ON Semiconductor AND9670/D Quick Start Manual page 8

RFID Reader Antenna in H−Plane
The Figure 10 illustrates the RFID shield reading area with the attached whip antenna and measured in an ordinary
environment. The baseboard with the RFID shield is placed on the desk with the hight of table to ground about 78 cm and the
tag is placed in the horizontal polarized position whereby the height of antenna to the tag at reference position is 7 cm.
At the reference position, the RSSI is about 30. The tag is moved to the different position on the same place to characterize
the tag reading area. In this measurement setup, the optimum reading position is right side of the RFID shield where the
maximum reading distance up to 60 cm has been achieved. The second readng area in red with an omni−directional radiation
characteristics can be observed when the tag is in the vertical position to the earth ground plane.
AND9670/D
Figure 10. Top View of Tag Reading Area in H−Plane Position
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