Antenna Pattern Reconstruction Directly From Nonredundant Near-Field Measurements Collected by a Cylindrical Facility

D’Agostino, Francesco; Ferrara, Flaminio; Gennarelli, Claudio; Gennarelli, Gianluca; Guerriero, Rocco; Migliozzi, and Massimo

doi:10.2528/pierm12050207

Cited by 4 publications

(7 citation statements)

References 18 publications

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“…1-D CCNFFFT is derived from the formula of the cylindrical scanning [3] on the assumption that the variation of the cylindrical mode coefficients along the z-axis is negligible [1]. This means that the antenna height is lower than about a wavelength when the antenna long axis is set in the horizontal plane.…”

Section: A 1-d Cirlular Near-field Far-field Transformationmentioning

confidence: 99%

“…To make a 3-D pattern of the antenna using 1-D CNFFFT, we apply the OSI expansion [2,3] to the far-field patterns on several cut planes. Before applying the OSI expansion, we convert the coordinate system in Fig.1 to the one in Fig.…”

Section: B Far-field Optimal Sampling Interpolation Expansionmentioning

confidence: 99%

“…If we have the m-th far-field cut-plane complex pattern F θ (θ, φ m ) (m=1 … 2Mn''), the far-field complex pattern F θ (θ, φ) at any φ is written as [3] …”

Section: B Far-field Optimal Sampling Interpolation Expansionmentioning

confidence: 99%

“…The meaning of each symbol is given in [3]. Each value is determined by only the antenna size and the frequency.…”

Section: B Far-field Optimal Sampling Interpolation Expansionmentioning

confidence: 99%

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3-D absolute gain pattern measured by 1-D circular near-field to far-field transformation applied to elongated antennas as base-station antennas

Hirose

Nakano

Kurokawa

2015

2015 IEEE Conference on Antenna Measurements &Amp; Applications (CAMA)

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We propose a novel 3-D absolute gain pattern measurement method using 1-D circular near-field to far-field transformation (1-D CNFFFT) for elongated antennas such as base-station antennas. By combining a few 1-D cut plane patterns and the far-field optimal sampling interpolation (OSI) expansion, we can obtain the 3-D absolute gain pattern. In experiment for a base station antenna at 2 GHz band, we demonstrate that the 3-D absolute gain pattern measured by the propose method agrees well with the 3-D pattern measured by the conventional cylindrical near-field scanning.

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Section: A 1-d Cirlular Near-field Far-field Transformationmentioning

confidence: 99%

Section: B Far-field Optimal Sampling Interpolation Expansionmentioning

confidence: 99%

“…If we have the m-th far-field cut-plane complex pattern F θ (θ, φ m ) (m=1 … 2Mn''), the far-field complex pattern F θ (θ, φ) at any φ is written as [3] …”

Section: B Far-field Optimal Sampling Interpolation Expansionmentioning

confidence: 99%

“…The meaning of each symbol is given in [3]. Each value is determined by only the antenna size and the frequency.…”

Section: B Far-field Optimal Sampling Interpolation Expansionmentioning

confidence: 99%

See 2 more Smart Citations

3-D absolute gain pattern measured by 1-D circular near-field to far-field transformation applied to elongated antennas as base-station antennas

Hirose

Nakano

Kurokawa

2015

2015 IEEE Conference on Antenna Measurements &Amp; Applications (CAMA)

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“…An efficient two-dimensional OSI formula, obtained by choosing the spiral step equal to the sample spacing needed to interpolate the data along a meridian curve (radial line, generatrix, and meridian), allows one to recover the NF data required to perform the NF-FF transformation using the corresponding classical scanning. Moreover, in order to match the advantages of the direct cylindrical NF-FF transformation [30,31] with those own of the fast helicoidal scan, direct NF-FF transformations with helicoidal scanning, which allow one to evaluate the antenna far field in any cut plane directly from a minimum set of NF data without interpolating them, have been recently proposed in [32,33].…”

Section: Introductionmentioning

confidence: 99%

Far-Field Reconstruction From Near-Field Data Acquired via a Fast Spherical Spiral Scan: Experimental Evidences

D’Agostino¹,

Ferrara²,

Gennarelli

et al. 2013

PIER

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Abstract-A probe-compensated near-field-far-field (NF-FF) transformation with spherical spiral scanning, which makes possible to lower the number of needed measurements, as well as the time required for the data acquisition when characterizing quasi-planar antennas, is experimentally verified in this paper. Such a technique, based on the nonredundant representation of electromagnetic fields, has been achieved by properly applying the unified theory of spiral scans for nonspherical antennas and adopting a very flexible source modelling, formed by two circular "bowls" with the same aperture diameter but different bending radii. A two-dimensional optimal sampling interpolation formula allows one to reconstruct the NF data at any point on the measurement sphere and, in particular, at those required by the classical NF-FF transformation with spherical scanning. The reported NF and FF reconstructions, obtained from the nonredundant samples acquired on the spiral, assess the accuracy of the proposed technique.

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Far-Field Pattern Reconstruction from Near-Field Data Collected via a Nonconventional Plane-Rectangular Scanning: Experimental Testing

D’Agostino

Colibus

Ferrara

et al. 2014

International Journal of Antennas and Propagation

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This paper deals with the experimental validation of an efficient near-field-far-field (NF-FF) transformation using the planar wide-mesh scanning (PWMS). Such a nonconventional plane-rectangular scanning technique is so named, since the sample grid is characterized by meshes wider and wider when going away from the center, and makes it possible to lower the number of needed measurements, as well as the time required for the data acquisition when dealing with quasi-planar antennas. It relies on the use of the nonredundant sampling representations of electromagnetic fields which employ an oblate ellipsoid or a surface formed by two circular “bowls” with the same aperture diameter but eventually different bending radii to shape a quasi-planar antenna. A two-dimensional optimal sampling interpolation formula allows the reconstruction of the NF data at any point on the measurement plane and, in particular, at those required by the classical NF-FF transformation with the conventional plane-rectangular scanning. The measurements, performed at the planar NF facility of the antenna characterization laboratories of Selex ES, have confirmed the effectiveness of this innovative scanning also from the experimental viewpoint.

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Antenna Pattern Reconstruction Directly From Nonredundant Near-Field Measurements Collected by a Cylindrical Facility

Cited by 4 publications

References 18 publications

3-D absolute gain pattern measured by 1-D circular near-field to far-field transformation applied to elongated antennas as base-station antennas

3-D absolute gain pattern measured by 1-D circular near-field to far-field transformation applied to elongated antennas as base-station antennas

Far-Field Reconstruction From Near-Field Data Acquired via a Fast Spherical Spiral Scan: Experimental Evidences

Far-Field Pattern Reconstruction from Near-Field Data Collected via a Nonconventional Plane-Rectangular Scanning: Experimental Testing

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