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IUH-F190-V1-*
Installation
5.3.2
Minimum Distances
When positioning the read/write head, please observe the minimum distances. The lateral
distance between the read/write head and metals or liquids should be at least 50 cm. The
distance between the read/write head and the ground should be at least 50 cm.
Figure 5.2
During simultaneous operation of several read/write heads, only one read/write head may ever
communicate with a tag at any given time. When arranging the read/write heads, make sure
that the measurement ranges do not overlap. You can enlarge or reduce the size of the
measurement range by changing the transmitting power. Determine the measurement range of
each read/write head at the mounting location.
Note!
During mounting, take into account how the read/write heads may cause interference with each
other. The further the transmission channels of the read/write heads are from each other, the
lower the risk of interference.
If you want to transmit with just one read/write head at any given time, use the multiplex mode
of the IDENTControl control interface. Multiplex operating mode allows chronologically
exclusive access to tags, and prevents mutual interference from read/write heads. For a precise
description, see the manual for your control interface.
5.3.3
Polarization
The polarization of the electromagnetic wave radiated by an antenna depends on the
electromagnetic field component and the position of the antenna. Polarization can be either
linear or circular. To achieve a UHF system's maximum detection range, the read/write head's
polarization must match the tag's polarization. Refer to the respective data sheet to find the
polarization of the tag.
Linear polarization: when an electromagnetic wave has linear polarization, the direction of
■
the vector of the electromagnetic field component is constant. Linear polarization can be
either vertical or horizontal. This characteristic depends on the position of the antenna.
Circular polarization: when an electromagnetic wave has circular polarization, the vector
■
of the electromagnetic field component rotates around an axis parallel to the direction of
emission. The rotation of the antenna around the transmission axis has no effect.
The IUH-F190-V1-FR* read/write head has circular polarization by default. You can switch the
polarization to horizontally linear polarization or vertically linear polarization via the
IDENTControl interface software. The linear polarization plane refers to the preferred mounting
direction with the cable connection mounted vertically downwards.
30
metal support
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