Double resonance antenna and antenna for portable radio
First Claim
Patent Images
1. A multiple resonance antenna comprising:
- an insulating antenna bobbin which has the pattern of an element that resonates in a plurality of frequency bands, formed on the outer circumferential surface; and
a conductive parasitic conductor which is inserted into an accommodating hole formed substantially along the central axis of the antenna bobbin.
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Abstract
With the object of forming a compact antenna that operates in a plurality of frequency bands, the pattern of an antenna element 14 that can resonate in a plurality of frequency bands is formed on the outer circumferential surface of an antenna bobbin 12. A parasitic conductor 11 is inserted into an accommodating hole which is formed substantially along the central axis of this antenna bobbin 12. As a result, an antenna that operates favorably in the frequency bands of AMPS, PCS and GPS can be obtained.
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Citations
8 Claims
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1. A multiple resonance antenna comprising:
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an insulating antenna bobbin which has the pattern of an element that resonates in a plurality of frequency bands, formed on the outer circumferential surface; and
a conductive parasitic conductor which is inserted into an accommodating hole formed substantially along the central axis of the antenna bobbin. - View Dependent Claims (2, 3)
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4. A mobile phone antenna comprising:
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a fixed antenna part which can be fastened to the housing of a mobile phone; and
a retractable antenna part which passes through the fixed antenna part, and is retractable with respect to the fixed antenna part;
wherein the fixed antenna part is constructed from an insulating antenna bobbin which has the pattern of an element that resonates in a plurality of frequency bands, formed on the outer circumferential surface, a conductive parasitic conductor which is inserted into a through-hole formed substantially along the central axis of the antenna bobbin, a conductive antenna holder with which the lower part of the antenna bobbin is engaged, and to which the element is electrically connected, and an insulating cap part which covers the antenna bobbin, and the retractable antenna part is constructed from a whip part, a conductive stopper which is disposed on the lower end of the whip part and which is held inside an antenna through-hole formed substantially along the central axis of the fixed antenna part when the retractable antenna part is extended, and an insulative insulating part which is disposed on the tip end of the whip part, and which is positioned inside the antenna through-hole when the retractable antenna part is retracted. - View Dependent Claims (5, 6, 7, 8)
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Specification