User's Manual

23
3.2 Signal attenuation/reflection
Signal attenuation refers to the natural attenuation of signal
strength with the distance increasing. Meeting blocks during
signal transmission might also cause attenuation.
The blocks probably affecting the transmission of radio
frequency signal include:
ø Close-ended space comprised of concrete wall, floor
and ceiling;
ø Metal surface surround ing antenna or tag;
ø Water or other liquids surrounding antenna or tag;
Almost every object (furniture or blocks) in the path of
transmitting radio frequency signal will cause attenuation to
different extent. With an elaborate adjustment to the installation
position, the attenuation of radio frequency caused by blocks
can be lessened to possible least.
The reflection from the metal or metalized surface back close
to the electronic tag can affect the signal attenuation. In some
situation, this could be solved by slightly increasing reading
distance, but at the same time some ‘dead corners’ will appear