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  • Papers | TICRA
    technique is employed in an investigation of the antenna system in the Microwave Imaging 04 Nov 2007 Application of the SWE to PWE Antenna Diagnostics Technique to an Offset Reflector Antenna Authors Cecilia Cappellin A new antenna diagnostics technique has been developed for the DTU ESA Spherical Near Field Antenna Test Facility at the Technical University of Denmark The technique is based on the 04 Nov 2007 Polarisation Dependent Scattering from the Serrations of Compact Ranges Authors Frank Jensen Serrations are often applied at the edges of compact range reflectors in order to reduce the scattering from the edges into the quiet zone At low frequencies the serrations show different 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 The Influence of Finite Measurement Accuracy on the SWE to PWE Antenna Diagnostics Technique Authors Cecilia Cappellin A new antenna diagnostics technique based on the transformation of the spherical wave expansion SWE into the plane wave expansion PWE is proposed The new technique allows the recovery of the 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 31 May 2005 A High Resolution Antenna Diagnostics Technique for Spherical Near Field Measurements Authors Cecilia Cappellin A new diagnostics technique for spherical near field antenna measurements that

    Original URL path: http://ticra.com/papers?page=9 (2016-05-01)
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  • An Accurate Technique for Calculation of Radiation From Printed Reflectarrays | TICRA
    and an improved technique based on the equivalent currents approach is proposed The equivalent currents are found from a continuous plane wave spectrum calculated by use of the spectral dyadic Green s func tion This ensures a correct relation between the equivalent elec tric and magnetic currents and thus allows an accurate calcula tion of the radiation over the entire far field sphere A comparison to DTU ESA Facility measurements

    Original URL path: http://ticra.com/papers/accurate-technique-calculation-radiation-printed-reflectarrays (2016-05-01)
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  • Accurate Fitting of Noisy Irregular Beam Data for the Planck Space Telescope | TICRA
    of the Planck space telescope geometry Therefore a novel two step fit ting algorithm which focuses on the spatial dependency of the in flight measurements has been implemented To reduce both the noise and the size of the dataset a spatial filter is applied without reducing the amount of pat tern information Thereafter a Kriging fitting is performed providing a smooth model with a significant noise level reduction As a

    Original URL path: http://ticra.com/papers/accurate-fitting-noisy-irregular-beam-data-planck-space-telescope (2016-05-01)
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  • Analysis of Printed Reflectarrays Using Extended Local Periodicity | TICRA
    Extended Local Periodicity Abstract An analysis technique for improved modeling of a printed reflectarray is proposed The technique is based on a periodic approach where periodicity is applied on an extended unit cell which includes the actual elements surrounding the element under consideration An offset reflectarray sample has been manufactured and measured and comparison of simulations and measurements is presented to verify the proposed technique Available on IEEEXPLORE Publication Proceedings

    Original URL path: http://ticra.com/papers/analysis-printed-reflectarrays-using-extended-local-periodicity (2016-05-01)
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  • Feed-Array Design in Presence of Strong Scattering From Reflectors | TICRA
    interacting radiating structures e g arrays coming into the reflector field of view can be a difficult task for a single tool which is typically not able to manage multi scale sub problems This communication addresses the feasibility of a procedure for the design of feed arrays in presence of strong scattering from the reflector or any other nearby structure The particular and novel feature is how using the best

    Original URL path: http://ticra.com/papers/feed-array-design-presence-strong-scattering-reflectors (2016-05-01)
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  • New developments of the Electromagnetic Data Exchange | TICRA
    funded under EU FP6 and ESA TRP budgets Since the end of ACE the development continues in the Working Group on Software of the European Association on Antennas and Propagation EurAAP in close cooperation with the EAML partners The key issues in the recent developments have been a vastly improved interface to MATLAB and so called companion tools which enable easy browsing of EDX files and graphical visualization of the

    Original URL path: http://ticra.com/papers/new-developments-electromagnetic-data-exchange (2016-05-01)
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  • Papers | TICRA
    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 17 Oct 2004 On the Number of Modes in Spherical Wave Expansions Authors Frank Jensen Since the early days of spherical near field far field transformations a recommendation for the necessary number of polar modes has been given by N kr o 10 being the 24 Jun 2003 Shaped single offset DBS reception antenna for multiple satellites Authors Hans Henrik Viskum A direct approach to the design of a multi focal antenna system for the reception from several satellites along the orbital arc is presented The method is based on optimising the reflector shape 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 22 Jun 2003 Electrical properties of triaxially woven fabrics for reflector antennas Authors Knud Pontoppidan Hans Henrik Viskum 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 15 Apr 2003 Corrective Subreflectors for Millimetre and Sub Millimetre Wave Applications Authors Hans Henrik Viskum A mechanically controllable reflector has been manufactured by using an electroformed Nickel shell supported and controlled by 19 actuators If such a system is used as subreflector in a 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

    Original URL path: http://ticra.com/papers?page=10 (2016-05-01)
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  • Latest Achievements on Reconfigurable Reflector Antennas Modelling | TICRA
    future space applications The reflector surface consists of an RF net made by thin interwoven piano wires This net provides the necessary reflectivity at Ku band frequencies The RF net is very soft and it is therefore supported by a thicker net of the same construction The reflector is shaped by means of a number of actuators across the surface The paper presents accurate mechanical Finite Element Method calculations to

    Original URL path: http://ticra.com/papers/latest-achievements-reconfigurable-reflector-antennas-modelling (2016-05-01)
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