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Characteristics and specific Limits of the Antennas
Limits for the compliant use of the Low Range Antenna according to EN 50364
ULoRa
LoRa
Occupational exposure
Limits head and body 10 W/kg
Limits local limbs 20 W/kg
P
in
* = 1 W
P
in
= 0.5 W
General exposure
Limits head and body 2 W/kg
Limits local limbs 4 W/kg
P
in
= 1 W
P
in
= 1 W
P
in
= 0.1 W
P
in
= 0.5 W
*P
in
= conducted power at antenna input
ULoRa can always be supplied with 1 W conducted power. For occupational exposure, the LoRa antenna can be sup-
plied with 0.5 W conducted power. If persons from the general public are in direct contact with the antenna with their
head or body, the input power of the LoRa antenna should be reduced to 0.1 W.
11.2
Mid Range Antenna
The Mid Range Antenna family includes the MiRa and the S-Mira Antenna.
Technical features:
■
100° aperture angle
■
Dimensions 15 cm x 12 cm
■
Antenna gain = 2,5 dBiC (MiRa)
■
= -12 dBiC (S-MiRa)
■
Integration in applications with limited space
■
Suitable for industrial environment and outdoor use (IP 67)
■
Circular polarisation
■
Low axial ratio
■
Low VSWR
■
For bulk and single tag applications
Typical applications are
■
Forklift Trucks
■
Small industrial Trucks
■
Logistics Gates
■
Access Systems
The fields from 20 cm in front of the antenna, up to the maximum reading range are clearly below the reference values
According to the standard evaluation procedure, these antennas are always compliant.
Since the MIRA Antenna can also be used for special applications with a reading range of less than 20 cm, numerical
calculations for the specific absorption rate (SAR) in the range 0 ... 20 cm were also performed.
12 cm
15 cm
