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  • Per Heighwood Nielsen | TICRA
    S B Vesterdal N Viskum H H Zhou M History Papers 08 Jul 2001 Multi Moded Horns in Reflector Antenna Systems 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 10 Sep 2000 Guidelines for the

    Original URL path: http://www.ticra.com/company/staff/per-heighwood-nielsen?page=1 (2016-05-01)
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  • On the use of FFT in surface shaping of contoured beam antennas | TICRA
    FFT in surface shaping of contoured beam antennas Abstract A comparison of the Fast Fourier Transform FFT and direct numerical integration to solve the PO integral is presented with special emphasis on the achieved accuracy and the CPU time consumption The concept of second order FFT is introduced It is shown that the accuracy of FFT is not compatible with the accuracy requirements expected by analysis codes for satellite communication

    Original URL path: http://www.ticra.com/papers/use-fft-surface-shaping-contoured-beam-antennas (2016-05-01)
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  • Analysis of subreflectors for dual reflector antennas | TICRA
    copolar component Significant discrepancies may appear for the crosspolar component and it is necessary to introduce additional fringe currents in the PO solution If the subreflector is located in the near field of the feed special precautions must be taken One can either subdivide the feed aperture into a number of smaller subapertures for each of which standard GTD can be applied or an alternative and more efficient method is

    Original URL path: http://www.ticra.com/papers/analysis-subreflectors-dual-reflector-antennas (2016-05-01)
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  • A Compact Septum Polarizer | TICRA
    Multipole Method Near field Optimization Physical Optics Reflectarray Reflector antenna Scattering A Compact Septum Polarizer Abstract 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 single notch and a double notch design It is concluded that the agreement is good and the design useful for narrowband applications Publication

    Original URL path: http://www.ticra.com/papers/compact-septum-polarizer (2016-05-01)
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  • Diagnostics of the SMOS Radiometer Antenna System at the DTU-ESA Spherical Near-Field Antenna Test Facility | TICRA
    Wave Expansion SWE to PWE antenna diagnostics technique is employed in an investigation of the antenna system in the Microwave Imaging Radiometer using Aperture Synthesis MIRAS for ESA s Soil Moisture and Ocean Salinity SMOS mission The SWE to PWE antenna diagnostics technique successfully identifies the sources of the anomalies detected in 2 of the 138 MIRAS antenna farfield patterns that were measured during the on ground calibration at the

    Original URL path: http://www.ticra.com/papers/diagnostics-smos-radiometer-antenna-system-dtu-esa-spherical-near-field-antenna-test-facility (2016-05-01)
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  • Application of the SWE-to-PWE Antenna Diagnostics Technique to an Offset Reflector Antenna | TICRA
    the radiated field obtained from a spherical near field measurement to the Plane Wave Expansion PWE and it allows an accurate reconstruction of the field in the extreme near field region of the antenna under test AUT including the aperture field While the fundamental properties of the SWE to PWE transformation as well as the influence of finite measurement accuracy have been reported previously we validate here the new antenna

    Original URL path: http://www.ticra.com/papers/application-swe-pwe-antenna-diagnostics-technique-offset-reflector-antenna-0 (2016-05-01)
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  • The Influence of Finite Measurement Accuracy on the SWE-to-PWE Antenna Diagnostics Technique | TICRA
    the spherical wave expansion SWE into the plane wave expansion PWE is proposed The new technique allows the recovery of the plane wave spectrum in the visible region and in principle also in part of the invisible region from data acquired during a spherical near field measurement From the PWE the aperture field can subsequently be calculated While the fundamental properties of the SWE to PWE transformation have been reported

    Original URL path: http://www.ticra.com/papers/influence-finite-measurement-accuracy-swe-pwe-antenna-diagnostics-technique (2016-05-01)
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  • A High-Resolution Antenna Diagnostics Technique for Spherical Near-Field Measurements | TICRA
    measurements that can provide a high spatial resolution of the reconstructed aperture field is presented This technique is realized by transforming the spherical wave expansion SWE of the radiated field into the corresponding plane wave expansion PWE recovering a significant part of the invisible region of the plane wave spectrum Through the inverse Fourier transform IFT the field on a plane outside as well as inside the antenna minimum sphere

    Original URL path: http://www.ticra.com/papers/high-resolution-antenna-diagnostics-technique-spherical-near-field-measurements (2016-05-01)
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