Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2005-12-13
2005-12-13
Vannucci, James (Department: 2828)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S702000
Reexamination Certificate
active
06975280
ABSTRACT:
A helical antenna is provided that simultaneously resonates at a plurality of frequencies. This antenna comprises a first coil having a first end for termination in a transmission line feed port. A second coil has a first end connected to the first coil second end, and an unterminated second end. In some aspects, a third coil is used, connected to the second coil second end, with an unterminated end. The coils have axial lengths, a wire gauge, and a coil diameter. The axial lengths are approximately equal to a number of turns times a spacing between turns. In addition, the antenna further comprises a first dielectric encompassed by the first and second coils and a second dielectric that encompasses the first and second coils. The antenna resonates at a first frequency and a second frequency, non-harmonically related to the first frequency, in response to the first and second coils.
REFERENCES:
patent: 5179387 (1993-01-01), Wells
patent: 5909196 (1999-06-01), O'Neill, Jr.
patent: 5963871 (1999-10-01), Zhinong et al.
patent: 6201500 (2001-03-01), Fujikawa
patent: 6375479 (2002-04-01), Johnson et al.
patent: 6501437 (2002-12-01), Gyorko et al.
patent: 6734831 (2004-05-01), Makino
Kyocera Wireless Corp.
Vannucci James
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