Single-Source Surface Integral Equation Formulations for Characteristic Modes of Fully Dielectric-Coated Objects

Huang, Shaode; Pan, Jin; Luo, Yuyue; Yang, Dan

doi:10.1109/tap.2019.2911318

Cited by 18 publications

(8 citation statements)

References 21 publications

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“…To ensure that the results of FEKO are immune from spurious modes, we set the equivalent sources of dielectric regions as volumetric currents in FEKO. The results of FEKO are taken as the reference solution, because of its well-known ability to give the reliable modal solutions, despite its heavy computational burden [15]. The five objects represent five different types of electromagnetic structures: 1) Fully dielectric-coated metal 2) Fully dielectric-coated dielectric bodies 3) Dielectric bodies partially coated with metal 4) Multiple metals with one dielectric body 5) Multiple dielectric bodies with one metal…”

Section: Numerical Resultsmentioning

confidence: 99%

“…However, the MS curves obtained from the formulations of [16] are not similar with those of the proposed formulations. It is because that the formulations of [16] sometimes result in spurious modes, as reported in [15]. Note that the MS of the higher-order modes is slightly different between the FEKO and the proposed methods.…”

Section: A Fully Dielectric-coated Metalmentioning

confidence: 93%

“…Based on (5) and (36) in [10], it is found that (15) in which P rad and P reac represent the radiated power and reactive power, respectively. Finally, we have 1 2…”

Section: B Cms Formulationsmentioning

confidence: 99%

“…It is caused by the relatively coarse mesh used in FEKO. The VIE is used to model the dielectric regions in FEKO to ensure that the results are reliable [15]. We have to choose a relatively coarse mesh in FEKO to decrease the unknowns because that a fine mesh of the VIE requires huge memories which exceeds the maximum memory of our computer.…”

Section: A Fully Dielectric-coated Metalmentioning

confidence: 99%

“…The formulations of [13] are only valid for the objects with separated metallic and dielectric parts. The formulations in [14], [15] can be only applied to the fully dielectric-coated objects. The formulations of [16], [17] are applicable to arbitrarily composite metallic-dielectric objects.…”

Section: Introductionmentioning

confidence: 99%

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Alternative Surface Integral Equation-Based Characteristic Mode Formulations for Composite Metallic-Dielectric Objects

et al. 2020

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The characteristic modes (CMs) analysis can give physical insights into the intrinsic mechanisms of radiating structures. To obtain the CMs of composite metallic-dielectric objects is a very challenging task. Existing formulations encounter some problems in calculating the CMs of multiple and multi-layer composite structures. In this paper, we present two new surface integral equation (SIE) formulations for the calculation of CMs of composite metallic-dielectric objects. Employing the contact-region modeling (CRM) technique and the inherent dependent relationships between various kinds of equivalent sources, we propose two new SIE-based CM formulations wherein the electric or magnetic currents on the surfaces of dielectric regions are alternatively involved to suppress spurious modes. Compared to the existing formulations, the proposed formulations are easier to be extended to multiple and multi-layer composite structures. Numerical results of five representative structures are presented to validate the accuracy of the proposed formulations. INDEX TERMS Surface integral equation (SIE), characteristic modes (CMs), contact-region modeling (CRM), composite metallic-dielectric objects.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: A Fully Dielectric-coated Metalmentioning

confidence: 93%

“…Based on (5) and (36) in [10], it is found that (15) in which P rad and P reac represent the radiated power and reactive power, respectively. Finally, we have 1 2…”

Section: B Cms Formulationsmentioning

confidence: 99%

Section: A Fully Dielectric-coated Metalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Alternative Surface Integral Equation-Based Characteristic Mode Formulations for Composite Metallic-Dielectric Objects

et al. 2020

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Fast analysis of scattering from metallic‐dielectric composite large antenna arrays using characteristic modes

Zhou

Chen

Yang

2021

Int J Numerical Modelling

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In this article, characteristic modes for metallic‐dielectric composite structures (MDCS) are explored for fast and accurate analysis of scattering from large antenna arrays. Specifically, a generalized eigenvalue equation is formulated from a method of moments (MoM) impedance matrix of the electric field integral equation and Poggio, Miller, Chang, Harrington, Wu, and Tsai formulation. Modal currents for an antenna element with MDCS are then used as entire domain basis functions in the MoM for expanding equivalent currents over a large antenna array with MDCS. Only a small number of the modal currents are required to approximate the induced current over the antenna array with sufficient accuracy. Thus, the number of the unknowns and the corresponding CPU time in the MoM are significantly reduced in the proposed method. Furthermore, as the periodicity and intrinsic relationship of the matrix elements are considered when using the modal currents as entire domain basis functions, the computational efficiency of the proposed method is further improved. Numerical results of typical antenna arrays with MDCS are presented to illustrate the efficiency and accuracy of the proposed method.

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Unified Implementation and Cross-Validation of the Integral Equation-Based Formulations for the Characteristic Modes of Dielectric Bodies

et al. 2020

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Theory of characteristic modes (TCM) can provide physical insight into the radiation mechanism of arbitrarily-shaped electromagnetic objects. However, how to compute the characteristic modes (CMs) of different structures is still an open problem. Even for the calculation of CMs of an isolated dielectric body, there are eleven integral equation (IE)-based formulations which result in different modal solutions. Such kind of non-uniqueness of solutions makes CMs community confused. One of the objectives of this paper is to outline the differences among all existing IE-based formulations for the CMs of dielectric bodies. The existing formulations are briefly reviewed and carefully compared. We present a procedure to implement the different formulations in a unified manner. Then, we make a complete comparison of the numerical results of existing methods for a dielectric cylinder, which also serves as cross-validation for these approaches. We hope that this paper will help researchers understand the calculation of CMs of dielectric bodies and explore the computation methods of CMs for more complex objects.

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Single-Source Surface Integral Equation Formulations for Characteristic Modes of Fully Dielectric-Coated Objects

Cited by 18 publications

References 21 publications

Alternative Surface Integral Equation-Based Characteristic Mode Formulations for Composite Metallic-Dielectric Objects

Alternative Surface Integral Equation-Based Characteristic Mode Formulations for Composite Metallic-Dielectric Objects

Fast analysis of scattering from metallic‐dielectric composite large antenna arrays using characteristic modes

Unified Implementation and Cross-Validation of the Integral Equation-Based Formulations for the Characteristic Modes of Dielectric Bodies

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