Capacitor - SARK 110 User Manual

Fra Self-resonant frequency of the antenna
Z(Fop) Z at operating frequency
Z(Fra) Z at resonant frequency
Rs Equivalent resistance at F = 1 MHz
La Equivalent inductance at F = 1 MHz
Rp Equivalent resistance at the self-resonant frequency
The antenna capacitance is calculated with the following equation:
1
=
Ca
π
× × ×
La 2 ( Fra
The series equivalent resistance of the antenna at the operating frequency Fop = 13.56 MHz is
calculated with the following equation:
π
× ×
2 ( Fop
= +
Ra Rs
Rp
The quality factor is calculated using the following equation:
π
× × ×
2 Fop La
=
Qa
Ra

14.2 Capacitor

This function determines the equivalent circuit model of capacitors. The measurement
procedure is as follows:
rd
Rev 1.2.6 October 3 , 2015
SARK- - - - 110 SARK
SARK SARK
2
)
×
2
La )
- 57 -
110
110 110
© Melchor Varela – EA4FRB 2011-2015
User's Manual