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Electronics and Communication Digital Communication Difficulty: Medium

A dual directional coupler is connected in a microwave reflectometer measurement setup. The reading of the power meter in the forward direction is 100 mw and in the reverse direction 4 mw. The VSWR is A unit impulse function δ(t) is defined by 1. δ(t) = 0 for all t except t = 0 2. $$\int_{ - \infty }^\infty {\delta \left( t \right)dt = 1} $$ The Fourier transform F(ω) of δ(t) is The modal noise occurs when uncorrected source frequency is? The relationship between the input x(t) and the output y(t) of a system is $$\frac{{{d^2}y}}{{d{t^2}}} = x\left( {t - 2} \right)u\left( {t - 2} \right) + \frac{{{d^2}x}}{{d{t^2}}}$$ The transfer function of the system is How many layers of material does a transistor have?