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US 6,188,918 B1Granted
Removably mounted retractable 1/2 wave antenna with integral matching section
AssigneeCenturion International, Inc.
InventorMark G. Cockson
Life of this patent
Estimating the term…
Abstract
A retractable ½ wave antenna having an integral matching section that can be used on a cellular telephone will be matched to a transceiver circuit when extended. When the antenna is retracted, it acts as a ¼ wave antenna and will still be matched to the transceiver circuit.
Claims19
A radio transceiver having a retractable antenna comprising:
- a housing;
- a transceiver circuit, said transceiver circuit disposed within said housing;
- a transmission line electrically coupled to said transceiver circuit, said transmission line having a hollow center conductor and an outer conductor;
- an antenna mount, said mount coupled to said housing, said mount forming a low impedance connector electrically coupled to said transmission line;
- and
- a retractable antenna element removably coupled to said mount, said antenna having a retracted position and an extended position, said antenna being at least partially disposed within said center conductor when said antenna is in the retracted position, said antenna having an upper portion and a lower portion, said lower portion having a contact, said contact making electrical contact with said center conductor when said antenna is in the extended position, said antenna including an impedance matching circuit disposed substantially within said center conductor when said antenna is in the extended and retracted positions to form a parallel resonant circuit.
3 more elements
A radio transceiver comprising:
- a housing;
- a transceiver circuit, said transceiver circuit disposed within said housing;
- a low impedance transmission line electrically coupled to said circuit, said transmission line having a first end and a second end, said transmission line having a generally hollow center conductor and a generally cylindrical outer conductor;
- and
- a low impedance connector for receiving an external fixture, said connector electrically coupled to said transmission line, said connector coupled to said housing;
- a retractable antenna removably coupled to said low impedance connector, said retractable antenna being slidably received within said center conductor, said retractable antenna being slidably movable from a retracted position to an extended position;
- and
- an impedance matching circuit disposed within said center conductor when said antenna is in the retracted and extended positions to form a parallel resonant circuit.
5 more elements
The radio transceiver of claim of 8 wherein said impedance matching circuit includes an inductor.
A radio transceiver comprising:
- a housing;
- a transceiver circuit, said transceiver circuit disposed within said housing;
- a low impedance transmission line electrically coupled to said circuit, said transmission line having a first end and a second end, said transmission line having a generally hollow center conductor and a generally cylindrical outer conductor;
- a low impedance connector for receiving an external fixture, said connector electrically coupled to said transmission line, said connector coupled to said housing;
- and
- a fixed length antenna coupled to said low impedance connector.
3 more elements
Dependencies are inferred from the claim text.