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Antennas
6.5 SIMATIC RF642A
6 6 .5.6.3
Interpretation of directional radiation patterns
The following overview table will help you with the interpretation of directional 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
Example
As can be seen in Directional radiation pattern in the ETSI frequency band (Page 303), the
maximum antenna gain in the horizontal plane is 6 dBi. In this plane and with the parallel
polarization axis at +70° or 300°, the antenna gain dropped to about 0 dBi. Therefore the dBr
value is 6. The antenna range is only 70° of the maximum range at + 50° or +300° from the Z
axis within the horizontal plane (see values shown in red in the directional radiation pattern:
Characteristic of the vertical plane of the antenna (Page 302) and the associated
representation of the reference system (Page 302)).
306
Read/write range [%]
100
70
50
35
25
18
13
System Manual, 06/2019, J31069-D0171-U001-A22-7618
SIMATIC RF600
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