Siemens SIMATIC RF600 System Manual page 68

RF600 system planning
4.3 Antenna configurations
①
Beam width
②
Spurious lobe
Interpretation of directional radiation patterns
The following overview table will help you with the interpretation of radiation patterns.
The table shows which dBi values correspond to which read/write ranges (in %): You can
read the radiated power depending on the reference angle from the directional radiation
patterns, and thus obtain information on the read/write range with this reference angle with
regard to a transponder.
The dBr values correspond to the difference between the maximum dBi value and a second
dBi value.
Deviation from maximum antenna gain [dBr]
0
-3
-6
-9
-12
-15
-18
66
Directional radiation pattern in linear representation
Read/write range [%]
100
70
50
35
25
18
13
System Manual, 05/2012, J31069-D0171-U001-A13-7618
SIMATIC RF600