Reader or transmitter and/or receiver comprising a shielded...

Details Reader or transmitter and/or receiver comprising a shielded... Reader or transmitter and/or receiver comprising a shielded...

2006-08-29

2006-08-29

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S742000, C343S867000, C343S842000, C343S748000, C235S492000

Reexamination Certificate

active

07098866

ABSTRACT:
The reader or transmitter and/or receiver (22) includes a sheathed antenna formed of two groups of turns or coils (6, 8, 9; 16, 17). The first group of turns or coils forms a sheathed antenna. The second group includes two coils (16, 17) arranged between the central coil (6) and respectively the two end coils (8, 9) of the first group. The second group of coils is powered in phase quadrature relative to the first group of coils, the set of coils being arranged so as to obtain a magnetic field (H) whose amplitude (A) is approximately constant along the central axis (24) of the antenna inside the overall inner volume of the latter.

REFERENCES:
patent: 6137447 (2000-10-01), Saitoh et al.
patent: 6943680 (2005-09-01), Ward, Jr.
patent: 0 440 370 (1991-08-01), None
patent: PCT WO 96/38877 (1996-12-01), None
Patent Abstracts of Japan, vol. 2002, No. 03, Apr. 3, 2003 (JP 2001-326526).
International Search Report completed Jul. 25, 2003 (mailed Aug. 1, 2003) in corresponding International Appln. PCT/EP 02/12195.

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