16.9 CHARACTERISTIC IMPEDANCE AND PROPAGATION CONSTANT OF
SYMMETRIC T AND PI NETWORKS UNDER SINUSOIDAL STEADY-STATE
Symmetric reactive T- and Π-networks are used in designing passive filters. This section
discusses the characteristic impedance and propagation constant of T- and Π-networks to set
the background for the discussion on passive filters in the subsequent sections.
The standard T- and Π-networks employing the same underlying phasor impedances
Z
1
and Z
2
are shown in Fig. 16.9-1(a) and (b).
Consider the T-network first. Let Z
oT
be the characteristic impedance of the T-network.
(16.9-1)
(see Example 16.7-1)
Let
γ
be the propagation constant of T ...
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