Siemens SIMATIC RF600 System Manual page 52

RF600 system planning
4.3 Antenna configurations
Antenna alignment and antenna spacing for the RF640R with an internal antenna
Antenna configuration
A
C
E
F
Optimization of the antenna arrangement
SIMATIC RF620R, RF640R with internal antenna
The RF620R and RF640R have an integrated, circular polarized antenna. This means that
the type of antenna cannot be freely selected. This means that the interference spacing in
arrangement E is greater than in arrangement F (see section Auto-Hotspot).
Note
Rotation of the reader through 90° around the z axis
Since the horizontal electrical aperture angle of the RF620R antenna is greater than the
vertical aperture angle, the effects on adjacent readers can be reduced by using the reader
as shown in arrangement F (see arrangements E and F in section Auto-Hotspot).
With the SIMATIC RF660A antenna
The electrical aperture angles (vertical and horizontal) of the RF660A antenna are identical.
Therefore, the robustness of the readers' access to transponder data cannot be optimized
further by rotating them around the antenna axis.
With the RF640A/RF642A antenna
The electrical aperture angles (vertical and horizontal) of the RF640A/RF642A antenna are
similar. Therefore, the robustness of the readers' access to transponder data can be
optimized only to a limited extent by rotating around the antenna axis.
Application example for RF620R/RF630R
The following example illustrates measures for increasing the reliability of data access to
transponders for readers with internal antennas:
● The antennas are placed next to each other and are aligned parallel to each other (see
● The readers have been rotated through 90° around the z axis.
The table below provides you with an overview of the minimum spacing to be maintained at
a radiated power of 27 dBm with a maximum number of reachable transponders:
50
Antenna alignment
Back to back
Pointing at each other
Side by side (long side)
Side by side (short side)
arrangement B in section Auto-Hotspot).
Minimum spacing required = D
RF640R with internal antenna
0.4 m
4.0 m
1.4 m
2.0 m
System Manual, 05/2012, J31069-D0171-U001-A13-7618
SIMATIC RF600