Antenna device for mobile tele-communication terminal
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 18, 2003
Grant Date -
Sep 12, 2002
app pub date -
Dec 28, 2001
filing date -
Dec 28, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A whip antenna is movable between a first position corresponding to a state in which the whip antenna is extended from a casing of the mobile communication terminal, and a second position corresponding to a state the whip antenna is accommodated within the casing. A built-in antenna is disposed within the casing. A power feeding circuit is disposed within the casing. A first matching circuit has a first impedance, through which the power feeding circuit and the whip antenna are electrically connected when the whip antenna is placed at the first position. A second matching circuit has a second impedance which is higher than the first impedance, through which the whip antenna is grounded when the whip antenna is placed at the second position. A switch mechanism is opened so that the built-in antenna is electrically disconnected from the power feeding circuit when the whip antenna is placed at the first position, and closed so that the built-in antenna is electrically connected to the power feeding circuit.
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Family
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Cited Art Landscape
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