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US 5,969,683 AGranted
Radiotelephones with antenna matching switching system configurations
AssigneeEricsson Inc.
InventorsGerard J. Hayes, Howard E. Holshouser
Life of this patent
Estimating the term…
Abstract
A radiotelephone matching switching system and associated antenna and printed circuit board contact configurations for a retractable antenna employs at least two contacts which are traversely spaced apart in the radiotelephone housing so as to reduce the space used therein. One embodiment also allows reactive components of the circuit to be disconnected thereby increasing the operational bandwidth of the radiotelephone.
Claims30
A radiotelephone, comprising:
- a retractable antenna having opposing first and second ends with respective first and second externally accessible conductive portions and defining a central axis through the center thereof, said antenna slidably extendable about said central axis between a first extended position and a second retracted position, wherein said antenna has a first impedance in said first position and a second impedance less than the first impedance in said second position;
- a radiotelephone housing configured to receive said retractable antenna therein;
- a radiotelephone printed circuit board disposed in said housing adjacent said antenna, said printed circuit board including first and second transversely spaced-apart antenna circuit contacts;
- and
- a matching circuit operably associated with at least one of said antenna circuit contacts, wherein when said antenna is extended said matching circuit is activated upon contact between said antenna and one or the other single one of said first and second transversely spaced-apart antenna circuit contacts thereby matching the increased impedance attributed thereto.
2 more elements
A radiotelephone, comprising:
- a retractable antenna having opposing first and second ends and defining a central axis through the center thereof, said antenna slidably extendable about said central axis between a first extended position and a second retracted position, wherein said antenna has a first impedance in said first position and a second impedance less than the first impedance in said second position;
- a radiotelephone housing configured to receive said retractable antenna therein;
- a radiotelephone printed circuit board disposed in said housing adjacent said antenna, said printed circuit board including first and second transversely spaced-apart antenna circuit contacts;
- and
- a matching circuit operably associated with at least one of said first and second antenna circuit contacts. wherein when said antenna is extended said matching circuit is activated to match the increased impedance attributed thereto;
- wherein each of said first and second transversely spaced-apart antenna circuit contacts are positioned on different sides of said central axis, and wherein said matching circuit is activated by contact with a selected one of said first and second transversely spaced-apart antenna circuit contacts;
- wherein said first and second transversely spaced-apart antenna circuit contacts are positioned on said printed circuit board such that each is substantially co-planar with the other along the plane of contact with said antenna;
- and
- wherein said first and second transversely spaced-apart antenna circuit contacts extend a predetermined distance toward the central axis, and wherein one of said first and second transversely spaced-apart antenna circuit contacts extends toward the central axis a greater distance than the other.
6 more elements
A radiotelephone, comprising:
- a retractable antenna having opposing first and second ends and defining a central axis through the center thereof, said antenna including an offset conducting circuit contact portion on said second end, said antenna slidably extendable about said central axis between a first extended position and a second retracted position, wherein said antenna has a first impedance in said first position and a second impedance less than said first impedance in said second position;
- a radiotelephone housing configured to receive said retractable antenna therein, wherein said antenna first end is extendable out of said housing and said second end is non-extendable out of said housing;
- a radiotelephone printed circuit board disposed in said housing adjacent said antenna, said printed circuit board including first and second transversely spaced-apart antenna circuit contacts, each positioned on different sides of said central axis;
- a matching circuit including an inductor operably associated with each of said antenna circuit contacts, wherein when said antenna is extended said matching circuit is electrically activated by contact with said antenna offset portion to match the increased impedance attributed thereto;
- and
- wherein when said antenna is retracted said inductor is short-circuited from said matching circuit.
3 more elements
a radiotelephone, comprising:
- a retractable antenna having opposing first and second ends and defining a central axis through the center thereof, said antenna comprising an antenna element, and first, second, and third conductive contact portions, wherein said second conductive contact portion electrically floats relative to said antenna element and said first and third conductive portions, said antenna slidably extendable about said central axis between a first extended position and a second retracted position, wherein said antenna has a first impedance in said first position and a second impedance less than said first impedance in said second position;
- a radiotelephone housing configured to receive said retractable antenna therein;
- a radiotelephone printed circuit board disposed in said housing adjacent said antenna, said printed circuit board including first, second, and third antenna circuit contacts, wherein said first and second contacts are transversely spaced-apart, and said third contact is electrically connected with and positioned longitudinally spaced-apart from said second contact;
- and
- a matching circuit operably associated with each of said antenna circuit contacts, wherein when said antenna is extended said matching circuit is activated to match the increased impedance attributed thereto.
2 more elements
A radiotelephone, comprising:
- a retractable antenna having opposing first and second ends and defining a central axis through the center thereof, said antenna slidably extendable about said central axis between a first extended position and a second retracted position, wherein said antenna has a first impedance in said first position and a second impedance less than the first impedance in said second position;
- a radiotelephone housing configured to receive said retractable antenna therein;
- a radiotelephone printed circuit board disposed in said housing adjacent said antenna, said printed circuit board including first and second transversely spaced-apart antenna circuit contacts;
- and
- a matching circuit operably associated with at least one of said antenna circuit contacts, wherein when said antenna is extended said matching circuit is activated to match the increased impedance attributed thereto;
- wherein each of said first and second transversely spaced-apart antenna circuit contacts are positioned on circumferentially spaced apart relative to the central axis, and wherein said matching circuit is activated by contact with at least one of said first and second transversely spaced-apart antenna circuit contacts, and wherein said first and second transversely spaced-apart antenna circuit contacts are configured with laterally extending arms oriented to face toward the central axis, and wherein one of said first and second laterally extending arms is closer to the central axis than the other.
3 more elements
Dependencies are inferred from the claim text.