Lit Number: 11-06-21-068
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Figure 29. Opposing Antennas (In-phase)
If standard antennas are used, they are connected in parallel and appear as a single
13.5 µH antenna. This means they have to be used with the Remote Antenna RFM.
A better approach is to make two antennas that are 54 µH (double inductance). When
these antennas are connected in parallel, they appear as 27 µH inductance and can
be used with standard RF module.
Figure 30. Two 54 µH Antennas Connected in Parallel (In-Phase)
Note:
Do not make your double inductance antennas too large. As both
loops are connected to the same reader, they pick up twice the
electrical noise. Also if more than one tag is in the field at once
i.e. at each antenna, you may not get a response.
5.3 Opposing
Antennas
(out-of-phase)
When two double inductance antennas are connected to the same RF Module but out-
of-phase (swap over one pair of connectors, or turn one antenna 180º), the RF field is
changed.
Summary of Contents for 2000 LF Series
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