Siemens SIMATIC RF600 Series System Manual page 186

Antennas
6.2 RF620A antenna
Operation in the USA, Canada
Note
Limitation of the radiated power to 4000 mW EIRP (36 dBm EIRP)
To meet the FCC and IC requirements, the radiated power may not exceed 4000 mW EIRP
(36 dBm EIRP). Therefore the system must satisfy the following relation:
• Conducted power P dBm of the RF600 reader (< 30 dBm)
• Antenna gain G
• Cable loss a
P(dBm) ≤ 30 dBm - (G
By selecting the correct country profile/frequency range and setting the radiated power (see
technical specifications of the reader being used) and setting the parameters for antenna
gain and cable loss, the maximum radiated power will not be exceeded.
6.2.6 Antenna patterns
6.2.6.1 Alignment of transponders to the antenna
Polarization axis
Since the RF620A antenna has linear polarization, it is necessary to consider the alignment
of the transponders with regard to the polarization axis of the antenna.
The polarization axes of antenna and transponder must always be parallel. The symbol on
the antenna indicates the polarization axis.
Figure 6-2
186
dBi in the FCC frequency band (≤ -5 dBi)
i
dB (≥ 1 dB)
k
- 6 dBi) + a
i k
Polarization axis
System Manual, 10/2016, J31069-D0171-U001-A19-7618
SIMATIC RF600