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  • Reflector Antennas - An Overview of Surface Distortion Effects | TICRA
    Near field Optimization Physical Optics Reflectarray Reflector antenna Scattering Reflector Antennas An Overview of Surface Distortion Effects Abstract Reflector antenna surface distortions may be slowly varying rapidly varying systematic or random Typical examples of each of these types of surface distortions are presented and their consequences on the peak gain and side lobe performance are illustrated It is demonstrated that the impact on the radiation pattern is strongly dependent on

    Original URL path: http://ticra.com/papers/reflector-antennas-overview-surface-distortion-effects (2016-05-01)
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  • Nonlinear Transformations for Accelerating the Convergence of M-Dimensional Series | TICRA
    Mode matching Multilevel Fast Multipole Method Near field Optimization Physical Optics Reflectarray Reflector antenna Scattering Nonlinear Transformations for Accelerating the Convergence of M Dimensional Series Abstract Two transformations for accelerating the convergence of infinite M dimensional series are presented They are generalizations of Shanks e transformation and Levin s one dimensional transformations respectively The transformations are compared with an M dimensional transformation by Levin in numerical examples Publication MATHEMATICS OF

    Original URL path: http://ticra.com/papers/nonlinear-transformations-accelerating-convergence-m-dimensional-series (2016-05-01)
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  • Synthesis and analysis of single shaped reflector antennas | TICRA
    asymptotic theory describ ing electromagnetic fields of infinitely high frequencies only it has for several years constituted the foundation for synthesis of reflector antennas While dual reflectors are usually shaped to produce a certain aperture distribution leading to a pencil beam type pattern with high gain or low side lobes etc single reflectors may be synthesised to generate shaped beams by using the GO directly in the far field In

    Original URL path: http://ticra.com/papers/synthesis-and-analysis-single-shaped-reflector-antennas (2016-05-01)
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  • Caustics and Caustic Corrections to the Field Diffracted by a Curved Edge | TICRA
    when the rays emanate from a source which is placed off the axis of the disk Either two or four singly diffracted rays appear dependent on the far field direction The caustics separate the region of space with two singly diffracted rays from the regions with four singly diffracted rays Corrections are derived which allow the ray description to be continued across the caustics These corrections depend on the local

    Original URL path: http://ticra.com/papers/caustics-and-caustic-corrections-field-diffracted-curved-edge (2016-05-01)
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  • Numerical Check of GTD Near-Field Calculations for the Meteosat Satellite | TICRA
    Near field Optimization Physical Optics Reflectarray Reflector antenna Scattering Numerical Check of GTD Near Field Calculations for the Meteosat Satellite Abstract The near field and the far field patterns from the high gain S band antenna on the METEOSAT are calculated by the geometrical theory of diffraction The far field is transformed into the near field through an expansion in spherical har monics The resulting transformed field agrees well with

    Original URL path: http://ticra.com/papers/numerical-check-gtd-near-field-calculations-meteosat-satellite (2016-05-01)
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  • On the Number of Modes in Spherical Wave Expansions | TICRA
    given by N kr o 10 being the wavenumber and r the radius of the minimum sphere The almost explosive development in computer speed and storage capacity witnessed during the last two decades has made transformations of fields from antennas exceeding thousands of wavelengths feasible and a closer investigation of the above expression seems to be appropriate An improved expression for the number of modes N related to the antenna

    Original URL path: http://ticra.com/papers/number-modes-spherical-wave-expansions (2016-05-01)
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  • Electrical properties of triaxially woven fabrics for reflector antennas | TICRA
    Mode matching Multilevel Fast Multipole Method Near field Optimization Physical Optics Reflectarray Reflector antenna Scattering Electrical properties of triaxially woven fabrics for reflector antennas Abstract The new light weight reflector antenna technology being used by several spacecraft companies requires accurate electromagnetic modelling of the reflector surface properties In particular the new tri axially woven carbon fibre skins are of interest Publication 2003 IEEE AP S Symposium Place Columbus Ohio USA

    Original URL path: http://ticra.com/papers/electrical-properties-triaxially-woven-fabrics-reflector-antennas (2016-05-01)
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  • Design of terrestrial sector-beam antennas using advanced spacecraft contoured beam synthesis software | TICRA
    Abstract The design of a sector beam antenna is described The azimuth and elevation patterns are subject to stringent requirements on gain and isolation A PO based synthesis method is applied to generate a shaped reflector surface that radiates the desired pattern when illuminated by a corrugated horn A centre fed as well as an offset design is presented The designs fulfil the requirements except for side lobes caused by

    Original URL path: http://ticra.com/papers/design-terrestrial-sector-beam-antennas-using-advanced-spacecraft-contoured-beam-synthesis (2016-05-01)
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