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  • Papers tagged with : Method of Moments | TICRA
    Graphical Processing Units GTD Measurement Method of Moments MM wave Mode matching Multilevel Fast Multipole Method Near field Optimization Physical Optics Reflectarray Reflector antenna Scattering Papers tagged with Method of Moments 01 Mar 1974 Computation of Radiation from Wire Antennas on Conducting Bodies Authors Niels Christian Albertsen A theoretical formulation in terms of combined mag netic and electric field integral equations is presented for the class of electromagnetic problems in

    Original URL path: http://www.ticra.com/papers/8?page=3 (2016-05-01)
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  • A Reconformable Reflector for a Sub-MM Wave Reflector Antenna | TICRA
    the surface has been realised Several configuration shapes have been evaluated to prove the concept using an accurate 3D measurement machine of Media Lario With a reconformable reflector as sub reflector one can alleviate requirements for a main reflector in a dual reflector system which otherwise would be very challenging and expensive for sub mm applications This is of interest for instance for radiometers sounders or ground based radiotelescopes The

    Original URL path: http://www.ticra.com/papers/reconformable-reflector-sub-mm-wave-reflector-antenna (2016-05-01)
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  • Corrective Subreflectors for Millimetre and Sub-Millimetre Wave Applications | TICRA
    using an electroformed Nickel shell supported and controlled by 19 actuators If such a system is used as subreflector in a millimetre wave antenna system for limb sounding applications it is possible to reduce the accuracy requirements to the main reflector and thereby save on overall costs Instead the shape of the subreflector is controlled to correct for the thermally induced deformations on the main reflector The paper describes the

    Original URL path: http://www.ticra.com/papers/corrective-subreflectors-millimetre-and-sub-millimetre-wave-applications (2016-05-01)
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  • Reconformable Reflector for Millimetre and Submillimetre -Wave Reflector Antennas | TICRA
    investigations and use of a reconformable reflector Implementation is discussed for millimetre and or sub millimetre wave antenna configurations The perspectives of alleviating requirements for the high accuracy main reflector which can be very expensive are of great interest This is the case in particular for space applications with stringent environmental constraints Applications for radiometers sounders or ground based radio telescopes are of interest The technological implementation is based on

    Original URL path: http://www.ticra.com/papers/reconformable-reflector-millimetre-and-submillimetre-wave-reflector-antennas (2016-05-01)
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  • Fast and Accurate Design Tool for Rotationally Symmetric Reflector Antennas with 3D Waveguide Components and Support Structures | TICRA
    tool is based on a combination of four solvers Mode Matching MM for cylindrical wave guiding structures a newly developed higher order BoR MoM for rotationally symmetric structures higher order 3D MoM for arbitrary waveguide components or reflector support structures and PO for extremely large reflectors These four solvers are combined using a rigorous domain decomposition approach based on scattering and admittance matrices and the concept of radiation ports is

    Original URL path: http://www.ticra.com/papers/fast-and-accurate-design-tool-rotationally-symmetric-reflector-antennas-3d-waveguide (2016-05-01)
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  • Analysis and Optimization of a Curved Transmit-Receive Contoured Beam Reflectarray | TICRA
    The curved reflectarray is designed to radiate a contoured beam over a European coverage in both transmit and receive frequency bands for dual linear polarization For the analysis of the curved reflectarray the spectral domain method of moments assuming local periodicity is used and its accuracy is verified by comparisons with full wave method of moments simulations For the optimization a direct optimization approach where all the array elements are

    Original URL path: http://www.ticra.com/papers/analysis-and-optimization-curved-transmit-receive-contoured-beam-reflectarray (2016-05-01)
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  • Fast and Accurate Analysis of Reflector Antennas with Struts and Satellite Platform Scattering | TICRA
    features such as satellite platforms One method is a MoM based strut model and represents an improvement of an existing PO based model thus enabling analysis of concave cross sections and dielectric materials while generally speeding up the analysis The other is a full wave higher order MLFMM which offers a significant reduction of the required computational resources compared to commonly available lower order MLFMM The methods are demonstrated on

    Original URL path: http://www.ticra.com/papers/fast-and-accurate-analysis-reflector-antennas-struts-and-satellite-platform-scattering (2016-05-01)
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  • Adaptive Grouping for the Higher-Order Multilevel Fast Multipole Method | TICRA
    the grouping of the basis function patterns in the multilevel fast multipole method is presented yielding significant memory savings compared to the traditional Octree grouping for most discretizations particularly when using higher order basis functions Results from both a uniformly and nonuniformly meshed scatterer are presented showing how the technique is worthwhile even for regular meshes and demonstrating that there is no loss of accuracy in spite of the large

    Original URL path: http://www.ticra.com/papers/adaptive-grouping-higher-order-multilevel-fast-multipole-method (2016-05-01)
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