Spherical Equivalent Dipole Array Theory and Its Applications to Complex Electromagnetic System

Jing Nie,Shunchuan Yang,Donglin Su

doi:10.1109/access.2019.2932090

Jing Nie, Shunchuan Yang + Show 1 more

Open Access

https://doi.org/10.1109/access.2019.2932090

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Abstract

The equivalent dipole array is an effective method for emission source modeling to solve practical electromagnetic engineering problems. In this paper, a spherical equivalent dipole array method (SEDAM) is proposed to model practical and complex electronic systems. Unlike the planar equivalent dipole array method (PEDAM), SEDAM is derived in the spherical coordinate system and is more suitable for large electromagnetic equipments. In addition, SEDAM can achieve accurate emission prediction around electronic systems of arbitrary structures, where PEDAM is not easy to be used. We first derived the analytical relationship between magnetic fields and magnetic dipole moments in the spherical coordinate system. To model the complex systems, several equivalent dipoles are properly placed on a spherical surface which encloses the equipment under test (EUT). By superposition of the fields generated by all the equivalent dipoles, the equivalent relational matrix is constructed and the weights for each dipole are solved. Then, the weighted dipole array can be used to predict the emission fields at desired locations. The proposed method is first verified through a numerical simulation. The results show that the proposed SEDAM outperforms the PEDAM in terms of accuracy. It is further validated through a measurement. The measurement results show that SEDAM can model the practical and complex electronic systems and predict their electromagnetic emission with acceptable accuracy.

Highlights

The emission characteristics of complex electronic systems have been becoming increasingly important to identify the electromagnetic compatibility (EMC) issues [1]
The planar equivalent dipole array method (PEDAM) are suitable for modeling in the reactive near-field region with high complexity of data acquisition and large scale of sampling data. They are limited by the size of the scanning plane and can only predict the planar fields distribution outside the scanning plane. To overcome this limitation of the PEDAMs, in this paper, we proposed a spherical equivalent dipole array method (SEDAM) to model complex electronic systems, which is more suitable for the large-scale system compared with the PEDAMs
In order to solve electromagnetic interference source location problems in electronic systems, this paper focuses on the near-field measurement of increasingly complex electronic equipments, and realizes the equivalent modeling with spherical dipole array

Summary

INTRODUCTION

The emission characteristics of complex electronic systems have been becoming increasingly important to identify the electromagnetic compatibility (EMC) issues [1]. The PEDAMs are suitable for modeling in the reactive near-field region with high complexity of data acquisition and large scale of sampling data They are limited by the size of the scanning plane and can only predict the planar fields distribution outside the scanning plane. To overcome this limitation of the PEDAMs, in this paper, we proposed a SEDAM to model complex electronic systems, which is more suitable for the large-scale system compared with the PEDAMs. The proposed method can be used to model in radiation near-field region, which requires less sampling data.

THE THEORY OF BASIC THEORY OF SPHERICAL EQUIVALENT DIPOLE ARRAY

A MIMO RING ANTENNA

COMPARISON WITH THE PEDAM

THE VERIFICATION OF MEASUREMENT

Findings

CONCLUSION