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Viskum (6 hours)
- 1) Brief introduction to the analysis methods for spacecraft- and earth station antennas. PO, PTD, GO, GTD. Definition of directivity, polarisation.
- 2) Radiation from simple apertures, relationship between size, illumination function, directivity and beamwidth.
- 3) Cross-polarisation in offset antennas, design of polarisation sensitive reflectors.
- 4) The dual reflector antenna. Blockage analysis of symmetric designs; compensated offset systems
- 5) Strut scattering effects
Busk Sörensen (4 hours)
- 6) Design of shaped reflectors for contoured beams
- 7) Design of beam waveguide feeding systems for large telescopes. First-order Gaussian- beam analysis. Higher-order Gaussian-beam analysis. Auxiliary plane PO.
- 8) The effect of panel imperfections in large telescopes. The students will be given an opportunity of using state-of-the-art software during exercises to design and analyse reflector antenna systems.
Kildal (4 hours):
- 9) Design and analysis of the tri-reflector radio telescope in Arecibo and other special reflector antennas. The work include synthesis of the two Arecibo subreflectors and analysis by ray tracing and PO. The presentation will also describe the development of a decade bandwidth feed for the US SKA proposal. SKA is planned international radio telescope of one Square Kilometer Aperture area and more than a decade bandwidth. The US proposal is to build 5000 reflector antennas of 16 m diameter.
Sauleau (3 hours):
- 10) Basic theory of dielectric lens antennas (design principles, analytical lenses, aberrations, wide angle lenses, taper control lenses, zoning, inhomogeneous lenses).
- 11) State of the art of current research activities (shaped lens antennas and substrate lenses, reduced-size structures) and main applications (WLAN, high data-rate communications, mm-wave radar and imaging, LEO satellites, High-altitude plateforms, 4th generation of Mobile Broadband Systems, multi-beam antennas, ...).
- 12) Analysis, Synthesis, Optimization and Performance of shaped substrate lenses. Both BoR and 3D arbitrarily-shaped devices are considered. Analysis: asymptotic methods and global EM modelling. Synthesis: analytical and numerical GO-based solutions for the inverse design problem. Optimization: local (CGM) and global (GA) procedures. Performance: input impedance and radiation characteristics. This part is illustrated by many numerical and perimental results at mm-wave frequencies. Moreover, time-domain simulations will be used for educational purposes.
- 13) Future trends (bandwidth enhancement, size reduction, non-homogeneous metamaterials-based lenses, ...).
Maci (3 hours)
- 14)High-frequency methods applied to large reflector antenna problems: the UTD and ITD issues
- 15)The shadow boundary integral technique.
- A) reduction from surface to line integral for canonical reflectors.
- B) acceleration of PO via faceting. ITD corrections
- 16)Representation by NURBS of reflector surface
- 17)Diffraction effects in lens antennas: PO correction by using local Sommerfeld problem
- 18) Influence of a dielectric lens on mutual coupling: internal reflection
In order to register to this course you have to fill in the following registration form:
http://www.ticra-downloads.com/ACE%20Course%20registration.pdf
and e-mail it to mbj@ticra.com or fax it to (+45) 3312 0880. You can also download the registration form in the link below
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