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quarter wave coaxial cable operation

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yefj

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Hello,There is a basic consept of taking a coaxial cable and making a tapered cut on the outer coating thus creating balanced output from unbalanced input.,I am trying to understand how exactly this consept works.
Why quarter wavelength transformes it into balances?
Thanks.

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I presume you are talking about 1:1 transmission line BALUN (same input and output impedance). It should have constant impedance along the line, which isn't the case with a tapered coax. Can you give us a literature reference?

None of the attachments seems to be related to your question. Please clarify.
 

yes some antennas use this concept. it does not work all that well though. the longer the "tapered cut", the more likely it is to work.

you can see similar things in Microstrip-to-Suspended Stripline transitions.
--- Updated ---

at VHF/UHF frequencies, these things work better:

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