Antenna for reader/writer

Details Antenna for reader/writer Antenna for reader/writer

1996-09-27

2000-10-24

Wimer, Michael C.

Communications: radio wave antennas

Antennas

High frequency type loops

343867, 343842, 235492, H01Q 2128

Patent

active

061374474

ABSTRACT:
In an antenna 1a for reader/writer of an interrogator in a non-contact data carrier system comprising the interrogator and a transponder, the antenna for reader/writer of the interrogator comprises a transmitting antenna 2 for transmitting a signal to the transponder and a receiving antenna 3 for receiving a signal from the transponder, and the receiving antenna 3 is a loop coil located at a position where magnetic fields of opposite polarities are induced in the receiving antenna 3 by magnetic coupling between the receiving antenna 3 and the transmitting antenna 2 and where the magnetic fields of opposite polarities cancel out each other. Preferably, the transmitting antenna 2 is comprised of at least two loop coils 2a, 2b for generating magnetic fields of opposite polarities to each other.

REFERENCES:
patent: 4922261 (1990-05-01), O'Farrell
patent: 5047715 (1991-09-01), Morgenstern
patent: 5274332 (1993-12-01), Matsubara
patent: 5448110 (1995-09-01), Tuttle et al.
patent: 5602556 (1997-02-01), Bowers
patent: 5821525 (1998-10-01), Takebayashi

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