NXP Semiconductors PN5180 - 4.10 Secondary FW and EMVCo Loopback application

NXP Semiconductors
AN11740
PN5180 Antenna design
AN11740
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Application note
COMPANY PUBLIC
Rev. 1.1 — 19 June 2018
345311
36 of 62
c. Impedance first step
d. Impedance after adaptation
Fig 30. Impedance adaptation in the simulation (result)
a. Circuit first step
b. Circuit after adaptation
Fig 31. Impedance adaptation in the simulation (circuit)
With these adapted values of the antenna coil the last step of the final tuning can be
done:
La = L = 1.5µH
Ca = C
pa
= 1pF
Ra = R
Coil
= 2.5Ω