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This paper provides numerical results of an ultra-compact high pass wavelength filter based on stub structure in a MIM waveguide. Transmission spectra can be easily tuned by adjusting distance between two edges of the stub.
This paper reports numerical results of a tunable nanoplasmonic high pass wavelength filter based on stepped impedance low-pass filter in a MIM waveguide. Transmission spectra can be easily controlled by adjusting width of dielectric medium.
This paper reports simulation results of a plasmonic wavelength band-pass filter with triangular arrays in a MIM waveguide. Simulation results confirm resonance wavelengths can be easily adjusted by changing length of opposite side to hypotenuse.
This paper reports simulation results of a plasmonic high pass wavelength filter based on triangular arrays in a MIM waveguide. Simulation results show proposed structure operates in wide range of bandwidths with low loss.
This paper reports simulation results of a plasmonic long-wavelength cutoff filter with triangular arrays in a MIM waveguide. Simulation results show reflection spectra can be easily adjusted by tuning the lines width between triangle arrays.
The Inductance, current density, Force, Pressure, and Electrical Resistance are essential quantities in railgun. These quantities are as function of bore dimension (h × s), rails thickness (w) and location of armature within the rails x(t). In this paper, the applied current pulse on the rails has the width 2.3 ms and peak amplitude 1kA. The electromagnetic launcher included copper rails and an aluminum...
This paper investigates how the shape and dimensions of projectile affect the inductance gradient and current distribution. Inductance gradient plays an important role in the performance of an electromagnetic launcher and it determines the force that accelerate projectile. Many types of projectiles geometry have various shapes such as block shape and C-shape cube with different dimensions. In this...
A current loop in the railgun has been closed by solid projectile. In this paper, the railgun has been modeled as a loop antenna which it has been simulated with three-dimensional finite difference time domain method. Normally, one assumes that the railgun is operated in the far-field region, and radiation patterns are computed in the far-field region. The railgun included copper rails and an aluminum...
Magnetic flux density and inductance gradient are main quantities. These quantities are a function of the rails shapes, railgun caliber and dimensions of rails. In this paper, the circular railgun has been simulated with the finite element method. In the circular railgun, inductance gradient is a function of the opening angle of the rail, inner and outer radius of the rails. Inductance gradient is...
Two different geometries of rail in electromagnetic launcher are rectangular and circular. In this paper, rectangular and circular rails have been simulated and been compared together with the FEM. Dimensions of circular railgun are θ=π, d= 1.2 cm, Ri= 0.948 cm, Ro= 2.57 cm and dimensions of rectangular are s=h=w= 3 cm for the calibration equal 9cm2 and surface of rails cross section equal 18 cm2...
In this paper, the railgun is assumed to be an antenna and simulated with finite element method. The caliber of railgun is 10 mm × 10 mm, rail thickness is 10mm and rail length is 400mm. Normally, one assumes that the railgun is operated in the far-field and the near-field region, and radiation patterns are computed in the far-field region where the transmitted wave of the transmitting antenna resembles...
The inductance gradient, current density, Force, Pressure, and Electrical Resistance are essential quantities in Railgun. The Inductance Gradient in the railgun is a function of bore dimension, Rails thickness and ohmic losses. On the other hand, moving Projectile inside the rails or in other words Time-Changing has directly effects on the inductance gradient. In this paper, first the IEM technique...
Thermal energy in railgun is unwanted and generated by ohmic losses that are dependent to the current implied, rail dimensions, electrical conductivity (σ), and specific heat (Cp)-σ and Cp are functions of temperature. Using achievement formula by intelligent estimation method, the current density and ohmic losses on the cross section of the rail are computed. Ohmic losses are the source heat and...
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