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Microwave Communication

Q1: Assertion (A): The condition of minimum distortion in a transmission line is L = RC/G. Reason (R): Line loading means addition of inductance to satisfy the condition L = RC/G.

A Both A and R are correct and R is correct explanation of A

B Both A and R are correct but R is not correct explanation of A

C A is correct but R is wrong

D A is wrong but R is correct

ANS:B - Both A and R are correct but R is not correct explanation of A

Oscillator circuits using vacuum tubes (triodes, pentodes) have the following limitations at very high frequencies (microwave region). The stray capacitances and inductances become important and affect the operation of the circuit. At low frequencies the transit time between cathode and anode is a small fraction of period of oscillation. However, at microwave frequencies this transit time becomes comparable to time period of oscillations.



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