies
10
Views
2K
Need an electromagnet to play Chess
  • · Replies 37 ·
2
Replies
37
Views
6K
S parameters of Common base configuration
  • · Replies 4 ·
Replies
4
Views
2K