No. of Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER M. TECH DEGREE EXAMINATION, DECEMBER 2017

(Electronics & Communication Engineering)
(Microwave & Television Engineering)
(Telecommunication Engineering)

೦1೯೮6204 Antenna Theory and Design

Answer any twofull questions from each part.
Limit answers to the required points.

Max. Marks: 60 Duration: 3 hours
PARTA

1. 2. Derive Helmholtz equation in terms of magnetic vector potential. 4.5

b. Explain the axial mode and normal mode Of operation of a helical antenna. 4.5

2. 2. Explain the steps involved in the design of a T - Match Circuit. 4.5
b. With the help of neat sketches explain the working of a Rhombic Antenna. 4.5

List its important features.

3. 2. Derive expressions for the fields radiated by a circular loop antenna. 9
PART B
4. 2. Derive Hallen's Integral Equation. Discuss about the importance of Hallen's 9
equation.

5. ദ. Explain the Field Equivalence Principle in detail. 6
0. List the Mportantfeatures of a Yagi-Uda Antenna. 3

6. 2. Discuss about any two feeding techniques for Microstrip antenna, 4.5

b. Design a rectangular Microstrip antenna resonating at 2 GHz. The antenna 4.5 uses a
substrate with a dielecfric constant of 10.2 and the height of the substrate is 0.3 cm.
PART C

7. 2. Explain the working of Lens Antenna. What do mean by zoning in Lens 6
Antenna?

b. Discuss about the Frequency Sampling Technique for Array Design. 6