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What do ground radials do?
Grounding radials The radials at the antenna base provide a proper ground plane for the types of radio antennas used for long wavelengths. These electrically “short” antennas require grounding or earthing wires to function well. The radials are typically buried in the soil or laid on the soil in a flat, radial pattern.
Do ground radials need to be straight?
You don’t have to run the radials in straight lines. In fact, you don’t even have to run them underground. But you do need to install as many radials as possible for each band on which the antenna operates. In fact, a vertical dipole can work quite well.
When does the size of a ground plane not matter?
My understanding is that when building or installing an antenna designed to operate over a ground plane (e.g. a quarter-wave vertical), the size of the ground plane does not matter (e.g. the earth, possibly coupled using additional radial wires, or a car roof of unspecified size), provided that it is sufficiently large compared to the wavelength.
When does the size of a ground plane antenna matter?
On the continuum of antenna designs between a ground plane antenna and a coaxial vertical dipole, why is it that sometimes there is a well-defined optimum size of the ground plane, or rather the antenna element which is not pointing upward, whereas sometimes it doesn’t seem to matter much?
How many radials do you need for a vertical antenna?
Often four conducting radials are used and these often provide a sufficient simulation of the complete circular ground plane. Vertical antenna with ground plane radials. It is not always necessary to have a minimum of four radials – often even two will suffice.
Does the ground plane have to be a continuous surface?
The ground plane doesn’t have to be a continuous surface. In the ground plane antenna style whip antenna, the “plane” consists of several wires λ /4 long radiating from the base of a quarter-wave whip antenna.