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In this paper, we propose a fast design procedure for the low scattering metasurface in the microwave region. Since there are numerous units with various geometric dimensions inside the metasurface aiming to generate a diffusion-like scattering pattern, it presents a large computation burden for the evaluation and optimization of the scattering behaviors of the whole metasurface. To overcome this...
Characteristic mode (CM) theory is widely used nowadays for analysis and design of radiation and scattering problems. In this paper, we discuss the recent developments of advanced characteristic mode theory and its applications in complex electromagnetic (EM) problems. Following the deep physical insights into the radiation and scattering mechanisms of complex electromagnetic open problems, the effective...
An efficient hybrid method of SJMCFIE combined single integral equation with the electric/magnetic current combined field integral equation is used for analysing scattering from composite conductor and multiple dielectric objects, in which, SIE can reduce one half unknowns in dielectric regions. SJMCFIE can greatly reduce the storage requirement. Moreover, Multilevel Fast Multipole Algorithm is employed...
The transmission characteristics of a two-dimensional coaxial Bragg structure have been investigated in this paper. The dielectric layer between the outer and the inner conductors of the coaxial waveguide in the structure is helically corrugated and the grooves are loaded with a metallic strip. It is found that, a dominant transmission bandgap can be obtained from the mode conversion induced by the...
This paper introduces the first embedded Smart Connector (SmartCo) able to detect and locate incipient defect caused by various origins such as chafing, bending radius, pinching, cable movement, etc., and this even in complex wiring networks. Based on Orthogonal Multi-tone Time Domain Reflec-tometry (OMTDR) technology, the SmartCo uses the test signal not only to generate the reflectometry signal,...
Two-stage SC + Finite Difference (FD) procedures have been proposed since a long time to solve electrostatic and magnetostatic field plane problems in case of inhomogeneous dielectric materials. This had allowed to overcome accuracy problems caused by convex corners in the domain boundary and relevant field singularities, and to apply FD solvers in rectangular domains. In this paper, compound procedures...
In this paper, an equivalent circuit approach is proposed to model the electric and thermal responses in DC cable systems intended for electric ships. The proposed model is sufficient to address the complexity of the nonlinear physics, including space charge accumulation within the dielectric, yet flexible enough to enable rigorous population-based design. Indeed, a genetic algorithm has been implemented...
The emergence of fan-out packaging for 5G and IoT applications has brought escalating performance concerns that arise from the proximity of radiating components such as antennas to lossy materials such as metals and silicon. These concerns also arise in wearable (“smart skin”) electronics where the human tissues act as the lossy substrate. Artificial magnetic conductors (AMC) are widely explored for...
The operation of dielectrics in DC power apparatus depends on nonlinear and temperature-dependent conductivity of the dielectric. These two parameters are (anti-)correlated. We propose a relatively simple formalism for modeling the conductivity of polymeric dielectrics which includes this correlation based on relatively few physical parameters and which fits well the available, but admittedly limited,...
Due to a rapid development and sophistication of wireless devices that are used in the sphere of super high frequencies there appeared a new tendency, i.e. miniaturization of such devices. However, despite the decrease of sizes, such devices are to preserve operating specifications similar to those of standard structure devices. This article describes the problem of an accurate manufacturing of a...
Our previous work in studying the prospect of detecting termites using millimeter waves and in observing thermal and behavioral effects upon termites caused by irradiation by millimeter waves has caused us to investigate the study of acupuncture needle-like guiding structures which can concentrate and efficiently deliver millimeter wave energy into various dielectrics such as biological tissue or...
In recent years, continuing enhancement of highly-functional electronic devices, such as mobile terminal devices, has significantly increased the volume and speed of data transmission. This made high-frequency communication for data transmission between electronic devices essential. Thus, device component suppliers must offer products with low transmission loss in high-frequency range. An insulating...
The objective of this paper is to demonstrate the efficient calculation of design parameters using the boundary element method coupled with a highly interactive package for entering the transmission line configuration. The geometry of the problem that can be solved is arbitrary. Conductors lay be infinitesimally thin or may be of finite area. As well, the conductors may be embedded in one or acre...
A study of stacked microstrip antennas with an offset radiating element structure is presented. These structures ore investigated both theoretically and experimentally. The theory takes into account higher modes caused by the offset.
The characteristic mode (CM) theory has been widely recognized as a powerful tool for radiation/scattering analysis and optimization designs. As a natural extension of PEC CM theory and dielectric material CM theory, we propose a novel CM formulation for the systematic analysis of dielectric coated conducting bodies. The newly developed CM formulation bases on the EFIE-PMCHWT equation. Numerical cases...
A volume pixel subspace-based optimization method (SOM) is proposed to solve the electromagnetic imaging of the wave impenetrable objects/perfect electric conductor (PEC). In this proposed method, the PEC objects are approximated by highly lossy dielectric scatterers with pure imaginary permittivity and thus volume pixel SOM is successfully employed. There is no prior information such as the number...
As we all know, the merits of characteristic mode (CM) theory in antenna designs and optimizations have been well recognized in our EM community. In this paper, the scattering analysis for dielectric coated conducting bodies will be reconsidered using the modal expansion method from a novel CM formulation we developed very recently. Thus the contribution of each mode to the total scattering response...
A problem of recent interest in electromagnetics is that of scattering from a conducting body with a dielectric-filled cavity. Other authors, [1]-[3], have investigated three-dimensional (3-D) bodies. Here we investigate scattering from two-dimensional (2-D) bodies (cylinders). Because it is a simpler case, results from the 2-D case are more easily interpreted.
Electromagnetic scattering from axisymmetric conducting bodies partially coated by thin materials is computed numerically. The formulation of the problem is based on an existing formula for a completely coated object. This formulation is valid as the coating thickness approaches zero. Other existing implementations fail to obtain correct results in this case. Numerous examples are considered. The...
It has often been claimed that the microstrip antenna can be easily integrated with the feed network and circuitry on the same substrate. However, if this is actually done some compromise must be made between a good antenna performance and an acceptable circuit behavior [1]. The root of this problem lies in the fact that antenna radiation and circuitry are distinct electrical functions. Antennas require...
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