Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2005-11-08
2005-11-08
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S7000MS, C340S572700
Reexamination Certificate
active
06963317
ABSTRACT:
A radio frequency identification (RFID) tag antenna system includes a planar two arm logarithmic spiral antenna with a suitably small form factor. There are two arms are of conductive foils or etched copper plating on a substrate the extend outwardly from a center in a logarithmic fashion. The two arms are identical to each other but rotated in the plane by 180 degrees. The arms also grow proportionally in width as they extend outward, but at any given distance from the center the width of both arms are equal to each other and, preferably, equal to the spaces between the arms. An impedance matching network receives the RF signal received by the dual spiral antenna and feed the RF signal to an electronic circuit that rectifies and multiplies the signal to form a DC signal that charges a capacitor. The electronics may be built onto the same substrate as the planar antenna, but preferably, the electronic circuit is built onto a second substrate is mounted, making appropriate electrical connections, to the antenna bearing substrate.
REFERENCES:
patent: 5313216 (1994-05-01), Wang et al.
patent: 5621422 (1997-04-01), Wang
patent: 6281794 (2001-08-01), Duan et al.
patent: 6359444 (2002-03-01), Grimes
Roberts Raymond A.
Vogt, III John V.
Zuk Philip C.
Alemu Ephrem
Cesari and McKenna LLP
Fairchild Semiconductor Corporation
Paul, Esq. Edwin H.
Wong Don
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