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Displaced Element Dipole and feed question
On Saturday, February 21, 2015 at 10:35:53 AM UTC-6, John S wrote:
Suppose I have a dipole where the two quarter-wave elements are not exactly aligned. That is, the axis of, say, the left element is displaced by some amount from the axis of the right element. Then, what about feeding them from a balanced line? The questions a * How will the antenna impedance and current distribution suffer, if at all? * What feed system is required? 90 degrees to the axis is preferable, but that means that the twin lead has one side longer than the other. Is this interesting? Or, has it been discussed before? What was the outcome, if any? Thanks, Guys. I wouldn't feed with one wire of the ladder line longer than the other. I'd split it at the end long enough to feed both elements from the middle of the two elements. I don't know how far apart you are talking about, so couldn't say about how it would work. You could model it and get a fairly decent idea I would think. If they are not that far apart, I don't think it would act much different than any other dipole. Particularly if you use the spread apart wires of the ladder line to feed, as those portions of the ladder line will act like part of the dipole elements. |
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