- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Differentiation of the Laser Pulse in a Waveguide with a Bragg Grating
摘要： A novel one-port probe technique, which combines the measurements of a rectangular waveguide and coaxial probe to nondestructively yield the permittivity and permeability of a PEC-backed material, is presented. A brief description of the derivation of the theoretical probe reflection coefficients, necessary for permittivity and permeability extraction via numerical inversion, is provided. Experimental characterization results of a PEC-backed magnetic material are presented to validate the proposed approach. Error analysis is also undertaken to quantify the new technique’s sensitivity to common experimental errors.
关键词： moment methods,microwave measurements,waveguides,Integral equations,permeability measurement,uncertainty,permittivity measurement,measurement uncertainty
更新于2025-09-23 15:21:01
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Efficient Characterization of Topological Photonics Using the Broadband Greena??s Function
摘要： A novel method is developed in this paper to characterize the band diagram and modal ?elds of gyromagnetic photonic crystals that support topolgoical one-way edge states. We exploy an integral equation based method that utilizes the broadband Green’s function as the kernel. The broadband Green’s function is a hybrid representation of the periodic lattice Green’s function that includes an imaginary wavenumber component represented in exponentially decaying spatial series and a reminder in fast converging Floquet plane wave expansions. Special boundary conditions govern the ?elds across the interface of the gyromagnetic scatterers, leading to surface integral equations (SIEs) that involve three components including the pilot ?eld, its normal derivative and its tangential derivative. To reduce the independent number of unknowns, roof-top basis functions and the Garlerkin’s method are used to discretize the SIEs into matrix equations. The broadband Green’s function allows converting the discretized SIEs into a linear eigenvalue problem of a small size. The eigenvalues and eigenvectors of the linear eigenvalue problem are directly related to the band solutions and modal ?elds of the photonic crystal. The proposed approach is an e?ective method to characterize wave interactions with periodic scatterers using integral equations. The solutions of the presented approach are compared against Comsol simulations for various cases to show its accuracy and e?ciency.
关键词： topological photonics,surface integral equations,broadband Green’s function,linear eigenvalue problem,gyromagnetic photonic crystals
更新于2025-09-23 15:21:01
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Fast Solution of Volume-surface Integral Equations for Conducting-anisotropic Media
摘要： Electromagnetic problems with both conducting and anisotropic media are formulated by volume-surface integral equations (VSIEs). The conducting medium is described by a surface integral equation while the anisotropic medium is governed by volume integral equations (VIEs) and they are coupled together via produced fields. The VSIEs are usually solved by the method of moments (MoM) in which the electric current density on the conductor surface is expanded by the Rao-Wilton-Glisson basis function while the volumetric flux densities inside the anisotropic medium are represented by the Schaubert-Wilton-Glisson basis function. In this work, we use a point-matching scheme to discretize the VIEs of dielectric part and couple it with the MoM for the conducting part. We also incorporate the hybrid scheme with the multilevel fast multipole algorithm to accelerate the solving process for electrically large problems. A numerical example is provided to illustrate the approach and good results have been obtained.
关键词： multilevel fast multipole algorithm,Volume-surface integral equations,method of moments,conducting-anisotropic media
更新于2025-09-23 15:21:01
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The Double PEC Wedge Problem: Diffraction and Total Far Field
摘要： Complex scattering targets are often made by structures constituted of wedges that may interact at near field. In this paper, we examine the scattering of a plane electromagnetic wave by two separated arbitrarily oriented perfectly electrically conducting wedges with parallel axes. The procedure to obtain the solution is based on the recently developed semianalytical method known as generalized Wiener–Hopf technique that allows a comprehensive mathematical model of the problem in the spectral domain avoiding multiple steps of interaction among separated objects. The numerical results are presented to validate the procedure in terms of spectral quantities, GTD/uniform theory of diffraction coefficients and total far fields for engineering applications. The structure is of interest in electromagnetic applications, in particular, to accurately predict path loss in propagation with diffraction phenomena.
关键词： electromagnetic diffraction,radar applications,wedges,propagation,electromagnetic shielding,wireless communication,Wiener–Hopf (WH) method,integral equations,EMC,near-field interactions,Antenna technologies
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Some Problems of Modeling the Shock Processes of Relaxed Optics
摘要： Transient interactions on conductive dielectric scatterers are analyzed by solving the Poggio–Miller–Chan–Harrington–Wu–Tsai (PMCHWT) surface integral equation with a marching on-in-time (MOT) scheme. The proposed scheme, unlike the previously developed ones, permits the analysis on scatterers with multiple volumes of different conductivity. This is achieved by maintaining an extra temporal convolution that only depends on permittivity and conductivity of these volumes. Its discretization and computation come at almost no additional cost and do not change the computational complexity of the resulting MOT solver. Accuracy and applicability of the MOT-PMCHWT solver are demonstrated by numerical examples.
关键词： lossy media,transient analysis,dissipative media,marching-on-in-time method,integral equations,Conductive media,PMCHWT formulation,time-domain analysis
更新于2025-09-23 15:19:57
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[IEEE 2018 Asia-Pacific Microwave Conference (APMC) - Kyoto, Japan (2018.11.6-2018.11.9)] 2018 Asia-Pacific Microwave Conference (APMC) - THz Wave Scattering by Graphene Strip Grating Embedded into a Dielectric Slab with PEC Plane
摘要： The scattering of the H-polarized plane electromagnetic wave by a planar graphene grating in the THz range is considered. The grating is embedded into a dielectric slab placed above a perfectly electric conducting plane. The method of singular integral equations is used. To describe the graphene the model of zero-thickness impedance sheet, characterized with surface conductivity via the Kubo formalism is used. Scattering and absorption characteristics are studied.
关键词： gratings,integral equations,graphene
更新于2025-09-19 17:15:36
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A Review on the Application of Integral Equation‐Based Computational Methods to Scattering Problems in Plasmonics
摘要： Many computational methods have been developed and used for modeling, understanding, and tailoring extreme optical effects at the nanoscale. Among them, this review focuses on the integral equation-based methods: within the local response limit, a potential-based boundary integral equation (BIE) formalism and a field-based volume integral equation (VIE) formalism; within the nonlocal hydrodynamic model, a potential-based BIE formalism. These formalisms are derived from macroscopic electrodynamics (together with appropriate constitutive relations). The derivations are based on three pillars: the Green function, the field relation(s) (for the VIE formalism, the incident—scattered—total field relation; for the BIE formalism, the interface conditions connecting the fields at two sides of the interface), and the field equivalence principle (for the VIE formalism, the volume equivalence principle; for the BIE formalism, the Huygens principle). By applying the method of moments (MoM) algorithm, the derived integral equations are converted into matrix equations, with possible problems in the implementation being discussed. Levels of solutions, including the eigenmode and natural mode solutions, and group representation theory are introduced as powerful post-processing steps. Many examples are shown to demonstrate the effectiveness of the reviewed algorithms.
关键词： nonlocal hydrodynamic model,computational electromagnetics,boundary integral equations,plasmonics,volume integral equations
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Raman Response Induces Moving Cavity Solitons in Optical Resonators
摘要： Transient interactions on conductive dielectric scatterers are analyzed by solving the Poggio–Miller–Chan–Harrington–Wu–Tsai (PMCHWT) surface integral equation with a marching on-in-time (MOT) scheme. The proposed scheme, unlike the previously developed ones, permits the analysis on scatterers with multiple volumes of different conductivity. This is achieved by maintaining an extra temporal convolution that only depends on permittivity and conductivity of these volumes. Its discretization and computation come at almost no additional cost and do not change the computational complexity of the resulting MOT solver. Accuracy and applicability of the MOT-PMCHWT solver are demonstrated by numerical examples.
关键词： transient analysis,lossy media,PMCHWT formulation,time-domain analysis,dissipative media,Conductive media,marching-on-in-time method,integral equations
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Probabilistic Shaping and its Applications for Optical Communications
摘要： Transient interactions on conductive dielectric scatterers are analyzed by solving the Poggio–Miller–Chan–Harrington–Wu–Tsai (PMCHWT) surface integral equation with a marching on-in-time (MOT) scheme. The proposed scheme, unlike the previously developed ones, permits the analysis on scatterers with multiple volumes of different conductivity. This is achieved by maintaining an extra temporal convolution that only depends on permittivity and conductivity of these volumes. Its discretization and computation come at almost no additional cost and do not change the computational complexity of the resulting MOT solver. Accuracy and applicability of the MOT-PMCHWT solver are demonstrated by numerical examples.
关键词： transient analysis,lossy media,PMCHWT formulation,time-domain analysis,dissipative media,Conductive media,marching-on-in-time method,integral equations
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - The Possibility of Using the Concept of Colorimetric Functions in Applied Research
摘要： Mutual coupling between two dipole antennas with different dimensions placed at arbitrary parallel positions is analyzed using simultaneous integral equations with exact kernels and finite gap feeds. The Nystr?m method is applied to solve these equations. Self- and mutual-impedances are calculated and compared with the results of the induced electromotive force (EMF) method and Tai’s method. The feed structure is accurately modeled, and S-parameters are calculated based on the model. The S-parameters are measured, and the results are compared with the calculated values. They show good agreement, and the validity of this method is verified.
关键词： integral equations,Dipole antennas,feeds,mutual coupling
更新于2025-09-19 17:13:59