Network Analysis and Synthesis, 1st Edition by Pearson

590 Network Analysis and Synthesis

13.4.1 Propagation Constant (f )

For any two-port network terminated by characteristic

impedance Z

0

, as shown in Figure 13.6, we can write the

following:

I

I

V

V

e

1

22

==

1

g

g ==

loglog

e

1

e

I

IV

2

1

2

V

where g is known as propagation constant. Propagation

constant determines the propagation performance of any two-port network.

Moreover,

ga b=+

j (13.4)

where a is real part of g and is known as attenuation constant of the filter, and b is imaginary

part of g and is known as phase constant.

13.4.2 Attenuation Constant

Whenever a signal passes through a passive network/filter, it gets attenuated, because passive

components like capacitors ...