Helical antenna
First Claim
1. A helical antenna comprising a cylindrical dielectric member, m members of a first helical conductor which are wound around an outer wall of said cylindrical dielectric member, m representing a natural number, said m members of the first helical conductor covering a first frequency band, n members of a second helical conductor which are attached to an inner wall of said cylindrical dielectric member, n representing a natural number, said n members of the second helical conductor covering a second frequency band, a first power supply circuit for supplying high-frequency powers to said members of the first helical conductor on the outer wall of said cylindrical dielectric member, and a second power supply circuit for supplying high-frequency powers to said members of the second helical conductor on the inner wall of said cylindrical dielectric member,wherein an angle of each of said m members of the first helical conductor relative to a horizontal direction is different from an angle of each of said n members of the second helical conductor relative to the horizontal direction, andwherein a length of each of said m members of the first helical conductor is different from a length of each of said n members of the second helical conductor,whereby a beam radiation direction of said first frequency band is the same as a beam radiation direction of said second frequency band.
1 Assignment
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Accused Products
Abstract
A helical antenna comprising a cylindrical dielectric member 1, four spiral conductors 2a to 2d which are wound around the outer wall of the cylindrical dielectric member 1, four spiral conductors 3a to 3d which are attached to the inner wall of the cylindrical dielectric member 1, and power supply circuits 4, 5 for supplying high-frequency power to the spiral conductors 2a to 2d and the spiral conductors 3a to 3d respectively. That is, the spiral conductors serving as radiation elements are disposed at the outside and inside of the cylindrical dielectric member, and the outer and inner conductors are operated as independent helical antennas. These spiral conductors are connected to the power supply circuits for supplying the high-frequency power having desired amplitude and phase.
29 Citations
14 Claims
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1. A helical antenna comprising a cylindrical dielectric member, m members of a first helical conductor which are wound around an outer wall of said cylindrical dielectric member, m representing a natural number, said m members of the first helical conductor covering a first frequency band, n members of a second helical conductor which are attached to an inner wall of said cylindrical dielectric member, n representing a natural number, said n members of the second helical conductor covering a second frequency band, a first power supply circuit for supplying high-frequency powers to said members of the first helical conductor on the outer wall of said cylindrical dielectric member, and a second power supply circuit for supplying high-frequency powers to said members of the second helical conductor on the inner wall of said cylindrical dielectric member,
wherein an angle of each of said m members of the first helical conductor relative to a horizontal direction is different from an angle of each of said n members of the second helical conductor relative to the horizontal direction, and wherein a length of each of said m members of the first helical conductor is different from a length of each of said n members of the second helical conductor, whereby a beam radiation direction of said first frequency band is the same as a beam radiation direction of said second frequency band.
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8. A helical antenna comprising a cylindrical member, m members of a first helical conductor wound around an outer wall of said cylindrical member, m representing a natural number, said m members of the first helical conductor covering a first frequency band, n members of a second helical conductor attached to an inner wall of said cylindrical member, n representing a natural number, said n members of the second helical conductor covering a second frequency band, power supply means for supplying high-frequency powers to said members of the first helical conductor and for supplying high-frequency powers to said members of the second helical conductor,
wherein an angle of each of said m members of the first helical conductor relative to a horizontal direction is different from an angle of each of said n members of the second helical conductor relative to the horizontal direction, wherein a length of each of said m members of the first helical conductor is different from a length of each of said n members of the second helical conductor, and a beam radiation direction of said first frequency band is the same as a beam radiation direction of said second frequency band.
Specification