Interpretation Of Directional Radiation Patterns - Siemens SIMATIC RF600 System Manual

Figure 6-15 Directional radiation pattern of the antenna (at 915 MHz, horizontal alignment)
6.3.3

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
SIMATIC RF600
System Manual, 06/2010, J31069-D0171-U001-A10-7618
Draft Version 02.06.2010
6.3 RF660A antenna
Read/write range [%]
100
70
50
35
25
18
13
Antennas
179