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2003 Course Advanced Communication Engineering

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Total No. of Questions : 12] P1518 [Total No. of Pages : 4 [3864]-248 B.E. (Electronics) ADVANCED COMMUNICATION ENGINEERING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Explain microwave characteristics. [4] b) Discuss-Tee junctions, E-plane tees (series tee), H-plane tee (shunt tee), Magic Tees (Hybrid Tees), Hybrid Rings (Rat-Race circuits), waveguide corners, Bends and Twists. [14] OR Q2) a) Show that the TM01 and TM10 modes in a rectangular waveguide do not exist. [6] b) What is Q factor of cavity resonator? [4] c) Discuss in detail the types of cavity resonators. [8] Q3) a) A silicon n-p-n transistor operates in common-base mode at 300oK and has the following parameters : [10] Silicon intrinsic density : Acceptor density in base region : Donor density in emitter region : Hole lifetime : Electron lifetime : Cross section : Base width : Emitter length : ni = 1.5* 1010 cm 3 Na = 5* 1016 cm 3 Nd = 5* 1018 cm 3 p = 1 s n = 1 s A = 10 4 cm2 W = 10 3 cm LE = 10 2 cm P.T.O.

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