Antenna for a portable radio telephone
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United States of America Patent
Stats
-
Jun 30, 1998
Grant Date -
N/A
app pub date -
Apr 12, 1995
filing date -
Apr 12, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna for radio communications such as portable telephone systems including a rod-form antenna element installed in the case of a radio communication set so that the antenna element can be retracted and pulled out with one portion of the antenna element remains outside of the case when the antenna element is accommodated inside the case; an impedance matching device connected to the feeding point of the antenna element and to the radio communication set; a stub which is a grounded conductive member and is installed so as to surround the outer circumference of the antenna element without touching the antenna element when the antenna element is accommodated inside the case. The base end of the antenna element and the base end of the stub are electrically coupled when the antenna element is completely accommodated inside the case so that good impedance matching can be obtained even when the antenna element is accommodated inside the case and that incoming calls are received without any failure.
First Claim
Family
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Cited Art Landscape
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