Microwave and Wireless Communications Technology

Step-Function Response of a Transmission Line 55

0

!

V

I L

L L

2

(A)

V

,,,

0

To

i

L

2

(B)

T1

I >v

V

v To,

2

0

(C)

1

L

Figure 4-4 Propagation of an

impulse along a transmission

line.

4-3.1

v (Fig. 4-5C). When the pulse hits the wall (Fig. 4-5D), it is reflected (Fig. 4-5E) and

propagates back down the rope toward the free end (Fig. 4-5F).

If a second pulse is propagated down the line before the first pulse dies out,

there will be two pulses on the line at the same time (Fig. 4-6A). When the two

pulses interfere, the resultant will be the algebraic sum of the two. If a pulse train

is applied to the line, the interference ...