ECT 302

electromagnetics

Preamble

This course aims to impart knowledge on the basic concepts of electric and magnetic fields and its applications.

Course Outcomes

To summarize the basic mathematical concepts related to electromagnetic vector fields.
Analyse Maxwell's equation in different forms and apply them to diverse engineering problems.
To analyse electromagnetic wave propagation and wave polarization
To analyse the characteristics of transmission lines and solve the transmission line problems using Smith chart.
To analyse and evaluate the propagation of EM waves in Wave guides.

Previous year Question papers & solutions

Complete Lecture Playlist

module 1

Introduction to Electromagnetic Theory. Review of vector calculus- curl, divergence gradient. Rectangular, cylindrical and spherical coordinate systems. Expression of curl divergence and Laplacian in cartesian, cylindrical and spherical coordinate system. Electric field and magnetic field, Review of Coulomb's law, Gauss law and Amperes current law. Poisson and Laplace equations, Determination of E and V using Laplace equation.

module 2

Derivation of capacitance and inductance of two wire transmission line and coaxial cable. Energy stored in Electric and Magnetic field. Displacement current density, continuity equation. Magnetic vector potential. Relation between scalar potential and vector potential. Maxwell's equation from fundamental laws. Boundary condition of electric field and magnetic field from Maxwell's equations. Solution of wave equation.

module 3

Propagation of plane EM wave in perfect dielectric, lossy medium, good conductor, media attenuation, phase velocity, group velocity, skin depth. Reflection and re:fraction of plane electromagnetic waves at boundaries for normal & oblique incidence (parallel and perpendicular polarization), Snell's law of refraction, Brewster angle.

module 4

Power density of EM wave, Poynting vector theorem. Polarization of electromagnetic wave linear, circular and elliptical polarisation. Uniform lossless transmission line - line parameters.Transmission line equations, Voltage and Current distribution of a line terminated with load .Reflection coefficient and VSWR Derivation of input impedance of transmission line.

module 5

Transmission line as circuit elements (L and C). Development of Smith chart - calculation of line impedance and VSWR using smith chart. The hollow rectangular wave guide -modes of propagation of wave-dominant mode, group velocity and phase velocity -derivation and simple problems only

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