| ANTENNAS AND PROPAGATION
(objectives)
The course aims to complete training on antennas received in previous courses, particularly in relation to the study and design of aperture antennas, planar antennas and arrays of antennas. It also introduces the problem of electromagnetic scattering from structures present in the air or in the soil. Areas of application: biomedical industry, electrical, electronics and telecommunications.
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Code
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20810153 |
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Language
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ENG |
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Type of certificate
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Profit certificate
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Credits
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9
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Scientific Disciplinary Sector Code
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ING-INF/02
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Contact Hours
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72
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Type of Activity
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Core compulsory activities
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Teacher
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SCHETTINI GIUSEPPE
(syllabus)
Fundamentals of electromagnetic radiation and antenna parameters. Radiation from a short current filament. Radiation from a small current loop. Radiation from arbitrary current distribution. Half-wave dipole antennas. Antenna impedance. Folded dipole, short dipole, and monopole antennas.
Receiving antennas. Reciprocity theorem and effective area. Polarization mismatch. Friis transmission formula. Noise in communication systems. Noise temperature of an antenna.
Introduction to antenna arrays. Uniform one-dimensional arrays. End-fire and broadside arrays. Uniform two-dimensional arrays. Array design. Binomial and polynomial arrays, Chebyshev method. Feeding networks, Butler Matrices. Parasitic and log-periodic arrays.
Aperture antennas. Analysis and synthesis. Radiation from a planar aperture: the Fourier transform method. Radiation from rectangular and circular aperture. Application of field-equivalence principles to aperture radiation. Open waveguides and horn antennas. Ray optics. Microwave lens. Paraboloidal reflector antennas: efficiency, directivity, cross-polarization. Induced current method. Feeds with low cross-polarization. Dual reflector systems. Radiation from slots. Microstrip antennas. Artificial periodic media. Electromagnetic Band-Gap media and their application to antennas.
Scattering of the radiation: general environment and canonical cases. Plane-wave scattering by a conducting cylinder, E- and H- polarization. Dielectric cylinder.
(reference books)
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.
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Dates of beginning and end of teaching activities
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From 27/09/2021 to 21/01/2022 |
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Delivery mode
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Traditional
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Attendance
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not mandatory
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Evaluation methods
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Oral exam
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Teacher
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BACCARELLI PAOLO
(syllabus)
Propagation between fixed points: presence of earth, surface waves and reflection from flat surface. Refractive index of a ionized medium. Ray curvature a ionospheric plasma.
(reference books)
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.
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Dates of beginning and end of teaching activities
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From 27/09/2021 to 21/01/2022 |
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Delivery mode
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Traditional
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Attendance
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not mandatory
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Evaluation methods
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Oral exam
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Università Roma Tre