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In this work, we study the guided wave in waveguides composed of two kinds of single-negative metamaterials. Because of the boundary condition, negative refraction of energy flow will take place at the interface of two kinds of single-negative metamaterials. The direction of group velocity is determined by the net energy flow after the compensation effect of two parts of energy flow on both sides...
This paper presents our observation of the abnormal Doppler effect inside a reconfigurable balanced transmission line, which has zero index at the balanced frequency. By applying a digital signal controller, a moving reflective interface is built inside this transmission line. The normal, inverse and zero Doppler effects are observed at different frequencies, which gives a completed picture of Doppler...
Zero-index metamaterials (ZIMs) in which permittivity (ε) and/or permeability (μ) are zero possess unprecedented abilities to manipulate the electromagnetic (EM) waves. The applications of ZIMs include EM energy control in a very narrow waveguide, wave front control, cloaking and transmission control by defects, etc.. For isotropic (anisotropic) ZIMs, both components (only one component) of the ε...
Combining the metamaterials (MMs), which possess the ability to manipulate the electromagnetic (EM) field, with the wireless power transfer (WPT) system is a new trend. In this paper, a new WPT system is proposed, which is based on the MMs electromagnetic tunneling phenomenon. This system consists of two back-to-back sandwiches structure. The sandwiches structure is classic EM tunneling model which...
Recently, we have witnessed a wave of investigations on PT-symmetric optical systems due to the promising features of tunable optical properties given by exceptional points and PT-phase transitions. Although many exotic optical properties have been demonstrated with PT-symmetry, some of these demonstrated properties are commonly believed not special to PT-symmetry. For example, unidirectional zero...
The inverse Doppler effect has been proposed for over four decades. However, there are only few experiments on it, nor to mention the practical application. The main reason is that it is difficult to build a relative movement between the source and detector in double negative materials (DNG), in which the inverse Doppler effect would happen. Here we report a practical method to realize the inverse...
We have investigated the process which establishes the tunneling mode in a conjugately matched pair consisting of -negative (ENG) and -negative (MNG) materials in theory and experiment. The one-dimensional conjugately matched pairs is realized by two L-C loaded transmission lines and the dynamical behavior of the transmitted signal along the pair is measured and recorded on an oscilloscope...
A negative refraction interface composed of a positive and negative refractive index material is realized by using two-dimensional transmission line grids. The transient interface reflection and refraction properties are studied by time-domain method where the time evolution of an electromagnetic wave as it hits the interface is simulated and measured. It is found that the wave is trapped temporarily...
Summary form only given. Metamaterials, specially, metamaterials for microwave by composite right-left-handed transmission line (CRLH-TL), are studied frequency in frequency-domain. For example, it was studied by transmission-reflection characteristics from S-parameter. But it is difficult to know clearly the relationship of phases, of group velocity, of phase velocity, and the wave propagation process...
The left-handed (LH) pass-band between about 8-10 GHz is realized in experiment by using one-dimensional composite left-/right-handed (CLRH) materials containing inter-digital capacitors and stub inductors. The LH pass-band can be adjusted by just changing the size of stub inductors, and the characteristics can be used in designing band-pass filter.
Light tunneling in multiplayer structures consisting epsiv-negative (ENG) and mu-negative (MNG) materials is investigated theoretically and experimentally. A "spatial-averaged single- negative" gap is observed due to tunneling of interface modes in periodical structures and completely transparency via tunneling is realized in heterostructures.
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