Antennas and Wave Propagation
WS 2003 / 2004
Vorlesung mit integrierten Übungsanteilen / 3 SWS
This lecture is presented in English to make the audience familiar with and to
exercise the relevant use of worldwide applied English technical working language.
This includes, of course, a benefit to graduate students from foreign countries.
Concurrent with steadily increasing signal frequencies HF and microwave antennas get
more and more important for applications such as broadband transmission links, radar
remote sensing / navigation, and wireless transfer of high data rates.
Most actual developments like satellite and mobile communications are strongly
expanding all over the world. Miniaturized antenna sensor arrays support novel
techniques of detection of earth resources, control of soil / water
contamination, robotics, etc.
- Maxwell's equations, retarded potentials - Hertzian dipole,
near- / farfield radiation - antenna pattern, beamwidth;
radiation resistance, gain; equivalent circuit model -
electric / magnetic dipole, duality
- Linear antennas: half / full wave dipole, l/4-monopole; crossed
dipoles; mxn-dipole arrays / pattern synthesis - antenna input
impedance, feeding networks, matching - phased arrays / beam
sweeping; radiation coupling, reciprocity; Yagi-antenna (TV) -
broadband antennas / axial radiators - 2 movie
demonstrating development of radiation field structures
- Reflector antennas, parabolic / Cassegrain - aperture antennas
(horn, slot), microwave lens antennas / focusing - antennas as
elmg. sensors / scanning
- Radiative transfer relation / radar equation (e. g.
satellite communication links, SNR); ground / atmospheric scattering,
depolarization effects, attenuation
- Microstrip / patch antennas, coplanar arrays -
strip / slot line feeding, multi-layer substrate
integration - applications e. g. remote sensing, security
- Computer-aided antenna design, optimization of amplitude / phase
distribution - antenna measurement techniques, two-channel
test / reference concept; pattern / gain
calibration - 2 experimental demonstrations for radiation pattern
and input impedance in anechoic chamber