Course Details

Subject {L-T-P / C} : EE6146 : Antenna Analysis and Synthesis { 3-0-0 / 3}

Subject Nature : Theory

Coordinator : Prof. K. Ratna Subhashini

Syllabus

Module1:

Antenna Basics: Introduction, Basic Antenna Parameters – Patterns, Beam Area,
Radiation Intensity, Beam Efficiency, Directivity-Gain-Resolution, Antenna Apertures,
Effective Height, Illustrative Problems. Fields from Oscillating Dipole, Field Zones, Front -
to-back Ratio, Antenna Theorems, Radiation, Retarded Potentials – Helmholtz Theorem
Thin Linear Wire Antennas – Radiation from Small Electric Dipole, Quarter Wave
Monopole and Half Wave Dipole – Current Distributions, Field Components, Radiated Power,
Radiation Resistance, Beam Width, Directivity, Effective Area and Effective Height, Natural
Current Distributions, Far Fields and Patterns of Thin Linear Centre-fed Antennas of Different
Lengths, Illustrative Problems. Loop Antennas - Introduction, Small Loop, Comparison of Far
Fields of Small Loop and Short Dipole, Radiation Resistances and Directivities of Small Loops
(Qualitative Treatment)
10 Hours

Module2:

Antenna Arrays: Point Sources – Definition, Patterns, arrays of 2 Isotropic Sources
- Different Cases, Principle of Pattern Multiplication, Uniform Linear Arrays – Broadside
Arrays, End fire Arrays, EFA with Increased Directivity, Derivation of their Characteristics
and Comparison, BSAs with Non-uniform Amplitude Distributions – General Considerations
and Binomial Arrays, Illustrative Problems.Antenna Measurements: Introduction, Concepts - Reciprocity, Near and Far Fields, Coordinate System, Sources of Errors. Patterns to be Measured, Directivity Measurement, Gain Measurements (by Comparison, Absolute and 3-Antenna Methods
13 Hours

Module3:
Module-3 VHF, UHF and Microwave Antennas - I : Arrays with Parasitic Elements, YagiUda Array, Folded Dipoles and their Characteristics, Helical Antennas – Helical Geometry,
Helix Modes, Practical Design Considerations for Mono filar Helical Antenna in Axial and
Normal Modes, Horn Antennas – Types, Fermat’s Principle, Optimum Horns, Design
Considerations of Pyramidal Horns, Illustrative Problems.

7 Hours

Module4:
Module 4:VHF, UHF and Microwave Antennas - II: Microstrip Antennas – Introduction,
Features, Advantages and Limitations, Rectangular Patch Antennas – Geometry and
Parameters, Characteristics of Microstrip Antennas. Reflector Antennas – Introduction, Flar Sheet and Corner Reflectors, Paraboloidal Reflectors – Geometry, Pattern Characteristics, Feed Methods, Reflector Types – Related Features, Illustrative Problems

10 Hours

Course Objectives

Course Outcomes

1)Explain the mechanism of radiation, distinguish between different antenna <br />characteristic parameters, establish their mathematical relations,Distinguish <br />between short dipoles, half-wave dipoles, quarter-wave mono poles and small <br />loops, configure their current distributions, <br /> <br />2. Characterize the antennas based on frequency, configure the geometry and <br />establish the radiation patterns of folded dipole, Yagi-Uda Antenna, Helical <br />Antennas, Horn Antennas, and to acquire the knowledge of their analysis, <br />design and development. <br /> <br />3. Analyze a microstrip rectangular patch antenna and a parabolic reflector <br />antenna, identify the requirements and relevant feed structure, carry out the <br />design and establish their patterns. <br /> <br />4. Carry out the Linear Array Analysis, estimate the array factor and <br />characteristics and sketch the pattern for 2-element array, N-element BSA, <br />EFA, modified EFA, Binomial Arrays.

Essential Reading

Supplementary Reading