Folded antenna
First Claim
1. A folded antenna, comprising:
- a first element, comprising a conductor which is provided in a direction from a base of the antenna toward a tip side thereof, said conductor being folded at least once at said tip side and at least once at a base side and arranged parallel to said direction;
a second element, said second element comprising said conductor which is split at a location consisting of one of1) a point between said base and a first fold point at said tip side; and
2) said first fold point,said second element being folded at least once and arranged parallel to said direction;
the effective length from said base to a tip of said first element being set so that a first frequency resonates, and the effective length from said base to a tip of said second element being set so that a second frequency resonates.
1 Assignment
0 Petitions
Accused Products
Abstract
A conductor is provided from a base to a first fold point at the tip side, and sequentially folded parallel not less than once at the tip side and the base side, forming a first element; the conductor is split at the first fold point and the split conductor is, similarly, sequentially folded parallel not less than once at the tip side and the base side, forming a second element. Then, the effective length from the base to the tip of the first element is set to a quarter of the wavelength of a first frequency, and the effective length from the base to the tip of the second element is set to a quarter of the wavelength of a second frequency. Also provided is a folded antenna element, comprising a conductor in a direction from the base to the tip side, the conductor being folded at least once at the tip side and arranged parallel to the direction, is made cylindrical; a rod-like antenna element is provided so as to be freely movable in the axial direction of the folded antenna element; and, in an extended state, the base side of the rod-like antenna element becomes inserted to the tip side of the folded antenna element and is capacitance-coupled thereto by a large coupling capacitance. The effective length of the folded antenna element from the base to the tip is a quarter of the wavelength of the first frequency, and three quarters of the wavelength of the second frequency. In the extended state, the effective length from the base of the folded antenna element to the tip of the rod-like antenna element is a quarter of the wavelength of the first frequency, and three quarters of the wavelength of the second frequency.
88 Citations
26 Claims
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1. A folded antenna, comprising:
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a first element, comprising a conductor which is provided in a direction from a base of the antenna toward a tip side thereof, said conductor being folded at least once at said tip side and at least once at a base side and arranged parallel to said direction; a second element, said second element comprising said conductor which is split at a location consisting of one of 1) a point between said base and a first fold point at said tip side; and 2) said first fold point, said second element being folded at least once and arranged parallel to said direction; the effective length from said base to a tip of said first element being set so that a first frequency resonates, and the effective length from said base to a tip of said second element being set so that a second frequency resonates. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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4. A folded antenna, comprising:
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a first element, comprising a conductor which is provided in a direction from a base of the antenna toward a tip side thereof, said conductor being folded sequentially not less than once at said tip side and at a base side and arranged parallel to said direction; a second element, said second element comprising said conductor which is split at a location consisting of one of 1) a point between said base and a first fold point at said tip side; and 2) said first fold point, said second element being folded sequentially not less than once at said tip side and said base side and arranged parallel to said direction; the effective length from said base to a tip of said first element being set so that a first frequency resonates, and the effective length from said base to a tip of said second element being set so that a second frequency resonates. - View Dependent Claims (18, 19)
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20. A freely extendable and storable antenna, comprising:
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a folded antenna element, comprising a first element, which comprises a conductor provided in a direction from a base toward a tip side, said conductor being folded at least once at said tip side and arranged parallel to said direction, and a second element, said second element comprising said conductor split at a location consisting of one of 1) a point between said base and a first fold point at said tip side; and 2) said first fold point, said second element being folded at least once and arranged parallel to said direction, the effective length of said folded antenna element from said base to a tip of said first element being set to a quarter of a wavelength of a first frequency, and the effective length from said base to a tip of said second element being set to a quarter of a wavelength of a second frequency; and a rod-like antenna element, provided so as to be freely movable along an axis direction of said folded antenna element, which is given a cylindrical shape;
whereinwhen said rod-like antenna element is in an extended state, a base side of said rod-like antenna element is capacitance-coupled to a tip side of said cylindrical folded antenna element in a state of insertion therein, the effective length from a base of said folded antenna element to a tip of said rod-like antenna element being set to a quarter of a wavelength of said first frequency and three quarters of a wavelength of said second frequency. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification