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#12
April 2nd 14, 07:55 PM
posted to rec.radio.amateur.antenna
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Radials
Ian Jackson wrote:
In message , writes The ideal radial length for ANY ground plane antenna is slightly longer than 1/4 wavelength, no matter for what frequencey. Why is this? I would have thought that a 1/4 wave would be best, as it offers the lowest impedance. First you have to define what "best" means. All antennas are a trade off for impedance, bandwidth, gain and in most cases physical ability to build the structure. Changing the radial length will have a small effect on impdedance and resonant point but changing the radial angle will have a bigger effect on impedance and a very small effect on resonant point. I would suggest downloading the demo version of EZNEC and modeling a GP to see what small changes in various parameters do. -- Jim Pennino |
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