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Pune University - Sem - II : Applied Electromagnetics, RF, April 2010 (Old Course)

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Total No. of Questions : 5] [Total No. of Pages : 2 P1162 [3729]- 21 M.Sc. (Sem. - II) ELECTRONIC SCIENCE EL2 UT 03 : Applied Electromagnetics, RF, Microwave (Old Pattern) Time : 3 Hours] Instructions to the candidates: 1) All questions are compulsory. 2) Use of non-programmable calculator is allowed. 3) Draw a neat diagram wherever necessary. Q1) Solve any two : [Max. Marks : 80 [2 8 = 16] a) State Helmoltz equation. Explain how it can be solved to determine electromagnetic wave propagation. b) With the help of neat diagram explain the principle of tunnel diode and discuss its I-V characteristics. c) An X-band pulsed magnetron has the following operating parameters. Anode voltage Vo = 5.5kV, Beam current Io = 4.5Amp, operating frequency f = g GHz, Resonator conductance Gr = 2 10 4 mho, loaded conductance Gl = 2.5 10 5 mho, vane capacitance, C = 2.5 pF. Duty cycle DC = 0.002, power loss : P loss = 18.50kW. Compute : i) Angular resonant frequency. ii) Unloaded quality factor. iii) Loaded quality factor. iv) External quality factor. Q2) Solve any two : [2 8 = 16] a) With the help of neat diagrams explain parabolic-reflector antenna, dielectric lens antennas and metal lens antennas in detail. b) What is axon? Explain with the help of a typical neuron showing details. Draw a equivalent circuit of oxan transmission and explain it in detail. c) Starting from Maxwell s equation, determine the electric and magnetic wave equations. P.T.O. Q3) Write a short note on any four : [4 4 = 16] a) Q factor of cavity resonator. b) Smith chart. c) Power loss in rectangular wave guide. d) Materials for monolithic microwave integrated circuits. e) Characteristics impedance of microstripline. Q4) Solve any four : [4 4 = 16] a) Explain electromagnetic wave propagation through an optical wave guide. b) What are wave guide Tees? Explain series-Tee in short. c) Discuss modes of operation of n-channel MOSFET. d) What is meant by electromagnetic interference? How it arises? Explain with the help of any one example. e) State and prove poynting vector theorem. Q5) Solve any four : [4 4 = 16] a) Write a short note on RF heating. b) What is magnetic navigation at birds explain in short. c) Starting with Maxwell s equation, obtain an expression for intrinsic impedance of a medium. Determine the power radiated by 10cm dipole antenna operated at 50Hz with an average current of 5mA. d) e) How microwave solid state devices are classified? List the various devices. xxxx [3729]-21 2

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Additional Info : M.Sc. - I Electronic Science, EL1 UT 03 : Applied Electromagnetics, RF & Microwave (Old Course) (Semister - II), Pune University
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