Monday, January 30, 2023

Dr. A.P.J. Abdul Kalam University BE VI SEM (EC) Antenna & Wave Propagation [EC604] June 2021 Question Paper

Dr. A.P.J. Abdul Kalam University

Bachelor of Engineering

Sixth Semester Examination, June-2021

Antenna & Wave Propagation [EC604]

Branch: EC

Time: 3:00 Hrs Max Marks 70

Note: 1. Attempt any five questions out of eight.

2. All question carry equal marks.

Q.1 (a) What are different directional characteristic of dipole antenna.

(b)With the help of diagram explain the important features of different types of

space wave propagation of electromagnetic waves over long distance even

beyond the horizon.

Q.2 (a)Explain the radiation from a travelling wave on a wire.

(b)Derive the relation for magnetic and electric field components of an

alternating current elements.

Q.3 (a) What do you mean by horn antenna? Explain in detail.

(b) Explain Dolph-Chebyshev method of antenna array synthesis.

Q.4 (a) Explain traveling wave antenna in detail.

(b) Derive an expression for the power radiated by quarter wave monopole.

Q.5 (a) If the array factor of a line array has zero at

and the

elements are spaced at UA. Design the array.

(b) What do you mean by Ground Wave Propagation?

Q.6 (a) Write a short note on effect of earth on vertical patterns.

(b) Write a detail description on planer array.

Q.7 Discuss the significance of

(i) Retarded Potential

(ii) Radiation resistance

Q.8 Define the following.

(i) Effective length of transmitting and receiving antenna

(ii) Virtual height

(iii) Skip distance

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