Efficient Characteristic Mode Analysis for Radiation Problems of Antenna Arrays

Guan, Ling; He, Zi; Ding, D. Z.; Chen, R. S.

doi:10.1109/tap.2018.2876705

Cited by 34 publications

(22 citation statements)

References 21 publications

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“…After postprocessing, the eigenvalues were shown to agree with the ones of the VIO formulation giving real eigenvalues. Recently, several alternative CM formulations have been proposed for homogeneous dielectric bodies as well as for combined PEC and lossless dielectric structures . However, only Miers and Lau and Ylä‐Oijala et al consider lossy cases.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, several alternative CM formulations have been proposed for homogeneous dielectric bodies [17][18][19][20][21] as well as for combined PEC and lossless dielectric structures. [22][23][24][25] However, only Miers and Lau 16 and Ylä-Oijala et al 21 consider lossy cases. As pointed out in Guo et al, 22 a major challenge related to the CM formulation for lossy structures is the separation of dissipated power from radiated and reactive power.…”

Section: Introductionmentioning

confidence: 99%

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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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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Especially, delays of 3 m and 4 m are hardly seen. J2, J3, and J5 yield lossless transmission behaviors, which belong to DMs and can be described by (9). J4 and J6 are CMs, in which the radiation loss is significant and hence they yield lossy transmission behaviors.…”

Section: Td-cma Of Dual-wire Transmission Linesmentioning

confidence: 99%

“…HARACTERISTIC mode analysis (CMA) attracts extensive attentions for guiding the antenna design, mutual coupling suppression, radiation pattern synthesis, and other emerging applications [1][2][3][4][5]. Theory of characteristic modes (TCM) was established in the frequency domain, i.e., the time-harmonic framework [6][7][8][9]. The eigenvalues and eigencurrents are computed at each single frequency, and a broadband response is obtained by proper mode tracking [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Time Domain Characteristic Mode Analysis for Transmission Problems

Wen

2020

IEEE Open J. Antennas Propag.

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Characteristic mode analysis (CMA) is based on time-harmonic electromagnetics and applied mostly in frequency domain. In this paper, CMA is extended to time domain (TD) for transmission problems. Based on the modal self-and mutual-admittance of two-port systems, the modal TD response is obtained using inverse fast Fourier transform, extrapolation and Hilbert transform. TD-CMA represents modal impulse response on specified ports, and impulse response of the system is the linear superposition of the modal ones. Numerical examples are provided to explain this new concept. For a pair of parallel wires, the calculated TD-CMA is alike the common and differential modes. For a pair of dipoles, TD-CMA can be divided into strong and weak coupling modes according to their magnitudes. The strong coupling modes are due to the pulse radiation and oscillations at dipole tips and feedings. Time delay paths are clearly observed in the near field but are not discernable in the intermediate field. This shows different coupling mechanisms for the two cases. TD-CMA expands research field of CMA and may find applications for analyzing transient behaviors of microwave systems.

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“…The characteristic mode (CM) theory was firstly proposed by Garbacz in 1965 [17] and further reformulated by Harrington and Mautz in 1971 [18]. The characteristic mode analysis has attracted considerable attention in design and optimization of antennas [19]- [20], because it provides not only a clear physical insight into radiation behavior but also information of significant radiation modes that can be excited. It also has been applied for design and analysis of multiport networks such as antenna arrays [21], the metasurface resonator antennas [22], platform mounted antennas [23] and also aircraft-integrated multiband multiantenna systems [24].…”

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confidence: 99%

Miniaturized-Element Frequency-Selective Rasorber Design Using Characteristic Modes Analysis

Guo

et al. 2020

IEEE Trans. Antennas Propagat.

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A dual-polarization frequency-selective rasorber with two absorptive bands at both sides of a passband is presented. Based on the characteristic mode analysis, a circuit analog absorber is designed using a lossy FSS that consists of miniaturized meander lines and lumped resistors. The positions and values of resistors are determined according to the analysis of modal significances and modal current. After that, the presented rasorber is designed by cascading of the lossy FSS and a lossless bandpass FSS. Equivalent circuits of the frequency-selective rasorber are modelled, and surface current distributions of both FSSs are illustrated to explain the operation mechanism. Measurement results show that, under the normal incidence, a minimum insertion loss of 0.27 dB is achieved at a passband around 6 GHz, and the absorption bands with an absorption rate higher than 80% are 2.5 to 4.6 GHz in the lower band and 7.7 to 12 GHz in the higher band, respectively. Our results exhibit good agreements between measurements and simulations.

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Efficient Characteristic Mode Analysis for Radiation Problems of Antenna Arrays

Cited by 34 publications

References 21 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

Time Domain Characteristic Mode Analysis for Transmission Problems

Miniaturized-Element Frequency-Selective Rasorber Design Using Characteristic Modes Analysis

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