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1997 Course Microwave Eng. (Elective II)

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Total No. of Questions : 10] P1455 [Total No. of Pages : 2 [3764]-1037 B.E. (E & TC) MICROWAVE ENGINEERING (1997 Course) (Elective - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) 2) Answer any three questions from each section. Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full makrs. 5) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What is Scattering Matrix ? List any two properties of S-matrix. b) Derive the S-matrix for a typical three port microwave device. [8] [8] Q2) a) Explain the working of a PIN diode . List the characteristics and applications. [8] b) Why an isolator is always used in a microwave test bench? Explain the [8] operation of an isolator made out of a three port circulator. Q3) a) With neat and necessary diagrams, explain how a Varactor Diode works. What are the applications? [8] b) What is the principle of operation of a Tunnel Diode? Explain its construction, characteristics and application. [8] Q4) a) Write detailed notes on MESFETs by explaining the construction, performance characteristics & their applications. [10] b) Compare : Parabolic Antenna Vs Horn Antenna at Microwave frequencies? [6] P.T.O.

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