
Filters and Attenuators 593
p-Section Ladder Network
It is formed by connecting several sections of p-networks in cascade, as shown in Figure 13.10.
Z
1
Z
1
Z
1
Z
1
2Z
2
2Z
2
2Z
2
1
2Z
2
2Z
2
1
2Z
2Z
2
Z
2
2Z
2
=
2Z
2
2Z
2
Z
2
Figure 13.10 p -Section Ladder Network
13.6 ANALYSIS OF FILTER NETWORKS
In this section, we will explain how the basic parameters of T- and p-networks are determined.
13.6.1 Symmetrical T-network
We know that the basic parameters of a filter network are its
characteristic impedance, propagation constant, attenuation
constant and phase shift constant. These are calculated as
follows.
Characteristic Impedance (Z
0
)
If a two-port network is symmetrical, the image ...