OBIETTIVI E CONTENUTI

OBIETTIVI FORMATIVI

Il corso si propone di fornire competenze sui fenomeni di propagazione elettromagnetica guidata. L'insegnamento si sviluppa fornendo i concetti che consentono di analizzare i circuiti operanti a radiofrequenze o microonde. La parte finale dell'insegnamento si pone l'obiettivo di fornire gli strumenti necessari alla progettazione di simulatori elettromagnetici affidabili.

MODALITA' DIDATTICHE

Le lezioni e gli esercizi sono svolti dal docente in aula. Le esercitazioni in laboratorio sono svolte in parte dal docente e in parte dagli studenti.

PROGRAMMA/CONTENUTO

• Course organization, motivation and applications (1; 1)
• Introduction to guided propagation (1;2)
• Maxwell's equations in form suited to study mode propagation (1;3)
• Transverse components in terms of the axial components. Equations for the axial components (2;5)
• Boundary conditions on perfect electric conductors for the axial components. Conditions at dielectric interfaces for the same components (2;7)
• TEM modes and consequences on voltages and currents (2;9)
• Exercises on the calculation of TEM modes in guiding structures of interest (2;11)
• Propagation of TE and TM modes in closed and homogeneous guiding structures (3;14)
• Exercise: applications in electromagnetic compatibility (0.5;14.5)
• Considerations about group, phase, signal velocities (2;16.5)
• The effect of dielectric losses on the propagation of TE and TM modes in closed and homogeneous guiding structures (2;18.5)
• Exercises related to the modes in rectagular waveguides (1.5;20)
• Exercise: current on the wall of a WR in the presence of the fundamental mode. Slotted waveguides for measures and slot antennas (2;22)
• Circular waveguides and related applications (1;23)
• Modal vectors, voltages, currents and impedances. Fictitious transmission lines for determining the axial dependence of the modal fields in closed and homogeneous guiding structures (2;25)
• Quasi-TEM modes for inhomogeneous transmission lines (2;27)
• A few considerations on the modes of dielectric waveguides (3;30)
• Mode completeness and its consequences (2;32)
• Active power transmitted by modes through a cross-section (2;34)
• A quick analysis of resonant cavities (2;36)
• Effects of metal losses on mode propagation (2;38)
• Approximate descriptions of linear passive components: matrices S, generalized S, Z, Y (2;40)
• Common microwave components with one, two, three and four ports: simple loads, attenuators, phase shifters, insulators, overview on filters, directional couplers, circulators, hybrid junctions (4;44)
• Common applications of components: phase shifters in simple antenna arrays; circulators as duplexers; attenuators, phase shifters, directional couplers and hybrid junctions in microwave measurements (2;46)

TESTI/BIBLIOGRAFIA

• Materiale distribuito in aula
• Robert E. Collin, Foundations for microwave engineering, McGraw-Hill, 1992, New York, USA
• Robert S. Elliott, An Introduction to Guided Waves and Microwave Circuits, Prentice Hall, 1993
• Robert E. Collin, Field theory of guided waves, McGraw-Hill, 1960, New York, USA
• Fred Gardiol, Hyperfrequences, Editions Georgi, 1981, Lausanne, Switzerland
• D. Marcuse, Light transmission optics, Van Nostrand Reinhold Company, 1972, New York, USA

DOCENTI E COMMISSIONI

Commissione d'esame

DANIELE CAVIGLIA (Presidente)

MIRCO RAFFETTO (Presidente)

GIAN LUIGI GRAGNANI

MATTEO PASTORINO

ANDREA RANDAZZO

LEZIONI

Orari delle lezioni

GUIDING ELECTROMAGNETIC CIRCUITS & SYSTEMS

ESAMI

MODALITA' D'ESAME

Durante l'esame orale vengono poste almeno tre domande, di cui almeno una di tipo teorica e almeno una di tipo pratico (molto spesso un esercizio).

MODALITA' DI ACCERTAMENTO

Al termine dell'insegnamento lo studente dovra' dimostrare di conoscere la teoria della propagazione guidata e i principi di funzionamento dei piu' semplici componenti lineari a microonde.

Calendario appelli

ALTRE INFORMAZIONI

Ricevimento: lunedi', dalle ore 17:00 alle ore 18:00, in via Rodi 1/1.