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  • Niels Vesterdal | TICRA
    TICRA Niels Vesterdal was employed at Thrane Thrane where he conducted an Industrial PhD study on Phased Array Antennas for Mobile Communications Subsequently from 2007 to 2012 he worked at the R D department at Thrane Thrane primarily designing user terminal antennas for mobile satellite communication in the L Ku and Ka bands In 2006 Niels spent 6 months at Jet Propulsion Laboratory in Pasadena as a visiting scholar Papers 10 Apr 2016 New Analysis Capabilities for Electrically Large Antennas and Platforms Authors Erik Jørgensen Oscar Borries Peter Meincke Min Zhou Niels Vesterdal We present recent advances in the RF modelling of electrically large antennas and platforms with an emphasis on reflector antennas and satellite platforms The Higher Order Multilevel Fast 12 Apr 2015 DTU ESA Millimeter Wave Validation Standard Antenna mm VAST Detailed Design Authors Rolf Jørgensen Niels Vesterdal Co authors Oleksiy S Kim Sergey Pivnenko Olav Breinbjerg Kim Branner Peter Berring Christen Malte Markussen Maurice Paquay This paper describes the structural solution to meet these extremely strict stability requirements and the structural analyses done in order to verify that they can be met The paper also 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 12 Apr 2015 New Fast and Robust Modelling Algorithms for Electrically Large Antennas and Platforms Authors Erik Jørgensen Oscar Borries Peter Meincke Min Zhou Niels Vesterdal This paper presents two new modelling algorithms that were recently added to the commercially available GRASP software package for electrically large antenna and scattering problems In particular 12 Oct 2014

    Original URL path: http://ticra.com/company/staff/niels-vesterdal (2016-05-01)
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  • Design and Analysis of a Reflector Antenna System Based on Doubly Curved Circular Polarization Selective Surfaces | TICRA
    reflector antenna system combining two doubly curved Circular Polarization Selective Surfaces to provide a functionality equivalent to that of a dual gridded reflector but in circular polarization The key feature of this design is to use a non resonant CPSS design to avoid the bandwidth limitation of most CPSS designs previously discussed in the literature A specific design at Ku band is investigated and promising results are demonstrated providing a

    Original URL path: http://ticra.com/papers/design-and-analysis-reflector-antenna-system-based-doubly-curved-circular-polarization (2016-05-01)
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  • Cecilia Cappellin | TICRA
    P Balling G Gerini N J G Fonseca and P De Maagt This paper discusses the design and analysis of a reflector antenna system combining two doubly curved Circular Polarization Selective Surfaces to provide a functionality equivalent to that of a 10 Apr 2016 Near Field 3D Reconstruction of the Search and Rescue Antennas on the GALILEO Satellite Authors Cecilia Cappellin Co authors L Salghetti Drioli The 3D reconstruction algorithm of DIATOOL is applied to the Search and Rescue antennas SARANT mounted on the GALILEO satellite recently measured by the planar near field scanner of the Hybrid 12 Apr 2015 Design of a Push Broom Multi Beam Radiometer for Future Ocean Observations Authors Cecilia Cappellin Knud Pontoppidan Per Heighwood Nielsen Co authors N Skou S S Søbjærg A Ihle M Ivashina O Iupikov K 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 Detailed Pattern Computations of the UHF Antennas on the Spacecraft of the ExoMars Mission Authors Cecilia Cappellin Erik Jørgensen Peter Meincke Oscar Borries Co authors C Nardini C Dreyer This paper describes the pattern computations of the UHF antennas mounted on the spacecraft of the EXOMARS mission The analyses are made by the higher order Method of Moments MoM add on to 17 Oct 2014 Filtering of Measurement Noise with the 3D Reconstruction Algorithm Authors Cecilia Cappellin Two different antenna models are set up in GRASP and CHAMP and noise is added to the radiated field The noisy field is then given as input to the 3D reconstruction of DIATOOL and the SWE 07 Apr 2014 Novel Multi Beam Radiometers for Accurate Ocean Surveillance Authors Cecilia Cappellin Knud Pontoppidan Per

    Original URL path: http://ticra.com/company/staff/cecilia-cappellin (2016-05-01)
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  • Near Field 3D Reconstruction of the Search and Rescue Antennas on the GALILEO Satellite | TICRA
    on the GALILEO satellite recently measured by the planar near field scanner of the Hybrid ESA RF and antenna Test Zone HERTZ at ESTEC SARANT operates in L and UHF band and is one of the many antennas sitting on the GALILEO satellite The measured field showed a pattern deformation that could be due to the presence of the other antennas on the satellite Earth panel The purpose of this

    Original URL path: http://ticra.com/papers/near-field-3d-reconstruction-search-and-rescue-antennas-galileo-satellite (2016-05-01)
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  • Hans-Henrik Viskum | TICRA
    of related areas including the design of Compact Antenna Test Ranges CATRs capable of 11 Oct 2015 Design and Validation of Compact Antenna Test Ranges using Computational EM Authors Oscar Borries Peter Meincke Erik Jørgensen Hans Henrik Viskum Frank Jensen Co authors C H Schmidt Airbus Defence Space Munich Germany The design of modern Compact Antenna Test Ranges CATRs is a challenging task and to achieve strong performance simulation using computational electromagnetics is a vital part of the design 06 Oct 2013 A Detailed PO PTD GRASP Simulation Model for Compensated Compact Range Analysis with Arbitrarily Shaped Serrations Authors Hans Henrik Viskum Co authors Carsten Schmidt A Geise Astrium GmbH Compensated compact ranges offer accurate testing techniques for large devices under test The quiet zone field performance is affected by diffracted field components from the sub and main 07 Jul 2013 CHAMP The Dedicated Design Tool for Rotationally Symmetric Horns and Reflector Terminals Authors Hans Henrik Viskum A fast and accurate approach to designing horns and reflectors is implemented in the CHAMP code The paper presents examples of designs including shaped reflectors and a horn with a dielectric 13 Jul 2012 Advances in TICRA EM Tools Authors Hans Henrik Viskum Many exciting developments are underway at TICRA as evidenced by recent and upcoming releases of new EM tools One of the big news is the release of GRASP 10 which sets new standards for 18 Oct 2011 Application of Advanced Field Reconstruction Algorithms Authors Cecilia Cappellin Peter Meincke Erik Jørgensen Hans Henrik Viskum A general accurate and efficient stand alone commercial program for antenna diagnostics DIATOOL has been developed by TICRA The software reconstructs the field or the equivalent currents on a 03 Jul 2011 Efficient Analysis of Reflector Antennas using GRASP Authors Erik Jørgensen Hans Henrik Viskum Stig Busk

    Original URL path: http://ticra.com/company/staff/hans-henrik-viskum (2016-05-01)
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  • Design and Validation of Compact Antenna Test Ranges using Computational EM | TICRA
    is a vital part of the design process However the large electrical size geometrical complexity and high accuracy requirements often mean that the available computer resources are not sufficient for running the simulation In the present paper we highlight some recent developments that allow for much larger faster and more accurate simulations than was possible just a few years ago and apply them to realistic ranges The conclusion is clear

    Original URL path: http://ticra.com/papers/design-and-validation-compact-antenna-test-ranges-using-computational-em (2016-05-01)
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  • Frank Jensen | TICRA
    Papers 11 Oct 2015 Design and Validation of Compact Antenna Test Ranges using Computational EM Authors Oscar Borries Peter Meincke Erik Jørgensen Hans Henrik Viskum Frank Jensen Co authors C H Schmidt Airbus Defence Space Munich Germany The design of modern Compact Antenna Test Ranges CATRs is a challenging task and to achieve strong performance simulation using computational electromagnetics is a vital part of the design 18 Oct 2011 A Novel Accurate Pattern Fitting of Noisy Irregular Beam Data for the Planck Space Telescope Authors Oscar Borries Frank Jensen Per Heighwood Nielsen Kriging fitting originally developed for geological exploitation is here applied for fitting an expected pattern to noisy irregular in flight measurements of a satellite antenna 18 Oct 2011 Grating Lobe Pattern Retrieval from Noisy Irregular Beam Data for the Planck Space Telescope Authors Per Heighwood Nielsen Oscar Borries Frank Jensen In flight measurements of satellite antenna patterns are often given in a highly irregular grid and the data may be influenced by severe noise such that an accurate pat tern determination is 10 Oct 2010 Improved In Flight Pattern Retrieval by Reflector Deformation Fitting Authors Frank Jensen Per Heighwood Nielsen The in flight pattern measurements of a sub millimetre space telescope may be improved by determining the actual reflector anomalies and then include the knowledge to these in the final pattern de 12 Apr 2010 In Flight Retrieval of Reflector Anomalies for the Planck Space Telescope Authors Frank Jensen Per Heighwood Nielsen It is important to know the antenna patterns for the Planck Space Telescope with high accuracy for detectors operating at frequencies from 30 to 857 GHz This could not be achieved with sufficient 01 Nov 2009 Best Fit Adjustments of the Reflectors in a Compact Range Authors Frank Jensen Per Heighwood Nielsen ESA s Compact Antenna

    Original URL path: http://ticra.com/company/staff/frank-jensen (2016-05-01)
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  • Full Wave Simulation of Large Satellite for the Evaluation of Multiple Frequency Antennas Interference | TICRA
    Results prove the possibility of simulating the entire spacecraft modelling the instruments of the payload in a realistic environment to predict unwanted interference and consequent unexpected RF behaviour that would be impossible to be foreseen by either stand alone or simplified configuration of the antennas on board The simulations are performed making use of the new full wave analysis tool available in TICRA s GRASP and show the capability of

    Original URL path: http://ticra.com/papers/full-wave-simulation-large-satellite-evaluation-multiple-frequency-antennas-interference (2016-05-01)
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