APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

SECOND SEMESTER M.TECH DEGREE EXAMINATION, MAY 2016

Electronics and Communication Engineering

(Microwave and TV Engineering)

01506204: Antenna Theory and Design

Max. Marks: 60 Duration: 3 Hours
Answer any two questionsfronz each PART

Part A

a) An antenna with overall length | = 51, the observations are made at r 601.
(4.5)
Find the errors in phase and amplitude using far field approximation.

b) Derive the expression for power density, radiation resistance, and directivity of (4.5)

circular loop antenna.

Explain design procedure of gamma match. (9)

a) Derive the vector potential for an electric current source J. (4.5)

b) Derive radiated fields for a circular loop of constant current. (4.5)

Part B

Explain field equivalence principle and give the step to fonn an equivalent and aperture

problem. (9)

Design a Yagi-Uda array with a directivity of 9.2 dB at % = 50 MHz, The desired diameter

of the parasitic elements is 2.54 cm and of the metal

5. lcm. Find the element spacing, lengths and total array (9)
supporting boom length.