Low Pass Filters

TFilter.JPG

Pi_Filter.JPG

LPF_Eq.JPG
Zo = characteristic impedance in ohms
C = Capacitance in Farads
L = Inductance in Henries
Fc = Cutoff frequency in Hertz

High Pass Filters

 T-Hipass.JPG pi-high-pass.JPG
Where
Zo = characteristic impedance in ohms
C = Capacitance in Farads
L = Inductance in Henries
Fc = Cut off frequency in Hertz

Band Pass Filters

T_BandPassFilt.JPG

BandPassEq.JPG
Zo = characteristic impedance in ohms
C1 and C2 = Capacitance in Farads
L1 and L2 = Inductance in Henries
f1 and f2 = Cut off frequencies in Hertz

 

Band Stop Filters

BandStopFilter.JPG

A Band stop of Frequency Rejection Filter

Used to stop certain frequencies for example 2m where there is interference on a television set

 

A Braid Breaker

 

BraidBreaker.JPG

Used to insulate Television antennas where there are EMC Issues