archive-com.com » COM » T » TICRA.COM

Total: 410

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • 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://www.ticra.com/papers/accurate-technique-calculation-radiation-printed-reflectarrays (2016-05-01)
    Open archived version from archive

  • 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://www.ticra.com/papers/accurate-fitting-noisy-irregular-beam-data-planck-space-telescope (2016-05-01)
    Open archived version from archive

  • 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://www.ticra.com/papers/analysis-printed-reflectarrays-using-extended-local-periodicity (2016-05-01)
    Open archived version from archive

  • 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://www.ticra.com/papers/feed-array-design-presence-strong-scattering-reflectors (2016-05-01)
    Open archived version from archive

  • 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://www.ticra.com/papers/new-developments-electromagnetic-data-exchange (2016-05-01)
    Open archived version from archive

  • 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://www.ticra.com/papers?page=10 (2016-05-01)
    Open archived version from archive

  • 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://www.ticra.com/papers/latest-achievements-reconfigurable-reflector-antennas-modelling (2016-05-01)
    Open archived version from archive

  • Improved Source Reconstruction Technique for Antenna Diagnostics | TICRA
    Abstract 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 measured near or far fields and the method therefore allows antenna engineers to perform antenna diagnostics by inspection of extreme near fields or antenna currents The new method provides higher accuracy and is more robust against noise than previously published

    Original URL path: http://www.ticra.com/papers/improved-source-reconstruction-technique-antenna-diagnostics (2016-05-01)
    Open archived version from archive



  •