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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 |
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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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