Numerical and Experimental Assessment of Source Reconstruction for Very Near-Field Measurements With an Array of $H$ -Field Probes

Kiaee, Ali; Alavi, Rezvan Rafiee; Mirzavand, Rashid; Mousavi, Pedram

doi:10.1109/tap.2017.2776339

Cited by 24 publications

(5 citation statements)

References 26 publications

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“…Then, the transfer function T , which relates the electromagnetic fields on the measurement plane to the current elements on the fictitious source plane, is obtained by using (6). Following the surface currents calculations by using (7), the fields can be estimated on any desired observation planes via (5).…”

Section: Formulating the Problemmentioning

confidence: 99%

“…Therefore, a robust tool is needed to predict the electromagnetic fields in different observation planes concerning the noise source location. The source noise can be modeled using equivalent surface current elements, which can be subsequently used to calculate the electromagnetic fields on a specified observation plane inside the product [6], [7], [8], whose location can be arbitrary. Source reconstruction is a powerful tool for estimating the electromagnetic fields in any arbitrary observation plane by utilizing the data captured from a specific observation plane.…”

Section: Introductionmentioning

confidence: 99%

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Inverse MoM Approach to Near-Field Prediction and RFI Estimation in Electronic Devices With Multiple Radiating Elements

2023

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An inverse method of moments (MoM) approach is developed to estimate the equivalent electric/magnetic current sources to predict radio frequency interference (RFI) in electronic devices. The proposed method is designed to reconstruct the noise sources in electronic devices containing multiple radiating elements by using a finite metal object carrying electric surface currents. The surface current elements are further applied to calculate the electromagnetic fields on arbitrary observation planes near the device under test (DUT). The method is validated through numerical simulation examples, including electrictype CPU noise, magnetic-type non-planar HDMI connector noise, printed circuit board (PCB) with Wi-Fi and PIFA antennas, and heat sink embedded in the DUT. The results confirm less than 0.4 dB difference in the predicted pattern at the antenna operating frequency when a triangular segmentation is applied in the vicinity of the noise source area, and the equivalent surface current is calculated at the edges of the Rao-Wilton-Glisson (RWG) meshes. The proposed method is a promising 'source reconstruction' candidate for predicting the near-field radiation characteristics of electronic devices with multiple peaks and nulls in the near-field radiation pattern. The method helps estimate the level of RFI by summing up the contributions of all the dipoles of the equivalent noise source derived by solving forward and inverse problems. The RFI results based on the inverse MoM approach are validated by comparing them with those obtained from CST simulation, and good agreement is achieved between the two.

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Section: Formulating the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inverse MoM Approach to Near-Field Prediction and RFI Estimation in Electronic Devices With Multiple Radiating Elements

2023

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show abstract

“…(4) The field-distribution F C calculated by dipole source is given in Fig.19 (b). (5) The error between F and F C is calculated and provided in Table 8.…”

Section: E Application In Complex Electric Circuitmentioning

confidence: 99%

“…There are many methods used to extract the equivalent source of a device under test (DUT) based on near-field data. A widely used method is to create an equivalent surface current source based on integral functions and Green's function [5]. As mentioned in [6], a super-resolution source reconstruction method is investigated with free space Green's function.…”

Section: Introductionmentioning

confidence: 99%

An Improved Equivalent Dipole Moment Source Model Based on Regularization Optimization Method for Near Field-Far Field Conversion

et al. 2020

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The radiation emission from high-speed digital circuit may result in radio-frequency interference (RFI) problems in modern electronic devices. In this paper, an improved equivalent dipole source based on a new transfer model and a new regularization method is proposed. The equivalent source is obtained by solving an inverse equation with near-field data. The tangential component of electric field used in conventional equivalent source extraction is replaced by the normal component, which can reduce the test difficulty and enhance the measurement efficiency. The new regularization method based on Tikhonov and truncated singular value decomposition (TSVD) can enhance the stability and accuracy of the dipole solution. In addition, the new transfer model and regularization method are verified by simulations and measurements.

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“…Various efficient electromagnetic sampling algorithms, such as sparse sampling [11]- [14], compressed sensing [15]- [18], and adaptive sampling [19], nonredundant sampling [20], [21], have been proposed to improve the efficiency of probe scanning method by reducing the number of sampling points. Fixed probes arrays [22]- [25] also have been introduced to improve the efficiency, but the resolution is limited by the size of the fixed probe. Complex and expensive array systems are only in exchange for efficiency increases under special measurement conditions, such as limited frequencies or limited imaging areas.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Diagnosis of Antenna Radiation Characteristics Based on Scanning Optic-Induced Plasma Scattering Technology

Leng

Jin

et al. 2023

IEEE Trans. Antennas Propagat.

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This paper presents an innovative quasi-real-time antenna near-field diagnosis method, by scanning a laser induced plasma on a silicon wafer and imaging the field with the synchronously produced scattered signals. Several approaches have been devised to adapt to the antenna diagnosis scenarios. By using the multilayer matching approach, the issue of multiple reflection disturbance between the aperture and silicon wafer is avoided, especially for large aperture antenna at high frequencies. The accuracy of near-field distribution is improved, and far-field patterns can be transformed directly. The experiment results of a Ka-band 20dB standard antenna agree well with the simulation results. Diagnosis of radiation states in the reactive near-field region is demonstrated, and the resonate modes of a 2.4 GHz WiFi patch antenna at different frequencies are clearly observed. The experiments of a TM01 mode antenna verify the full polarization diagnosis ability of the method, and the linear polarization component is measured with the help of a polarization grid. The demonstrated diagnosis method has the advantages of high efficiency, ultra-close measurement distance, super resolution, and provides a highly promising and widely available method for antenna diagnosis.

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Numerical and Experimental Assessment of Source Reconstruction for Very Near-Field Measurements With an Array of $H$ -Field Probes

Cited by 24 publications

References 26 publications

Inverse MoM Approach to Near-Field Prediction and RFI Estimation in Electronic Devices With Multiple Radiating Elements

Inverse MoM Approach to Near-Field Prediction and RFI Estimation in Electronic Devices With Multiple Radiating Elements

An Improved Equivalent Dipole Moment Source Model Based on Regularization Optimization Method for Near Field-Far Field Conversion

High-Efficiency Diagnosis of Antenna Radiation Characteristics Based on Scanning Optic-Induced Plasma Scattering Technology

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