Identification Systems
English, Revision 02, Date: 20.01.2015
6
1.3.2
Reception Ranges and Function
Positioning is carried out according to the field compensation method. In the center of
the reading antenna the resulting field for the transponder is erased. This data-free
range D, in which no telegrams are output, has a width of 25 to 30 mm at nominal read-
ing height S, see Figure 2.
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 the reception ranges I and II, see Figure 2. Viewed from the top the
recption ranges limited to the field lenght L and field width B, see Figure 3.
Figure 2
Detection Ranges I and II, data-free range and nominal reading distance S,
side view
Figure 3
Detection ranges, top view
NOTE!
At any given time only a single transponder may be located
within the reception ranges. The following sketch includes sev-
eral transponders in order to illustrate the behaviour at diffierent
transponder positions.
Reading Antenna
Transponder
Reception ranges
Area I
Area II
Roadway
Data-free range
D
Direction of Travel F
L
magnetic
Line A
Transponder
Reading Antenna
B
Reception Ranges
field lines
Area I
Area II
