Università Roma Tre

Fundamentals of electromagnetic radiation and parameters of an antenna. Short dipole radiation. Radiation from a current loop. Radiation from an arbitrary distribution of current. Lambda dipole means. Antenna impedance. Folded dipole, short dipole and monopole antenna. Receiving antennas. Reciprocity theorem and effective area. Polarization mismatch. Friis transmission formula. Noise in communication systems. Antenna noise temperature.

Introduction to arrays. One-dimensional, broad-side, end-fire arrays. Two-dimensional arrays. Power supply networks. Parasitic arrays. Receiving antennas: reciprocity theorem and effective area, Friis transmission formula. Antenna noise temperature. Array design. Chebyshev method, binomial arrays, polynomial arrays. Power supply networks. Butler matrices. Parasitic arrays. Log-periodic arrays.

Aperture antennas: analysis and design. Radiation from a flat aperture. Fourier transform method. Radiation from rectangular and circular openings. Principle of equivalence. Application of the principle of equivalence to aperture radiation. Horn antennas. Radiation from rectangular and circular waveguides. Geometric optics. Microwave lenses. Paraboloid antennas: efficiency, directivity, cross-polarization. Eddy current method. Low cross-polar feeds. Dual reflector systems. Radiation from fissure. Synthesis of fissure alignments. Planar microstrip antennas. Properties of periodic and electromagnetic band-gap artificial media. Application to antennas.
Diffusion of radiation in complex electromagnetic environment and canonical cases. Scattering of a plane wave from a conducting cylinder, polarization E and H. Dielectric cylinder.

Propagation between fixed points: presence of earth, surface waves and reflection from flat surface. Refractive index of a ionized medium. Ray curvature in a ionospheric plasma.

The exercitations are an integral part of the exam program.

A. Paraboni, M. D’Amico, “Radiopropagazione” Mc Graw-Hill Libri Italia.
A. Paraboni, "Antenne", Mc Graw-Hill Libri Italia.
C. Balanis, "Antenna theory, analysis and design", 3rd edition, Wiley,
Robert E. Collin, "Antennas and Radiowave propagation", McGraw-Hill Book Company.