Questions tagged [folded-dipole]
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7
questions
17
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5answers
14k views
Why do folded dipoles have greater bandwidth than ordinary resonant dipoles?
This is something I've read in passing, but never encountered an explanation of why. For example, Wikipedia says:
Another common place one can see dipoles is as antennas for the FM band; these are ...
13
votes
5answers
4k views
How does a folded dipole work?
A folded dipole is like an ordinary dipole, but with the ends extended and folded back, until they meet. Although it looks like a loop, I'm told it behaves similarly to a dipole.
How does this thing ...
8
votes
3answers
2k views
What sort of radiation efficiency can one expect from a folded dipole?
It is pretty well established that folded dipoles have much greater acceptable-SWR bandwidth than ordinary dipoles.
Radiation efficiency is simply the quotient of radiated power to the antenna ...
4
votes
2answers
6k views
Coaxial Folded Dipole Antenna Matching Impedance
In http://www.nsw.wicen.org.au/technical/projects/coaxial-folded-dipole-antenna, the guy is using a 50 ohm coax cable to build a folded dipole antenna and claims that this will enable use at 50 ohm (I ...
3
votes
2answers
193 views
How to estimate a dipole feedpoint impedance?
An ideal dipole, at resonance, will have an impedance around 73 ohms. A folded dipole, around 280 ohms.
How can I calculate the impedances when not at resonance? Let's assume I have a span of 15M in ...
0
votes
3answers
245 views
To folded dipole, or not to folded dipole?
I currently operate a 20M half-wave dipole with a balun. It's a little lower than ideal, but it gets me on the air.
I've read about folded dipoles. But I've found contradicting information about them....
0
votes
1answer
83 views
How should I stack these folded dipoles?
Looking to stack these 8 folded dipoles on my 100ft tower.
I can not find any information whatsoever on these. I have 4 consecutive serial numbered boxes.
Bluewave Marathon
BME139FN1H0
138 - ...
