Analysis Of Electromagnetic Field Coupling Research Articles

Matrix analysis of high-density arrayed waveguides: Crosstalk suppression by bending

For many photonic devices, crosstalk between densely packed waveguides poses a major problem leading to unreliable or inefficient operation of the device. In this work, a general method for modeling the crosstalk, not only in straight waveguide arrays but also in curved ones, is introduced. The method is based on a matrix analysis of electromagnetic field coupling between closely spaced waveguides. As an example, we show how bending of waveguides in an array reduces the crosstalk. The approach can help overcome the crosstalk problem in a variety of photonic integrated devices, including phased waveguide arrays, arrayed waveguide gratings, optical multiplexers, and high-density interconnects between optical and electronic components. Published by the American Physical Society 2024

Transient Electromagnetic Field Coupling to Buried Thin Wire Configurations: Antenna Model versus Transmission Line Approach in the Time Domain

The paper examines the antenna model for the transient analysis of electromagnetic field coupling to straight wire configurations buried in a lossy half-space. The wire antenna theory (AT) model is implemented directly in the time domain and it is based on the corresponding space-time Pocklington integrodifferential equation. The solution of the Pocklington equation is carried out analytically. The obtained results are compared against the results calculated via the transmission line (TL) approach. The TL approach is based on the telegrapher’s equations, which are solved using the modified transmission line method (MTLM) and Finite Difference Time Domain (FDTD) technique, respectively. Some illustrative computational examples for buried straight wire scatterer and horizontal grounding electrode are given throughout this work.

Electromagnetic Field Coupling to Overhead Wire Configurations: Antenna Model versus Transmission Line Approach

The paper deals with two different approaches for the analysis of electromagnetic field coupling to finite length overhead wire: the wire antenna theory (AT) and the transmission line (TL) method. The analysis is carried out in the frequency and time domain, respectively. Within the frequency domain analysis the wire antenna formulation deals with the corresponding set of Pocklington integrodifferential equation, while the transmission line model uses the telegrapher's equations. The set of Pocklington equations is solved via the Galerkin-Bubnov scheme of the Indirect Boundary Element Method (GB-IBEM), while the telegrapher’s equations are treated using the chain matrix method and the modal equation to derive per-unit-length parameters. For the case of the time domain analysis AT model uses the space-time Hallen integral equation set, while TL approach deals with the time domain version of the telegrapher’s equations. Hallen equations are handled via time domain version of GB-IBEM, while time domain telegrapher’s equations are solved by using Finite Difference Time Domain (FDTD) method. Many illustrative computational examples for the frequency and time domain response, respectively, for several configurations of overhead wires, obtained via different approaches, are given in this paper.

Comparison of analytical and boundary element modeling of electromagnetic field coupling to overhead and buried wires

The paper deals with various approaches for the analysis of electromagnetic field coupling to horizontal straight line of finite length in the presence of a lossy half-space based on the theory of thin wire antennas. The formulation is posed in the frequency domain and it is based on the corresponding Pocklington integro-differential equation. Throughout this work the Pocklington equation is solved numerically via the Galerkin–Bubnov scheme of the indirect boundary element method (GB-IBEM) and analytically. The obtained results are compared to NEC results and to the results obtained by applying the transmission line (TL) model, i.e. to the results obtained by solving the corresponding Telegrapher’s equations.

Electromagnetic Field Penetration Analysis of a Rectangular Aperture-Backed Cavity Based on Combination of Electromagnetic Topology and Mode Matching

In this article, a new method that is based on a combination of electromagnetic topology and mode matching is proposed for the analysis of electromagnetic field coupling. The proposed method can accurately solve the electromagnetic field coupling in a complex system with a short computation time and reduced memory. A wire within an aperture-backed cavity model was analyzed, and the electric field intensity in the cavity and the induced surface current on the wire were computed. The results were compared with finite difference time domain results and confirmed the electromagnetic field coupling is influenced by the geometry of the enclosure.

Global modeling and control strategy simulation

To optimize the operation of internal combustion engine (ICE), maximize fuel economy, and minimize emissions, many novel traction schemes have been developed. Among those, an electromechanical converter known as electric variable transmission (EVT) was presented in, which enables a continuously variable transmission (CVT), starter, and generator. It is especially suitable for hybrid electric vehicles (HEVs) as a series- and parallel-hybrid or a split-power hybrid transmission system. Similar designs could be found in with emphasis on either the design of machine structure and cooling or the analysis of electromagnetic field coupling. However, to successfully use EVT in HEVs, it is necessary to study the vehicle power flows and EVT control method to satisfy vehicle performance and optimize operation of subsystems. Besides, the EVT design specifications, such as rated power, rated torque and rated speed, are also closely related to the vehicle control target and control strategy.The objective of this article is to provide a control strategy for an HEV using an EVT. A global modeling for an EVT equipped HEV is needed to develop control strategy. Energetic macroscopic representation (EMR) is used to model such a complex system. It is a graphical tool (see Synoptic of EMR) suitable for modeling and control of complex electromechanical systems. Using EMR, the interconnection of subsystems is organized according to the physical causality.

Circuit-Based Analysis of Electromagnetic Field Coupling With Nonuniform Transmission Lines

This paper presents a new algorithm for simulating electromagnetic (EM) field coupling with nonuniform multiconductor transmission lines in a circuit simulation environment. The proposed algorithm is based on the concept of passive model-order reduction, whereby an algorithmically developed passive reduced-order model, coupled with a set of equivalent sources representing the incident filed, are shown to accurately capture the behavior of the transmission line under EM excitation. The reduced-order model is developed independently from the particular shape of the incident field pulse, in the sense that, in constructing the model, one does not need prior knowledge about the waveform of the incident pulse of the EM field. In addition, it is also shown that the model developed can be used to simulate the transmission line in the absence of the EM field. The derived equivalent sources, representing the field coupling, are given directly in the time domain, thereby making simulation under nonlinear circuit terminations an easy task. Although the proposed work is aimed mainly at simulating nonuniform transmission lines, it can be applied to uniform lines as a special case. The proposed algorithm has been validated numerically with several examples.

Investigation of a Dipole Model for Transient Analysis of Electromagnetic Field Coupling into Long Cables

The authors describe a mathematical model for a long conductor exposed to a high-intensity transient electric field to aid in determining interface requirements at connected equipment. Dipole characteristics of the conductors are used to simulate the impedance and in turn to calculate the induced currents. Example calculations for four models, two conductor lengths, and two conductor sizes, are presented and compared.