The phenomenon of super energy flows in the anisotropic left-handed material

Open Physics ◽  
2013 ◽  
Vol 11 (1) ◽  
Author(s):  
Bai Xu ◽  
Guan Yu ◽  
Li Xia ◽  
Zhi Wang
Keyword(s):  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Parallel Plate ◽  
Average Power ◽  
Electromagnetic Parameters ◽  
Left Handed ◽  
Energy Flows ◽  
Parallel Plate Waveguide ◽  
Time Average

AbstractThe super energy flows generated and transmitted have been investigated in a parallel-plate waveguide, which is filled with air and the anisotropic left-handed materials. Theoretical analysis and numerical simulations show that the propagation modes of the anisotropic super waveguide are consistent with those of the isotropic waveguides [1–3]. They also show that the loss of electromagnetic parameters size of waveguide will influence the amplitude of time-average power flows.

A Theoretical Analysis of a Circular Microstrip Antenna in a Parallel-Plate Waveguide

2013 ◽  
Vol E96.B (1) ◽  
pp. 173-181
Author(s):  
Narihiro NAKAMOTO ◽  
Tomohiro OKA ◽  
Shoichi KITAZAWA ◽  
Hiroshi BAN ◽  
Kiyoshi KOBAYASHI
Keyword(s):  
Theoretical Analysis ◽  
Microstrip Antenna ◽  
Parallel Plate ◽  
Parallel Plate Waveguide ◽  
Circular Microstrip Antenna

LEFT-HANDED METAMATERIALS MEASUREMENT UTILIZING PARALLEL-PLATE WAVEGUIDE SYSTEM

2011 ◽  
Vol 25 (17) ◽  
pp. 2365-2370 ◽  
Author(s):  
C. ZHU ◽  
L. LI ◽  
C. H. LIANG ◽  
Z. J. SU ◽  
X. CHEN
Keyword(s):  
Parallel Plate ◽  
Open Loop ◽  
Retrieval Algorithm ◽  
Left Handed ◽  
Imaging Result ◽  
Measurement Results ◽  
Parallel Plate Waveguide ◽  
Waveguide System ◽  
Simulation Results ◽  
Good Agreement

A novel measurement method of parallel-plate waveguide (PPW) system is introduced to detect the characteristics of left-handed metamaterials (LHMs). A sample of LHM composed of triangular open-loop resonator plus wire structures is proposed and measured by using this PPW system. The measurement results are in good agreement with the simulation results. Furthermore, the parametric retrieval algorithm, the calculated negative phase shift and the simulated subwavelength imaging result are given to validate the authenticity of PPW measurement system, which effectively demonstrates the measured transmission passband is indeed a left-handed passband.

scholarly journals Theoretical Analysis and Design of an Innovative Coil Structure for Transcranial Magnetic Stimulation

2021 ◽  
Vol 11 (4) ◽  
pp. 1960
Author(s):  
Naming Zhang ◽  
Ziang Wang ◽  
Jinhua Shi ◽  
Shuya Ning ◽  
Yukuo Zhang ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Transcranial Magnetic Stimulation ◽  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Magnetic Stimulation ◽  
Influential Factors ◽  
Intersection Angle ◽  
Electromagnetic Field Distribution ◽  
Analysis And Design ◽  
Coil Structure

Previous research showed that pulsed functional magnetic stimulation can activate brain tissue with optimum intensity and frequency. Conventional stimulation coils are always set as a figure-8 type or Helmholtz. However, the magnetic fields generated by these coils are uniform around the target, and their magnetic stimulation performance still needs improvement. In this paper, a novel type of stimulation coil is proposed to shrink the irritative zone and strengthen the stimulation intensity. Furthermore, the electromagnetic field distribution is calculated and measured. Based on numerical simulations, the proposed coil is compared to traditional coil types. Moreover, the influential factors, such as the diameter and the intersection angle, are also analyzed. It was demonstrated that the proposed coil has a better performance in comparison with the figure-8 coil. Thus, this work suggests a new way to design stimulation coils for transcranial magnetic stimulation.

Modulation instability in nonlinear chiral fiber

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Demissie Jobir Gelmecha ◽  
Ram Sewak Singh
Keyword(s):  
Theoretical Model ◽  
Numerical Simulations ◽  
Pulse Propagation ◽  
Modulation Instability ◽  
Constitutive Relations ◽  
Gain Spectrum ◽  
Circularly Polarized ◽  
Left Handed ◽  
Simulation Results ◽  
The Difference

AbstractIn this paper, the rigorous derivations of generalized coupled chiral nonlinear Schrödinger equations (CCNLSEs) and their modulation instability analysis have been explored theoretically and computationally. With the consideration of Maxwell’s equations and Post’s constitutive relations, a generalized CCNLSE has been derived, which describes the evolution of left-handed circularly polarized (LCP) and right-handed circularly polarized (RCP) components propagating through single-core nonlinear chiral fiber. The analysis of modulation instability in nonlinear chiral fiber has been investigated starting from CCNLSEs. Based on a theoretical model and numerical simulations, the difference on the modulation instability gain spectrum in LCP and RCP components through chiral fiber has been analyzed by considering loss and chirality into account. The obtained simulation results have shown that the loss distorts the sidebands of the modulation instability gain spectrum, while chirality modulates the gain for LCP and RCP components in a different manner. This suggests that adjusting chirality strength may control the loss, and nonlinearity simultaneously provides stable modulated pulse propagation.

Parallel-Plate Waveguide Terahertz Time Domain Spectroscopy for Ultrathin Conductive Films

2015 ◽  
Vol 36 (12) ◽  
pp. 1182-1194 ◽  
Author(s):  
M. Razanoelina ◽  
R. Kinjo ◽  
K. Takayama ◽  
I. Kawayama ◽  
H. Murakami ◽  
...  
Keyword(s):  
Time Domain ◽  
Parallel Plate ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Conductive Films ◽  
Parallel Plate Waveguide

Diffraction by a flanged parallel-plate waveguide and a slit in a thick screen

Radio Science ◽  
1979 ◽  
Vol 14 (1) ◽  
pp. 11-18 ◽  
Author(s):  
H. Henke ◽  
H. Früchting ◽  
R. Winz
Keyword(s):  
Parallel Plate ◽  
Parallel Plate Waveguide
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