IFM Electronic ANT805, Руководство по эксплуатации

Страница: 13 / 17

UK
RFID UHF antennas
13
6 Installation
6.1 Installation location
To reach the maximum range of the antennas there must not be any interfering
objects between the antenna ant the tag to be read� The operating principle of
the antenna is influenced by the type of fixing and the surrounding materials� To
ensure optimum antenna performance there should be no conductive objects in
the vicinity of the antenna� The following figures are given as sufficient distances:
The distance to large metal surfaces and the ground should be min� 70 cm
(see Figure 1)�
If the installation in front of a metal surface cannot be avoided, a mounting fixture
can be used establishing a distance of exactly 12 cm between the rear of the
antenna and the metal surface (see Figure 2)�
With direct installation on a metal surface (e�g� a plate as part of
a mounting fixture) use a square-shaped metal plate
which should not exceed the dimensions 16 x 16 cm (see Figure 3)�
In addition other objects such as tanks filled with liquids located in direct vicinity
affect the functions of the antenna�
min 70 cm
min 70 cm
min 70 cm
min 70 cm
12 cm
max 16 cm
max 16 cm
Figure 1: Distance to all sides min� 70 cm Figure 2: Distance
between antenna and
metal surface
exactly 12 cm
Figure 3:
Metal surface with
max� 16 cm x 16 cm
If the recommended distances are not observed, the antenna characteristics
change� The antenna needs to be re-evaluated in the respective installation�
The interference can be determined and minimised via the transmission
level, for example�