Installation Manual

OBID i-scan
®
Installation ID ISC.ANT310/310-A
FEIG ELECTRONIC GmbH Page 18 of 22 M90401-1e-ID-B.doc
5 Course of the antenna’s magnetic lines of electric flux
Figure 1 shows the field alignment of a simple single loop antenna. This is the most simple and
most frequently used antenna type in the sector of OBID
®
i-scan. Its size depends highly on the
reading range requirements and the place of application as well as the national limiting values.
Figure 1: course of the magnetic lines of electric flux of a single loop antenna
The working range of an antenna depends very much on the position and alignment of the
transponder. A single loop antenna has the highest range in the centre of the antenna and if the
transponder is aligned parallel to the antennas surface.
The transponder is powered only when sufficient field lines flow through him. Therefore, the activa-
tion of the transponder in the direction perpendicular to the antenna surface, within the antenna
area, is not possible.
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