“Selfmodulation” of electromagnetic waves in nonlinear transmission lines

Results are presented of an experimental investigation of the effects associated with the instability of traveling and standing electromagnetic waves in lines containing semiconductor diodes.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 15, No. 2, pp. 242–248, February, 1972.     

The structure of a shock electromagnetic wave synchronous with several waves propagating in coupled transmission lines with different types of dispersion

A shock electromagnetic wave is studied numerically in the case when its structure is equally defined by two or more synchronous waves. The analysis relies on the previously suggested electrodynamic system of two coupled transmission lines one of which is normally dispersive (coaxial line) and the other is anomalously dispersive (ladder-type bar slow-wave structure).     

Solitary electromagnetic waves in nonlinear lines

The results are given of an investigation of solitary electromagnetic waves in a nonlinear transmission line with semiconductor diodes. An experimental study is made of the processes of formation, propagation, and interaction of solitary waves.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 15, No. 4, pp. 580–591, April, 1972.The authors thank V. A. Aksenov and Yu. G. Khabibullina for their help in performing the experiments.     

Propagation of electromagnetic waves in plasma filled elliptic waveguides

Propagation of electromagnetic waves in an elliptic waveguide filled with plasma is investigated in elliptic co-ordinates. Dispersion relations for the natural modes of oscillation are obtained. Expressions for power transmitted along the waveguide are obtained as integrals of Mathieu functions. Dispersion relations for circular waveguides are also obtained as limiting cases.One of the authors (S. K. Ghosh) wishes to express his thanks to the University of North Bengal for financial support.     

Influence of loss in substrate on dispersion of electromagnetic waves in active semiconductor transmission lines

By means of an electrodynamical analysis we reveal the influence of the finite conductivity of the n⁺ substrate on the dispersion of electromagnetic waves in an active strip transmission line (ASTL) based on the distributed thin film semiconductor structure metal-n-n⁺. We demonstrate a reduction of the linear amplification and the reduction of the band of amplified frequencies of the ASTL as a result of losses in the n⁺ layer in the centimeter and millimeter ranges.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 58–61, April, 1986.     

RF oscillation generated by an electromagnetic shock wave in coupled transmission lines with anomalous and normal dispersion

The generation of rf oscillation when an electromagnetic shock runs in synchronism with a backward wave in coupled transmission lines with normal and anomalous dispersions and ferrite-related nonlinearity is considered. The oscillation damping can be significantly reduced if a large portion of the rf energy flux is directed to the anomalous-dispersion line, where rf losses are relatively low.     

Interacting electromagnetic shock waves in general relativity

It is shown that the continuity conditions of Lichnerowicz must generally be relaxed in favour of the O'Brien-Synge conditions in the case of shock electromagnetic waves. This is in particular true when two electromagnetic shock waves are in collision. Gravitational impulse waves are produced as a result of the weakened conditions. An exact solution exhibiting this behaviour is derived, and the effect of the impulse waves on a measuring device are compared with experimental results of Weber.     

Characteristic electromagnetic waves in a circular waveguide filled with a biisotropic medium

A numerical solution is given for the problem of characteristic electromagnetic waves in a circular waveguide with a biisotropic rod. The dependences of the propagation constants of the different wave modes on the chirality parameter, nonreciprocity, and permittivity of the rod are obtained. The results presented can be useful when developing devices and measuring the parameters of biisotropic materials. State University, Tomsk. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 48–52, February, 1997.     

Enhanced transmission of electromagnetic waves through metamaterials

This paper reviews our recent experimental and simulation results regarding the electromagnetic wave transmission through three configurations of sandwiching structures of metamaterials: a metallic mesh sandwiched between two identical layers composed of split rings, metallic fractals, and fractal slits, respectively. We observed the enhanced transmission of the waves through these three types of sandwiching composites with respect to the opaque metallic mesh. The locations of the transmission peaks in the spectrum are associated closely with the band characteristics of the sandwiching layer by appearing either on the left- or the right-hand side of its band. PACS 41.20.Jb; 42.70.Qs; 78.20.-e; 42.25.Bs; 47.53.+n     

Cutoff of circularly polarized electromagnetic waves in a waveguide filled with axially magnetized plasma

The paper deals with an experimental investigation of the cutoff conditions for RHCP and LHCP waves propagating in an axially magnetized plasma filling a circular waveguide. The results of an experiment carried out in the X-band are in a qualitative agreement with the linear theory.     

电磁波在旋波介质中的传播特性研究

介绍了旋波介质的结构特征，讨论了旋波材料的电磁性质和物质方程，结合麦克斯韦方程和边界条件。给出了电磁波入射介质的反射系数和透射系数。，     

Reflection and transmission of plane electromagnetic waves in uniaxial bianisotropic materials

Electromagnetic waves in the most general linear reciprocal uniaxial media are considered. The theory is appropriate for novel reciprocal microwave materials which have properties of chiral composites and omega structures (or both) and can be modeled by uniaxial bianisotropic constitutive relations. Field coupling terms in the media equations are assumed to be the most general uniaxial dyadics with symmetric and antisymmetric components. Plane eigenwaves in unbounded media are studied and the theory of reflection and transmission in plane layers is constructed.     

Modelling of shallow sea waves in non-linear transmission lines

Summary We have modelled gravity waves in shallow water by means of non-linear transmission lines working in the radiofrequency range. The analogy between a one-dimensional shallow-water medium and a transmission line is demonstrated by the similarities of both their non-linear and dispersive properties. We discuss the results of our experiments on specially constructed radiofrequency models, and compare them with the observations of other authors on shallow-water sea swell. The formation of the shallow-water swell spectrum may be explained, in a whole variety of cases, by the non-linear mixing of the spectral components of waves approaching the shore. This is accompanied by both up- and down-conversion of the wave energy.     

Propagation of nonlinear waves in bi-inductance nonlinear transmission lines

We consider a one-dimensional modified complex Ginzburg-Landau equation, which governsthe dynamics of matter waves propagating in a discrete bi-inductance nonlineartransmission line containing a finite number of cells. Employing an extended Jacobielliptic functions expansion method, we present new exact analytical solutions whichdescribe the propagation of periodic and solitary waves in the considered network.