We will compute the ideal component values for a Butterworth Band Pass Filter
Fc = Center Frequency
Fw = Filter Width
Qu = Unload Q (42IF123 = 95) L = Coil μH
XL(50) = 50/(2π*Fc)μH | XL(150) = 150/(2π*Fc)μH. Choose XL near 100
Z(in-out) = 50Ω
q = 1.414, k = 0.707 const for a Butterworth shape.
ω=2π*Fc
Co = 10^6/(ω^2)*L
Qe = (q*FC*Qu)/((Fw*Qu)-(q*Fc))
Ce(pf) = ( (1/ω)*(1/(Sqrt(Z*Qe*L*ω)-(Z^2))) ) * 1000000
Cm = (Co*k*Fw)/Fc
Ct = C0-Cm-Ce
Download the BPF_Calculation in order to calculate all the HF Band’s components
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