Interpretation Of Directional Radiation Patterns; Antenna/Read Point Configurations; Installing/Mounting - Siemens SIMATIC RF600 System Manual

Typical antenna gain in the frequency range 865
to 868 MHz
Antenna axis ratio
See also Chapter Guidelines for selecting RFID UHF antennas (Page 181).
5.1.2.4

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 antenna gain [dBr]
0
-3
-6
-9
-12
-15
-18
Example
As one can see from the section Antenna diagram for RF620R (ETSI) (Page 85), the maximum
antenna gain is 0 dB. In the Azimuth diagram, the antenna gain falls by 3°dB at approximately
± 39°. Therefore the dBr value is -3. The antenna range is only 50% of the maximum range at
± 39° from the Z axis within the horizontal plane.
5.1.2.5

Antenna/read point configurations

The RF620R reader has an internal circular polarized antenna. You can cover one read point
with this antenna. When several RF620R readers are used, the readers are addressed via the
SIMATIC level.
5.1.3

Installing/Mounting

Requirement
SIMATIC RF600
System Manual, 06/2010, J31069-D0171-U001-A10-7618
Draft Version 02.06.2010
7.3 dBic ± 0.5 dB
<1 dB
Read/write range [%]
100
70
50
35
25
18
13
Readers
5.1 RF620R reader
91