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  • A Singularity Extraction Technique for Computation of Antenna Aperture Fields from Singular Plane Wave Spectra | TICRA
    effective technique for extracting the singularity of plane wave spectra in the computation of antenna aperture fields is pro posed The singular spectrum is first factorized into a product of a finite function and a singular function The finite function is inverse Fourier transformed numerically using the Inverse Fast Fourier Transform while the singular function is inverse Fourier transformed analytically using the Weyl identity and the two resulting spatial functions

    Original URL path: http://ticra.com/papers/singularity-extraction-technique-computation-antenna-aperture-fields-singular-plane-wave (2016-05-01)
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  • 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://ticra.com/papers/properties-transformation-spherical-wave-expansion-plane-wave-expansion (2016-05-01)
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  • 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://ticra.com/papers/dynamic-link-improvements-using-reconfigurable-reflector-antenna (2016-05-01)
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  • 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://ticra.com/papers?page=12 (2016-05-01)
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  • 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://ticra.com/papers/computation-radiation-wire-antennas-conducting-bodies (2016-05-01)
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  • 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://ticra.com/papers?page=13 (2016-05-01)
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  • News | TICRA
    becomes part of the TICRA software product line 28 Oct 2014 AMTA 2014 Student Paper Award Oscar Bories pursuing his Ph D 12 Sep 2014 TICRA at AMTA 2014 Visit our booth 12 in the Tucson Ballroom and hear about the latest developments at TICRA 18 Jun 2014 CHAMP 3 1 0 Release We are happy to announce the release of CHAMP 3 1 0 Besides the usual weeding out of a few bugs this version brings major new features to assist you in your horn and reflector terminal design 1 May 2014 EuCAP 2014 a great success On Friday April 11 the Chairman of the EuCAP 2014 could make the closing remarks and everyone would look back on a very successful week 11 Apr 2014 Oscar is honored at the final day of EuCAP2014 Oscar Borries working on his doctoral thesis at TICRA was awarded the 2 nd price for the best Student Paper award at this year s EuCAP 27 Mar 2014 Get ready for EuCAP 2014 TICRA are happy to be Platinum sponsors at this years EuCAP conference to be held in The Hague from April 6 12 21 Feb 2014 GRASP 10 3 released The new

    Original URL path: http://ticra.com/news/this.href%2C?page=1 (2016-05-01)
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  • News | TICRA
    AMTA 2013 6 11 October The preparations for AMTA are well under way and as usual we will participate with a booth and a couple of papers Visit us at Booth no 27 Aug 2013 35th ESA Antenna Workshop This years antenna workshop at Estec titled Antenna and Free 7 Aug 2013 PIERS 2013 Stockholm The 34th PIERS will be held between August 12 15 in Stockholm Sweden 5 Jul 2013 GRASP 10 2 released The new release of GRASP introduces a number of new features Here are some of the more interesting 2 Jul 2013 AP S Symposium 2013 The Antennas and Propagation International Symposium kicks off next week in Orlando Florida 1 May 2013 TICRA signs major contract with ESA TICRA has signed a contract with ESA s research and technology centre ESTEC which will pave the way for a future prediction tool able to assess radiation patterns and interference effects of mult 19 Apr 2013 Reflector antenna course at AP S 2013 Don t miss the opportunity to learn about reflector antennas at the IEEE International Symposium on Antennas and Propagation The event is held in sunny Orlando during the week 7 12 July 3 Apr 2013

    Original URL path: http://ticra.com/news/this.href%2C?page=2 (2016-05-01)
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