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Product Description
7.2.2
KRAI Antennas
KRAI antennas are a special variant of Kathrein antennas. This allows the antenna properties to be changed dynam-
ically. These changes are controlled by the Kathrein RFID reader via the existing antenna cable. External controls or
connections are not necessary. This improves the reading properties in the system and simplifies the installation of the
antennas.
The designation KRAI stands for Kathrein RFID Antenna Interface
The following antennas are available and functions can be fulfilled:
Order number
Type
Description
Function
52010525 / 52010526 SMSH KRAI ETSI / SMSH KRAI FCC
Smart Shelf Antenna
Antenna cascading
52010340
ARU 8500 ETSI
Switch Beam Antenna
Direction detection
52010335 / 52010336 WRA 7070 KRAI ETSI /
WRA 7070 KRAI FCC
Polarisation Switching
Antenna (linear/circular)
Polarisation switching
LED
8
Product Description
8.1
Low Range Antenna
The low-range antennas are a unique series of antennas developed exclusively for the reading range < 20 cm. On the
one hand, this is necessary to detect reading positions very precisely, as the transponder is only read when it is spa-
tially very close in front of the antenna. On the other hand, it is very easy to write precisely on transponders with the low
range antennas, because only the tag that is physically close to the antenna can be written to. A complex selection pro-
cess is not necessary.
With dimensions of 90 x 63 mm, these antennas have a high field concentration in the near field, with significantly
reduced antenna gain in the far field. With these characteristics, the antennas achieve excellent read/write performance
at ranges of up to 10 cm with a typical selectivity of 5 cm. Low range antennas are available as LORA (Low Range) and
ULORA (Ultra Low Range). The ULORA antenna is designed to read dipole-shaped tags ("far-field tags") at extremely
close range. These antennas can also read loop-shaped tags ("near-field tags") up to 3 cm. The LORA was developed for
longer ranges and is particularly suitable for near-field tags.
