Antenna parameters - Radiation patterns, Patterns in principal planes, Main lobe and side lobes, Beamwidths, Beam area, Radiation intensity, Beam efficiency, Directivity, Gain and resolution, Antenna apertures, Aperture efficiency, Effective height related problems. Thin Linear Wire AntennasRetarded potentials, Radiation from small electric dipole, Quarterwave monopole and halfwave dipole - Current distributions, Evaluation of field components, Power radiated, Radiation resistance, Beamwidths, Directivity, Effective area and effective height. Natural current distributions, Fields and patterns of thin linear center-fed antennas of different lengths, Radiation resistance at a point which is not current maximum. Antenna theorems - Applicability and proofs for equivalence of directional characteristics, Loop antennas : Small loops - Field components, Comparison of far fields of small loop and short dipole, Concept of short magnetic dipole, D and R relations for small loops.

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Antenna parameters - Radiation patterns, Patterns in principal planes, Main lobe and side lobes, Beamwidths, Beam area, Radiation intensity, Beam efficiency, Directivity, Gain and resolution, Antenna apertures, Aperture efficiency, Effective height related problems. Thin Linear Wire AntennasRetarded potentials, Radiation from small electric dipole, Quarterwave monopole and halfwave dipole - Current distributions, Evaluation of field components, Power radiated, Radiation resistance, Beamwidths, Directivity, Effective area and effective height.

Natural current distributions, Fields and patterns of thin linear center-fed antennas of different lengths, Radiation resistance at a point which is not current maximum. Antenna theorems - Applicability and proofs for equivalence of directional characteristics, Loop antennas : Small loops - Field components, Comparison of far fields of small loop and short dipole, Concept of short magnetic dipole, D and R relations for small loops.

Antenna Arrays2 element arrays - Different cases, Principle of pattern multiplication, N element uniform linear arrays - Broadside, Endfire arrays, EFA with increased directivity, Derivation of their characteristics and comparison; Concept of scanning arrays, Directivity relations no derivations , Related problems, Binomial arrays, Effects of uniform and non-uniform amplitude distributions, Design relations. Non-Resonant RadiatorsIntroduction, Travelling wave radiators - Basic concepts, Longwire antennas - Field strength calculations and patterns, V-antennas, Rhombic antennas and design relations, Broadband antennas : Helical antennas - Significance, Geometry, Basic properties; Design considerations for monofilar helical antennas in axial mode and normal modes Qualitative treatment.

Antenna measurements - Patterns required, setup, Distance criterion, Directivity and gain measurements Comparison, Absolute and 3-Antenna methods. Wave Propagation - IConcepts of propagation, Frequency ranges and types of propagations. Ground wave propagation - Characteristics, Parameters, Wave tilt, Flat and spherical earth considerations. Sky wave propagation - Formation of ionospheric layers and their characteristics, Mechanism of reflection and refraction, Critical frequency, MUF and skip distance - Calculations for flat and spherical earth cases, Optimum frequency, LUHF, Virtual height, Ionospheric abnormalities, Ionospheric absorption.

Wave Propagation - IIFundamental equation for free-space propagation, Basic transmission loss calculations. Space wave propagation - Mechanism, LOS and radio horizon.

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## Antenna & Wave Propagation

Author by : K. Bakshi A. Bakshi U. Antenna parameters - Radiation patterns, Patterns in principal planes, Main lobe and side lobes, Beamwidths, Beam area, Radiation intensity, Beam efficiency, Directivity, Gain and resolution, Antenna apertures, Aperture efficiency, Effective height related problems. Thin Linear Wire AntennasRetarded potentials, Radiation from small electric dipole, Quarterwave monopole and halfwave dipole - Current distributions, Evaluation of field components, Power radiated, Radiation resistance, Beamwidths, Directivity, Effective area and effective height.

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Antenna characteristics : Radiation pattern, Beam solid angle, Directivity, Gain, Input impedance, Polarization, Bandwidth, Reciprocity, Equivalence of radiation patterns, Equivalence of impedances, Effective Electromagnetic Radiation and Antenna Fundamentals Review of electromagnetic theory : Vector potential, Solution of wave equation, Retarded case, Hertizian dipole. Antenna characteristics : Radiation pattern, Beam solid angle, Directivity, Gain, Input impedance, Polarization, Bandwidth, Reciprocity, Equivalence of radiation patterns, Equivalence of impedances, Effective aperture, Vector effective length, Antenna temperature. Antenna arrays : Linear array and pattern multiplication, Two-element array, Uniform array, Polynomial representation, Array with non-uniform excitation-binomial array. Aperture Antennas Aperture antennas : Magnetic current and its fields, Uniqueness theorem, Field equivalence principle, Duality principle, Method of images, Pattern properties, Slot antenna, Horn antenna, Pyramidal horn antenna, Reflector antenna-Flat reflector, Corner reflector, Common curved reflector shapes, Lens antenna. Antenna measurements : Radiation pattern measurement, Gain and directivity measurements, Anechoic chamber measurement. Radio Wave Propagation Calculation of great circle distance between any two points on earth, Ground wave propagation, Free-space propagation, Ground reflection, Surface waves, Diffraction, Wave propagation in complex environments, Tropospheric propagation, Tropospheric scatter.

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