Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2006-04-28
2008-10-21
Wimer, Michael C (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C340S572700, C235S492000
Reexamination Certificate
active
07439933
ABSTRACT:
To provide an RFID (a signal processing circuit) equipped with a single rectangular spiral antenna and being capable of transmitting and receiving an electric power and signal by a plurality of frequency bands therewith, the present invention limits a longitudinal dimension (long sides) of the rectangular spiral antenna designed for transmission and reception of carrier of the HF band thereby to the length suitable for transmission and reception of carrier of the UHF band thereby as well as a widthwise dimension thereof so as to prevent a current waveform due to the carrier of the UHF band from reversing in phase at one of the long sides thereof.
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Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Wimer Michael C
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