Antenna

Details Antenna Antenna

2005-10-04

2005-10-04

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S895000

Reexamination Certificate

active

06952186

ABSTRACT:
A helical antenna capable of operating at a plurality of different resonant frequencies. The helical antenna has a first helical antenna element, a second helical antenna element arranged coaxially with the first helical antenna element and coupled to the first helical antenna element through capacitive coupling, and a metal connection directly connected only to the first helical antenna element to fed the helical antenna. The first helical antenna element is fed through one end thereof to function as a quarter-wave antenna. The second helical antenna element is fed through capacitive coupling to function as a half-wave antenna.

REFERENCES:
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patent: 5754146 (1998-05-01), Knowles et al.
patent: 5771023 (1998-06-01), Engblom
patent: 5923305 (1999-07-01), Sadler et al.
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patent: 6163300 (2000-12-01), Ishikawa et al.
patent: 6388625 (2002-05-01), Fukushima et al.
patent: 6404392 (2002-06-01), Blom
patent: 10-22730 (1998-01-01), None
patent: 11-186823 (1999-07-01), None
patent: WO 99/26314 (1999-05-01), None
patent: WO 01/11721 (2001-02-01), None

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