B.E-B.E Electronics and Communication Engineering Antennas and Wave Propagation (Sathyabama University, Chennai, Tamil Nadu-2011)
Monday, 19 August 2013 08:26Duraimani
(Established under section 3 of UGC Act,1956)
Course & Branch :B.E - P-ECE
Title of the Paper :Antennas and Wave Propagation Max. Marks:80
Sub. Code :SECX1029 (2010) Time : 3 Hours
Date :17/11/2011 Session :AN
PART - A (10 x 2 = 20)
Answer ALL the Questions
1. What is radiation resistance?
2. Define directivity of an antenna.
3. Give the principle of pattern multiplication.
4. What is the use of antenna arrays?
5. Mention the limitations of rhombic antenna.
6. Mention any two application of helical antenna.
7. What is fading? What are causes of it?
8. What is skip distance?
9. What are the methods of antenna gain measurement?
10. Define antenna noise.
PART – B (5 x 12 = 60)
Answer All the Questions
11. What is effective aperture of an antenna. Derive relation between effective aperture and Gain of an antenna
(or)
12. Derive the expression for far field of half-wave dipole antenna.
13. For an array of two point sources fed with currents of same magnitude but in phase quadrature,determine radiations pattern. Evaluate null directions and directions of maxima and draw the pattern .
(or)
14. Brief about parasitic array and binomial arrays.
15. Explain in detail about Rhombic antenna.
(or)
16. Brief about log periodic antenna.
17. Describe in detail the mechanism of reflection and refection of sky wave by ionosphere.
(or)
18. Brief about (a)fading of signals (b)maximum usable frequency.
19. What are methods used for measurement of gain of an antenna.
(or)
20. Mention relation between oblique and vertical incidence Transmission.
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