Near-Field to Far-Field Transformation on Arbitrary Surfaces via Multi-Level Spherical Wave Expansion

Varela, F.; Iragüen, Belén Galocha; Silva, Manuel

doi:10.1109/tap.2019.2935108

Cited by 12 publications

(3 citation statements)

References 36 publications

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“…Based on measurements with helical scans, the authors in [21] investigated the application of non-uniform fast Fourier transforms in SNFT. A recently proposed method based on recursive partitioning in a multi-level subdomain hierarchy of radiating surfaces is applied to arbitrary surface measurements [22]. The authors in [23][24][25] described the adaptive method to reduce the measurement burden spherical near-field measurements.…”

Section: Introductionmentioning

confidence: 99%

Combined Application of Partition Clustering Classification and Gerchberg-Papoulis Optimization Algorithm for Spherical Near Field Antenna Measurements

Peng

Ren

et al. 2023

ACES Journal

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An adaptive sampling and optimized extrapolation scheme for spherical near-field antenna testing is proposed. The method relies on the partition clustering classification algorithm and Voronoi classification to divide a small amount of initial data into subclasses and cells. The sampling density and rates of variation between adjacent sampling points are used as an overall metric function to evaluate the sampling dynamics at each location. Appropriate interpolation is performed in the highly dynamic region to increase the effective data in the near-field samples. The Gerchberg-Papoulis algorithm extrapolates the unnecessary interpolation region to improve the near-field sampling accuracy. This method uses a small amount of initial near-field sampled data for near-far field conversion to achieve the same precision as uniform oversampling. The feasibility and stability of the algorithm are proved from the actual measurement results.

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Section: Introductionmentioning

confidence: 99%

Combined Application of Partition Clustering Classification and Gerchberg-Papoulis Optimization Algorithm for Spherical Near Field Antenna Measurements

Peng

Ren

et al. 2023

ACES Journal

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“…The antenna radiation pattern measurements with different test ranges are well investigated in the literature, e.g. direct far-field [8], compact antenna testing range [9], plane wave generator [10], near-field [11], and mid-field methods [12].…”

Section: Introductionmentioning

confidence: 99%

A Fast Multibeam Measurement Method for Millimeter-Wave Phased Arrays

Gao

Zhang

Pedersen

et al. 2022

Antennas Wirel. Propag. Lett.

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Accurate knowledge of multi-beam radiation patterns of millimeter-wave (mmWave) phased arrays is key to mmWave radio system performance. The multi-beam radiation patterns can be measured by conventional antenna test ranges in a sequential manner. However, these tasks can be time-consuming and low-efficient in practice, especially for large-scale arrays with many beam-steering states. To address this problem, this article proposes a multi-beam reconstruction method, which can measure all possible steered beams in a fast and efficient manner. In the proposed method, multiple beam patterns are reconstructed synchronously by a fast element pattern retrieving method based on a few sparse measurement samples, which were obtained in a multi-probe setup or with the help of a turntable in a single probe setup. The proposed method is experimentally validated in a compact antenna testing range (CATR) setup at 28 GHz for a 4 × 4 mmWave phased array with an integrated antenna-in-package (AiP) design. The experimental results show that the reconstructed array multi-beam patterns by the proposed method are comparable to the conventional CATR measurement results but in a faster way, which validates the effectiveness of the proposed method.

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“…The most advanced testing procedures rely on near-field measurement techniques that consist of measuring the field radiated by the antenna under test at a relatively short range within an anechoic environment [1][2][3] and then to compute the far-field pattern from such measurements. More in detail, near-field measurements are usually collected by mechanically scanning a measurement surface [4] and then the measured data are processed by the so-called "near-field to far-field transformations" [3,[5][6][7], or related approaches [8,9], to obtain the antenna radiation pattern. For large antennas, the number of required measurements may become extremely high.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Warping Sampling Scheme for Broad-Side Antenna Characterization

2020

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In this paper the problem of sampling the field radiated by a planar source observed over a finite planar aperture located in the near-field is addressed. The problem is cast as the determination of the spatial measurement positions which allow us to discretize the radiation problem so that the singular values of the radiation operator are well-approximated. More in detail, thanks to a suitably warping transformation of the observation variables, the kernel function of the relevant operator is approximated by a band-limited function and hence the sampling theorem applied to achieved discretization. It results in the sampling points having to be non-linearity arranged across the measurement aperture and their number can be considerably lowered as compared to more standard sampling approach. It is shown that the proposed sampling scheme works well for measurement apertures that are not too large as compared to the source’s size. As a consequence, the method appears better suited for broad-side large antenna whose radiated field is mainly concentrated in front of the antenna. A numerical analysis is included to check the theoretical findings and to study the trade-off between the field accuracy representation (over the measurement aperture) and the truncation error in the estimated far-field radiation pattern.

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Near-Field to Far-Field Transformation on Arbitrary Surfaces via Multi-Level Spherical Wave Expansion

Cited by 12 publications

References 36 publications

Combined Application of Partition Clustering Classification and Gerchberg-Papoulis Optimization Algorithm for Spherical Near Field Antenna Measurements

Combined Application of Partition Clustering Classification and Gerchberg-Papoulis Optimization Algorithm for Spherical Near Field Antenna Measurements

A Fast Multibeam Measurement Method for Millimeter-Wave Phased Arrays

Near-Field Warping Sampling Scheme for Broad-Side Antenna Characterization

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