Installation Manual

OBID i-scan
®
Installation ID ISC.ANT310/310-A
FEIG ELECTRONIC GmbH Page 14 of 22 M90401-1e-ID-B.doc
4.7 Antenna tuning
The antenna has been factory-tuned on a wood block at an impedance of 50 Ω. If it is installed in a
defined distance to metal or other magnetically conductive materials, no adjustment or re-
adjustment will be necessary.
After installation in different ambience conditions, the antenna may be re-tuned for a limited sector
with the help of jumpers. For this purpose you will either need an SWR – meter or a measuring
device (antenna/impedance analyser) in order to determine the impedance at 13,56 MHz.
Before tuning, all antennas and antenna cables must be fixed in place. The antenna should be
connected to the reader directly. A additional necessary power splitter or transformer should be
looped in after the tuning procedure.
Figure 9: The antenna’s impedance in dependence on the frequency
(measured at the SMA Connector)