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Antennas
6.3 SIMATIC RF620A
6 6 .3.6.4
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 ante e nna gain [dBr]
0
-3
-6
-9
-12
-15
-18
Example
As can be seen from the Antenna pattern ETSI (Page 260), the maximum antenna gain is -
5 dBi. In the vertical plane, the antenna gain has dropped to approx. -11 dBi at +40° and
320°. This means that the dBr value is -6. The antenna range is only 50% of the maximum
range at ± 40° from the Z axis within the vertical plane (see line shown in blue in the
directional radiation pattern: Characteristic of the vertical plane of the antenna and the
associated representation of the reference system).
266
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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