Dual band antenna means incorporating helical and elongated radi

Details Dual band antenna means incorporating helical and elongated radi Dual band antenna means incorporating helical and elongated radi

1997-11-10

2000-05-02

Wong, Don

Communications: radio wave antennas

Antennas

Spiral or helical type

343702, H01Q 136, H01Q 124

Patent

active

060578076

ABSTRACT:
A multi-band antenna for mounting on the housing of a hand-portable telephone, the antenna comprising a feed portion and an antenna whip, arranged to slide into and out of the telephone to retracted and extended positions and combined with a multi-band helical structure. There are alternative ways disclosed of arranging the helical structure and other possible radiating elements of the antenna means to attain operability within separated frequency bands, for example, at 900 and 1800 MHz. In some configuration, the antenna means requires an impedance matching circuit in order to be operable at different frequency bands.

REFERENCES:
patent: 4442438 (1984-04-01), Siwiak et al.
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 5469177 (1995-11-01), Rush et al.
patent: 5583520 (1996-12-01), Thill
patent: 5650789 (1997-07-01), Elliott et al.
patent: 5734351 (1998-03-01), Ojantakanen et al.
patent: 5764191 (1998-06-01), Tsuda
patent: 5945964 (1999-08-01), DeGroot et al.

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