Helical type antenna and manufacturing method thereof
First Claim
1. A helical type antenna comprising a plurality of radiating cords, said cords being wound onto a sleeve in a rotational shape, wherein said antenna has a single transmission line to supply all the radiating cords present on the sleeve, said transmission line consisting of a strip line above a ground plane, said strip line and ground plane being located on said sleeve and said transmission line performing both the power distribution function and the function of impedance matching the radiating cords of the antenna.
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Accused Products
Abstract
A helical type of antenna has at least one radiating cord, helically wound in a rotational shape. The antenna has a circuit for the supply of the radiating cords formed by a strip line type of transmission line which fulfills both the supply distribution function and the function of matching the radiating cords of the antenna.
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Citations
13 Claims
- 1. A helical type antenna comprising a plurality of radiating cords, said cords being wound onto a sleeve in a rotational shape, wherein said antenna has a single transmission line to supply all the radiating cords present on the sleeve, said transmission line consisting of a strip line above a ground plane, said strip line and ground plane being located on said sleeve and said transmission line performing both the power distribution function and the function of impedance matching the radiating cords of the antenna.
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7. A method of forming a helical type antenna comprising a sleeve on which are disposed a plurality of spaced apart radiating cords wound thereabout, the ends of said cords adjacent to one end of said sleeve being interconnected by a band of metal, and a strip line to which the other ends of said cords are connected being disposed on said sleeve adjacent to the other end thereof, said method comprising:
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a) providing a flexible sheet of a dielectric material with a layer of metal on opposite sides thereof; b) demarcating, on said sheet, a first zone designed to contain said strip line and a second zone designed to contain said radiating cords and said metal band; c) removing the metal layer from said second zone on one side of said sheet; d) patterning the metal layer on the other side of said sheet into, within said second zone, said radiating cords and said metal band, and, within said first zone, said strip line; and e) forming said sheet into the shape of said sleeve. - View Dependent Claims (8, 9, 10, 11)
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- 12. A helical type antenna comprising a plurality of radiating cords, said cords being wound onto a sleeve in a rotational shape wherein each radiating cord is formed by a metallized zone in the form of a strip helically wound along a surface of said sleeve, said strips being interleaved along said sleeve and each said strip being distant from the adjacent strip, along a directix of said sleeve, by a predetermined distance, said antenna further comprising a single transmission line to supply all the radiating cords present on the sleeve, said transmission line consisting of a strip line above a ground plane, said strip line and ground plane being located on said sleeve and formed by a meandering line performing both the power distribution function and the function of impedance matching the radiating cords of the antenna.
Specification