Re: Transmission Line Demonstrators

chris7007 wrote:
Hi, my name's Chris and currently finishing my college degree in EE. I
was really interested in leaving some sort of legacy for my department
and my professor suggested building a Transmission Line Demonstrator
for her RF and EMC class. I looked up online and could only find 2
sites, one that sold them, and another that gave a very short
description.

Has anyone here ever tried to build one or has any idea what it
entails, as well as any references anyone might have? The help is
greatly appreciated. This isn't for a project by the way, its just one
thing I want to do for my school



Chris,

You can build a very nice legacy device by making a coaxial air line.

this would be two tubes one centered within the other one. by selecting the id an od you can very close 50 ohm structure, a structure 60- 42 ohms would be great.

place a suitable rf connector on each to terminate the air line. the connector wail enable connecting sources or vna on one end, and loads, or test device on the other end.

In the middle of the air txline make a small hole 3/8 od for inserting voltage current or power flow probes.

I would make the air line 5-12 inches to make is useful an practical to handle mount etc.


Just measuring the tx lines impedance and loss tangent is an intersing exercise for graduate students.

undergrads can watch what happens for matched and mis matched conditions,,,, others may use it to set up a know field at the hole access pint and then use this field to calibrate field sensor that other graduate students can make to obtain various bandwidths, sensiivites, etc.

Lots of fun, I have done this myself..
Best regards,

marc Popek

www.fwt.niat.net and follow the links to the Center for energy research

http://www.youtube.com/profile?user=LVMarc

products
.

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