A 100-Ω lossless transmission line is connected to a second line of 40-Ω impedance, whose length is λ/4. The other end of the short line is terminated by a 25-Ω resistor. A sinusoidal wave (of frequency f) having 50 W average power is incident from the 100-Ω line. (a) Evaluate the input impedance to the quarter-wave line. (b) Determine the steady-state power that is dissipated by the resistor. (c) Now suppose that the operating frequency is lowered to one-half its original value. Determine the new input impedance, Z'in, for this case. (d) For the new frequency, calculate the power in watts that returns to the input end of the line after reflection.
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