OBID i-scan
®
Montage / Installation
ID ISC.MR200-A/E
FEIG ELECTRONIC GmbH
Page 39 of 56
M40400-4de-ID-B.doc
E N G L I S H
3.3 Antenna connection
An SMA socket is provided on the circuit board for connecting the external antenna.
The maximum tightening torque of the SMA sockets is 0.45 Nm (4lbf in).
Caution:
Greater tightening torque will destroy the connector.
Terminal
Description
X2
External antenna connection
(input impedance 50
Ω
)
Table 3-2: Connecting the external antenna
Notes:
•
Maximum range is achieved when the input impedance of the antenna is calibrated to a
value of 50
Ω
∠
0°.
•
The optimal operating Q of the antenna should be in a range of Q
O
= 10...40. To
determine the operating Q, the antenna must be supplied with a 50
Ω
source, such as a
network analyzer or a frequency generator.
•
When connecting the antenna be sure that the permissible limits specified by national
code with respect to RF installations are not exceeded.
•
To achieve optimum read distances, the length of the antenna lines should be
(3.6 m
±
0.1 m) + n * 7,20m.
•
To meet national code with respect to RF installations, the antenna feed line must be
equipped with the supplied
∅
28 mm x 20 mm EMC ferrite ring core. The antenna line
must be wrapped tightly around the EMC ferrite ring core at least 4 times. The distance
between the Reader connection and the ring core should be no greater than 20 cm (see
Fig. 3-6).
max.
20cm
Fig. 3-6: Antenna cable with EMC ferrite ring core
