Coupling of Characteristic Modes on PEC and Lossy Dielectric Structures

Volume integral equation (VIE) and surface integral equation (SIE) based characteristic mode (CM) formulations are investigated in the case of lossy objects. Imperfectly conducting metallic structures modelled with an impedance boundary condition and lossy dielectric bodies are considered. Two types of CM formulations are studied. In the first one, the generalized eigenvalue equation is expressed in terms of the Hermitian parts of the integral operators. In the second one, the weighting operator of the eigenvalue equation is defined so that the eigenvectors form a weighted orthogonal set, weighted with respect to radiated power. The first approach gives real eigensolutions and is found to lead to clustering of the eigenvalues as losses are increased. From these solutions it is difficult to separate contributions of radiated, reactive, and dissipated power. This separation appears naturally in the second approach that gives complex eigensolutions. As applications including lossy materials, CM analyses of a graphene sheet and a plasmonic nanoparticle are presented.

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“…In SIO formulations, this can be expressed using the imaginary part of complex Poynting vector, indicating that the contribution of

{boldE}_{normaln}^{int}

should vanish. In VIO formulations, however, the contribution of the interior fields in Equation may be nonzero.…”

Section: Characteristic Modesmentioning

confidence: 99%

Theory of characteristic modes for lossy structures: Formulation and interpretation of eigenvalues

Ylä‐Oijala

Wallén

Järvenpää

2019

Int J Numerical Modelling

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“…Therefore, we begin by shortly introducing the theoretical background of the applied CMA method. More details of the method can be found in [21]. Other types of CMA formulations for combined PEC and dielectric structures are introduced, e.g., in [27].…”

Section: Characteristic Mode Analysis With the Usermentioning

confidence: 99%

“…This is particularly important for bodies having high dielectric constant and being also highly lossy, such as the human body [20]. Recently we have shown that CMA can be reliably applied for the analysis of combined PEC (antenna) and lossy dielectric (user) structures [21]. The obtained eigensolutions provide separation of the loss and radiation power, thus, allowing simultaneous study of the radiation properties and loss mechanism of the structure.…”

Section: Introductionmentioning

confidence: 99%

Designing Hand-Immune Handset Antennas With Adaptive Excitation and Characteristic Modes

Luomaniemi

Ylä‐Oijala

Lehtovuori

et al. 2021

IEEE Trans. Antennas Propagat.

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“…Recently, the TCM is extended to the composite metallicdielectric objects using the SIE approach [13]- [17]. The formulations in [13] are direct combinations of classical TCM formulation for conducting bodies [3] and the TCM formulation for dielectric bodies [12]. The formulations of [13] are only valid for the objects with separated metallic and dielectric parts.…”

Section: Introductionmentioning

confidence: 99%

“…The formulations in [13] are direct combinations of classical TCM formulation for conducting bodies [3] and the TCM formulation for dielectric bodies [12]. 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.…”

Section: Introductionmentioning

confidence: 99%

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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Coupling of Characteristic Modes on PEC and Lossy Dielectric Structures

Cited by 36 publications

References 32 publications

Theory of characteristic modes for lossy structures: Formulation and interpretation of eigenvalues

Theory of characteristic modes for lossy structures: Formulation and interpretation of eigenvalues

Designing Hand-Immune Handset Antennas With Adaptive Excitation and Characteristic Modes

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

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