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Previous Year Exam Questions for Antenna and wave Propagation - AWP of 2018 - bput by Bput Toppers

  • Antenna and wave Propagation - AWP
  • 2018
  • PYQ
  • Biju Patnaik University of Technology BPUT - BPUT
  • Electronics and Communication Engineering
  • B.Tech
  • 57 Offline Downloads
  • Uploaded 11 months ago
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Registration No : Total Number of Pages : 01 B.Tech. PEEC5304 6th Semester Back Examination 2017-18 ANTENNAS AND WAVE PROPAGATION BRANCH : ECE, ETC Time : 3 Hours Max Marks : 70 Q.CODE : C499 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Answer all parts of a question at a place. Q1 a) b) c) d) e) f) g) h) i) j) Answer the following questions: What is meant by Radiation Potential? How can we eliminate miner lobes? What is meant by duct propagation? What is Duality principle? State Huygens principle for Aperture antennas. Define FNBW and HPBW of aperture antenna. Point out the limitations of a microstrip patch antenna. Criticize the use of Baluns in antennas. Relate the Gain and Directivity of an antenna through proper expression. Compare end fire and broad side array. Q2 a) b) Derive the expression for radiation resistance of Hertzian dipole. A thin dipole is λ/15 long. If its loss resistance is 1.5 Ohm, find its efficiency. (5) (5) Q3 a) An antenna radiates power equally in all directions. The total power delivered to the radiator is 100 KW. Calculate the power density at distance of (i) 100m (ii) 1000m. Explain the following terms with respect to antenna a. Antenna temperature b. Polarization (5) What is Horn Antenna? Sketch the various types of Horn Antenna and explain its operation. Describe the principle of operation and applications of parabolic reflectors and derive its necessary equations. (5) Explain the structure and operation of Slot antenna. Also derive the expression of its input impedance. Explain the special features of reflector antenna and discuss on different types of feed used with neat diagram. (5) b) Q4 a) b) Q5 a) b) (2 x 10) (5) (5) (5) Q6 a) b) With suitable geometry describe the design of a log periodic dipole array. Explain the important features of ground wave propagation. (5) (5) Q7 a) b) Explain the electrical properties of Ionosphere Explain the effect of earth’s magnetic field. (5) (5) a) b) c) d) Write short answer on any TWO : Directivity measurement Gain measurement Uniqueness theorem lens antenna Q8 (5 x 2)

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