Siemens Simatic RF600 System Manual page 68

RF600 system planning
4.3 Antenna configurations
Example
As one can see in the antenna diagrams (polar or linear) above, the maximum antenna gain
0 dB is standardized. The dBr value -3 is shown graphically in both diagrams. At angles of
Phi = ± 35°, the range of the antenna is only 50% of the maximum range.
Specifications
Selection of the beam angle within the approval directives also has effects on the field of
application, since a larger beam angle allows a larger area to be covered by RFID
transponders. The following graphic clarifies the cross-section of the beam cone with the
covered area.
①
Third-party antenna
②
Beam angle
③
Covered area
④
Activation or reading range
The reading range depends on the horizontal and vertical beam widths in the case of equal
distances from the transmitter antenna. Depending on the mechanical mounting and the ratio
between the vertical beam width
shown in the following graphic:
68
Beam angle: cross-section of the beam cone with the covered area
①
and the horizontal beam width
System Manual, xx/2014, J31069-D0171-U001-A15-7618
②
, read areas result as
SIMATIC RF600