UNIVERSITY OF MADRAS
B.Sc. DEGREE COURSE IN ELECTRONICS SCIENCE
SEMESTER SYSTEM WITH CREDITS
(Effective from the Academic Year 2003-2004)

Semester V - Paper X - Antennas and Wave Propagation

Duration: 3 hrs
Maximum Marks: 100
Credits: 4

Unit-1

Fundamentals of Antenna : Antenna Action, Short Electric Doublet, Radiation from doublet Antenna, Thin linear antenna's, Current distribution on resonant and Non- resonant types, Effect of ground: image antenna, Field Strength at a point close to the antenna within the range of direct ray.

Unit-2

Antenna Characteristics: Total effective resistance of antenna, Efficiency of an antenna, Directive gain of antenna, Bandwidth, Beamwidth and Polarization, Ungrounded and Grounded antenna's, Effect of antenna height . Antenna couplers, Dipole arrays- Folded dipole and applications. Non resonant antenna's.

Unit-3

Types of Antennas : Microwave Antenna' s-Antennas with parabolic reflectors, Horn Antenna's, Lens Antenna's, Folded dipole -Yagi-uda Antenna, Helical Antenna, Discone antenna, Log-periodic Antenna, Loop antenna, Principle of Broad Band Antenna.

Unit-4

Wave Propagation : Electromagnetic radiation, Propagation of waves; Ground waves, Sky waves, Ionosphere and its effect on radio waves- Space waves, Tropospheric Scatter Propagation Extraterrestrial Communications, Skip Distance and Maximum Usable Frequency.

Unit-5/

Wave guides in Communication : Wave guides: Basic Concepts, Maxwell's Equation Guided waves between Parallel Planes, Attenuation in Parallel Plane guides, Rectangular wave guide; TM mode, TE mode, TE₁₀ modes-Boundary Conditions, Circular wave guides, TM & TE mode. Imposibility of TEM waves in wave guides. Transmission Line analogy for wave guides, TEM in coaxial line Comparison of wave guides and Coaxial Line, Resonators.

Books for study and reference