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Question

All transmission line section in figure, have a characteristic impedance R0+j0. The input imprdance Zin equals









A
32R0
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B
23R0
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C
R0
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D
2R0
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Solution

The correct option is C R0
Ans : (b)

For λ/4 line

Zin1=Z201ZL1=R20R0/2=2R0

For λ/2 line

Zin2=ZL2=2R0

Forλ/8line

ZL=(Zin1)||(Zin2)

ZL=(2R0)||(2R0)

ZL=R0

Forλ/8line

Zin=Z0[ZL+jZ0Z0+jZL]

Zin=R0[R0+jR0R0+jR0]=R0

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