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AN3394 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN3394
Description  Antenna design and impedance matching guidelines for CR95HF multiprotocol contactless transceiver IC
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3394 Datasheet(HTML) 17 Page - STMicroelectronics

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AN3394
Read range estimate
Doc ID 018754 Rev 5
17/29
3.2
Read range calculation
Figure 16: Read range evolution shows the magnetic field strength radiated by the DEMO-
CR95HF-A demonstration board. Neglecting the effect of mutual coupling between the
CR95HF antenna and tag, it is possible to estimate the read range for a given tag.
As an example, the minimum operating fields for a M24LR64-R dual mode memory
mounted on the ANT1-M24LR-A reference board is around 50 mA/m.
Reporting this value on Figure 16: Read range evolution gives an estimated read range of
10 cm.
Figure 16.
Read range evolution



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