Identification Systems
English, Revision 03, Date: 07.02.2012
6
1.4.2
Transmission Range and Function
The field intensity of the magnetic alternating field decreases with an increasing dis-
tance between transponders and reading antenna. Thus the information exchange is
only feasible within a certain area.
The field length L and the field width B of the transmission range (see Figure 2 auf Seite
6) will be defined via the parallel centre line through the reading antenna (road). The
distance between reading antenna and the sectional plane is indicated as S.
A faultless function of the system is guaranteed if the transponders and the reading
antenna move towards each other with the distance specified by S and within the
range defined by L and B - provided that they are properly aligned. The transponder
(line B) will even be detected in case of an offset (centre deviation). Then the position-
ing impulse will be output with an offset.
Figure 2
Length and width of the interception area (view from above)
Positioning is effected according to the field compensation method. The resulting field
for the transponder will be deleted centrically to the reading station. At the transition
to this region (registration gap or datafree range) the position of the transponder at the
object will be detected exactly and indicated (see table 3 on page 7).
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