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We describe an all-dielectric metasurface, based on elliptic dielectric resonators (EDRs), which is designed to work as a beam splitter at 16.98 GHz. The proposed metasurface refracts electromagnetic incident waves with orthogonal polarizations along two specific directions without reflection.
This paper presents the design of THz Vivaldi Antenna operating in the frequency band of 0.1–6 THz. An optimized design of the antenna is developed by using the CST software to realize an ultra-wideband impedance match, which ranges from 0.7 to 6 THz, as well as a high directivity level, which varies from 3.8 dBi at 2.5 THz to 7.8 dBi at 6 THz. The antenna gain Gmax is found to be −1.6 dBi at 5.5...
Numerical simulation of electromagnetic models with multi-scale features is highly challenging owing to the fact that electrically large as well as small features are simultaneously present in the model, which requires the computational domain to be discretized such that the number of degrees of freedom (DoFs) is very large; this, in turn, levies a heavy burden on the computational resources.
The Message Passing Interface implementation ensures a reduction of the computing time and a distribution of the necessary memory to each processor. The 3D full-wave model for electromagnetic scattering from forest environment, based on the volumetric integral Equation formulation of the electric field, combined with the Characteristic Basis Function Method (CBFM) and implemented in Message Passing...
Given the well documented health effects of electromagnetic radiation on humans, the SAR reduction techniques are becoming increasingly relevant to the industry. However, satisfying the bandwidth, efficiency, size and cost requirements of a low SAR solution for the new mobile terminals remains elusive to-date. This paper presents a method for designing an SAR shield, based on combined use of graphene-type...
Numerical simulation of electromagnetic models with multiscale features is highly challenging due to the fact that electrically large as well as small features are simultaneously present in the model, which in turn requires that the computational domain be discretized such that the number of degrees of freedom (DOF) is very large and hence, levies a heavy burden on computational resources.
The aim of this research work is to discuss the use of the diagonal representation (DR) for the construction of the macro-basis functions (MBFs) when applying the Characteristic Basis Function Method (CBFM) to the problem of modeling of scattering from forests. We have applied the CBFM to improve the performances of a previously studied 3D full-wave model in order to solve electrically large forest...
In this paper, a new hybrid Mode Matching- Finite Element-Spectral Decomposition (MM-FE-SD) approach applied to the analysis of finite large arrays is presented. In particular, the MM-FE is applied to the analysis of an infinite phased array of rectangular waveguides feeding arbitrary shaped thick irises. The SD approach allows us to properly combine the results obtained in the case of the infinite...
Despite the availability of modern supercomputers, direct solution of multiscale problems by means of conventional CEM methods-be it FEM, FDTD or MoM-is highly challenging. This is because modeling of structures with fine features, which might share the computational domain with other large objects, often requires dealing with a large number of degrees of freedom. Dealing with such multiscale problems...
In this paper we present the design of a Luneburg type of lens antenna, with a flat base, designed for wide angle scan. The antenna consists of a 11-layer lens, fed at its base by a 6×6 array of waveguides. The lens is broadband and has a very high aperture efficiency, only 1 dB below that of a reference aperture antenna with a uniform amplitude and phase. Its sidelobe level is good, only −21 dB at...
In a typical Logging While Drilling (LWD) application, several coils operating in the frequency range of few KHz to MHz are used as transmitters and receivers to characterize the earth formation. Electromagnetic modeling of such a low frequency system poses serious computational challenges. In the Method of Moment (MoM) formulation, contribution of vector potential to the total field becomes several...
The purpose of this work is to present a quantitative comparison between three Method-of-Moments based domain decomposition techniques that are used for the analysis of large, disjoint finite antenna arrays. The methods considered are the Characteristic Basis Function Method, the Domain Green's Function Method, and a newly proposed improved version of the DGFM, i.e., the i-DGFM. The computational...
This paper considers the efficient numerical analysis of large, finite antenna arrays comprising of disjoint subarrays by using the Domain Green's Function Method (DGFM) [1] in conjunction with the Characteristic Basis Function Method (CBFM) [2]. In the CBFM-enhanced DGFM we consider large arrays consisting of multiple disjoint subarrays and impose the infinite array type assumption, i.e. that the...
In this work, we present a numerically efficient technique, called the Characteristics Basis Function Method (CBFM), to model large non-uniform plasmonic arrays of nanorods. The use of the CBFM dramatically reduces the number of unknowns without sacrificing the computational accuracy and enables us to handle large, truncated and non-uniform arrays. The method is rigorous and includes the mutual coupling...
Full Wave 3D electromagnetic modeling at low frequencies is an issue which still remains unresolved for a number of multi-scale problems, such as logging while drilling (LWD), modeling of brain waves, and EMI/EMC in electronic packages. All of the traditional computational methods, including the method of moments (MoM), finite element method (FEM), and the finite difference time domain method (FDTD)...
The paper presents an efficient and accurate technique for the analysis of large, finite and conformal Frequency Selective Surfaces (FSSs) which are not amenable to analysis by using conventional methods. The proposed technique is based on the Characteristic Basis Functions (CBFs) to describe the currents induced on the FSS elements. The reaction integrals needed to derive the reduced matrix elements...
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