Measuring characteristic impedance as suggested by KRAUS' book

[iochoa2016]

Can someone provide more information about this method to measure chracteristic impedance using resistance paper?. Kraus' book claims that the characteristic impedance can be measured by simple dc measurement. It even shows a case to mesure the impedance of a coaxial cable with square outer conductor (chapter 10).
Has anybody seen this method? is it reliable? any reference or video?

Thanks

 

[berkeman]

Actually, it seems more appropriate for you to give us some links to read up on this. I've never heard of a DC method for measuring $Z_0$

 

[iochoa2016]

The book I was referring to is third edition. However just found out that edition 1 and 2 have special section about this method. My understanding is that the characteristic impedance can be determined using a multimeter. the section geometry of the cable has to be drawn on this paper.

 

[rude man]

Can someone provide more information about this method to measure chracteristic impedance using resistance paper?. Kraus' book claims that the characteristic impedance can be measured by simple dc measurement. It even shows a case to mesure the impedance of a coaxial cable with square outer conductor (chapter 10).
Has anybody seen this method? is it reliable? any reference or video?

Thanks

The author's name should probably be spelled KRAUSS, the author of the well-known textbook Antennas.

Where did you get the text you illustrate? Seems that you have all the info you need. The method seems to consist of drawing a model of the cable on resistance paper then applying a VOM. Sounds very interesting and I think you should reveal what you have on the subject to us.

 

[DaveE]

Can someone provide more information about this method to measure chracteristic impedance using resistance paper?. Kraus' book claims that the characteristic impedance can be measured by simple dc measurement. It even shows a case to mesure the impedance of a coaxial cable with square outer conductor (chapter 10).
Has anybody seen this method? is it reliable? any reference or video?

Thanks

Interesting. Nope, never seen or heard of this. IRL, no one would actually ever do this. For one thing, we don't have or ever buy resistance paper. This is why we all have computers in our office.

 

[tech99]

I cannot seem to find this in my edition of the book Antennas, by J D Kraus with single S, but I do remember reading about it. I seem to remember that the paths taken by current on the paper are the analogue of the the electric field lines. The potential along a line is the analogue of the B field. There is a similar graphical method for Zo of a transmission line of arbitrary shape where you draw a cross section and draw estimated field lines for E. Next, construct the B lines by making curved "squares". You count how many squares between the conductors (a) and then how many around the inner conductor (b). Then Zo = 377a/b.

 

[berkeman]

I cannot seem to find this in my edition of the book Antennas, by J D Kraus with single S, but I do remember reading about it.

I'm not seeing anything like it in Stutzman and Thiele either...

 

[Klystron]

Please confirm your specific author and book. The name Kraus and variations such as Krauss are common in STEM publications.

I dimly remember using conductive paper to model DC circuits and craft simple resistors in grade school. Antennae and other loads were often modeled as a characteristic or collective impedance in RF classes.

 

[rude man]

I cannot seem to find this in my edition of the book Antennas, by J D Kraus with single S, but I do remember reading about it. I seem to remember that the paths taken by current on the paper are the analogue of the the electric field lines. The potential along a line is the analogue of the B field. There is a similar graphical method for Zo of a transmission line of arbitrary shape where you draw a cross section and draw estimated field lines for E. Next, construct the B lines by making curved "squares". You count how many squares between the conductors (a) and then how many around the inner conductor (b). Then Zo = 377a/b.

Can someone provide more information about this method to measure chracteristic impedance using resistance paper?. Kraus' book claims that the characteristic impedance can be measured by simple dc measurement. It even shows a case to mesure the impedance of a coaxial cable with square outer conductor (chapter 10).
Has anybody seen this method? is it reliable? any reference or video?

Thanks

You're right, sorry. It's Kraus, not Krauss.
But still - where do the pictures you posted come from?

 

[iochoa2016]

You're right, sorry. It's Kraus, not Krauss.
But still - where do the pictures you posted come from?

Electromagnetics by John D. Kraus

 

[rude man]

Electromagnetics by John D. Kraus

So do you have the book? If not, where did the pics come from?

 

[tech99]

There is an interesting Wiki page about this, https://en.wikipedia.org/wiki/Teledeltos. The paper is called Teledeltos paper and is available from education science suppliers. It looks really interesting for self-education and also solving problems with antennas and transmission lines without the tedium of hours on a computer. I remember I have some of the paper so will give it a try.

 

[iochoa2016]

Yes I have the book. I think I will do this expriment and cross check with experimental value

 

[Swamp Thing]

An analog computer made of paper !