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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://ticra.com/papers/diagnostics-smos-radiometer-antenna-system-dtu-esa-spherical-near-field-antenna-test-facility (2016-05-01)

Open archived version from archive - 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://ticra.com/papers/application-swe-pwe-antenna-diagnostics-technique-offset-reflector-antenna-0 (2016-05-01)

Open archived version from archive - 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://ticra.com/papers/influence-finite-measurement-accuracy-swe-pwe-antenna-diagnostics-technique (2016-05-01)

Open archived version from archive - 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://ticra.com/papers/high-resolution-antenna-diagnostics-technique-spherical-near-field-measurements (2016-05-01)

Open archived version from archive - A High-Resolution Antenna Diagnostics Technique for Spherical Near-Field Antenna Measurements | TICRA

spherical near field antenna measurements that is able to provide a high resolution of the reconstructed aperture field in excess of existing techniques is presented This is realized by using a transformation from the spherical wave expansion SWE determined from measurements to the plane wave expansion PWE recovering in this way also part of the invisible region of the plane wave spectrum By inverse Fourier transform OFT the aperture field

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

Open archived version from archive - Higher Order Hierarchical Legendre Basis Functions for Electromagnetic Modeling | TICRA

Reflector antenna Scattering Higher Order Hierarchical Legendre Basis Functions for Electromagnetic Modeling Abstract This paper presents 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 modified to impose continuity of vector quantities between neighboring elements while maintaining most of their desirable features Expressions are presented for wire surface and volume elements but emphasis is given to the surface elements In this case the new hierarchical basis leads to a near orthogonal expansion of the unknown surface current and implicitly an orthogonal expansion of the surface charge In addition all higher order terms in the expansion have two vanishing moments In contrast to existing formulations these properties allow the use of very high order basis functions without introducing ill conditioning of the resulting MoM matrix Numerical results confirm that the condition number of the MoM matrix obtained with this new basis is much lower than existing higher order interpolatory and hierarchical basis functions As a consequence of the excellent condition numbers we demonstrate that even very high order MoMsystems e g tenth order can be solved efficiently with an iterative solver in relatively

Original URL path: http://ticra.com/papers/higher-order-hierarchical-legendre-basis-functions-electromagnetic-modeling (2016-05-01)

Open archived version from archive - Electrical analysis of light-weight, triangular weave reflector antennas | TICRA

requires accurate electromagnetic modelling of the reflector surface properties In particular the new tri axially woven fibre skins are of interest In a recent study for ESTEC a new computer program has been developed in a co operation between TICRA and Politecnico di Torino The name of the program is MESTIS MEtallic STrIps Simulator and by means of this it is possible to model one or more layers of strip

Original URL path: http://ticra.com/papers/electrical-analysis-light-weight-triangular-weave-reflector-antennas (2016-05-01)

Open archived version from archive - Creeping Wave Modes for a Dielectric Coated Cylinder | TICRA

a Dielectric Coated Cylinder Abstract The spectrum of creeping waves that can exist on the sur face of a dielectric coated cylinder is determined by the poles in the Green s function for the cylinder Accounts of the position of these poles may be found in the literature but a number of poles appear so far to have been overlooked Although these poles may be of little interest for practical

Original URL path: http://ticra.com/papers/creeping-wave-modes-dielectric-coated-cylinder (2016-05-01)

Open archived version from archive