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BIS U Basic Manual
11
Measures for Improving the Operational Reliability of UHF Systems
11.2 Using Several
Each antenna generates a different spatial field distribution pattern because the obstacles in a
Antennas
multi-reflective environment are positioned differently for each antenna.
It can therefore be expected that the value for the local field intensity at the transponder position
will change as soon as an antenna in a different spatial position starts transmitting.
Figure 16:
Randomly positioned data carriers can also be detected in this kind of antenna configuration.
These antenna configurations can be used in the following scenarios:
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Antenna 2
Antenna 1
Arrangement of several antennas
Incoming/
Pallets containing goods are transported through the doors of a
outgoing goods
warehouse, trading house or industrial enterprise. In the corresponding
stationary antenna configuration (gantry arrangement, gate), individual
UHF data carriers affixed to pallets or even goods can be detected
automatically. The scanned data may contain information about the
origin and nature of the products.
Internal company
Gantries with antennas are installed at selected points within the
commodity flows
industrial company. Containers bearing data carriers are detected when
they pass through the gantries. An overall picture of the flow of
products throughout the production sequence can be obtained by
analyzing the scanned data.
Non-orientated
Affixing several data carriers to rotationally symmetrical goods or
data carriers
containers, for example, is not viable because of data consistency
issues and the costs involved. The only way to reliably detect data
carriers without a specific alignment is through the use of antennas
aligned towards the unidentified product from different angular
positions.
Antenna 3
Antenna 4
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