Electromagnetic Wave Propagation II

Specific Foundation / Core

The course is also offered to exchange programme students.

In brief, the understanding of the fundamental phenomena of waveguiding (waveguides and transmission lines) and radiation of an electromagnetic wave and the familiarization with and training in the model that describes them. More specifically: • Understanding of the phenomenon, the meaning and operation properties (dispersion equation, modes, cutoff, power) of metallic waveguides through the study of the ideal parallel plates metal waveguide model. Examination of the influence of various operating parameters. Generalisation to ideal metal rectangular waveguides. The handling of small losses. The basic elements of dielectric waveguides operation. • Comprehension of the phenomenon, the meaning and operation properties (dispersion equation, modes, cutoff, power) of transmission lines through the study of the model of the ideal parallel plates transmission line. Examination of the influence of various operating parameters. Generalisation to arbitrary ideal transmission line. Formulation of the circuit model and its connection with the field problem. Introduction and explanation of losses. Important properties and parameters of the transmission line (standing wave, standing wave ratio, reflection coefficient, characteristic impedance, termination, power). Consolidation through the study of the two-wire and coaxial transmission line. • Understanding of the operating of a radiating element and the retarded potentials. The meaning of the antenna near and far field. Comprehension of the parameters of linear antennas (current distribution, power, radiation resistance, directivity, radiation pattern, gain). Consolidation with the study of basic linear antennas (linear and loop dipole, half-wavelength, travelling wave). Operation of a uniform linear array antenna and the array factor. Guided waves: Guided waves and Helmholtz equation. Characteristic equation of dispersion. Field components and power flow. Cut off modes. Guided modes and their types. Standing waves. Propagation velocity. The two parallel perfectly conducting plate guide. TEM, TE and TM modes. Metallic waveguides of rectangular cross section. TE and TM modes. Transmission lines. Transverse electromagnetic wave. Ideal parallel conductor line. Coaxial line. Circuit representation of a transmission line. Losses on waveguide walls. Electromagnetic radiation: Retarded potentials. Near and far field of an antenna. Radiation intensity. Directivity and gain of an antenna. Hertz dipole. Half-wavelength dipole antenna. Loop antenna. Array antennas and array factor.

Guided waves: Guided waves and Helmholtz equation. Characteristic equation of dispersion. Field components and power flow. Cut off modes. Guided modes and their types. Standing waves. Propagation velocity. The two parallel perfectly con-ducting plate guide. TEM, TE and TM modes. Metallic waveguides of rectangular cross section. TE and TM modes. Transmission lines. Transverse electromagnetic wave. Ideal parallel conductor line. Coaxial line. Circuit representation of a transmission line. Losses on waveguide walls. Electromagnetic radiation: Retarded potentials. Near and far field of an antenna. Radiation intensity. Directivity and gain of an antenna. Hertz dipole. Half-wavelength dipole antenna. Loop antenna. Array antennas and array factor.

26-07-2013