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1997 Course Radiation & Microwave Techniques

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Total No. of Questions :10] [Total No. of Pages : 2 P1587 [3764]-1025 B.E (E&TC) RADIATION & MICROWAVE TECHNIQUES (1997 Course) Time :3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Neat diagrams must be drawn wherever necessary. 3) Assume suitable data, if required. SECTION - I Q1) a) What are the advantages of waveguide over coaxial cable at microwave frequencies? [8] b) An air field rectangular waveguide of inside dimensions 7 3.5 cm operates in the dominant mode TE10 i) ii) b) Q3) a) b) Q4) a) Determine the phase velocity of wave in the guide at 3.5 GHz. iii) Q2) a) Find the cut-off frequency. Determine the guided wavelength at the same frequency. [8] Explain two hole directional coupler and its S parameters. [8] Explain four port circulator and S parameters. [8] With the help of diagram explain two cavity Klystron amplifier. [8] Explain bunching of electrons in reflex klystron. [8] With the help of VI characteristics explain operation of Gunn diode. [8] b) Explain LSA mode of operation of GUNN diode. Q5) Write short notes on : a) Waveguide bends. b) c) Waveguide isolator. Magnetron. [8] [18] P.T.O. SECTION - II Q6) a) b) Explain the principle of Cassegrain feeding mechanism used for parabolic reflector. [8] Explain following antenna parameters. i) ii) iii) iv) Q7) a) b) Q8) a) b) Q9) a) [8] With the help of Block diagram explain operation of pulsed Radar. [8] What is Doppler effect? How it is used in RADAR. [8] What is VSWR? How it is measured? [8] Explain the set-up for the measurement of impedance at microwave frequencies. [8] Give the applications of following devices : i) ii) iii) iv) b) Radiation pattern. HPBW. Near field and far field. Directivity and power gain. [8] PIN diode. Bolometer. Gunn diode. Lens antenna. Explain how a parametric amplifier works. [8] Q10)Write short notes on : a) Microwave power measurement. b) Industrial applications of microwave. c) Microstrip- antenna. [18] #### [3764]-1025 2

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