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fl a t tra n sp o n d e rs li ke d isk o r ca rd
ro d -sh ap e d tra n sp o n d e rs (i . e . in g la s)
Inclination between antenna and transponder:
The maximum reading distance is achieved for (see figure above):
- disc type transponder, if they are in parallel to the antenna dish
- glass (ferrite) transponder, if they are perpendicular to the antenna dish.
Size and type of transponder
Generally speaking: The bigger the transponder, the larger the reading distance.
Environment such as temperature, electromagnetic interference, metal:
The reader has to be operated within the specified temperature range. The best results are ob-
tained in an undisturbed environment. Direct vicinity of metal may reduce the reading distance
considerably. Electromagnetic interference (caused by e.g. PC monitors, frequency controlled mo-
tors, generators for electric wire fences or other RFID reader) may also reduce the reading dis-
tance considerably.
Other ISO readers:
Because of mutual interaction especially while using HDX-transponders, the hand held reader
should not operate with other ISO readers in the same 4m radius.
Feedbacks:
To reach a maximal reading range, the ARE H5 uses a high sensitive multi channel amplifier. If
there is no transponder in the antenna field, following feedbacks are possible:
The fast clocked signal processor sends tiny disturb signals that inject into the amplifier. This way
a filter output can be produced, that is according to the signal of a transponder. Normally the in
the transponder code integrated error detection avoids, that such a signal is regarded as a valid
transponder code. Only with the datamars tansponder type in some rare case this way random
codes were generated. These codes stand out with cyclic number groups like EBEBEBEBEBEB or
00ABAB00ABAB.
If no datamars transponders are used in one application, we recommend to mask out the datamars
algorithm to avoid reading random codes. This can be done in the database operation mode. See
chapter 6.
