Antenna device and portable radio set
First Claim
Patent Images
1. An antenna device comprising:
- a first antenna element provided so as to be freely retracted or extended;
a second antenna element;
an unbalanced transmission line for supplying power to the first and second antenna elements;
balanced-to-unbalanced transform means for performing balanced-to-unbalanced transform between the unbalanced transmission line and the first and second antenna elements; and
connection means for electrically connecting the first and second antenna elements to the balanced-to-unbalanced transform means when the first antenna element is retracted and electrically connecting at least the first antenna element to the balanced-to-unbalanced transform means when the first antenna element is extended, wherein the first and second antenna elements are operated as antennas by supplying power to the first and second antenna elements from the unbalanced transmission line through the balanced-to-unbalanced transform means when the first antenna element is retracted; and
the first antenna element is operated as an antenna by supplying power to at least the first antenna element from the unbalanced transmission line through the balanced-to-unbalanced transform means when the first antenna element is extended.
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Abstract
The present invention makes it possible to realize an antenna device and a portable radio set capable of greatly reducing the deterioration of antenna characteristics while used near a human body and greatly reducing the deterioration of communication quality by electrically connecting first and second antenna elements to a balanced-to-unbalanced transform circuit by connection means when a first antenna element is retracted, supplying power to the first and second antenna elements from an unbalanced transmission line through balanced-to-unbalanced transform means to operate the first and second antenna elements as antennas, preventing a leakage current from flowing to a ground member to which the unbalanced transmission line is grounded from the first and second antenna elements through the transmission in accordance with the balanced-to-unbalancecd transform by the balanced-to-unbalanced transform means, and thereby preventing the ground member from operating as an antenna.
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Citations
12 Claims
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1. An antenna device comprising:
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a first antenna element provided so as to be freely retracted or extended;
a second antenna element;
an unbalanced transmission line for supplying power to the first and second antenna elements;
balanced-to-unbalanced transform means for performing balanced-to-unbalanced transform between the unbalanced transmission line and the first and second antenna elements; and
connection means for electrically connecting the first and second antenna elements to the balanced-to-unbalanced transform means when the first antenna element is retracted and electrically connecting at least the first antenna element to the balanced-to-unbalanced transform means when the first antenna element is extended, wherein the first and second antenna elements are operated as antennas by supplying power to the first and second antenna elements from the unbalanced transmission line through the balanced-to-unbalanced transform means when the first antenna element is retracted; and
the first antenna element is operated as an antenna by supplying power to at least the first antenna element from the unbalanced transmission line through the balanced-to-unbalanced transform means when the first antenna element is extended. - View Dependent Claims (2, 3, 4, 5, 6)
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured as a helical antenna mechanically connected to the rod antenna.
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3. The antenna device according to claim 2, wherein
the rod antenna is formed as a collapsible antenna by inserting a conductive rod member into a conductive hollow cylinder and the rod antenna is collapsed when the rod antenna is retracted. -
4. The antenna device according to claim 1, wherein
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured as a helically-formed fixed helical antenna and positioned so that the rod antenna is retracted and extended along the helical axis of the helical antenna.
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5. The antenna device according to claim 1, wherein
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured as a helically-formed fixed helical antenna and positioned so that the helical axis of the helical antenna is almost parallel to the longitudinal direction of the rod antenna.
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6. The antenna device according to claim 1, wherein
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured as a helically-formed fixed helical antenna, having one or both ends electrically connected to the rod antenna to form a composite antenna when the first antenna element is extended.
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7. A portable radio set having an antenna device, the antenna device comprising:
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a first antenna element provided so as to be freely retracted and extended;
a second antenna element;
an unbalanced transmission line for supplying power to the first and second antenna elements;
balanced-to-unbalanced transform means for performing balanced-to-unbalanced transform between the unbalanced transmission line and the first and second antenna elements; and
connection means for electrically connecting the first and second antenna elements to the balanced-to-unbalanced transform means when the first antenna element is retracted and electrically connecting at least the first antenna element tot he balanced-to-unbalanced transform means when the first antenna element is extended, wherein the first and second antenna elements are operated as antennas by supplying power to the first and second antenna elements from the unbalanced transmission line through he balanced-to-unbalanced transform means when the first antenna element is retracted; and
the first antenna element is operated as an antenna by supplying power to at least the first antenna element from the unbalanced transmission line through the balanced-to-unbalanced transform means when the first antenna element is extended. - View Dependent Claims (8, 9, 10, 11, 12)
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured as a helical antenna mechanically connected to the rod antenna.
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9. The por table radio set according to claim 8, wherein
the rod antenna is formed as a collapsible an tenna by inserting a conductive rod member into a conductive hollow cylinder and the rod antenna is collapsed when the rod antenna is retracted. -
10. The portable radio set according to claim 7, wherein
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured ed as a helically-formed fixed helical antenna and positioned so that the rod antenna is retracted and extended along the helical axis of the helical antenna.
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11. The portable radio set according to claim 7, wherein
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured as a helically-formed fixed helical antenna, and positioned so that the helical axis of the helical antenna is almost parallel to the longitudinal direction of the rod antenna.
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12. The portable radio set according to claim 7, wherein
the first antenna element is configured as a rod antenna; - and
the second antenna element is configured as a helically-formed fixed helical antenna, having one or both ends electrically connected to the rod antenna to form a composite antenna when the first antenna element is extended.
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Specification
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Current AssigneeSony Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsIto, Hiroki, Sawamura, Masatoshi
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Primary Examiner(s)LE, HOANGANH T
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Application NumberUS09/633,662Time in Patent Office603 DaysField of SearchH01/Q.124, H01/Q.136, 343/702, 343/895, 343/725, 343/729, 343/850, 343/853, 343/852, 343/859, 343/860, 343/865US Class Current343/702CPC Class CodesH01Q 1/244 extendable from a housing a...H01Q 1/362 for broadside radiating hel...H01Q 21/28 Combinations of substantial...H01Q 9/30 with feed to end of elongat...H04B 7/04 using two or more spaced in...
