Page 244 - Analog and Digital Filter Design
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Impedance Matching Networks 24 1
A = X3' .(Xl' .X2+X2'.XI)
B = (Xl.X2 + X22 + X2.X3 + X1.X3 + X2X3 + X32).X1.R, 2
A+B
I=sgn
((Xl+X2).X3)' +((Xl+X2 +X3).RL)'
The reflection coefficient, and hence the VSWR, can be found using the same
equations as for the type A network.
Exercises
8. I Power splitters can be built using three resistors connected in either
star or delta configuration. Which configuration is the most reliable?
What is the insertion loss between the source and each load?
8.2 What is the loss between a source and load for transformer-coupled
power splitters? Why is this different from the loss in resistive splitters?
8.3 In a diplexer, why do the filter sections have to present high impedance
in their stopband?
8.4 In a diplexer circuit built using lowpass and highpass filter combina-
tions, why must the same cutoff frequency (-3 dB point) be used for
each filter section?
