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In this paper, an approach based on the field equivalence principle for obtaining the information of the incident field from total field data is presented. In general, the incident field is not easy to know because it is related to not only the impressed source but also the characteristics of the transmitting antenna and the surrounding environment of the source. By using this approach, the incident...
We consider the accuracy and efficiency of surface integral equations, when they are used to formulate electromagnetic problems involving plasmonic objects at optical frequencies. Investigations on the iterative solutions of scattering problems with the multilevel fast multipole algorithm show that the conventional formulations, especially the state-of-the-art integral equations, can significantly...
The dyadic Greens' functions of the magnetic vector-potential A (DGFA) for unbounded uniaxial anisotropic media are considered in this paper. It is at first derived in the spectral domain through eigenvalue decomposition method, and later transformed back to the spatial domain to get triple integral forms, which are finally simplified to Sommerfeld integrals. In order to verify these mathematical...
In this paper, an approximate model is presented to understand Fano resonances observed in the Mie scattering from a core-shell particle with high permittivity cover. The scattering coefficients of a core-shell particle with high permittivity cover can be described by the superposition of narrow resonance and slow varying background. The slow varying background part is the same as scattering coefficient...
This paper investigates transmission characteristics of a microstrip line (MSL) with a noise suppression sheet (NSS) when thickness and permittivity of an adhesive between the NSS and the MSL are changed. The MSL based on IEC standard (IEC62333-2) is fabricated, and a transmission characteristic of the MSL attached with a dielectric-adhesive-backed NSS is simulated by a software Agilent's EMpro.
In this paper, the artificial dielectric material with anisotropic permittivity is proposed to lower the resonant frequency of square patch antenna. The anisotropic artificial dielectric material is applied to replace the dielectric material usually used for implementing the conventional square patch antenna. Here, the conventional square patch antenna which is designed based on TM10 resonance mode...
In this paper, we discovered an advanced GLLH Invisible Electromagnetic Cloak with relative EM parameter not less than one for any thickness spherical annular cloak, i.e., relative electric permittivity εr ≥ 1, εθ ≥ 1, εϕ ≥ 1 and magnetic permeability μr ≥ 1, μθ ≥ 1, μϕ ≥ 1 in the GLLH cloak sphere annular layer, for any 0 < R1 ≤ r ≤ R2. We completely and theoretically proved that our GLLH cloak...
In this paper, we report a new approach of modeling anisotropy snowpack using bicontinuous media [1, 2]. We then extract the uniaxial effective permittivity of the anisotropic bicontinuous media by numerical solving Maxwell's equation in 3D (NMM3D) over spherical samples of the media extending a few wavelengths. The effective permittivity is then extracted by comparing the coherent scattering field...
Left handed transmission line (LHT) has been built with periodic loadings of capacitance and inductance or split ring resonator and fine wire. If their periodic loadings are periodically modulated again, double periodic structures of left handed line (DLH) can be realized which is easy to fabricate for practical design. This paper analyzes Bragg interaction phenomena in DLH by using perturbation technique...
In this study, the mode-matching method was applied to formulate an analytical model for a split cylindrical cavity resonator with a thick ceramic film layer sandwiched between two-layer alumina substrates. Next, resonant frequencies with the TE011 mode were computed with an eigenvalue problem approach using the model formula. The Q value of the resonator was also calculated by applying the perturbation...
In this paper, a band stop all-dielectric metamaterial frequency selective surface (FSS) is designed based on effective medium theory and dielectric resonator theory. The FSS is made of high-permittivity ceramics without using any metallic parts. The stop band FSS is composed of 2D arrays of Jerusalem cross-shaped ceramic resonators. Solid-state sintering method is adopted to prepare the high-permittivity...
We proposed a novel micro strip sensor based on Dual-D shaped Complementary Split Resonator (Dual-D CSR) in the microwave region. In this research,the distribution of the electric field and transmission response (S21) have been simulated. Besides, we also investigated the effect of the width between Dual-D on resonance characteristics. Furthermore, the process and the performance is illustrated when...
Ever since the introduction of metamaterials, intriguing applications have been proposed by metamaterial designs. An ε = μ = −1 slab will serve as a super lens to break diffraction limit. This slab, whose permittivity and permeability is with the same magnitude but of different sign to air, is the complementary medium to air. Lai et al. proposed the possibility to remote cloaking using complementary...
In our previous work, we use accidental degeneracy to realize conical dispersions at Γ point (k = 0) in two-dimensional (2D) photonic crystals (PCs) [1]. The conical dispersion consists of a triply degenerate state with two linear bands touching at the Dirac-like point and an additional flat band intersecting it at the same frequency. If the conical dispersion is derived from monopole and dipole excitations,...
Although Kirchhoff and subspace migration algorithms have been shown to be feasible for detecting various types of inhomogeneities, this has only been confirmed for cases where the inhomogeneities are located in a homogeneous medium. In this paper, we apply Kirchhoff and subspace migrations for the detection of small dielectric inhomogeneities enclosed by small randomly distributed dielectric scatterers...
In this letter, the research on the thickness resonance of the dielectric materials using high-permittivity dielectrics is proposed based on effective medium theory. Unlike conventional bandpass FSSs, such FSS is composed of high-permittivity dielectrics plates rather than metallic or dielectric materials with structures. Strong electric and magnetic resonances are introduced to produce drastic changes...
In this paper, we proposed a type of all-dielectric metamaterial (ADM) with continues dielectric ceramics. The ceramics, possess high permitivity and low loss, are designed in fishnet shape. With this shape, continuous displacement currents are inspired inside high permitivity ceramics for the incident electromagnetic wave. Then, Lorentz type of electric and magnetic resonances are emerged simultaneously,...
In this work, we study the terahertz multichannel filtering properties based on a stage 3 triadic-Cantor-set semiconductor photonic crystal. Here, we use the semiconductor of n-InSb so that transmission responses have three regions. Two regions with frequencies well above and below the resonant frequency, the permittivity functions are nearly a positive constant. In these two regions, transmittance...
To support Localized Surface Plasmon Resonance (LSPR), a high carrier concentration in semiconductor nanocrystals is typically required. However, achieving high carrier concentration is usually accompanied by creating high concentration of ionized impurities. Scattering caused by the impurities will be very significant and limits the quality of the LSPR. In this paper, we propose a semiconductor core-shell...
In this talk, we will propose a new optimization scheme for solving electromagnetic inverse scattering problems. As known, they mean to retrieve the physical properties of hidden targets, i.e., the permittivity and/or permeability, from the measured scattering data excited by several incidences. By considering only the physical properties of the targets as unknowns, one usually resorts to the more...
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