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An planar extremely subwavelength Mu-negative metamaterials is presented at low frequencies, composed of periodically arranged lumped components and subwavelength distributed structures with the combination of double layer rectangular spiral unit structure. The magnetic polarizability is induced by the resonance of the dual-layer metamaterials excited by an alternating electromagnetic field. The equivalent...
In this paper, metamaterials are regarded as a kind of specific medium. The application of three-dimensional electromagnetic field finite element mesh generation methods makes a finite element analysis and calculates the integral to metamaterials and its surrounding spatial structures so as to solve the spatial distribution of meta-materials and its surrounding electromagnetic parameter B and H under...
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...
The designing of the two-dimensional extremely subwavelength epsilon-negative metamaterials is presented at radio frequencies. The operation of the proposed components originates from the resonance of a dual-layer metamaterial of inclusions excited by an alternating electric field. The real part of permittivity should be assuming negative values in the artificial materials from 11.1MHz to 14MHz. To...
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...
According to the Doppler Effect, the frequency of the incident wave changes when there is a relative motion between the source and the detector in normal substances with both permeability and permittivity positive. While in metamaterials with both permeability and permittivity negative, the inverse Doppler Effect would occur and the variation of the frequency is opposite to the normal Doppler Effect...
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...
Broadband frequency selective directing of electromagnetic waves on the interface between the anisotropic metamaterials and conventional materials based on the two dimensional transmission line grids is realized. In certain frequency region, the dispersion relation of the anisotropic metamaterials shows two different kinds of behaviors beside the resonance frequency. The interface consisted of the...
The electromagnetic properties of an MNG–DPS–MNG surface plasmon-like channel with side defect based on transmission line structure are experimentally studied. The results of simulation and experiment show that the channel with a single side defect is not transparent to electromagnetic (EM) waves because of the resonators effect. While a transmission peak appears in the channel with double side defects...
The non-reflection at the interface with broadband performance is realized when the electromagnetic wave transmits from the anisotropic metamaterial to the isotropic region based on the unloaded transmission line grids. This phenomenon is analyzed with the transmission line methods and verified by the results of the CST MICROWAVE STUDIO simulations.
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...
The metamaterial perfect lens with DPS/DNS/DPS structure is experimentally realized by using transmission line approach. We studied the properties of metamaterial perfect lens using the time-domain method with a measurement experiment system. It is shown that the focus of the metamaterial lenses can surpassing the diffraction constraint, and the focal spot in the second DPS region has a maximum beam...
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