1.

A short circuited stub is shunt connected to a transmission line as shown in figure. If z0 = 50Ω, the admittance Y seen at the junction of the stub and transmission line is(a) (0.01 – j 0.02) mho (b) (0.02 – j 0.01) mho (c) (0.04 + j 0.02) mho (d) (0.02 + j 0) mho

Answer»

Correct option (a) (0.01 – j 0.02) mho

Explanation:

For both Transmission line and stub, z0 = 50Ω

For λ/2 line input impedance zil = zL

zil = zL = 100Ω

yil = 0.01mho

For short circuited stub input impedance

zi2 = jz0tan(βl)

= jz0tan(2πλ/λ8)

= jz0tan(π/4)

= jz0 = j50

Yi2 = 1/j50 = - j 0.02

Y = Yil + Yi2

= (0.01 - j 0.02) mho



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