RF600 system planning
4.4 The response of electromagnetic waves in the UHF band
RF600
4-14
System Manual, 09/2005 Edition, J31069 D0171-U001-A0-7618,
4.4.2
Influence of metals
Metal can have an effect on the electromagnetic field depending on the arrangement or
environment. The effect ranges from a hardly determinable influence through to total
blocking of communication. The term metal in this context also includes metallized materials
that are either coated with metal or shot through with metal to such an extent that UHF
radiation cannot penetrate or only to a minimal extent.
The effect of metal on the electromagnetic field can be prevented as follows:
•
Do not mount tags on metal
•
Ensure there are no metallic objects at close range to the antenna
•
Ensure there are no metallic objects in the propagation field of the antenna and
transponder
Tags mounted directly onto metal
In general, tags must not be mounted directly onto metallic surfaces. Due to the nature of the
magnetic field, a minimum distance must be maintained between the tag antenna and
conductive materials.
The minimum distance to metal must be greater than 5 cm. The larger the distance, the
better the function of the transponder.
Exception:
Tags that are designed for direct mounting on metal.
