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BIS U Basic Manual
7
Component Properties and System Characteristics
7.3 Data Carrier
Antenna Shapes
18
Antenna designs are predominantly limited to shapes that are very similar to a dipole because
the power is drawn exclusively from the electric field in the far field. Data carriers that incorporate
slot, patch or microstrip resonator antennas are exceptions to the rule because they can be
mounted directly onto metal surfaces. This document does not explore these data carriers in
further detail.
Data carriers with antennas similar to a dipole are available in a wide range of shapes and sizes,
for example:
Source: Alien Technologies
Figure 9:
Data carriers with different antenna designs
The use of RF loop antennas with additional radiating elements (wave trap dipoles) achieve a
reduction in the overall size and make data carriers suitable for use in the near field.
Source: UPM Raflatac
Source: Alien Technologies
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