## Antenna and Wave Propagation by Mr. V. Rama Krishna Sharma M.Tech, (Ph. D) The course gives an awareness of antenna parameter considerations and analysis of the designed antenna with field evaluations for various conditions. Code : AWPJHECE31 Recommended For : JNTU B. Tech ECE 3rd Year 1st Semester

#### After Learning this subject,you should be able to

• Aware of parameter considerations viz. antenna efficiency, beam efficiency, radiation resistance etc. in the design of an antenna.
• Capable to analyze the designed antenna and field evaluation under various conditions and formulate the electric as well as the magnetic fields Equation set for Far field and near field conditions.
• Understand the Array system of different antennas and field analysis under application of different currents to the individual antenna elements
• Understand the design issues, operation of fundamental antennas like Yagi-Uda, Horn antennas and helical structure and also their operation methodology in practice.
• Design a lens structure and also the bench step for antenna parameter measurement of testing for their effectiveness.
• Knowledge about the means of propagation of Electromagnetic wave i.e. free space propagation and also about frequency dependent layer selection, its respective issues for an effective transmission of information in the form of EM wave to a remote location and related issues.

## Curriculum 12:16:05   units   |   10

• 0:26:13

UNIT 1
AWP introduction: Subject Introduction- part 1, Subject Introduction- part 2, Subject Introduction- part 3, Unit Introduction

• 1:10:50

UNIT 1.1
Antenna Basics: Introduction, Radition Pattern, Beam Area, Radiation Intensity, Beam Effeciency, Directivity Gain-Resolution, Antenna Apertures, Effective Height, Fields from Oscillating Dipole & Front to back Ratio, Field Zones, Antenna Theorems & Radiation, Illustrative Problems & Retarded Potentials - Helmholtz Theorem- part 1, Illustrative Problems & Retarded Potentials - Helmholtz Theorem- part 2

• 1:22:06

UNIT 1.2
Thin Linear Wire Antennas: Introduction, Electric Dipole & its Current Distribution, Quarter Wave Monopole & Current Distribution, Half Wave Dipole & Current Distribution, Field Components- part 1, Field Components- part 2, Radiation Resistance, Beamwidth, Directivity effective area & height, Natural Current Distributions of TLWA, Far Fields & Patterns of TLCFA of different lengths, Illustrative Problems, Loop Antennas - Introduction, Comparision of Far Fields of Small loop and short dipole, Radiation Resistances & Directivities of Small & Large Loop (Qualitative Treatment)

• 1:43:21

UNIT 2
VHF, UHF & Microwave Antennas - 1: Arrays with parasitic elements, Yagi-Uda Array - part 1, Yagi-Uda Array - part 2, Yagi-Uda Array - part 3, Folded Dipoles & their Characteristics, Helical Antenna & Helical Geometry, Helix Modes, Practical Design Considerations for Monofilar Helical Antenna in Axial Modes - part 1, Normal Modes, Horn Antennas & Types - part 1, Horn Antennas & Types - part 2, Fermat's Principle, Optimum Horns & Design Considerations of Pyramidal Horns, Illustrative Problems 1, Illustrative Problems 2

• 1:19:44

UNIT 3.1
VHF, UHF & Microwave Antennas - 2: Microstrip Antennas - Introduction, Features, Advantages & Limitations, Rectangular Patch Antennas, Characteristics of Microstrip Antennas, Impact of Different Parameters on Characteristics, Reflector Antennas - Introduction - part 1, Reflector Antennas - Introduction - part 2, Reflector Antennas - Introduction - part 3, Flar Sheet & Corner Reflectors, Paraboloidal Reflectors & Geometry, Pattern Characteristics, Reflector Types - Related Features

• 0:20:53

UNIT 3.2
Lens Antennas: Introduction, Geometry of Non-Metallic Dielectric Lenses, Zoning, Tolerances, Applications & Illustrative Problems

• 1:28:28

UNIT 4.1.1
Antenna Arrays: Point Sources - Definition, Patterns, Arrays of 2 Isotropic Sources & Different Cases - part 1, Arrays of 2 Isotropic Sources & Different Cases - part 2, Principles of Pattern Multiplication, Uniform Linear Arrays, Broadside Arrays, Endfire Arrays, EFA with Increased Directivity, Derivation of their Characteristics & Comparision, BSAs with Non-uniform Amplitude Distributions & General Considerations & Binomial Arrays, Illustrative Problems

• 1:08:16

UNIT 4.2
Antenna Measurements: Introduction & Concepts & Reciprocity & Near & Far Fields, Coordinate System, Sources of Errors, Patterns to be Measured, Pattern Measurement Arrangement, Directivity Measurement, Gain Measurements (By Comparision, Absolute & 3-Antenna Methods)- part 1, Gain Measurements (By Comparision, Absolute & 3-Antenna Methods)- part 2

• 1:17:40

UNIT 5.1
Wave Propagation - 1: Categorizations & General Classifications, Different Modes of Wave Propagation, Ray & Mode Concepts, Ground Wave Propagation (Qualitative Treatment) - Introduction, Waves Tilt, Curved Earth Reflections - part 1, Curved Earth Reflections - part 2, Space Wave Propagation - Introduction, Field Strength Variation with Distance & Height, Effect of Earth's Curvature, Absorption, Super Refraction & M-Curves & Duct Propagation - part 1, Super Refraction & M-Curves & Duct Propagation - part 2, Scattering Phenomena & Tropospheric Propagation

• 1:17:37

UNIT 5.2
Wave Propagation - 2: Structure of Ionosphere, Refraction & Reflection of Sky Waves by Ionosphere - part 1, Refraction & Reflection of Sky Waves by Ionosphere - part 2, Refraction & Reflection of Sky Waves by Ionosphere - part 3, Critical Frequency - CF & Maximum Usable Frequency - MUF - part 1, Critical Frequency - CF & Maximum Usable Frequency - MUF - part 2, Optimum Working Frequency - OF, Lowest Usable Frequency - LUF, Multi-hop Propagation