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US 6,191,755 B1Granted
Two-resonance helical antenna capable of suppressing fluctuation in electrical characteristic without restriction in size of a helical coil
AssigneeTokin Corporation
InventorIwao Hamaaratsu
Life of this patent
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Abstract
In a two-resonance helical antenna, a single helical coil (3) is made of a conductive material and extends in one axis direction. An annular conductor portion (5) is arranged around the helical coil in a coaxial fashion to be spaced and insulated from the helical coil. The annular conductor portion is positioned in a middle portion of the helical coil in the one axis direction.
Claims4
A two-resonance helical antenna comprising:
- a single helical coil made of a conductive material and extending in an axial direction of the antenna;
- and
- an annular conductor portion arranged around said single helical coil in a coaxial fashion to be spaced and insulated from said single helical coil,
- wherein said annular conductor portion is arranged around said single helical coil at a middle portion of said single helical coil between first and second ends of said single helical coil in said axial direction of the antenna.
1 more element
Dependencies are inferred from the claim text.