PN544 Antenna Design Guide (NFC匹配计算)

PN544 Antenna Design Guide (NFC匹配计算)
PN544 Antenna Design Guide (NFC匹配计算)

value unit annotation f res Reader =1.356E+07[Hz]Reader Mode target resonance frequency to be filled out omega =8.520E+07[s -1]

fixed/calculated values

L 0 =5.600E-07[H]EMC inductance

f r0 =1.550E+07[Hz]EMC Filter frequency C 0 calculated =1.883E-10[F]C 0 =1.800E-10[F]chosen value for C0

f res EMC =1.585E+07[Hz]EMC Filter frequency 180+56R match =8.000E+01[Ω]Target impedance of final antenna tuning

R tr =1.785E+02

X tr =-5.236E+01

Antenna:linear view unit annotation

L a =1.260E-06[H]antenna inductance measured at 1MHz R s =1.200E+00[Ω]antenna serial resistance measured at

1MHz

R p =1.329E+03[Ω]antenna parallel resistance measured at

self resonance frequency of the antenna

f ra =4.166E+07[Hz]self resonance frequency of the antenna Rp (13.56MHz) = 2.329E+03[Ω]parallel resistance calculated at 13.56MHz based on self resonance

frequency measurement

R a =6.147[Ω]serial and parallel resistor of antenna at

13.56MHz

C a =1.158E-11[F]parallel capacitance of antenna Q a =17.463calculated quality factor of antenna Target Q =30Fill out target quality factor of antenna

R Q =-1.284[Ω]Resistance needed for Target Q

uncheck if no external damping resistor

is required

S t e p 3Antenna:linear view unit annotation

L a =1.809E-06[H]antenna inductance measured at 1MHz R s =1.410E+00[Ω]antenna serial resistance measured at 1MHz

R p =2.461E+03[Ω]antenna parallel resistance measured at self resonance frequency of the antenna f ra =4.136E+07[Hz]self resonance frequency of the antenna Rp (13.56MHz) = 4.298E+03parallel resistance calculated at

13.56MHz based on self resonance

frequency measurement

R a =6.938[Ω]serial and parallel resistor of antenna at 13.56MHz

C a =8.186E-12[F]parallel capacitance of antenna Q a =22.216calculated quality factor of antenna including damping resistors R Q

Antenna:linear view unit annotation L pa =1.809E-06[H]

C pa =8.186E-12[F]

R pa =3.424E+03[Ω]

Q pa =22.216

Matching Circuit:value unit annotation C1 = 3.218E-11[F]

C2 = 1.059E-10[F]solder C2 at place C2A Matching Circuit:value unit annotation C1 = 3.218E-11[F]final values found

C2 = 1.059E-10[F]final values found

Matching Circuit:value unit annotation Card mode target

resonance

frequency 1.600E+07[Hz]choose card mode target resonance frequency between 14.5MHz and 16MHz Cshift 3.080E-11[F]total parallel capacitance for the reader

mode needs to be 3.0803823751914E-

11F higher than in card mode

C2B 6.161E-11[F]calculated value for C2B (card mode

tuning, frequency shift)

C2A 4.428E-11[F]calculated value for C2A C2B impedance at

13.56MHz =190.51[Ω]resistance to be considered during field

current extraction (PbtF)

Matching Circuit:value unit annotation C2B 1.000E-11[F]

C2A 1.900E-11[F]

approximation of C2B

impedance at 13.56MHz

=1,173.71[Ω]resistance to be considered during field

current extraction (PbtF)I n f

o

r m a t i

o n I n f

o r m a

t i o n S t e p

6When Simulating with RFSim99, take care the program is correctly

installed and RFSim working path is set first

color explanation 1st Iteration: Measurement of Antenna parameter L a , R s , R p,f ra choose an appropriate value for R

Q and perform a 2nd antenna measurement for L a , R s , R p ,f ra

2nd Iteration: Measurement of Antenna parameter L a , R s , R p,f ra Parallel equivalent antenna circuit

S t e p

7S t

e p 8PN544 Matching Calculations

Calculated Matching Components Fill out real values for C1 and C2 after finetuning Connection of ANT pins / split C2

Fill out real values for C2A and C2B after finetuning

S t

e p 1S t e p

2S t

e p 4check to use Rq

C:\Data\NXP_NFC\wayne wu\RF\RFsim99\RFSim99.exe

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