How do you measure the impedance of a balanced transmission line?
How do you measure the impedance of a balanced transmission line?
(OP)
The regular RF measurement equipment allows for easy measurement of the impedance of 50 or 75 Ohm unbalanced transmission line. But if you have a symmetrical 2-conductor structure, how do you determine the impedance (without a formula)?
I have a "probe" structure of two parallel flat stainless conductors (.005" x .1") spaced 0.3" apart (center-to-center) within a PTFE lamination. In other words, it looks like a twin-lead with flat conductors.
What is the best measurement setup to measure the impedance? How would you do it if you didn't have access to a network analyzer?
I have a "probe" structure of two parallel flat stainless conductors (.005" x .1") spaced 0.3" apart (center-to-center) within a PTFE lamination. In other words, it looks like a twin-lead with flat conductors.
What is the best measurement setup to measure the impedance? How would you do it if you didn't have access to a network analyzer?
RE: How do you measure the impedance of a balanced transmission line?
You basically can’t make good measurements without some decent test gear.
Then again, if you need to know the impedance you must be driving the system fairly fast anyway. If you can’t measure the effect of changing the sending end terminations it may not be a problem anyway.
RE: How do you measure the impedance of a balanced transmission line?