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  • Multilevel Fast Multipole Method for Higher Order Discretizations | TICRA
    higher order HO discretization is demonstrated on high frequency HF problems illustrating for the first time how an efficient MLFMM for HO can be achieved even for very large groups Applying several novel ideas beneficial to both lower order and higher order discretizations results from a low memory high speed MLFMM implementation of a HO hierarchical discretization are shown These results challenge the general view that the benefits of HO

    Original URL path: http://www.ticra.com/papers/multilevel-fast-multipole-method-higher-order-discretizations (2016-05-01)
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  • Improved Multilevel Fast Multipole Method for Higher-Order Discretizations | TICRA
    MLFMM allows for a reduced computational complexity when solving electromagnetic scattering problems Combining this with the reduced number of unknowns provided by Higher Order discretizations has proven to be a difficult task with the general conclusion being that going above 2nd order is not worthwhile In this paper we challenge this conclusion providing results that demonstrate the potential performance gains with Higher Order MLFMM and showing some modifications to the

    Original URL path: http://www.ticra.com/papers/improved-multilevel-fast-multipole-method-higher-order-discretizations-0 (2016-05-01)
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  • Application of Advanced Field-Reconstruction Algorithms | TICRA
    A general accurate and efficient stand alone commercial program for antenna diagnostics DIATOOL has been developed by TICRA The software reconstructs the field or the equivalent currents on a plane or an arbitrary 3D surface enclosing the antenna The fundamental properties of the underlying field reconstruction techniques have been reported previously and the paper therefore focuses on the capabilities of the developed software by considering two test cases where real

    Original URL path: http://www.ticra.com/papers/application-advanced-field-reconstruction-algorithms (2016-05-01)
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  • Advanced Processing of Measured Fields using Field Reconstruction Techniques | TICRA
    contribution deals with the problem of reconstructing the extreme near field of an antenna starting from the field measured at a larger distance The presented method has several applications including but not limited to antenna diagnostics suppression of spurious contributions from the measurement system or artificial removal the currents flowing on mounting structures or cables The capabilities are illustrated by processing of field data obtained from spherical near field measurements

    Original URL path: http://www.ticra.com/papers/advanced-processing-measured-fields-using-field-reconstruction-techniques (2016-05-01)
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  • Latest Achievements in Antenna Diagnostics and Processing of Measured Fields | TICRA
    on the antenna surface From the inspection of the extreme near field or currents the program will solve typical antenna diagnostics problems such as identification of array element failure and antenna surface errors but also allow artificial removal of undesired contributions such as currents on cables and fixtures thereby saving valuable time and resources in the antenna design and validation process The program will be based on two field reconstruction

    Original URL path: http://www.ticra.com/papers/latest-achievements-antenna-diagnostics-and-processing-measured-fields (2016-05-01)
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  • Papers tagged with : Near field | TICRA
    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 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 can provide a high spatial resolution of the reconstructed aperture field is presented This technique is realized 08 Nov 2004 A High Resolution Antenna Diagnostics Technique for Spherical Near Field Antenna Measurements Authors Cecilia Cappellin A new antenna diagnostics technique for spherical near field antenna measurements that is able to provide a high resolution of the reconstructed aperture field in excess of existing techniques 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 01 Feb 1987 The SNFGTD Method and its Accuracy Authors Hans Henrik Viskum The spherical near field geometrical theory of diffraction SNFGTD method is an extended aperture method by which the near field from

    Original URL path: http://www.ticra.com/papers/11?page=1 (2016-05-01)
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  • Design of Multi-Faceted Dual-Polarization Dual-Coverage Contoured Beam Reflectarray | TICRA
    Reflectarray Reflector antenna Scattering Design of Multi Faceted Dual Polarization Dual Coverage Contoured Beam Reflectarray Abstract The design and optimization of a single layer multifaceted dual polarization contoured beam reflectarray with different coverages in each polarization has been presented The reflectarray is optimized using a direct optimization technique to produce a contoured beam for a European coverage in H polarization and a contoured beam for Brazilian coverage in V polarization

    Original URL path: http://www.ticra.com/papers/design-multi-faceted-dual-polarization-dual-coverage-contoured-beam-reflectarray (2016-05-01)
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  • Design and Optimization of Multi-Faceted Reflectarrays for Satellite Applications | TICRA
    Physical Optics Reflectarray Reflector antenna Scattering Design and Optimization of Multi Faceted Reflectarrays for Satellite Applications Abstract The design and optimization of multi faceted reflectarrays for satellite applications are presented The objective of this work is to investigate the performance of a multi faceted reflectarray designed using a direct optimization technique To this end a single layer multi faceted reflectarray that produces a contoured beam for a European coverage in a bandwidth of 17 has been designed The performance is compared to that of a planar reflectarray as well as a shaped reflector In the considered frequency range the co polar minimum directivity within the coverage of the multi faceted reflectarray surpasses that of its planar counterpart with more than 1 dB Compared to the shaped reflector the difference between the co polar minimum directivity of the multi faceted reflectarray and the shaped reflector is only 0 3 dB To improve the cross polar radiation of the multifaceted reflectarray cross polar suppression is included in the optimization and the minimum cross polar discrimination of the optimized reflectarray is improved with 2 3 dB without any degradation of the co polar radiation Publication Proc EuCAP 2014 The 8th European Conference on

    Original URL path: http://www.ticra.com/papers/design-and-optimization-multi-faceted-reflectarrays-satellite-applications (2016-05-01)
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