Electric and magnetic excitations in anisotropic broadside-coupled triangular-split-ring resonators

Abstract

The electric and magnetic resonances of anisotropic broadside-coupled triangular-split-ring resonators are studied for different incident wave excitations. It is shown that the higher order modes exist in both electric and magnetic resonances. It is observed that the incident electric field couples to the magnetic resonance of the designed structure under different excitations. Multiple resonance features due to the anisotropy of the structure are found in the case of different excitations and the nature of these resonances can be regulated as either an electric or a magnetic mode for different frequencies. In this way, a resonant effective permittivity or permeability can be obtained. Hence, controllable properties of the constitutive material parameters (i.e. electric or magnetic resonances, negative values, etc.) can be determined by changing the incident wave excitation.

Design and Fabrication of a Novel Wideband DNG Metamaterial with the Absorber Application in Microwave X-Band

“…The effective permittivity and permeability values are obtained from the -parameters given in Figure 6 by the use of the Nicolson-Ross-Weir (NRW) retrieval method [6,[15][16][17]. Using this method, the effective permittivity and permeability can be written as = ( / 0 )((1 − Γ)/(1 + Γ)) and = ( / 0 )((1 + Γ)/(1 − Γ)), respectively, where 0 is the propagation constant of free space.…”

“…From the first realization of the metamaterials by periodic wire and split-ring resonator (SRR) structures [3,4], there are various modified shapes and geometries such as square, triangle, Λ-, Ω-, L-, S-, and P-shaped resonators [5][6][7][8][9][10][11] utilized in the designs in order to meet certain specifications in the applications. These geometries can be set in one-, two-or three-dimensional arrangements to control the electromagnetic wave propagation behavior through the medium.…”

Investigation of microwave metamaterial based on H-shaped resonator in a waveguide configuration and its sensor and absorber applications

“…[11,18] The results show that the electric and magnetic responses of the waveguide MTM sample are not independent from each other as in the other MTM structures. [11][12][13][14][15][16][17][18]28] As seen from the figure, the negative refractive index band lies between 9.71 and 10.89 GHz for the simulation and between 9.75 and 11.5 GHz for the experiment. Note that only the real part of the permeability is negative between 10.5 and 11.0 GHz.…”

“…The accuracy of the measurements can be clarified by the good agreement between the simulation and experimental results. [7,11,18,28] 3. Effective constitutive parameters…”

“…The effective constitutive parameters are extracted from S-parameters using the standard retrieval procedure [18,[28][29][30] by taking the take advantage of the method of images as mentioned in the introduction part. The equivalent structure (obtained by method of images) is the combination of an infinite number of the repeated samples in all spatial directions.…”