What is a spiral antenna

Helical antenna is a spiral-shaped antenna. It is a good electrical conductivity properties of the metal spiral, usually feed line, heart line and the line of the spiral connected at one end, the line outside the conductor is grounded and the network of metal (or plate) connected. Spiral antenna radiation and the direction of the spiral circle about long. When the spiral circle of a wavelength longer than a lot of small, the strongest radiation in the direction perpendicular to the screw shaft; when the spiral circle for a long wavelength of the order of magnitude, the strongest radiation in the spiral spin axis direction.

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