We present a 3d magnetotelluric (MT) forwardmodeling program which computes the distribution of the electric field on an unstructured mesh. We employ high order edge elements and implement the Edge Finite Element met...
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We present a 3d magnetotelluric (MT) forwardmodeling program which computes the distribution of the electric field on an unstructured mesh. We employ high order edge elements and implement the Edge Finite Element method to accurately simulate magnetotelluric data in the form of impedance tensor. The program is open-source and optimized for both high-performance computing (HPC) architectures and nonHPC architectures. The paper details the theory, method and code work-flow. We evaluate the accuracy of our algorithm with various synthetic test models and compare our results with other Finite Element (FE) and Finite difference (Fd) algorithms. The experiments show that the implemented high order elements are effective in providing highly accurate solutions for multiple frequencies with few elements independently of the model's geometry. Hence, leading to reduced computing times.
This study introduces a novel sensor for glucose measurement based on a rectangular dielectric resonator (RdR) excited by a rectangular slot fed by a 50-omega microstrip line. The RdR operates at 6 GHz and incorporate...
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This study introduces a novel sensor for glucose measurement based on a rectangular dielectric resonator (RdR) excited by a rectangular slot fed by a 50-omega microstrip line. The RdR operates at 6 GHz and incorporates a cubic portion section for accommodating a finger or container containing the test sample. By utilizing the distinctive resonant frequencies associated with varying dielectric permittivity of different glucose concentrations, the proposed RdR functions as a reliable sensor. The sensor's performance is evaluated through a 3delectromagnetic model of the human thumb and the application of the Cole-Cole method for modeling the blood layer. Experimental validation is conducted using three alternatives (water, glucose, and alcohol) and a range of glucose concentrations (70 to 2000 mg/dL) in simulation. during experimental verification, an invasive glucometer is employed as a reference for blood sugar levels. Results demonstrate that the proposed RdR sensor exhibits higher sensitivity (36.86 MHz/(mg/dL)) than other sensor counterparts. The experimental outcomes confirm the resonance frequency alignment between the manufactured sensor and the simulated projections. Considering its economic viability and applicability, this sensor represents a promising alternative biosensor for monitoring blood glucose levels. This study introduces a novel sensor for glucose measurement based on a rectangular dielectric resonator (RdR) excited by a rectangular slot fed by a 50-omega microstrip line. The RdR operates at 6 GHz and incorporates a cubic portion section for accommodating a finger or container containing the test sample. By utilizing the distinctive resonant frequencies associated with varying dielectric permittivity of different glucose concentrations, the proposed RdR functions as a reliable sensor. The sensor's performance is evaluated through a 3delectromagnetic model of the human thumb and the application of the Cole-Cole method for modeling the blood layer
Electrical conduction describes the ability of porous media to conduct electrical charges and induced polarization (IP) describes their ability to reversibly store electrical charges. An effective conductivity can be ...
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Electrical conduction describes the ability of porous media to conduct electrical charges and induced polarization (IP) describes their ability to reversibly store electrical charges. An effective conductivity can be defined as a complex number with frequency-dependent components (i.e., the conductivity is also dispersive). Although IP effects have been observed in frequency- and time-domain electromagnetic (FdEM and TdEM, respectively) data for years, most FdEM and TdEM studies still treat the earth using the conductivity alone (therefore neglecting IP effects). electromagnetic fielddata inversion and interpretation require a quantitative three-dimensional modeling with dispersive conductivities, which is still a challenging problem. Using the generic partial-differential-equation solver Comsol Multiphysics's application program interface (API) with Matlab, we have successfully developed three-dimensional FdEM and TdEM modeling with IP effects. Benchmarks are performed using analytical solutions and other numerical techniques. Results with and without IP effects are also compared and analyzed to illustrate the importance of taking IP effects into account. Our modeling could be of great importance in quantitatively studying IP effects in the FdEM and TdEM methods, in developing new field configurations, and also in educational purposes.
The three-dimensional electromagneticmodeling of underwater targets is faced with complex environmental, low-frequency breakdown and large/multi-scale problems, which proposed high demands on the calculation method a...
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ISBN:
(纸本)9780996007849
The three-dimensional electromagneticmodeling of underwater targets is faced with complex environmental, low-frequency breakdown and large/multi-scale problems, which proposed high demands on the calculation method and speed. In this paper, the three-dimensional vector finite element method was combined with Neumann boundary conditions to achieve fast and accurate solution to the low-frequency and large-scale problem. The numerical examples showed the efficiency of the method to the three-dimensional underwater targets and environment.
Finite element method (FEM) basedelectromagnetic simulation is commonly used for low frequency problems such as motor and transformer design. But it is rarely used for electromagnetic interference (EMI) filters desig...
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ISBN:
(纸本)9781509015467
Finite element method (FEM) basedelectromagnetic simulation is commonly used for low frequency problems such as motor and transformer design. But it is rarely used for electromagnetic interference (EMI) filters design and analysis. FEM based EMI filters simulation has a number of clear advantages in comparison with conventional approaches. It takes into account mutual couplings and self-parasitics, frequency dependency of permeability can be easy included, values of components can be quickly optimized. In this article a design procedure of a three-phase EMI filter based on FEM simulation supplemented with analytical calculation is proposed. Frequency dependency of permeability, impact of parasitics on insertion losses and mutual coupling between components are taken into account. differential and common mode insertion losses are represented in accordance with CISPR 17. A complete process of the three-phase EMI filter design and analyses is presented. Use of an optimization tool for further insertion losses improvement is demonstrated.
Three dimensional integrated circuits (3dICs) are generating considerable interest as a way to increase speed anddensity while reducing power and form factor. Among the different forms of 3d integration, the use of T...
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ISBN:
(纸本)9781467364843
Three dimensional integrated circuits (3dICs) are generating considerable interest as a way to increase speed anddensity while reducing power and form factor. Among the different forms of 3d integration, the use of Through Silicon Vias (TSV) with micro-bumps in a passive interposer is a popular choice in applications ranging from wide IO memory to heterogeneous integration. Current compact modeling strategy aims at modeling TSVs with circuit elements whose values are typically computed from analytical expressions. This technique therefore does not capture system level coupling effects like TSV-Redistribution Layer (RdL) coupling. This paper presents a device physics aware 3d electromagnetic modeling of TSV structures with the capability of modeling full systems including coupling between conventional package-board layers and TSV embedded passive interposers, towards accurate signal and power integrity analysis anddesign.
This paper describes the radiated emission from signal traces changing reference planes in printed circuit boards. The effects of via distance, number of vias, plane distance, and stitching vias at the board edges hav...
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ISBN:
(纸本)9781479932269
This paper describes the radiated emission from signal traces changing reference planes in printed circuit boards. The effects of via distance, number of vias, plane distance, and stitching vias at the board edges have been investigated using 3delectromagnetic simulations. New quantitative EMC design guidelines for printed circuit boards to reduce radiated emission in the frequency range 100 MHz to 6 GHz are presented.
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