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AN2866 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN2866
Description  RFID tags extract all of their power
PDF  24 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2866 Datasheet(HTML) 11 Page - STMicroelectronics

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AN2866
Designing the antenna coil
11/24
Figure 9.
Square coils
The software tool (antenne.exe) uses the Grover method (see Equation 1: : Grover method)
to calculate the inductance of rectangular planar antennas. Figure 10 shows the software
user interface.
The software gives a good approximation of the antenna inductance Lant. This can be
checked by comparing the software results to measurements of the inductance of a real
antenna on an impedance meter.
Equation 1: Grover method
, where:
●
M is the mutual inductance between each of the antenna segments
●
L0 is as defined in Equation 2
Equation 2:
, where:
●
s is the number of segments
●
Lj is the self inductance of each segment
Table 2.
K1 & K2 values according to layout
Layout
K1
K2
Square
2.34
2.75
Hexagonal
2.33
3.82
Octagonal
2.25
3.55
L
ant
L
0
M
∑
+
=
L
0
L
j
j1
=
s
∑
=



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