Punjab Technical University 2002 B.E Civil Engineering ANTENNA AND WAVE PROPAGATION - Question Paper

ANTENNA AND WAVE PROPAGATION (B.Tech fifth Semester,2002)

NOTE:- This paper consist of 3 parts. part A is compulsory. Do any 4 ques. from
part B and any 2 ques. from part C

Section-A Marks : 20

1(a) What is an oscillating electric dipole ?
(b) discuss Far Field approximation to antenna field trend.
(c) What is 2 element array ?
(d) What is antenna impedence ?
(e) discuss directivity and resolution.
(f) What is continuous aperture distribution ?
(g) discuss the surface waves.
(h) What is plane earth reflection ?
(i) elaborate regular variations in ionospheric waves ?
(j) What is skip distance ?

Section-B Marks:5 every

2. discuss radiation from a dipole.
3. discuss the noise temperature of an antenna.
4. discuss the radiation through a conduction screen.
5. discuss Broad Side Arrays. Write down expression for its far field.
6. What is Duct Propagation ?

Section-C Marks : 10 every

7. find an expression for input impedence of an antenna using transmission line analogy.
8. Obatin the expression for space wave trend for the horizontal dipole and draw the vertical radiation trend.
9. Expalin the experimental method to determine critical frequency and virtual hieght. find expressions for maximum usable frequency and the skip distance.

Earning:   Approval pending.