Telescopic antenna for portable telephones

Details Telescopic antenna for portable telephones Telescopic antenna for portable telephones

1994-07-26

1996-08-13

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With radio cabinet

343900, 343828, H01Q 124

Patent

active

055460941

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.

REFERENCES:
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 4958382 (1990-09-01), Imanishi
patent: 5245350 (1993-09-01), Sroka

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