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Transmission coefficient of electrons in an asymmetrical double-barrier hetero-structure has been calculated for different barrier widths, well widths, barrier-material compositions and applied voltages. These calculations are done using transmission line analogy of resonance tunneling phenomena and the results are used to show the effects of these variable parameters on transmission coefficient in...
This work is performed to investigate the effects of normal incident electromagnetic wave with arbitrary polarization angle on the electric shielding effectiveness of a rectangular metallic enclosure with aperture by using an analytical method and numerical simulation A formulation depending on the polarization angle is successfully determined using transmission line method (TLM). A single mode normal...
Electrorheological fluids (ERF) can, under the influence of an electric field, be reversibly transformed from a fluid-like to a solid-like state, the acoustic characteristic of ERF is electrical controllable. As a theoretical model, the Biot theory has been applied. Then we analyzes the impedance-matching properties of ERF whose specific acoustic impedance varies smoothly across the ER, from the effective...
This work presents a fast solver that always annihilates the divergence of solenoidal functions, independent of the precision of the compressed impedance matrix elements. The solver is obtained by compressing a loop-tree transformed impedance matrix by using a properly tailored fast solver. Then the impedance matrix in the usual (and undecomposed) RWG basis is reconstructed by a linear-in-complexity...
The electric field integral equation (EFIE) has been widely used in the moment method (MoM) solution of electromagnetic problems. However, due to the spectrum property of the EFIE operator, the resulting MoM impedance matrix has eigenvalues clustered around the origin and at the infinity as the mesh density increases, leading to a dramatic increase of the matrix condition number. When the object is...
Recently, several papers have proposed using the Calderon identities to develop an analytic preconditioner for the electric field integral equation (EFIE). We extend these results by first giving simple, physical explanations for Calderon preconditioning and the special basis functions used to implement the method. Also, it is shown that the preconditioner can be easily integrated with the fast multipole...
Exact calculation of characteristic impedance for a single and a parallel coupled stripline or microstrip line is needed to analysis and synthesis of stripline circuits. There are many calculation methods for the stripline with zero thickness or finite thickness of strip conductor. Analytical solution for zero thickness has already been given by conformal mapping method, but that for finite thickness...
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