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  • Papers tagged with : EM modelling | TICRA
    a joint effort in the Antenna Centre of Excellence ACE and the European Antenna Modelling Library EAML 10 Oct 2010 Latest Achievements in Antenna Diagnostics and Processing of Measured Fields Authors Cecilia Cappellin Erik Jørgensen Peter Meincke A stand alone commercial program performing advanced electromagnetic processing of measured data is being developed by TICRA The program reads the measured field and computes the extreme near 05 Oct 2010 Improved Source Reconstruction Technique for Antenna Diagnostics Authors Erik Jørgensen Peter Meincke Cecilia Cappellin This paper presents an improved inverse Method of Moment technique that allows surface currents to be reconstructed on the surface of an antenna The input to the algorithm is 05 Oct 2010 Model Based System Engineering Components of Antennas Authors Stig Busk Sørensen Oscar Borries Very sophisticated antenna models are available today for the accurate prediction of antenna performances in particular those included in the European Antenna Modeling Library in which GRASP ADF 11 Jul 2010 Different Types of Circular Domain Wave objects Authors Stig Busk Sørensen This paper discusses a novel method for computing aperture radiated fields by means of two new types of circular domain beams with azimuthal phase variation These circular domain beams rigorously 12 Apr 2010 New Results from the SoftLAB Benchmark of Antenna Software Authors Cecilia Cappellin This paper gives an overview of the antenna software benchmarking activity that took place within the Software Group of the EurAAP association in 2009 A particular focus is brought to one of the 12 Apr 2010 Optimizing a Corrugated Horn for Telecommunication and Tracking Missions using a new flexible Horn Design Software Authors Poul Erik Frandsen Michael Lumholt A new design approach and an associated software tool for conical corrugated horn antennas has been developed in a joint TICRA Thales Alenia Space ESA project The software

    Original URL path: http://www.ticra.com/papers/9?page=3 (2016-05-01)
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  • Papers tagged with : EM modelling | TICRA
    actual weather situation can reduce the transponder power margin by as much as 6 dB The 10 Jun 2007 Accurate analysis of a quasi optical network with a polarisation grid Authors Stig Busk Sørensen Hans Henrik Viskum Knud Pontoppidan 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 06 Nov 2006 Combining GTD with Mom in Analysing the Scattering from the LICEF Antennas on the SMOS Satellite Authors Frank Jensen Knud Pontoppidan The present paper describes the determination of the scattering from the LICEF antenna elements on the SMOS satellite taking into account that the solar panels rotate during the flight of the 01 Nov 2004 Higher Order Hierarchical Legendre Basis Functions for Electromagnetic Modeling Authors Erik Jørgensen Peter Meincke This paper presents a new hierarchical basis of arbitrary order for integral equations solved with the method of moments MoM The basis is derived from orthogonal Legendre polynomials which are 22 Jun 2003 A Reconformable Reflector for a Sub MM Wave Reflector Antenna Authors Hans Henrik Viskum Results are presented of investigations with a laboratory model of a reconformable reflector for MM and sub MM applications A configuration with 19 actuators to control the surface has been 18 Sep 2002 A fast physical optics method for the analysis of beam waveguides Authors Stig Busk Sørensen A fast physical optics PO method is presented which in two steps calculates the scattered field of an optical component in a beam waveguide BWG The first step involves a calculation of a set 18 Sep 2002 Electrical analysis of light weight triangular weave reflector antennas Authors Knud Pontoppidan The new light weight reflector antenna technology being developed by several spacecraft

    Original URL path: http://www.ticra.com/papers/9?page=4 (2016-05-01)
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  • Papers tagged with : EM modelling | TICRA
    exemplified by the Planck Telescope Authors Stig Busk Sørensen Per Heighwood Nielsen Knud Pontoppidan In this paper bolometric detectors applied in conjunction with reflector antenna feed horns that support multiple modes are studied As an example the preliminary design of the Planck telescope 18 Jun 1995 Fade Compensation in Antenna Optimization Authors Hans Henrik Viskum Contoured beam satellite antennas are usually designed by optimizing the antenna gain pattern over the desired coverage such that the minimum gain is maximized and the ripple throughout the region 28 Jun 1993 A dual offset shaped reflector with a tilted elliptical main reflector Authors Hans Henrik Viskum Spacecraft antennas with elliptical beams low cross polarization and low side lobes can be designed systematically using Geometrical Optics Viskum et al 1992 By controlling the amplitude 01 Dec 1989 Creeping Wave Modes for a Dielectric Coated Cylinder Authors Niels Christian Albertsen The spectrum of creeping waves that can exist on the sur face of a dielectric coated cylinder is determined by the poles in the Green s function for the cylinder Accounts of the position of these 01 Feb 1987 The SNFGTD Method and its Accuracy Authors Hans Henrik Viskum The spherical near field geometrical theory of diffraction SNFGTD method is an extended aperture method by which the near field from an antenna is computed on a spherical surface enclosing the 04 Nov 1986 Reflector Antennas An Overview of Surface Distortion Effects Authors Knud Pontoppidan 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 01 Jun 1984 Analysis of subreflectors for dual reflector antennas Authors Niels Christian Albertsen Knud Pontoppidan The paper presents various methods for the calculation of the field reflected from a subreflector in a dual

    Original URL path: http://www.ticra.com/papers/9?page=5 (2016-05-01)
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  • Reflector Antenna Analysis using Physical Optics on Graphics Processing Units | TICRA
    from electrically large bodies It requires significant computational work and little memory and is thus well suited for application on a Graphics Processing Unit Here we investigate the performance of an implementation and demonstrate that while there are some implementational pitfalls a careful implementation can result in impressive improvements Publication Proc EuCAP 2014 The 8th European Conference on Antennas and Propagation Place The Hague The Netherlands Year 2014 Graphical Processing

    Original URL path: http://www.ticra.com/papers/reflector-antenna-analysis-using-physical-optics-graphics-processing-units (2016-05-01)
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  • Combining GTD with Mom in Analysing the Scattering from the LICEF Antennas on the SMOS Satellite | TICRA
    in Analysing the Scattering from the LICEF Antennas on the SMOS Satellite Abstract The present paper describes the determination of the scattering from the LICEF antenna elements on the SMOS satellite taking into account that the solar panels rotate during the flight of the satellite The task is well suited for a ray analysis based on the Uniform Geometrical Theory of Diffraction GTD since this method is fast which is essential due to the time varying scattering structure However the source antennas are mounted in deployable arms which interact with the antenna elements and shields for the direct illumination of the satellite body and the solar panels GTD is not suited for determining the scattering in structures very close to the source antenna The scattering in these structures may then be solved by the Method of Moments MoM On the other hand the full structure is too large to be handled by MoM The paper describes how the two methods are combined especially the problem of delimiting the structures handled by MoM from the structures handled by GTD as the latter must be in the far field of the former while they nevertheless are connected parts of the same satellite

    Original URL path: http://www.ticra.com/papers/combining-gtd-mom-analysing-scattering-licef-antennas-smos-satellite (2016-05-01)
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  • Scattering from a Low-Orbiting Satellite with Rotating Solar Array | TICRA
    The radiation patterns of satellite antennas may be highly influenced by scattering in the satellite its payload and its solar array By ray tracing techniques GO GTD and applying orbit predicting data it is shown how it is possible to model the link signal to a given earth station taking into account that the solar array follows the direction to the sun and thus is rotating relative to the body

    Original URL path: http://www.ticra.com/papers/scattering-low-orbiting-satellite-rotating-solar-array (2016-05-01)
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  • Scattering From a Low-Orbiting Satellite with Rotating Solar Array | TICRA
    Reflector antenna Scattering Scattering From a Low Orbiting Satellite with Rotating Solar Array Abstract The radiation patterns of satellite antennas may be highly influenced by scattering in the satellite its payload and its solar array By ray tracing techniques and ap plying orbit data it is shown how it is possible to model the link signal to a given earth station taking into account that the solar array follows the

    Original URL path: http://www.ticra.com/papers/scattering-low-orbiting-satellite-rotating-solar-array-0 (2016-05-01)
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  • Modelling of Compact Range Quiet-Zone Fields by PO and GTD | TICRA
    range reflectors are designed not to radiate into the quiet zone As a consequence the edges of the range reflectors are complicated to model electromagnetically In the present paper we compare modelling by physical optics PO with modelling by the uniform geometrical theory of diffraction GTD The investigation is carried out on a double reflector range with rectangular serrated reflectors It is found that the range far field determined by

    Original URL path: http://www.ticra.com/papers/modelling-compact-range-quiet-zone-fields-po-and-gtd (2016-05-01)
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