Electromagnetic Fields 2nd : Corse content
Part one: Lines and Waveguides
Time-harmonic waves on transmission lines: an overview
The lumped-element circuit model; wave propagation on a transmission line; characteristic
impedance; lossless line; reflection coefficient; VWSR; the Smith Chart; strip-line and microstrip
line.
Vector and scalar potentials
E.m. fields in homogeneous media; fictitious magnetic charge and current; definition of vector and
scalar potentials; Helmholtz equation for the vector potentials; electric and magnetic fields in terms
of magnetic and electric vector potentials.
Waveguides
Waveguide concept; cylindrical waveguides; general solutions for TE and TM waves; the
rectangular waveguide; detailed solutions for TE and TM modes (the cut-off concept, cut-off
frequency, wave impedance, propagation constant); phase and group delay in a rectangular
waveguide.
Dielectric waveguides
The dielectric slab; odd and even modes; surface waves; cut-off condition in dielectric waveguides.
Part two: Microwave Networks
The scattering matrix
Impedance and equivalent voltages and currents; N-port microwave network analysis;
normalization of voltages and currents; definition of scattering matrix; properties of scattering
matrix; reciprocal networks and lossless networks;
Two-port networks
Scattering matrix properties; transmission, impedance, admittance and chain matrices; some passive
two-ports (line section, shunt admittance, ideal transformer, matching network, ecc) ; power
through a two-port network.
Multi-port networks
Power divider; directional coupler, magic tee.
Part Three: Radiation Principles
Fundamentals of electromagnetic radiation
Basic characteristics of antennas; antenna categories; qualitative aspects of the electromagnetic
radiation; vector potentials in unbounded homogeneous media; the Hertzian dipole; near- and farfield regions; equivalence theorem and its application in the antenna analysis;
Antenna characterization
Power density and radiation intensity; radiation patterns; antenna parameters (directivity, power
gain, input impedance, effective area, efficiency, bandwidth); reciprocity; wave polarization and
antenna polarization; the Friis formula.
Dipoles and some else
Current distribution; electric and magnetic field components in the far-field region; radiation
resistance; radiation pattern; some introductory considerations on aperture-type antenna
Laboratory activity
Rectangular waveguide components
Description of several microwave components in rectangular waveguide; frequency and wavelength
measurement; reflection coefficient measurement through slotted line; measurement of insertion
loss; coupling directivity and insertion loss of a directional coupler in rectangular waveguide;
measurement of coupled and decoupled power in a 3-port circulator; frequency response of a
microwave filter.
Microstrip components
Description of several microstrip components; power measurements; coupling directivity and
insertion loss of a directional coupler; measurements of power transmitted to decoupled port in a 3port circulator; investigation on power divider; insertion loss characteristic of low pass filter;
matching investigation; properties of hybrid ring coupler.