Fast Far-Field Estimation Method by Compact Single Cut Near-Field Measurements for Electrically Long Antenna Array

Sugimoto, Yoshiki; Arai, Hiroyuki; Maruyama, Toshiyuki; Nasuno, Masahiko; Hirose, Masanobu; Kurokawa, Syuhei

doi:10.1109/tap.2018.2869230

Cited by 18 publications

(9 citation statements)

References 21 publications

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“…Single cut near-to-far-field transforms have been performed, with successful examples, in literature. These are based on a variety of different transformation techniques including: cylindrical wave expansion [3], [4], [5], [6] , linear equivalent electric current [7] , singular value optimisation [8] and 3D Green's function [9] . The single cut near-to-far-field transforms explored in this work are based on the cylindrical wave expansion (CWE) as these techniques have the same measurement requirements as the 2D spherical measurements taken in the NPL range already.…”

Section: Near To Far Field Transformation Theorymentioning

confidence: 99%

Single cut near to far-field antenna transform

Smith¹,

Knight²

2022

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Section: Near To Far Field Transformation Theorymentioning

confidence: 99%

Single cut near to far-field antenna transform

Smith¹,

Knight²

2022

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“…This is a reasonable assumption as most of the manufacturing errors affect the feeding network, as compared to the single element which usually has a rather simple quasi-omnidirectional pattern. This is a recurrent topic of single cut measurement techniques so one should be aware of the limitations as discussed in [ 8 , 9 , 10 , 11 ]. As a general guideline, the higher directivity in the array plane, the single cut measurement becomes more accurate, because the array factor dominates the individual element pattern.…”

Section: Potential and Limitations Of The Sct-mpmsmentioning

confidence: 99%

“…Furthermore, this problem becomes even worse when validating arrays with beam-steering capabilities so more than one FF radiation pattern is acquired per AUT. In this context, it is convenient to lose some accuracy in exchange of a measurement time reduction by performing a one-by-one Single-Cut Transformation (SCT) [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…In [ 8 ] spherical and cylindrical wave expansions are used to perform NF to FF transformations over rings enclosing the AUT, with good agreement with full spherical measurements. An equivalent currents approach is proposed in [ 9 ] to predict the full FF radiation pattern of long linear arrays. Applying some approximations, the FF is predicted only by measuring the AUT in a line parallel to the array and a perpendicular ring enclosing it, both in the reactive-field region.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Probe Measurement System Based on Single-Cut Transformation for Fast Testing of Linear Arrays

Varela

Morales

Sanchez

et al. 2021

Sensors

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This paper introduces a near-field measurement system concept for the fast testing of linear arrays suited for mass production scenarios where a high number of nominally identical antennas needs to be measured. The proposed system can compute the radiation pattern, directivity and gain on the array plane, as well as the array complex feeding coefficients in a matter of seconds. The concept is based on a multi-probe antenna array arranged in a line which measures the near field of the antenna under test in its array plane. This linear measurement is postprocessed with state-of-the-art single-cut transformation techniques. To compensate the lack of full 3D information, a previous complete characterization of a “Gold Antenna” is performed. This antenna is nominally identical to the many ones that will be measured with the proposed system. Therefore, the data extracted from this full characterization can be used to complement the postprocessing steps of the single-cut measurements. An X-band 16-probe demonstrator of the proposed system is implemented and introduced in this paper, explaining all the details of its architecture and operation steps. Finally, some measurement results are given to compare the developed demonstrator with traditional anechoic measurements, and show the potential capabilities of the proposed concept to perform fast and reliable measurements.

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“…Furthermore, single-cut far field patterns can significantly reduce the NF measurement time. Much effort has been made to investigate the possibility of obtaining single-cut FF patterns from NF measurement data [17][18][19][20][21]. In this work, the objective is to investigate whether we can accurately reconstruct the single-cut FF pattern of the AUT in a cost-effective anechoic chamber setup equipped only with a few probe antennas.…”

Section: Introductionmentioning

confidence: 99%

Single-cut Far-Field Antenna Radiation Pattern Reconstruction Accuracy Analysis in Compact Anechoic Chamber Setup

Jensen¹,

Ji²,

Zhang³

et al. 2021

ACES

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In production testing, it is of importance to measure the key radiation parameters of an antenna under test (AUT), e.g., main beam peak and direction, sidelobes, and null depth and direction in a cost-effective setup with a short measurement time. As a result, practical measurement setups are often compact and equipped with only a few probes (or probe locations). However, these system limitations would introduce errors for antenna testing. This problem has become even more pronounced for 5G radios due to utilization of large-scale antenna configurations and high frequency bands. Spherical near-field measurements are nowadays an accurate and mature technique for characterizing AUTs, which however, necessitates a full spherical acquisition, leading to a long measurement time. Singlecut near-to-far-field transformation is a promising strategy since most of the key AUT parameters are available in the single-cut pattern and it requires much reduced measurement time. In this work, a simple and flexible scheme is proposed to evaluate errors introduced by limitations in practical setups for single-cut far-field (FF) antenna radiation pattern reconstruction, where the near-field data can be easily generated and modified according to the limitations introduced in practical multiprobe anechoic chamber setups, e.g., measurement distance, truncation range, and sampling interval. The reconstructed FF pattern is obtained using a commercial near-field to far-field transformation tool, SNIFT. The proposed scheme is numerically validated via comparing the reference FF pattern of a 4 × 8 uniform planar array composed of ideal Hertzian dipoles and reconstructed FF pattern. With the proposed scheme, the impact of practical system limitations on single-cut reconstruction accuracy can be easily analyzed.Index Terms ─ Antenna pattern measurement, nearfield far-field transformation, near field measurement, over-the-air testing, and single-cut antenna pattern.

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Fast Far-Field Estimation Method by Compact Single Cut Near-Field Measurements for Electrically Long Antenna Array

Cited by 18 publications

References 21 publications

Single cut near to far-field antenna transform

Single cut near to far-field antenna transform

Multi-Probe Measurement System Based on Single-Cut Transformation for Fast Testing of Linear Arrays

Single-cut Far-Field Antenna Radiation Pattern Reconstruction Accuracy Analysis in Compact Anechoic Chamber Setup

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