NXP Semiconductors
AN11740
PN5180 Antenna design
AN11740
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Application note
COMPANY PUBLIC
Rev. 1.1 — 19 June 2018
345311
35 of 62
(1) This matching does not meet the requirements. It must be corrected and retuned.
Fig 29. Measurement result of first assembly
4.2.1.7 Impedance adaptation in simulation
The easiest and fastest way to (fine) tune the antenna is to first of all adapt the simulation
in such a way that it shows the same result as the reality. The parameters of the antenna
coil are the parameters to be changed, since these parameters are not measured (or
estimated) correctly.
So with the values of L, C
pa
, and R
Coil
the simulation is tuned from Fig 29c to Fig 29d. The
changed values can be seen in Fig 30b.
