19/09/18
Page 12 of 67
ASR650 Operational Manual
2. Double Antenna
The ASR650 offers the possibility to connect two single panels to one reader. In order to make
this possible, you require a double antenna adapter (
‘
ASB200
’). The panels are normally arranged
in parallel orientation and face each other in order to build one common field. Comparable to
magnets, the single fields of the antennas can attract or repel each other, depending on their
phasing.
Antennas in phase:
In this setup the antennas are “in phase”. This is also called parallel- or Helmholtz antenna. The
optimum tag orientation is similar to the one of the single antenna (transponder coil parallel to the
panels). The reading distance can be significantly increased compared to a single antenna. In
addition, it does not matter on which side of the animal the ear tag is attached since the tag is
close to any of both panels.
Please avoid very close distances between both antennas! Since the
coupling of the two coils can be too high in such a case, the reader might
not be able to tune the antenna correctly anymore. For two APA206
antennas in this setup, the panels should have a minimum distance of 50
centimeters.
Phasing
Phasing