Telescopic antenna for portable telephones
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 13, 1996
Grant Date -
N/A
app pub date -
Jul 26, 1994
filing date -
Jul 26, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna mount 31 consisting of a hollow bulging member is formed so as protrude locally from the top of a portable telephone housing 30. A first antenna 10 with an electrical length of .lambda./4 is provided inside the antenna mount so that the base end Q of the first antenna is connected to a feeder cable 15. A second antenna 20 with an electrical length of 3 .lambda./4 is installed parallel to the first antenna 10 at a prescribed distance from the first antenna so that the second antenna can be freely extended from and retracted into the housing 30 via the antenna mount 31 and so that the base end 23 of the second antenna 20 is connected to the earthing means 32 of the housing 30 when the second antenna is extended from the housing 30, thus providing a J-form antenna formed by the first and second antennas 10 and 20. It is desirable that the first and second antennas 10 and 20 each be equipped with an element-shortening means.
First Claim
Family
International Classification(s)
Cited Art Landscape
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