scholarly journals Effect of Material Thickness on Attenuation (dB) of PTFE Using Finite Element Method at X-Band Frequency

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Abubakar Yakubu ◽  
Zulkifly Abbas ◽  
Mansor Hashim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Rectangular Waveguide ◽  
Electric Field Intensity ◽  
Reflection Coefficients ◽  
Band Frequency ◽  
Ptfe Sample ◽  
X Band ◽  
Element Method

PTFE samples were prepared with different thicknesses. Their electric field intensity and distribution of the PTFE samples placed inside a rectangular waveguide were simulated using finite element method. The calculation of transmission/reflection coefficients for all samples thickness was achieved via FEM. Amongst other observable features, result from calculation using FEM showed that the attenuation for the 15 mm PTFE sample is −3.32 dB; the 30 mm thick PTFE sample has an attenuation of 0.64 dB, while the 50 mm thick PTFE sample has an attenuation of 1.97 dB. It then suffices to say that, as the thickness of the PTFE sample increases, the attenuation of the samples at the corresponding thicknesses increases.

Modeling the Variation of Electric Field Pattern on Porcelain Insulators by the Deposition of Dust Particles Using Finite Element Method

2020 ◽  
Vol 12 (6) ◽  
pp. 840-843
Author(s):  
Asaad Shemshadi ◽  
Pourya Khorampour
Keyword(s):  
Finite Element Method ◽  
Adverse Effect ◽  
Finite Element ◽  
Electric Field ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Field Pattern ◽  
Dust Layer ◽  
Porcelain Insulators ◽  
Element Method

The purpose of this paper is to investigate the changes in the electric field intensity due to the presence of dust on the 63 kV porcelain insulators using finite element method (FEM). The investigating Insulators were drawn in three different models (without dust layer as a basic structure, with uniform dust layer and heterogeneous dust layer) using AutoCAD software and in continue are analyzed with utilization of COMSOL software. Finally the derived values are analyzed and discussed in details. It is shown that the dust layer has an adverse effect on the electric field pattern, and the higher the concentration and volume of dust placed on the surface of insulators, results to an adverse effect on the electric field intensity around the porcelain insulator.

A Tunable THz Plasmonic Waveguide Based on Graphene Coated Bow-tie Nanowire with High Mode Confinement

2020 ◽  
Vol 12 ◽  
Author(s):  
Jue Wang ◽  
Tao Ma ◽  
Xu Wang ◽  
Fang Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
High Density ◽  
Plasmonic Waveguide ◽  
Field Distributions ◽  
Simulation Results ◽  
Photonic Circuit ◽  
Bow Tie ◽  
Element Method

Background: : A THz Plasmonic Waveguide Based on Graphene Coated Bow-tie Nanowire (TPW-GCBN) is proposed. The waveguide characteristics are investigated by using Finite Element Method (FEM). The influence of the geometric parameters on propagation constants, electric field distributions, effective mode areas, and propagation lengths are obtained numerically. The performance tunability of TPW-GCBN is also studied by adjusting the Fermi energy (FE). The simulation results show that the TPW-GCBN has better mode confinement ability. The TPW-GCBN has potential applications in high density integration of photonic circuit for the future tunable micro nano optoelectronic devices. Surface plasmon polaritons (SPPs) based waveguides have been widely used to enhance the local electric fields. It also has the capability of manipulating electromagnetic fields on the deep-subwavelength. Objective:: The waveguide characteristics of a THz Plasmonic Waveguide Based on Graphene Coated Bow-tie Nanowire (TPW-GCBN) should be investigated. The tunability of TPW-GCBN should be studied by adjusting the chemical potential (FE) which can be changed by the voltage. Method: : The mode analysis and parameter sweep in Finite Element Method (FEM) were used to simulate the TPW-GCBN for analyzing effective refractive index (neff), electric field distributions, normalized mode areas (Am), propagation length (Lp) and figure of merit (FoM). Results: : At 5 THz, Aeff of λ2/14812, Lp of ~2 μm and FoM of 25 can be achieved. The simulation results show that the TPW-GBN has good mode confinement ability and flexible tunability. Conclusion:: The TPW-GBN provides a new freedom to manipulate the graphene surface plasmons, and leads to new applications in high density integration of photonic circuit for tunable integrated optical devices.

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