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Roy Lewallen wrote: Jim Kelley wrote: One point: Isn't the input impedance of a dipole normally specified at a wavelength equal to twice the electrical length of the antenna? As far as I know, dipoles have infinite DC resistance at zero Hertz. ;-) As frequency approaches zero, a dipole's input resistance approaches zero and its reactance approaches minus inifnity. That is, it looks like a capacitor, and the capacitive reactance gets larger as the frequency gets lower. Which is just what you'd expect from a couple of electrically very short wires having no DC connection. Roy Lewallen, W7EL I'll give you a Mulligan on that one if you like, Roy. ;-) 73, ac6xg |
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