PTU B.Tech ECE 4th Semester May 2019 57595 ELECTROMAGNETICS AND ANTENNAS Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 4th Semester Electronic and Communication Engineering (ECE)

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ECE)/(ETE) (2011 Onwards)/
(Electronics Engg.) (2012 Onwards)
(Sem.?4)
ELECTROMAGNETICS AND ANTENNAS
Subject Code : BTEC-403
M.Code : 57595
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
1.
Answer briefly :

a) Write the wave equation for free space propagation.

b) What is waveguide? What is its importance and applications?

c) Differentiate between ordinary end fire array and Hansen-wood yard end-fire

antenna.

d) Define Babinet's principle.

e) What is the significance of Poynting theorem?

f) What is propagation constant?

g) Define Retarded Vector and scalar potential.

h) Define Radiation Pattern of an antenna.

i) Define Maximum Usable Frequency.

j) Define Skip Distance.
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SECTION-B
2.
Explain and derive the general solution of transmission line terminated with any load
impedance.
3.
Derive the expression for direction of pattern maxima and minima for array n isotropic
sources of equal amplitude and spacing (for broadside).
4.
What is distortion less transmission line? Derive the expression for the distortion less
condition.
5.
Describe the mapping of constant resistance and constant reactance circle on reflection
coefficient plane.
6.
Derive relation between E and H in uniform plane wave propagation.

SECTION-C
7.
Explain the concept of polarisation. What are the conditions for different types of
polarisation?
8.
Explain the structure of atmosphere. Discuss the range of space wave propagation.
9.
Discuss the construction and operation of paraboloid reflector antenna.






NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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