[Antennas] Lenght of W3EDP
Harvey&Bessie
[email protected]
2002年5月17日 20:14:48 -0400
The longer you make the wire (beyond several wavelengths) the more
directional it becomes -- bi-directional off the ends. If you terminate
the far end with a non-inductive resistor of about 350 ohms (to ground)
the L/W becomes uni-directional off the far end. At three wavelengths
long the major lobe will form an angle with the wire at 30� either side,
at six wavelengths the angle of the main lobe will be 20� . Antennas
shorter than 2 wavelengths are not properly called "long wires," the
term for the shorter wire is "random" wire.
Harvey/W4TG