The RF in RFID by Dobkin Daniel M

Author:Dobkin, Daniel M.
Language: eng
Format: epub
ISBN: 9780123948304
Publisher: Elsevier Science
Published: 2012-11-02T16:00:00+00:00

We can use the tools introduced in section (2) above to understand in a semi-quantitative way what antenna configurations make sense. For example, in the portal configuration of Figure 6.21, how many antennas are needed, and where should they be placed? We can make a first estimate by applying the procedure of Figure 6.5 to roughly sketch out the read zone, using a 6 dB beam width of about 120° obtained from the typical patch antenna pattern of Figure 6.16. In Figure 6.22 we show such an estimate overlaid on a 3-meter-square doorway, assuming the maximum read range in beam center is a conservative 3 meters. It’s apparent that a single pair of antennas, either both on one side or both at one elevation, will not cover the whole area of the doorway, but a pair of antennas on each side does a good job.

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