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Telescopic-antenna-for-portable-telephones

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Telescopic antenna for portable telephones

Details

Inventors: Egashira, Yoshimi;
Assignee: Harada Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Wimer; Michael C.
Assistant Examiner: Ho; Tan
Attorney, Agent or Firm: Koda and Androlia

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.

DETAILED DESCRIPTION The object of the present invention is to provide a telescopic antenna for a portable telephone wherein: the internal volume of the main body of the housing can be reduced, so that there is no danger of any interference with the compactness and light weight of the portable telephone; the radiating portion of the antenna is located at a height of approximately .
lambda.
/4 or greater above the top of the housing, so that there is no danger that the radiated electromagnetic waves will have a deleterious effect on the human body, and so that any drop in the sensitivity of the antenna that might be caused by the absorption or attenuation of radiant energy by the human body can be prevented; the antenna is safe and simply constructed; and the antenna is superior in performance.
The following means are adopted in the present invention in order to solve the problems and accomplish the object: (a) In particular, the telescopic antenna for a portable telephone according to the present invention comprises: an antenna mount consisting of a hollow bulging member which is installed so as to protrude locally from the top of a portable telephone housing; a first antenna which is provided inside the antenna mount with the base end of the first antenna connected to a feeder cable and has an electrical length set at .
lambda.
/4, where (lambda) is the wavelength of the electromagnetic waves in the frequency band used; and a second antenna which is installed parallel to the first antenna at a prescribed distance from the first antenna and provided so as to be retracted into and extended from said housing via the antenna mount, the second antenna being provided with a base end to be connected to an earthing means of the housing when the second antenna is extended from the housing and having an electrical length set at 3 .
lambda.
/4.
When the second antenna is extended from the housing, a J-form antenna is formed by the first and second antennas; and when the second antenna is accommodated inside the housing, an internal antenna which is used for incoming calls is formed by the first antenna alone

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