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".
  • Properties of the Transformation from the Spherical Wave Expansion to the Plane Wave Expansion | TICRA
    of the Transformation from the Spherical Wave Expansion to the Plane Wave Expansion Abstract The transformation between the spherical wave expansion SWE and the plane wave expansion PWE is investigated with respect to a range of its fundamental properties First the transformation of individual spherical waves is studied in order to understand how these contribute to the different regions of the plane wave spectrum Second the number of spherical waves

    Original URL path: http://www.ticra.com/papers/properties-transformation-spherical-wave-expansion-plane-wave-expansion (2016-05-01)
    Open archived version from archive


  • Dynamic Link Improvements using a Reconfigurable Reflector Antenna | TICRA
    Optics Reflectarray Reflector antenna Scattering Dynamic Link Improvements using a Reconfigurable Reflector Antenna Abstract This paper demonstrates that adapting the reflector surface shape of a spacecraft antenna according to the actual weather situation can reduce the transponder power margin by as much as 6 dB The computer time required to calculate a new scenario is about 30 seconds The range of the setting of the actuators to obtain the different

    Original URL path: http://www.ticra.com/papers/dynamic-link-improvements-using-reconfigurable-reflector-antenna (2016-05-01)
    Open archived version from archive

  • Papers | TICRA
    calculation is based on a calculation of the radial electric and magnetic field 18 Jun 1995 A Study on the Isolation Capability of Multi Beam Reflector Antennas Authors Hans Henrik Viskum The paper demonstrates how multi beam antennas used for contoured beams in communications satellites are capable of providing very high isolation to adjacent service areas even with antenna 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 19 Jun 1994 Dual Offset Shaped Reflectors Optimized for Gain and XPD performance Authors Hans Henrik Viskum Stig Busk Sørensen Contoured beam antennas may conveniently be designed by shaping the reflector surface to produce a gain pattern which closely resembles the prescribed coverage area The most appropriate technique 01 Oct 1993 Shaped Beam Antennas Reflector Surface Tolerance Effects Authors Knud Pontoppidan Stig Busk Sørensen The effects of reflector surface distortions for a paraboloidal pencil beam reflector antenna are well understood The peak gain reduction is proportional to the surface error squared whereas the 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 28 Jun 1993 Electrical design of the INTELSAT VIII S1 Ku band spot beam antenna Authors Hans Henrik Viskum The INTELSAT VIII spacecraft will carry two steerable spot beam antennas for operation in the Ku band 10 95 12 75 GHz Tx 14 0 14 5 GHz Rx thereby continuing the success INTELSAT has had 01 Dec 1989 Creeping Wave Modes

    Original URL path: http://www.ticra.com/papers?page=12 (2016-05-01)
    Open archived version from archive

  • Computation of Radiation from Wire Antennas on Conducting Bodies | TICRA
    theoretical formulation in terms of combined mag netic and electric field integral equations is presented for the class of electromagnetic problems in which one or more wire antennas are connected to a conducting body of arbitrary shape The formula tion is suitable for numerical computation provided that the overall dimensions of the structure are not large compared to the wavelength A computer program is described and test runs on various

    Original URL path: http://www.ticra.com/papers/computation-radiation-wire-antennas-conducting-bodies (2016-05-01)
    Open archived version from archive

  • Papers | TICRA
    systematic or random Typical examples of each of these types of surface distortions are presented and their 11 Jun 1986 Shortcomings of cross polarisation methods for reflector antennas Authors Hans Henrik Viskum The still increasing requirements to satellite reflector antennas in particular with respect to such parameters as cross polarisation and side lobe level imply a demand for fast and accurate 10 Jun 1986 Synthesis and analysis of single shaped reflector antennas Authors Hans Henrik Viskum Although geometrical optics GO is an asymptotic theory describ ing electromagnetic fields of infinitely high frequencies only it has for several years constituted the foundation for synthesis 01 Jun 1985 Shaping of Dual Reflector Antennas for Improvement of Scan Performance Authors Niels Christian Albertsen Knud Pontoppidan Stig Busk Sørensen Modern communications satellites are equipped with high gain re flector antennas with contoured beams for various purposes A con toured beam of complex cross section is generated by exciting 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 reflector antenna system It is demonstrated that the physical optics PO solution 01 Oct 1983 Nonlinear Transformations for Accelerating the Convergence of M Dimensional Series Authors Niels Christian Albertsen Stig Busk Sørensen Two transformations for accelerating the convergence of infinite M dimensional series are presented They are generalizations of Shanks e transformation and Levin s one dimensional 01 Aug 1983 A Compact Septum Polarizer Authors Niels Christian Albertsen A waveguide polarizer with resonant notches in a septum is investigated The Wiener Hopf technique is employed to derive theoretical design data and the results are compared to experiments for a 01 May 1977 Caustics and Caustic Corrections to the Field Diffracted by a

    Original URL path: http://www.ticra.com/papers?page=13 (2016-05-01)
    Open archived version from archive

  • GRASP | TICRA
    for several reflector shapes and materials Mathematical and numerical measured feed definitions Near field and far field calculations of vector fields Flexible analysis approach enables the calculation of individual scattering components of the radiated field Highly efficient PO algorithms GTD and optional moment method solver Increased productivity through efficient project file handling Several optional add ons see links in the left pane Many R D projects have contributed to new

    Original URL path: https://www.ticra.com/products/software/grasp (2016-05-01)
    Open archived version from archive

  • CHAMP | TICRA
    the rookie while still giving the expert access to an incredible array of features to thoroughly optimize your antenna system Rule based wizards for setup of conical corrugated horns and ring focus reflector systems Component library for easy design of axial corrugations choke ring waveguides and dual depth corrugations conical horns Easy definition of horn exterior geometry Analysis of dielectric material for example as used between the feed aperture and the sub reflector Assignment of variables to geometric parameters including arithmetic and trigonometric expressions Smooth formulation of optimization goals in terms of familiar antenna parameters including return loss directivity XPD co and cross polar side lobe envelope templates and phase center location See a real example CHAMP combines a mode matching solver for the propagation internally in the horn with a highly efficient BoR MoM solver for the exterior parts including reflectors and dielectric support material The BoR solver was developed specifically for this application with the aim of optimizing speed and rendering practical optimization A full analysis cycle for a typical antenna system takes less than a few seconds Analysis of terminal antenna with compact feed and stepped subreflector CHAMP generates GRASP and POS compatible spherical wave expansions to

    Original URL path: https://www.ticra.com/products/software/champ (2016-05-01)
    Open archived version from archive

  • SATSOFT | TICRA
    assess antenna coverage and gain conduct antenna trade off studies develop shaped beam and multibeam antenna designs and perform other satellite payload engineering tasks SATSOFT is written for the systems engineer as well as the antenna specialist SATSOFT provides users with just a basic knowledge of antennas a tool that can be used very productively Advanced tools will appeal to the antenna specialist If you need software to model satellite

    Original URL path: https://www.ticra.com/products/software/satsoft (2016-05-01)
    Open archived version from archive



  •