This course gives theoretical and experimental basis for the characterisation of microwave and radiofrequency circuits and antennas. The course provides an introduction to the computational electromagnetism and to the use of EM full-wave simulation software (Ansys HFSS and CST Microwave Studio) and MATLAB. At the end of the course the student will be able to plan experimental activities, in the electromagnetic fields area, by adopting the most appropriate equipment and components; the student will also be able to use electromagnetic modelling software.
Transmission lines. Telegraphers’ equations and their solution. Impedance, admittance, and reflection coefficients. Voltage Standing Wave Ratio. Examples of use, and application to practical cases. Smith Chart and the relevant use for matching problems.
Cylindrical metallic waveguides. Eigenvalue problems. Propagation of modes. Rectangular waveguides.
Resonators: Resonant circuits (RLC). Cylindrical resonators: resonant frequencies and modal profiles. Effect of losses. Quality factor. Passive junctions.
Basics of computational electromagnetism: numerical methods based on differential and integral formulations in the time and frequency domain. Description of commercial electromagnetic simulators: Ansys HFSS, CST Microwave Studio. Notes on the use of MATLAB in the numerical calculation for applied electromagnetism. Numerical calculation experiences with commercial electromagnetic simulators and MATLAB: numerical and network characterization of frequency selective surfaces and metasurfaces, numerical and network characterization of discontinuities in rectangular waveguides; analytical / numerical study of electromagnetic propagation in periodic rectangular waveguides.
Use of a microwave didactic bench. Description of components. Experimental use of the bench. Measurements relevant to frequency, wavelength, VSWR, antenna measurements.