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High Frequency methods and traveling wave antennas

This course cover two topics of about 10 hours of lectures each plus exercises, all concentrated in a week. The first part cover the basic issue concerning with the fundamentals of high-frequency techniques; the second part is concerned with travelling wave antennas and basic leaky wave phenomena.

High-frequency techniques
• 1. Introduction on fundamentals - Equivalence principle, PO and Kirchhoff aperture radiation - Non uniform asymptotics - Space domain and spectral diffraction integrals- GO+diffraction, PO+fringe.
• 2. Uniform asymptotic evaluation of radiation and scattering integrals.
• 2.1 Single variable diffraction integrals- interacting (saddle-point) - pole (wedge problem - spectral domain) - interacting (saddle-point) - end point (wedge problem-spatial domain)- interacting (saddle-point) - branch point (Sommerfeld problem) - three collinear saddle points (curved face).
• 2.2 Double variable diffraction integrals- saddle point 2D/partial derivative saddle points - saddle points and poles.
• 3. Uniform theory of diffraction - Edge problem- Double edge- Corner problem - Curved surfaces.
• 4. Incremental diffraction theories- PTD and ILDC- Incremental theory of diffraction (ITD) - impedance BC and generalized impedance BC.
• 5. Truncated Floquet Wave (FW) diffraction theory - Semi-infinite array- Corner array - multilayer environment .
Travelling wave antennas
General features and applications. Fields of a traveling-wave source, leaky waves in open structures. Characterization of traveling-wave antennas: determination of the phase and attenuation constants, relation to the radiation properties. Mechanisms employed to produce leakage: apertures, asymmetries, use of suitable modes. Scanning behavior, phased arrays of leaky-wave line sources, unit-cell approach. Transverse-equivalent networks, aperture admittance, transverse-resonance technique. Radiation-pattern shaping, aperture distribution: tapering procedures for leaky-wave antennas. Example of practical antennas: partially-open metallic waveguides, dielectric structures, printed lines. Feed, losses, manufacture issues. Measurement techniques.

Responsibles:
S. Maci - macis@ing.unisi.it
F. Frezza - fabrizio.frezza@uniroma1.it
 Location: UNISI - Siena / Sapienza - Rome Date: 21/02/2005 - 26/02/2005 Contact Person: Stefano Maci macis@ing.unisi.it
 Items in this section: UNISI_Sapienza_High_frequency_techniques.pdf   (277 kB) Albani21_02_2005.pdf   (1.5 MB) Manara22_02_2005.pdf   (1.1 MB) Martini24_02_2005.pdf   (1008 kB) Martini25_02_2005.pdf   (1.3 MB) Pippi23_02_2005.pdf   (1.6 MB) Polemi21_02_2005part1.pdf   (438 kB) Polemi21_02_2005part2.pdf   (393 kB) Toccafondi23_02_2005.pdf   (1.1 MB) Baccarelli25_02_2005.pdf   (1.9 MB) Burghignoli24_02_2005.pdf   (173 kB) Burghignoli25_02_2005.pdf   (229 kB) Galli25_02_2005part1.pdf   (3.0 MB) Galli25_02_2005part2.pdf   (3.2 MB) Lovat24_02_2005.pdf   (849 kB) Lovat25_02_2005.pdf   (656 kB) TravelingWaveAntennas_Exam.pdf   (43 kB) TravelingWaveAntennas_Exam&Solutions.pdf   (72 kB) TravelingWaveAntennas_ExamResults.pdf   (159 kB) HighFrequencyTecniques_ExamPart1.pdf   (167 kB) HighFrequencyTecniques_ExamPart1&Solution.pdf   (203 kB) HighFrequencyTecniques_ExamPart1_Results.pdf   (74 kB) HighFrequencyTecniques_ExamPart2.pdf   (65 kB) HighFrequencyTecniques_ExamPart2&Solutions.pdf   (94 kB) HighFrequencyTecniques_ExamPart2_Results.pdf   (75 kB) Maci21_02_2005part1.rar   (6.6 MB) Maci21_02_2005part2.rar   (4.7 MB) Arrighetti26_02_2005.pdf   (2.0 MB) Evaluation_form.pdf   (38 kB) Short_course_UNISI.ppt   (1.9 MB) Pathak22_02_2005_part1.pdf   (960 kB) Pathak22_02_2005_part2.pdf   (908 kB) Pathak22_02_2005_part3.pdf   (1016 kB) Pathak22_02_2005_part4.pdf   (918 kB)