A comparison of different methods for fast single-cut near-to-far-field transformation [euraap corner]

Mosig, J. R.; Cornelius, Rasmus; Salmerón-Ruiz, T.; Saccardi, F.; Foged, L. J.; Heberling, Dirk; Silva, Manuel

doi:10.1109/map.2014.6837096

Cited by 29 publications

(12 citation statements)

References 5 publications

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“…FDTD requires that the analysis region be surrounded by a free reflection computational boundary; we choose Perfectly Matched Layer model (PML) for our application as in [9,10]. Equations (1)(2)(3)(4) show the present field components.…”

Section: Finite Difference Time Domain Methods (Fdtd)mentioning

confidence: 99%

“…Comparing with commercial software, we reduce computational re-sources and the proposed method has been used to transform near-field into far-field from real measurements [1]. The method requires knowing the electric field near to reflector surface; this data can be obtained from measurements as [3][4][5][6] or by field modeling in the Rayleigh region as in [7], for this purpose, we implement a model based on FDTD method in order to obtain the magnitude and phase of field in a small region, near to the reflector surface. Descriptions of FDTD, discrete Pocklington equation and parabolic array factor (PAF) are presented in following Subsecs.…”

Section: Introductionmentioning

confidence: 99%

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Near field analysis and field transformation applied to a parabolic profile at 5GHz

et al. 2019

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We proposed a method of analysis and field transformation is applied to a 1.5 m diameter parabolic reflector at a frequency of 5 GHz, an antenna of these dimensions requires at least a 75 m region to obtain its radiation pattern, and this represents a problem, here arises the necessity to make field transformations like the one presented in this work. Near field is modeled by means of Finite Difference Time Domain Method (FDTD) and current distribution is obtained using the discrete Pocklington equation. Radiation pattern is calculated applying the array factor for parabolic profiles. Results are compared with those obtained by CST Microwave Studio with a very good agreement.

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Section: Finite Difference Time Domain Methods (Fdtd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Near field analysis and field transformation applied to a parabolic profile at 5GHz

et al. 2019

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“…The cylindrical near-field measurement is the most commonly adopted technique for a base station antenna as it is suitable to transform a fan beam pattern. Reducing the time of measurement and calculation, an antenna is crucial for nearfield measurements [6]. There are some presented methods that resolve this problem.…”

Section: Introductionmentioning

confidence: 99%

“…Processing time achieved is minimized by limiting the measurement data and the estimate plane. In literature [6], [8], methods to reconstruct far-field accurately by circular one cut measurements and cylindrical modes transformation are shown. However, in most cases, it is difficult to rotate the AUT to measure the broadside directivity of the long aperture AUT.…”

Section: Introductionmentioning

confidence: 99%

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

Sugimoto

Arai

Maruyama³

et al. 2018

IEEE Trans. Antennas Propagat.

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This article proposes a fast far-field estimation method of electrically long antenna in compact measurement space. The presented method estimates a far-field pattern on an orthogonal cut plane from the linear equivalent electric current and circular current distribution. The equivalent electric current data is measured in a reactive near-field region using a small loop probe. In the proposed method, the linear equivalent current distribution is extended by a simple numerical extrapolation formula for improving the accuracy of the estimated far-field in the broadside direction. In the horizontal plane, the far-field pattern is calculated from both the circular equivalent electric and magnetic distribution approximating equivalent magnetic current with equivalent electric current. We confirmed the validity of the proposed method from the numerical simulation and measurements results. The method allows accurate directivity measurement in a small space in about a few minutes.

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“…Cornelius et al presented in [9] the comparison of results using three different algorithms: this last algorithm, the one based on the Fourier series decomposition and one implemented by R. Cornelius based on the spherical wave expansion of the measurement in one cut. That paper analysed the advantages and drawbacks of each of the three methods, concluding that the method based on cylindrical mode expansion was more appropriate since it could work directly with the full ring and included probe correction.…”

Section: Introductionmentioning

confidence: 99%

Gain antenna measurement using single cut near field measurements

Silva

Saccardi

Foged

2016

AMTA 2016 Proceedings

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Abstract-Some antennas require rapid validation at a reduced measurement distance while maintaining sufficient accuracy in the determination of pertinent antenna parameters such as gain. In particular, for cellular base station antennas in production phase the measurement time can be a limitation. In these cases, a rapid check of the radiation performance in the two main planes is sufficient. Other examples are phase arrays with high degree of steering that would require considerable measurement time for characterizing all steering positions. This paper presents a near-field antenna test procedure providing single or double main plane patterns including the gain. The procedure is applicable to antennas, with separable excitation in the two main planes. The test set-up is based on an azimuth positioner and near to far-field transformation based on expansion in cylindrical modes. The paper shows results for gain measurements. Near to far-field transformation is performed using the cylindrical modes expansion assuming a zero-height cylinder. This allows the use of a FFT in the calculation of the far field pattern including probe correction. In the case of gain, the near to far-field transformation factor is calculated for bore sight direction, taking advantage of the separable excitation properties of the antenna. This factor is used in the gain calculation by comparison technique.

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A comparison of different methods for fast single-cut near-to-far-field transformation [euraap corner]

Cited by 29 publications

References 5 publications

Near field analysis and field transformation applied to a parabolic profile at 5GHz

Near field analysis and field transformation applied to a parabolic profile at 5GHz

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

Gain antenna measurement using single cut near field measurements

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