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2003 Course Advanced Communication Eng.

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Total No. of Questions : 12] P999 [Total No. of Pages : 2 [3664]-218 B.E. (Electronics) ADVANCED COMMUNICATION ENGINEERING (404205) (2003 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) Figures to the right indicate full marks. SECTION - I Q1) a) Draw a neat sketch of E-plane tee, H-plane tee, and magic tee. Write S parameter matrix of each. [8] b) Draw a neat sketch of Directional Coupler . State the spacing between the centers of two holes of two hole directional coupler. Explain how the wave energy is propagating through it. [8] OR Q2) a) State and explain the principle of operation of two-cavity Klystron amplifier. [8] b) State and explain the principle of operation of helix traveling wave tubes (TWT). [8] Q3) a) What is Gunn Effect ? State the microwave generation and amplification using Gunn diode. [8] b) State the physical structures and principle of operation of microwave transistors. [8] OR Q4) a) State the characteristics of IMPATT Diodes. What do you understand [8] the term Negative resistance ? b) With the help of voltage and current waveforms explain the principle of operation of TRAPATT diodes. [8] P.T.O. Q5) a) Derive the Radar Range Equation. b) Write a short note on System Losses in radar. [9] [9] OR Q6) a) With the help of block diagram explain the working of Pulsed Radar System . [9] b) Write a short note on Plan-Position Indicator (PPI). [9] SECTION - II Q7) a) Derive the equation of Numerical Aperture . b) With the help of block diagram explain the OFC link. [8] [8] OR Q8) a) Write a short note on modes and types of optical fibers. [8] b) State and explain different types losses in optical fiber communication.[8] Q9) a) What is meant by cell splitting? How it is used to increase cellular system capacity? Explain with suitable example. [8] b) What is the difference between handoff and roaming? [8] OR Q10) a) What is the basic difference between CDMA and other mobile communication techniques? [8] b) State the advantages and disadvantages of DS-SS and FH-SS systems. [8] Q11) a) Explain the terms Synchronous Orbit , Polar Orbits , Inclined Orbits . [9] b) Draw the block diagram of earth station receiver. Sketch the Noise Temperature equivalent of the receiver. Derive the equation for system noise temperature. [9] OR Q12) a) Describe Satellite System Power Budget . [9] b) Discuss the main effects of the troposphere and the ionosphere with reference to signal propagation in satellite communication. [9] rrrr [3664]-218 -2-

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