Near-Field Antenna Measurements

Калашников, Вадим Серафимович; Ponomarev, Maxim Yurievich; Platonov, Oleg Yurievich; Shubnikov, Victor Vasilievich; Rivkin, Mark Ilyich; Shatrakov, A Y; Shatrakov, Y G; Zavalishin, O I

doi:10.1007/978-981-33-6436-3

Cited by 2 publications

(2 citation statements)

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“…It is noted that two compromises between time and relative error are made. The choice of the best ordered-subset selection algorithm involves the first trade-off with the figure of merit defined by (16), while the second trade-off is made to determine the optimal n 0 with a merit function defined in (17). Moreover, a comparison of near-field patterns with four beams acquired by the proposed sampling method and uniform sampling is presented.…”

Section: E Performance Analysismentioning

confidence: 99%

“…Since MIMO technology with beamforming is critical in IoT environments, it is necessary to analyze its performance by measuring near-field patterns of antennas. Spherical nearfield sampling is a common way to obtain near-field samples (NFSs) of base-station antennas on a fully enclosed surface, so it can show the radiation characteristics of antennas at various angles of the scan area, including the back of antennas [16]. Currently, the maximal spherical sampling angular interval is commonly decided based on the Nyquist sampling theorem, but it is time-consuming to acquire NFSs by uniform sampling [17].…”

Section: Introductionmentioning

confidence: 99%

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Model-Driven Compressive Spherical Array Sampling of Base-Station-Antenna Near Field Using Accelerated Pseudo-Skeleton Tensor Approximation

Sun¹,

Wu²,

Zhang³

et al. 2023

Preprint

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<p>Spherical array sampling plays an important role in obtaining near-field samples (NFSs) of base-station antennas for wireless internet of things performance analysis and optimization. Due to the large sampling area that a semicircular array of probes (SAP) has to cover, spherical array sampling is often time-consuming. In order to reduce sampling time, this paper proposes a model-driven compressive spherical array sampling technique based on pseudo-skeleton tensor approximation. In the proposed method, the Huygens’ principle and the method of moments are applied to construct a mapping tensor firstly, which relates the vector consisting of Huygens’ equivalent source samples with the matrix constituted by spherical near-field samples. Then by analyzing the physical meaning of the mapping tensor, it is revealed that skeleton sampling positions of SAP could be obtained by searching skeleton slices of the mapping tensor. The skeletonization process provides the relationship between NFSs in skeleton and non-skeleton sampling positions. This means NFSs in non-skeleton sampling positions can be computed from those in skeleton sampling positions, and the sampling effort is thus reduced. Moreover, in order to efficiently search skeleton slices of the mapping tensor, a fast ordered-subset selection algorithm is developed. Numerical experiments show that the proposed sampling method can reduce the number of samples by 50%, and the proposed fast algorithm is 22 times faster than traditional algorithms from the perspective of computation efficiency. Since the proposed sampling method is model-driven, it is independent of sampling data, which makes the method attractive to multi-beam multiple-input multiple-output (MIMO) antennas.</p>

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Section: E Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model-Driven Compressive Spherical Array Sampling of Base-Station-Antenna Near Field Using Accelerated Pseudo-Skeleton Tensor Approximation

Sun¹,

Wu²,

Zhang³

et al. 2023

Preprint

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Verification of Phase Shifter Measurements of a Reflective Array Antenna

Parnes

2021

Izv. vysš. učebn. zaved. Ross., Radioèlektron.

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Introduction. Large-size phased antenna arrays (PAA) frequently incorporate optical excitation schemes, whose main elements include the feed and the reflective aperture. In turn, the reflective aperture consists of several tens of thousands of radiators and phase shifters. Major distortions of the radiation pattern in reflective arrays occur due to phase errors, leading to a decrease in the gain and an increase in the side lobes of the radiation pattern. In the millimeter wavelength range, ferrite phase shifters can have an initial phase from 0 to 360 °, thus requiring measurements of the array elements following their assembly.Aim. To develop a method for evaluating errors in measurements of the parameters of phase shifters incorporated in an antenna array by comparing theoretical and experimental data.Materials and methods. A convenient method for determining the parameters of phase shifters is probing, in which a movable probe is connected in series with each array element. In cases where a PAA element represents a single structure consisting of a ferrite segment and a dielectric radiator, measurements are carried out using a probe in the form of a segment of a round waveguide moving towards the radiator. In order to evaluate the measurement error of such a scheme, a mechanically controlled reference phase shifter was used.Results. Measurement errors for the probe structure used were calculated based on the assumption of the phase error arising from the vector addition of the controlled and uncontrolled reflected signals at the input of the PAA element, in the section of the reference plane at the input of the probe. In addition, the S-parameters of the superposition section were calculated. The extrema of the error function were used to determine the maximum errors in measuring the phase and amplitude.Conclusion. The performed analysis confirmed the validity of the proposed method for measuring the parameters of phase shifters using a waveguide probe. The measurement error of the PAA elements according to the proposed scheme was found to be about 3 o, which is commensurate with that of recording devices.

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Near-Field Antenna Measurements

Cited by 2 publications

References 0 publications

Model-Driven Compressive Spherical Array Sampling of Base-Station-Antenna Near Field Using Accelerated Pseudo-Skeleton Tensor Approximation

Model-Driven Compressive Spherical Array Sampling of Base-Station-Antenna Near Field Using Accelerated Pseudo-Skeleton Tensor Approximation

Verification of Phase Shifter Measurements of a Reflective Array Antenna

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