User's Manual

© Copyright 2004-2006 RF Code, Inc. All rights reserved. UM-P2900-R101-20060404.
No copying of this material is allowed without prior written permission. Page 7 of 24.
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USER MANUAL – Mantis™ II 433.92 MHz Reader
Antennas – Positioning
Figure 2.3 – Standard ¼-wave helical antennae shown in various positions.
Each antenna post supplies an RF signal to the two parallel radio receivers in
the Mantis™ II 433.92 MHz Reader. Antenna input impedance is 50 ohms
nominal.
Both the type of antennas used and the Reader range setting determine the
effective read range. The normal Reader-range features are defined using
¼-wave helical antennas.
These antennas are appropriate for most Reader applications. Optional
antennas that offer diverse receiving properties or extend the range of the
Reader are available for the Mantis™ II 433.92 MHz Reader. Contact your
Mantis™ II 433.92 MHz Reader distributor for more information.
The Mantis™ II 433.92 MHz Reader has two receiver channels that can
operate independently or jointly to provide Tag signal diversity reception.
The Reader can operate with one antenna on either antenna post, but the
benefit of receiver diversity reception is obtained with both antennas
attached.
Depending on the location and orientation of the tags, the signal path to the
Reader may vary for each Tag. This may allow only one antenna to receive
the signal.