Application Example - Siemens SIMATIC RF600 System Manual

Antennas
6.2 Guidelines for selecting RFID UHF antennas
6.2.7

Application example

This section contains an example with specific values. Using this example it is possible to
understand how the complete selection procedure for antennas, cables, and adapters as
well as the settings could be carried out on an RF600 system reader.
In the example it is assumed that you wish to use your SIMATIC RF600 system with your
third-party components in Germany (ETSI EN 302 208 V1.2.1).
Procedure
1. Compare the technical specifications of your antenna with the values required by the
2. Compare the technical specifications of your cables and connectors with the values
170
SIMATIC RF600 system.
Values
Frequency band
Impedance
VSWR
Polarization
Antenna gain
Beam width
horizontal/vertical
Front-to-back ratio
Spurious lobe suppression
Axial ratio
Maximum power
Since the specific VSWR value of the antenna does not agree with the value required by
the system, you must have this value checked. Therefore contact your antenna vendor or
an EMC laboratory.
required by the system.
For example, you can use cables of type "LMR-195" from the company "TIMES
MICROWAVE SYSTEMS". Suitable cables have e.g. an outer diameter of 5 mm. The
company offers various designs of cables depending on the requirements. Numerous
connectors are also available for their cables.
Values
Cable attenuation
Impedance
Values
Type of plug on reader side
Type of plug on antenna side N socket
Example antenna
865 to 870 MHz
50 Ohm
<1.5
Circular, right
8.5 dBi
63°
-18 dB
-16 dB
2 dB
6 W
Example cable
36.5 dB / 100 m at 900 MHz
With an assumed length of
10 m, this results in a loss of
3.65 dB.
50 Ohm
R-TNC socket
System Manual, 10/2009, J31069-D0171-U001-A8-7618
Required values OK?
865 to 868 MHz OK
50 Ohm OK
<1.24 Not OK
OK
>6 dBi OK
≤70° OK
≥10 dB OK
≥10 dB OK
≤3 dB OK
≥4 W OK
Required values
≤4 dB
50 Ohm
Example connector
R-TNC plug
N plug
OK?
OK
OK
OK?
OK
OK
SIMATIC RF600