Notes On Use - Siemens SIMATIC RF600 System Manual

Dependency of the cable loss
The cable loss depends on two important factors:
● External characteristics of cable. These includes the cable length, diameter and design.
● As a result of the physical principle, the cable loss is also frequency-dependent, i.e. the
cable loss increases at higher transmitter frequencies. Therefore the cable loss must be
specified in the frequency band from 860 to 960 MHz.
Cable vendors usually provide tables or calculation aids for their types of cable which usually
include the transmitter and receiver frequencies as well as the cable length. Therefore contact
your cable vendor in order to determine the appropriate type of cable using the approximate
value referred to above.
6.4.5.2

Notes on use

Shielding of the antenna cable
Coaxial antenna cables always have a shielded design and therefore radiate little of the
transmitted power to the environment.
Note
Cable with double shielding
You should therefore preferentially select cable with double shielding since this provides the
best damping.
Bending radius of the antenna cable
The properties of the cable shield are influenced by mechanical loading or bending. You must
therefore observe the static and dynamic bending radii specified by the cable vendor.
Connectors and adapters
You must use connectors and adapters of type "Reverse Polarity R-TNC" (male connector)
for your antenna cables from a third-party supplier in order to guarantee correct connection to
the SIMATIC RF660R reader.
The figure below shows the standard for a suitable thread:
You can find more information in the catalog data of your cable vendor.
SIMATIC RF600
System Manual, 06/2010, J31069-D0171-U001-A10-7618
Draft Version 02.06.2010
6.4 Guidelines for selecting RFID UHF antennas
Antennas
197