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