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AN3394 Scheda tecnica(PDF) 13 Page - STMicroelectronics

Il numero della parte AN3394
Spiegazioni elettronici  Antenna design and impedance matching guidelines for CR95HF multiprotocol contactless transceiver IC
PDF  29 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3394 Scheda tecnica(HTML) 13 Page - STMicroelectronics

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AN3394
Application to DEMO-CR95HF-A demonstration board
Doc ID 018754 Rev 5
13/29
2
Application to DEMO-CR95HF-A demonstration
board
This section describes in detail the numerical application corresponding to the DEMO-
CR95HF-A demonstration board.
If your application requires a different antenna, use the DEMO-CR95HF-A Gerber files
available for http://ww.st.com to design your own antenna. Guidelines on how to design an
antenna can be found in Section 4: Main criteria for key antenna design.
2.1
Antenna parameters
This section describes part 3 of circuit shown in Figure 9: CR95HF parallel matching circuit
intermediate simplification.
2.1.1
Antenna serial equivalent model
Figure 11.
Antenna parameters without EMI filter
Where values from Equation (I.4) give:
RA =O.6 Ω and LA = 36.6* ω.
As a result, LA = 430 nH.
The capacitance is included in the inductance presented above. As a result:
Equation (II.1)
Where
QA:
Antenna quality factor, defined with antenna parameter.
IM(x):
Imaginary part of the complex number x.
RE(x): Real part of the complex number x.
ω:
Resonance pulsation [rad/s].
ω = 2π f with f = 13.56 MHz.
Q
A
IM Z
load
()
[]
RE Z
load
()
---------------------------------
ω L
A
×
R
A
-----------------
61 1
,
=
=
=



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