Antenna and communication system using the same
First Claim
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1. An antenna comprising:
- a first core made of first magnetic material;
a coil including a conductive wire having a portion wound around a predetermined region of the first core; and
a second core made of second magnetic material, the second core being operable to move within an area between the portion of the conductive wire and the first core.
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Abstract
An antenna includes a first core made of magnetic material, a coil including a conductive wire wound around a predetermined region of the first core, and a second core made of magnetic material. The second core is operable to move an inside of the coil. The antenna has a resonant frequency adjustable over a wide rage.
24 Citations
30 Claims
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1. An antenna comprising:
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a first core made of first magnetic material; a coil including a conductive wire having a portion wound around a predetermined region of the first core; and a second core made of second magnetic material, the second core being operable to move within an area between the portion of the conductive wire and the first core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communication system comprising:
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a first communication device; an antenna connected to the first communication device, the antenna including a first core made of first magnetic material, a coil having a portion wound around a predetermined area of the first core, and a second core made of second magnetic material, the second core being operable to move within an area between the portion of the coil and the first core; and a second communication device operable to communicate with the first communication device via the antenna.
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12. An antenna comprising:
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a first core made of first magnetic material; a coil including a conductive wire wound around a predetermined region of the first core; and a second core made of second magnetic material, the second core being operable to move inside of the coil, wherein the first core has a recess provided therein, and wherein the second core is operable to move in the recess of the first core. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A communication system comprising:
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a first communication device; an antenna connected to the first communication device, the antenna including a first core made of first magnetic material, a coil including a conductive wire wound around a predetermined region of the first core, and a second core made of second magnetic material, the second core being operable to move inside of the coil, wherein the first core has a recess provided therein, and wherein the second core is operable to move in the recess of the first core; and a second communication device operable to communicate with the first communication device via the antenna.
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22. An antenna comprising:
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a first core made of first magnetic material; a coil including a conductive wire wound around a predetermined region of the first core; and a second core made of second magnetic material, the second core being operable to move inside of the coil, wherein the coil has a first region and a second region where the conductive wire is wound at a density larger than a density of the conductive wire at the first region. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A communication system comprising:
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a first communication device; an antenna connected to the first communication device, the antenna including a first core made of first magnetic material, a coil including a conductive wire wound around a predetermined region of the first core, and a second core made of second magnetic material, the second core being operable to move inside of the coil, wherein the coil has a first region and a second region where the conductive wire is wound at a density larger than a density of the conductive wire at the first region; and a second communication device operable to communicate with the first communication device via the antenna.
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsArakawa, Toru, Ohara, Masahiro, Kamaeguchi, Shinji
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Primary Examiner(s)PHAN, THO GIA
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Application NumberUS10/823,633Publication NumberTime in Patent Office720 DaysField of Search343/713, 343/787, 343/788US Class Current343/788CPC Class CodesH01Q 1/3241 particular used in keyless ...H01Q 7/08 Ferrite rod or like elongat...
