No. of Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

SECOND SEMESTER M.TECH DEGREE EXAMINATION, APRIL/MAY 2018
Branch:

Electronics and Communication Engineering

Stream(s) :
|. Microwave & Television Engineering
2. Telecommunication Engineering Course

Code & Name:
01 EC6204 Antenna Theory and Design

Answer any twofull questions from each pan

Limit answers to the required points.
Max. Marks: 60 Duration: 3 hours
PART A
1. 3. Using Lorentz condition show that V2A+k2A=—W 3
0. Explainomega match 3
©. Calculate the Directivity of an antenna with field pattern given by 3 g — jkr

2

E=Eg - COS "sin 0 56, 0 < 45 271

2. ഒ. Derive Expression for far filed pattern , and directivity of a half wave dipole 3
antenna

0. Explain the opamum design of Rhombic antenna 3

c. Derive expression for input impedance of a Folded dipole antenna 3

3. a. Derive expression for far filed pattern , radiation resistance and directivity of a 5
general circular loop antenna

b. Design an axial mode helical antenna for directivity 28dBi for operating at 4
60017112. Calculate the radiation resistance, HPBW,BWFN and bandwidth of the
designed antenna.

PART B

4. 2. Derive Halen's integral equation 3
b. Explain solution of Halen's integral equation using delta gap model. 3

c. Derive expression for far field pattern of an open ended wave guide 3