Retractable broad-band antenna for portable telephones

Details Retractable broad-band antenna for portable telephones Retractable broad-band antenna for portable telephones

Filed on

1996-09-09

Date issued

1997-11-25

Examiner

Le, Hoanganh T.

Patent Class

Communications: radio wave antennas

SubClass

Antennas

SubSubClass

With radio cabinet

Other Related Categories

343895, 343901, H01Q 124, H01Q 136

Type

Patent

Status

active

Patent number

056917309

Description

ABSTRACT:
A retractable broad-band antenna for a portable telephone which includes a first antenna element which resonates in the lower region of the frequency band, a second antenna element which is coupled in series to the first antenna element via electrostatic capacitance and resonates in the higher region, and a call-receiving third antenna element mounted to the tip end of the second antenna element. The first and second antenna elements are shortened antenna elements in a form of helical coils. The first antenna element has an electrical length of .lambda.L/8 and is a non-grounded type having broad band characteristics by means of a matching device; and the second element has an electrical length of .lambda.H/2 wherein .lambda.H and .lambda.L are respectively the wave lengths at a center frequency of the higher and lower region of the frequency band used. The third antenna element preferably has a conductive contact so that the tip portion of the second antenna element, which stays outside of the telephone housing when the base portion of the second antenna element is retracted into the housing, can act as a call-receiving antenna element.

REFERENCES:
patent: 5134419 (1992-07-01), Egashira
patent: 5469177 (1995-11-01), Rush et al.

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