# Antennas _ Wave Propagation

Document Sample

```					                P. S. C. M. R. COLLEGE OF ENGINEERING & TECHNOLOGY
Affiliated to JNTU, Kakinada & Approved by AICTE New Delhi
Department of Electronics and Communication Engineering

Name of the Faculty         : S. PRADEEP KUMAR
Name of the Subject         : ANTENNAS AND WAVE PROPAGATION
YEAR/BRANCH/SEM             : III Year B.Tech. E.C.E (I SEM)
Academic Year               : 2012 – 13

UNIT                               NAME OF THE TOPIC                                    PERIODS
ANTENNA FUNDAMENTALS                                                            REQUIRED
9
Introduction                                                                       2
Radiation Mechanism – single wire, 2 wire, dipoles                                 1
Current Distribution on a thin wire antenna                                        1
Antenna Parameters - Radiation Patterns, Patterns in Principal Planes              1
I
Main Lobe and Side Lobes, Beamwidths, Beam Area                                    1
Directivty, Gain and Resolution, Antenna Apertures                                 1
Aperture Efficiency, Effective Hight. Related Problems                             1
THIN LINEAR WIRE ANTENNAS                                                          9
Retarded Potentials, Radiation from Small Electric Dipole                          2
Quarterwave Monopole and Halfwave Dipole – Current Distributions, Evaluation
of Field Components                                                                1
II    and Effective Hight
Natural current distributions, fields and patterns of Thin Linear Center-fed       1
Antennas of different at a point which is not current maximum.                     1
Antenna Theorems – Applicability and Proofs for equivalence of directional         1
characteristics Small Loops - Field Components, Comparison of far fields of
Loop Antennas:                                                                     1
small loop and short dipoledipole, D and Rr relations for small loops
Concept of short magnetic                                                          1
ANTENNA ARRAYS                                                                     9
2 element arrays – different cases, Principle of Pattern Multiplication            2
N element Uniform Linear Arrays – Broadside, Endfire Arrays                        1
EFA with Increased Directivity,                                                    1
III   Derivation of their characteristics and comparison                                 1
Concept of Scanning Arrays                                                         1
Directivity Relations (no derivations). Related Problems                           1
Binomial Arrays, Effects of Uniform and Non uniform Amplitude Distributions        1
Design Relations                                                                   1
Introduction, Travelling wave radiators – basic concepts                           2
Longwire antennas – field strength calculations and patterns                       2
V-antennas, Rhombic Antennas and Design Relations                                  1
IV
Broadband Antennas: Helical Antennas – Significance                                1
Geometry, basic properties                                                         1
Design considerations for monofilar helical antennas in Axial Mode and Normal
Modes (Qualitative Treatment)                                                      2
P. S. C. M. R. COLLEGE OF ENGINEERING & TECHNOLOGY
Affiliated to JNTU, Kakinada & Approved by AICTE New Delhi
Department of Electronics and Communication Engineering

VHF, UHF AND MICROWAVE ANTENNAS - I                                             9
Arrays with Parasitic Elements, Yagi - Uda Arrays                               2
Folded Dipoles & their characteristics                                          2
Reflector Antennas : Flat Sheet and Corner Reflectors                           1
V
Paraboloidal Reflectors – Geometry, characteristics                             1
types of feeds, F/D Ratio, Spill Over                                           1
Back Lobes, Aperture Blocking                                                   1
Off-set Feeds, Cassegrainian Feeds                                              1
VHF, UHF AND MICROWAVE ANTENNAS - II                                            9
Horn Antennas – Types, Optimum Horns                                            2
Design Characteristics of Pyramidal Horns                                       1
Lens Antennas – Geometry, Features                                              1
VI     Dielectric Lenses and Zoning, Applications                                      1
Antenna Measurements – Patterns Required                                        1
Set Up, Distance Criterion                                                      1
Directivity and Gain Measurements (Comparison, Absolute and 3-Antenna
Methods)                                                                        2

WAVE PROPAGATION - I                                                            9
Concepts of Propagation – frequency ranges and types of propagations            2
Ground Wave Propagation–Characteristics                                         1
Parameters, Wave Tilt, Flat and Spherical Earth Considerations                  1
VII    Sky Wave Propagation – Formation of Ionospheric Layers and their                1
Characteristics Reflection and Refraction, Critical Frequency
Mechanism of                                                                    1
MUF & Skip Distance – Calculations for flat and spherical earth cases           1
Optimum Frequency, LUHF, Virtual Height                                         1
Ionospheric Abnormalities, Ionospheric Absorption                               1
WAVE PROPAGATION – II                                                           9
Basic Transmission Loss Calculations                                            1
Space Wave Propagation – Mechanism                                              1
VIII   LOS and Radio Horizon                                                           1
Tropospheric Wave Propagation – Radius of Curvature of path                     1
Effective Earth’s Radius, Effect of Earth’s Curvature                           1
Field Strength Calculations, M-curves and Duct Propagation                      2
Tropospheric Scattering                                                         1
Total Classes    72

```
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
 views: 0 posted: 1/12/2013 language: Unknown pages: 2