|
 |
Problem understanding Twinax - RF Cafe Forums
|
| DanBot
|
|
Post subject: Problem understanding Twinax
Posted: Tue Mar 13, 2012 7:14 am
|
|
Joined: Tue Mar 13, 2012
6:58 am
Posts: 1 |
|
Hi,
I am currently working on an RF problem
that seems to be modelable as twinax joined at the
ends.
Can anybody point ot me to a place
or help me understand if there would be a capacitance
between the two cables when they are joined at the
end, or does the short at the end cancel the capacitive
coupling between the two coaxial cables?
Thanks in advance.
|
|
| |
|
 |
|
Kirt Blattenberger
|
|
Post subject: Re: Problem understanding Twinax
Posted: Tue Mar 13, 2012 12:57 pm
|
|
Joined: Sun Aug 03, 2003
2:02 pm
Posts: 308
Location: Erie, PA
|
Greetings DanBot: Here is a paper from Ansoft
on modeling twinax cable, but it does not specifically
address your inter-conductor capacitance question.
http://ecadigitallibrary.com/pdf/58thECTC/s37p13p5.pdf
A good source for searching for an answer is
to look up MlL-STD-1553B.
It uses twinax for the interface, and there is a
plethora of articles, app notes, and datasheets
available. You might try calling Belden or any manufacturer
and ask to speak to an Applications Engineer. Almost
certainly you will get an answer.
_________________
- Kirt Blattenberger
RF Cafe Progenitor & Webmaster
|
|
| |
|
|
|
|
SunshineDesign |
|
Post subject: Re: Problem understanding Twinax
Posted: Tue Mar 13, 2012 9:38 pm
|
|
Joined: Sat Nov 08, 2008
11:35 pm
Posts: 3
Location: Ramona, CA
|
|
The capacitance would only be negated at DC. With
RF you would still have dynamic varying charge distribution
down the lines which would vary line to line and
produce capacitance on the line. So at RF this capacitance
cannot be ignored.
_________________
Sunshine Design Engineering
Services
|
|
Posted 11/12/2012
|
|
|
|
