Antenna Cables; Selection Criteria - Siemens SIMATIC RF600 System Manual

Antennas
6.4 Guidelines for selecting RFID UHF antennas
Read area depending on the beam width
①
Vertical beam width
②
Horizontal beam width
6.4.5

Antenna cables

6.4.5.1

Selection criteria

You must observe the criteria listed below when selecting the appropriate antenna cable for
your third-party antenna.
Characteristic impedance
Definition
If the input impedance of a device does not agree with the cable impedance, reflections occur
which reduce the power transmission and can result in the appearance of resonance and thus
to a non-linear frequency response.
Specifications
● You must only use coaxial antenna cables when connecting a third-party antenna.
● This antenna cable must have a nominal characteristic impedance of Z = 50 Ohm.
Antenna cable loss
In order to be able to transmit the available UHF power from the SIMATIC RF660R reader to
the antenna(s), the antenna cable loss must not exceed a value of approx. 4 dB.
196 System Manual, 06/2010, J31069-D0171-U001-A10-7618
Draft Version 02.06.2010
SIMATIC RF600