Antenna Tuning Details
www.ti.com
shows a Smith Chart simulation for R
PAR
value = 1.3 k
Ω
. This chart indicates theoretical parallel
and series capacitor values capacitor values to be 97 pF and 51 pF, respectively. This is less than a +2%
change from the calculated total cap value.
Figure 8. Smith Chart Simulation (R
PAR
= 1.3 k
Ω
)
shows a Smith Chart simulation for R
PAR
value = 680
Ω
(standard value). This chart indicates
theoretical parallel and series capacitor values to be 82 pF and 69 pF, respectively. This is less than a
+4% change from the calculated value.
Figure 9. Smith Chart Simulation (R
PAR
= 680
Ω
)
16
TRF7960TB HF RFID Reader Module
SLOU297 – October 2010
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