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  • Beam-Waveguide Analysis Using Complex Conical Beams | TICRA
    Complex Conical Beams The analysis procedure for one reflector consists of calculating the field spectrum in the auxiliary input output plane expanding the field spectrum into complex conical beams propagating the beams to the subsequent reflector and calculating the reflected fields in the next auxiliary plane via Physical Optics The method is demonstrated on a two reflector system Optimal position of the auxiliary plane and efficient calculation of the field

    Original URL path: http://www.ticra.com/papers/beam-waveguide-analysis-using-complex-conical-beams (2016-05-01)
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  • Final Design and Testing of the 94 GHz Quasi-Optical-Feed for the EarthCARE’S Cloud Profiling Radar | TICRA
    CPR for the EarthCARE satellite is presented Such QOF achieves polarization and frequency tuning as well as separation of transmit and receive channels The initial design of the QOF was made by MAAS and Thomas Keating TK as subcontractor of Astrium GmbH The final contractor of QOF at JAXA and ESA ESTEC is NICT in Japan The final design verification was performed by Astrium with QUAST a new add on

    Original URL path: http://www.ticra.com/papers/final-design-and-testing-94-ghz-quasi-optical-feed-earthcare-s-cloud-profiling-radar (2016-05-01)
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  • Accurate analysis of a quasi-optical network with a polarisation grid | TICRA
    optical network with a polarisation grid Abstract In a quasi optical network the beams are usually focused and guided through the system by means of curved and planar mirrors Physical Optics PO is an accurate analysis tool for these elements but is only valid for perfectly conducting surfaces and must be modified to handle other surface types such as polarisation grids frequency selective filters and other quasi optical elements Publication

    Original URL path: http://www.ticra.com/papers/accurate-analysis-quasi-optical-network-polarisation-grid-0 (2016-05-01)
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  • Knud Pontoppidan | TICRA
    v t Klooster The design of a push broom multi beam radiometer for future ocean observations is described The radiometer provides a sensitivity one order of magnitude higher than a traditional conical scanning 12 Apr 2015 Fast and Accurate Analysis of Reflector Antennas with Struts and Satellite Platform Scattering Authors Niels Vesterdal Oscar Borries Min Zhou Knud Pontoppidan Erik Jørgensen This paper presents two methods related to modelling of reflector antenna struts and surrounding structural features such as satellite platforms One method is a MoM based strut model and 07 Apr 2014 Novel Multi Beam Radiometers for Accurate Ocean Surveillance Authors Cecilia Cappellin Knud Pontoppidan Per Heighwood Nielsen Novel antenna architectures for real aperture multi beam radiometers providing high resolution and high sensitivity for accurate sea surface temperature SST and ocean vector wind OVW 06 Oct 2013 Detailed Diagnostics of the BIOMASS Feed Array Prototype Authors Cecilia Cappellin Knud Pontoppidan The 3D reconstruction algorithm of DIATOOL is applied to the prototype feed array of the BIOMASS synthetic aperture radar recently measured at the DTU ESA Spherical Near Field Antenna Test 08 Apr 2013 Diagnostics of the BIOMASS Feed Array Prototype Authors Cecilia Cappellin Knud Pontoppidan Erik Jørgensen Peter Meincke The 3D reconstruction algorithm is applied to the prototype feed array of the BIOMASS synthetic aperture radar recently measured at the DTU ESA Spherical Near Field Antenna Test Facility in 02 Oct 2012 Electrical Performance Verification Methodology for the P Band SAR Payload of the Biomass Candidate Mission Authors Knud Pontoppidan In this paper an electrical performance verification methodology is proposed for the large deployable reflector antenna of the BIOMASS P band 435 MHz synthetic aperture radar SAR The 05 Oct 2010 Latest Achievements on Reconfigurable Reflector Antennas Modelling Authors Knud Pontoppidan Cecilia Cappellin This paper describes various aspects of a

    Original URL path: http://www.ticra.com/company/staff/knud-pontoppidan (2016-05-01)
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  • A fast physical optics method for the analysis of beam waveguides | TICRA
    an auxiliary plane and the second step a field calculation from this current set The present work has been motivated by the major difficulties associated with accurate analysis of a complex BWG system at THz frequencies One major difficulty is the use of components in the BWG that are large in wavelength These components will make field calculation through the BWG using standard PO methods computationally time consuming An immediate

    Original URL path: http://www.ticra.com/papers/fast-physical-optics-method-analysis-beam-waveguides (2016-05-01)
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  • Quasi-optical beam waveguide analysis using frame based Gaussian beam expansion | TICRA
    Fast Multipole Method Near field Optimization Physical Optics Reflectarray Reflector antenna Scattering Quasi optical beam waveguide analysis using frame based Gaussian beam expansion Abstract A frame based Gaussian beam expansion method which can be used for analysis of quasi optical beam waveguides is presented The method is tested for the scattered field of an ellipsoid at 321 GHz and 3 21 THz Publication Proceedings 13th Intl Symposium on Space THz

    Original URL path: http://www.ticra.com/papers/quasi-optical-beam-waveguide-analysis-using-frame-based-gaussian-beam-expansion (2016-05-01)
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  • A Detailed PO / PTD GRASP Simulation Model for Compensated Compact Range Analysis with Arbitrarily Shaped Serrations | TICRA
    field components from the sub and main reflector edges even though they are equipped with serrations in order to reduce this effect The size shape and alignment of the serrations have a strong influence on the range performance and are important design parameters For performance estimation and optimization detailed EM simulation models are required Integral equation methods like the Method of Moments MoM with Multilevel Fast Multipole MLFMM acceleration promise accurate simulation results However the memory requirements limit simulations nowadays to lower frequencies due to the electrical size of the compact range reflectors For example the main reflector of Astrium s Compensated Compact Range CCR 120 100 including serrations is 1860 λ by 1600 λ in size at 40 GHz Asymptotic methods are suitable for objects of this size however the accuracy has to be investigated and is related to the degree of detail in the model A detailed simulation model based on the Physical Optics PO Physical Theory of Diffraction PTD method is developed in GRASP Each serration is realized as an individual scatterer and can thus be modeled with arbitrary shape and orientation Different modeling techniques have been applied in order to realize an accurate simulation model with

    Original URL path: http://www.ticra.com/papers/detailed-po-ptd-grasp-simulation-model-compensated-compact-range-analysis-arbitrarily-shaped (2016-05-01)
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  • An Accurate and Efficient Error Predictor Tool for CATR Measurements | TICRA
    Range CATR on the basis of the known quiet zone field and the theoretical aperture field distribution of the AUT The comparison with the theoretical far field pattern of the AUT shows the expected measurement accuracy The numerical model takes into account the relative movement of the AUT within the quiet zone and is valid for any CATR and AUT of which the quiet zone and aperture field respectively are

    Original URL path: http://www.ticra.com/papers/accurate-and-efficient-error-predictor-tool-catr-measurements (2016-05-01)
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