Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

quarter wave coaxial cable operation

Status
Not open for further replies.

yefj

Advanced Member level 2
Joined
Sep 12, 2019
Messages
653
Helped
0
Reputation
0
Reaction score
2
Trophy points
18
Activity points
3,577
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.

1617276611675.png
 

Attachments

  • 1617269094482.png
    1617269094482.png
    249.4 KB · Views: 52
  • 1617271562683.png
    1617271562683.png
    1.6 MB · Views: 46
  • 1617271664572.png
    1617271664572.png
    160.3 KB · Views: 49
  • 1617271881754.png
    1617271881754.png
    31.7 KB · Views: 50

FvM

Super Moderator
Staff member
Joined
Jan 22, 2008
Messages
50,808
Helped
14,603
Reputation
29,481
Reaction score
13,688
Trophy points
1,393
Location
Bochum, Germany
Activity points
290,925
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.
 

biff44

Advanced Member level 5
Joined
Dec 24, 2004
Messages
5,006
Helped
1,374
Reputation
2,744
Reaction score
1,048
Trophy points
1,393
Location
New England, USA
Activity points
37,669
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:

1618328132125.png
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top