Identification
Integration Manual
ID ISC.LRM1002-E
FEIG ELECTRONIC GmbH
Page 8 from 23
M21110-3e-ID-B.docx
3.2.1 Antenna connection
The SMA socket „ANT1“ is located on the circuit board for connecting the antenna to the ID
ISC.LRM1002.
A external LED can also be supplied with 6,5 V
through the antenna terminal.
This can be controlled by software. The maximum current draw is then not allowed to exceed
20mA.
The voltage is not sufficient to support the dynamic antenna tuning board ID ISC.DAT
Connection of a ID ISC.DAT (Dynamic Antenna Tuning Board)
The maximum tightening torque for the SMA socket is 0.45 Nm (4.0 lbf in).
Attention:
Exceeding the tightening torque will destroy the socket.
Terminal
Description
ANT1
For connecting the antenna
(Input Impedance 50
)
Table 2: Antenna jack
The standing wave ratio VSWR for the antenna should not exceed a value of 1,3.
For reaching optimal read ranges the coaxial cables between readers and antenna must
have defined lengths. For all antennas of the company FEIG ELECTRONICS GmbH and
for all antennas which with the tuning boards (e.g. ID ISC.DAT, ID ISC.MAT b and ID
ISC.MAT s) of FEIG ELECTRONICS GmbH is made the optimal length of the coaxial ca-
ble is 1.35 m (Article No. 1654.004.00.00, Name ID ISC.ANT.C-B). See also Mounting
Manual Power Splitter ID ISC.ANT.PS-B and ID ISC.ANT.MUX.
The optimum operating Q factor of the antenna should be in a range of Q
oper
= 10...30. To
determine the operating Q the antenna must be supplied with a 50 Ohm source such as
a network analyzer or frequency generator.
To prevent external coupled noise, the antenna cable must be fitted with a EMC ferrite
ring core
28 mm x 20 mm.
The antenna line must be wound around the ring core for at
least 4 turns. The distance between the Reader termination and the ring core should be
maximum 10 cm (see Figure 3).
When connecting an antenna, ensure that it does not exceed the permissible limits pre-
scribed by the national regulations for radio frequency devices.
Figure 3: Antenna line with EMC ring cores
