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#13
April 23rd 05, 05:26 PM
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What would this achieve??
"Richard Harrison" wrote in message ... Gavin wrote: "I know normal dipole antenna radiate outwards from their ends, but I`m bot sure about the folded version." The propagation pattern from a dipole forms a toroid centered on the middle of the dipole wire. Radiatiation is perpendicular too the center of the wire. There are nulls at the ends of the wire. Adding a wire or wires between enda of the simple dipole does nothong to change its radiation resistance, antenna efficiency, directional pattern, or directive gain. Drivepoint impedance increases with added wires as total antenna current is divided among them. If two equal wires are used in the folded dipole, its drivepoint impedance is four times the impedance of the single wire dipole. If there are three wires, the impedance is multiplied by nine. Impedance varies by the square of the number of same sized wires in the folded dipole. Best regards, Richard Harrison, KB5WZI |
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