of ECE P a g e 2ģ with Non-uniform Amplitude Distributions - General considerations and Bionomial Arrays, Illustrative problems. UNIT IV : Antenna Arrays & Measurements: Point sources - Definition, Patterns, arrays of 2 Isotropic sources- Different cases, Principle of Pattern Multiplication, Uniform Linear Arrays Broadside Arrays, Endfire Arrays, EFA with Increased Directivity, Derivation of their characteristics and comparison, BSAa CREC Dept.
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UNIT III :VHF, UHF and Microwave Antennas - II: Micro strip Antennas- Introduction, features, advantages and limitations, Rectangular patch antennas- Geometry and parameters, characteristics of Micro strip antennas, Impact of different parameters on characteristics, reflector antennas - Introduction, Flat sheet and corner reflectors, parabola reflectors- geometry, pattern characteristics, Feed Methods, Reflector Types - Related Features, Lens Antennas - Geometry of Non-metallic Dielectric Lenses, Zoning, Tolerances, Applications, Illustrative Problems. Horn Antennas- Types, Fermat s Principle, Optimum Horns, Design considerations of Pyramidal Horns, Illustrative Problems. Helical Antennas-Helical Geometry, Helix modes, Practical Design considerations for Monofilar Helical Antenna in Axial and Normal Modes. UNIT II : VHF, UHF and Microwave Antennas - I: Loop Antennas - Introduction, Small Loop, Comparison of far fields of small loop and short dipole, Radiation Resistances and Directives of small and large loops (Qualitative Treatment), Arrays with Parasitic Elements - Yagi - Uda Arrays, Folded Dipoles & their characteristics. UNIT I : Antenna Basics & Dipole antennas: Introduction, Basic antenna parameters- patterns, Beam Area, Radiation Intensity, Beam Efficiency, Directivity-Gain-Resolution, Antenna Apertures, Effective height, Fields from oscillating dipole, Field Zones, Shape-Impedance considerations, Polarization Linear, Elliptical, & Circular polarizations, Antenna temperature, Antenna impedance, Front to-back ratio, Antenna theorems, Radiation Basic Maxwell s equations, Retarded potential-helmholtz Theorem, Radiation from Small Electric Dipole, Quarter wave Monopole and Half wave Dipole Current Distributions, Field Components, Radiated power, Radiation Resistance, Beam width, Natural current distributions, far fields and patterns of Thin Linear Center-fed Antennas of different lengths, Illustrative problems. g) Acquire team-work skills for working effectively in groups. f) Develop technical & writing skills important for effective communication. e) Determine the radiation patterns (in principal planes) of antennas through measurement setups. d) Design some practical antennas such as dipole, Yagi - uda, and horn antennas. c) Become proficient with analytical skills for understanding practical antennas. Learning Outcome: Through lecture, and out-of-class assignments, students are provided learning experiences that enable them to: a) Understand the basic principles of all types of antennas and b) Analyze different types of antennas designed for various frequency ranges. and broadband, aperture type and horn antennas. To know the applications of some basic and practical configurations such as dipoles, loops, 4. Applying the principles of antennas to the analysis, design, and measurements of antennas. To introduce the fundamental principles of antenna theory and various types of antennas. III - I Sem (13A04501) ANTENNAS & WAVE PROPAGATION Course Objective: 1. of ECE P a g e 1Ģ JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY ANANTAPUR B.Tech. 1 Lecture Notes On Antenna & Wave Propagation B.TECH ECE III YEAR I SEMESTER (JNTUA-R13) by Dr.V.Thrimurthulu Professor & Head Department of Electronics & Communication Engineering Chadalawada Ramanamma Engineering College Chadalawada Nagar, Renigunta Road Tirupathi CREC Dept.
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