Folded Dipole 40M
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| Aug 1st 2013, 22:04 | |
xof7foxTotal Topics: 0 Total Posts: 0 |
This antenna design typically has a 300 ohm impedance. Given that a "Single Wire Dipole" has about a 72 ohm impedance, is there some advantage to working with the higher 300 ohm impedance, e.g., greater gain? I think I have read that there is generally a 'flatter' VSWR curve with a "Folded Dipole" in comparision with the "Single Wire Dipole.' Thanks - Fred K4XXK |
| Aug 2nd 2013, 03:38 | |
aa6eTotal Topics: 0 Total Posts: 0 |
The higher impedance of a folded dipole doesn't appreciably change the gain or pattern of the antenna. The FD does have a broader resonance, which is a plus. The choice of single wire, double (folded), or even more wires is mostly a matter of what kind of feed line you want to use and how much mechanical complexity you can deal with. (3 wires will give ~ 600 ohms feed-point impedance and even broader response). You can also look into "cage dipoles" which are not folded but offer wider response. 73 Martin AA6E |
| Sep 17th 2013, 23:01 | |
xof7foxTotal Topics: 0 Total Posts: 0 |
Thank you Martin. Fred. |
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