Antenna element having a zig zag pattern

Details Antenna element having a zig zag pattern Antenna element having a zig zag pattern

1999-10-13

2001-07-03

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S749000, C343S702000

Reexamination Certificate

active

06255999

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an antenna, and, more particularly, to an antenna for a personal communications device.
BACKGROUND OF THE INVENTION
A dual band antenna disclosed in U.S. patent application Ser. No. 09/206,445, has a coil antenna element with a first winding at a feed point, and a second winding at a far end of the antenna. A reactive or parasitic antenna element is provided on a film that forms a wrapping over the coil. The film provides a thin dielectric between the coil and the reactive element, which capacitively couples the coil and the reactive element. At lower frequencies, the reactive element is electrically inactive, while at higher frequencies, the element establishes a short circuit.
SUMMARY OF THE INVENTION
It is desired to provide an antenna element that has a simplified assembly procedure and tuning procedure, and is less sensitive to manufacturing tolerances than a coil antenna element.
It is desired to provide a capacitive load element that is easily and accurately positionable in relationship to a radiating antenna element to couple to the radiating antenna element.
It is desired to provide an antenna element for a dual band antenna.
It is desired to provide an antenna element having a radiating antenna element and a capacitive load element that is capacitively coupled to the radiating antenna element to provide a dual band antenna element.
It is desired to provide an antenna element that has a film on which a radiating antenna element and a capacitive load element are capacitively coupled to provide a dual band antenna element.
The present invention provides an antenna element having a radiating element on a film of dielectric material, the dielectric material having thereon a capacitive load element, the radiating antenna element and the capacitive load element being capacitively coupled across a thickness of the film with the film having the radiating element thereon being formed into a sleeve shape, and the radiating antenna element and the capacitive load element capacitively couple to provide a dual frequency band antenna element.


REFERENCES:
patent: 3656168 (1972-04-01), Stropki
patent: 4598276 (1986-07-01), Tait
patent: 5363114 (1994-11-01), Shoemaker
patent: 5559524 (1996-09-01), Takei et al.
patent: 5668559 (1997-09-01), Baro
patent: 5724717 (1998-03-01), Gherardini
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patent: 6028567 (2000-02-01), Lahti
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patent: 6061036 (2000-05-01), MacDonald, Jr. et al.
patent: 198 58 090 A1 (1999-06-01), None
patent: WO 96/38879 (1996-12-01), None
patent: WO 97/49141 (1997-12-01), None
patent: WO 98/28814 (1998-07-01), None
Abstract & Drawings Only, U.S. Patent Application No. 09/206,445, filed Dec. 7, 1998.

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