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This paper is focused on optimization of electrical properties of 50 ohm stripline which was described in international standard for the automotive industry ISO 11452-5. The standard shows the dimension of the stripline but information about impedance matching is missing — and this information is crucial for a power amplifier connection, especially in terms of VSWR parameter. In this paper connection...
Electromagnetic boundary conditions of the most general linear and local type, involving 10 parameters, are defined in this paper and some properties and interesting special cases are considered. The paper is devoted to the memory of professor Staffan Ström (1934–2016), who is remembered as an outstanding scientist in Electromagnetic Theory.
Quasistatic and electromagnetic simulation of three cross-sections of interconnects of new PCBs for circuits with redundancy is performed. It is shown that the results are consistent. The relative difference was 4% for the difference of per-unit-length delays of modes and 40% for the pulse amplitudes. Meanwhile, the simulation time of quasistatic analysis is 263–1261 times less than that of electromagnetic...
The paper shows the possibility to increase the duration of ultrashort pulse which can be decomposed in the one turn meander delay lines. For this purpose, we suggested a condition that increases duration of ultrashort pulse up to a value that is equal to twice the product of the minimum of per-unit-length delays of even and odd modes of a signal and the length of half-turns. Simulation showed the...
This paper present a possible evolution of Air defense systems which can lead to an Air Defense Age. First the evolution of aerial threat is presented. After that the aerial threat are classified according with the rule of 4 seconds. Because is not possible to increase the projectile muzzle velocity more than 1500 m/s using chemical energy a way based on electromagnetic energy is investigated. After...
We present a new method to solve the Electric field scattered by a perfect electric conductor that is stable in low frequency and multiply connected geometries. The method is closely related to a previous method published by the authors and named Decoupled Potential Integral Equation, but it only requires the incoming electric field instead of the vector and scalar incoming potentials. The method...
Multi-conductor devices are very common in microwave engineering, such as in combline or interdigital filters. The electromagnetic fields in these devices involve multiple transverse electromagnetic (TEM) modes, which can be characterized by the Finite Element Method (FEM). This paper presents an efficient formulation not only to compute but also to subsequently orthonormalize these multiple TEM modes...
In this paper, the total far-field pattern around a finite width strip in presence of an electric line source using perfect electric conductor (PEC) and impedance strip equations are presented. We used two dimensional uniform geometrical theory of diffraction (UTD) in both analysis for soft (TM) polarization. For finite PEC strip, we used PEC strip equations and for finite impedance strip we used...
Relevance of research is caused by need of an assessment of the extreme magnetic energy reserved in working gaps of the electromechanical converter of electromagnetic type at saturated magnetic system at a stage of start-off of an anchor. As the electromechanical converter the pulse linear electromagnetic engine can be used. Such assessment will allow to reveal ways of increase of specific power indicators...
In this paper, we propose a kind of leaky-wave antenna based on spoof surface plasmon polaritons (SPP) along the metallic wire with gradient radial grooves. Coaxial wire, supporting traditional guided waves, is used to feed the proposed structure. The conversion between coaxial wire and SPP waveguide is achieved by the flaring outer conductor of the coaxial wire and gradient radially corrugated inner...
In this paper, we summarize the formulation of the augmented electric field integral equation to solve perfect electric conductor and dielectric problems. By studying the numerical integrations of the lossy Green's function, we extend this formulation for dielectrics to conductors precisely. We develop a novel angular integral method to evaluate the numerical integrals. This method turns out to be...
This paper presents a transition from double-ridge waveguide to coaxial line, working at 4–5 GHz. The size of the double-ridge waveguide is WRD350. The design of the transition is based on the theory of mode conversion and step-impedance matching. The transition between the high and low impedance is achieved by employing the Chebyshev type of quarter-wavelength step-impedance matching. Using lead-inserted...
The electromagnetic wave absorption mechanism of conductorbacked electromagnetic wave absorbers with periodically arranged conductor patterns on the surface layer (pattern absorbers) was investigated. The pattern absorbers in this work were composed of a patterned layer acting as a frequency selective surface, such that the pattern served as a resonator together with a back reflector. Electromagnetic...
For the purpose of efficacious protection of HF (high frequency)/VHF (very-high frequency) transceivers against LEMP (lightning electromagnetic pulses) and NEMP (nuclear electromagnetic pulses), antenna feed protection modules should fulfill the requirements of low onset voltage, nanosecond-level response time and large current conduction capability. We proposed in this paper the design and verification...
Electromagnetic problems with both conducting and dielectric media are formulated through volume-surface integral equations (VSIEs) in integral equation approach. The conducting part is described by surface integral equation while the dielectric part is governed by volume integral equations (VIEs) and they are coupled together by produced fields. The VSIEs are usually solved by the method of moments...
Solving electromagnetic (EM) scattering with very thin conducting objects by integral equation approach have to deal with some unfavorable problems, such as a large dynamic change of current density in the neighborhood of their edges and many low-quality meshes on the side faces of objects in geometric discretization, which makes the accurate evaluation of singular integrals in matrix elements significant...
Boundary integral equations (BIE) are proposed for distributed parameter extraction of lossy conductor with arbitrary cross section in 2-D. By utilizing the equivalent principle, the electric field on the boundary is correlated with surface electric current through contour integration. Furthermore, the adaptive cross approximation (ACA) is adopted to accelerate the solution procedure. Both the per-unit-length...
When dealing with time-harmonic electromagnetic (EM) scattering problems of perfect electric conductors (PEC), the boundary integral method (BIM) is one of the standard ways to solve the Maxwell's equations as it reduces the dimension of the problem by one. The standard boundary integral method to solve EM scattering by PEC relies on finding the induced surface current densities [1]. The electric...
The paper is devoted to the comparison of two approaches for the simulation of hybrid systems which contain parts with both lumped and distributed parameters. A distributed part is represented by a multiconductor transmission line (MTL), nonuniform in general. As a framework for the solution a modified nodal analysis (MNA) is utilized to get initial equations. The first approach is based on a composition...
This paper deals with the plane wave diffraction by a lossless dielectric/perfect conductor composite structure consisting of two adjacent acute-angled wedges sharing the edge. The structure is surrounded by free-space. High frequency solutions are obtained by using the physical optics approximation for the electric and magnetic equivalent surface currents lying on the free-space/dielectric interface...
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