Siemens SIMATIC RF600 System Manual page 54

RF600 system planning
4.3 Antenna configurations
Antenna cable loss
In order to be able to transmit the available UHF power from the RF600 reader to the
antenna or antennas, the antenna cable loss should not exceed a value of approx. 5 dB.
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. In other
words, the cable loss increases the higher the transmitter frequency is. 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.
Notes on use
Shielding of the antenna cable
Coaxial antenna cables generally have a shielded design and therefore radiate little of the
transmitted power to the environment.
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 the type "Reverse Polarity R-TNC" (male
connector) for your antenna cables to ensure correct connection to the RF600 reader
interface.
Figure 4-10
You can find more information in the catalog data of your cable vendor.
54
Thread standardization
System Manual, 06/2019, J31069-D0171-U001-A22-7618
SIMATIC RF600