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how to measure electrical length with ENA

Question asked by Crystal80 on May 13, 2008
Latest reply on May 14, 2008 by Dr_joel

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what is electrical length, if electrical length is equal to 90 degree, how much wavelength(λ) of it? 1/4λ?

How to use ENA to measure the electrical length of microstripline?
Thanks.

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dgun May 14, 2008 9:55 AM
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Loosely speaking, it is the phase delay of a signal through a network. Yes, mathematically, 90 degrees would be 1/4 wavelength.

There are a few ways to get electrical length, and some care must be taken in measuring it. What will you use the electrical length result for?
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Dr_joel May 14, 2008 10:22 AM
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In common use, electrical length refers the to the group delay, expressed in distance. One might say that a cable has an electrical lenght of 1 ns (group delay) or 30 mm (c*delay = 3e8*1e-9). Thus, electrically the cable looks to be 30 mm long, even if it is only 20 mm long physically, from which one can say the velocity factor is .67 (20/30).

On an ENA, choose "delay" function, which means "group delay".
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how to measure electrical length with ENA

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