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In this work, a metamaterial resonator based on complementary split ring resonator (CSRR) loaded with square open-loop resonator (OLR) is presented theoretically and experimentally. It is shown through equivalent circuit model that the addition of OLR to the conventional CSRR-loaded cell generates transmission zero in the upper stop band and improves the upper band rejection level without increasing...
In this talk, an equivalent circuit method has been proposed to understanding the physical mechanism of a windmill structure metamaterial (WSM). As we known, studying the physical mechanism mean to need to derived the expressions of permeability and permittivity. Noticed from some literature [1–3], they can't offer the researchers the principles of selecting the structural parameters for the desired...
The resonant frequency of terahertz metamaterials is closely related to parameters which the metamaterials is composed of, but analysis of the resonance frequency is used to rely on simulation software. In this paper, an analytic model for the resonant frequency of the split ring resonators is presented based on LC resonant circuit model and taking into accounted kinetic inductance and surface capacitance...
In this paper, A novel wide-band uniplanar electromagnetic band gap (EBG) structure composed of complimentary split ring resonator (CSRR) and X shape bridge, called the X-CSRR EBG structure, is proposed to suppress ground bounce noise (GBN) and simultaneous switching noise (SSN) in power ground plane. Compared with conventional uniplanar EBG structures, such as the AI-EBG structure and the S-EBG structure,...
A fully-printed biplanar design of a volumetric negative-refractive-index transmission-line (NRI-TL) metamaterial is presented. The proposed structure employs dual-arm spiral inductors providing stronger loading inductance and leading to better matching to free space, while still possessing a small electrical length of one-eighteenth of the operating free-space wavelength.
A simple and effective method to attenuate the propagation of switching noise within a power delivery network (PDN) on PCB-level is to use an electromagnetic band-gap structure (EBG). To determine the limit frequencies of the band-gap, an accurate model of the structure is necessary. This paper exploits the fact, that the patches of the EBG are electrically small at the frequency range below the band-gap...
We have previously proposed to use reflectarrays to eliminate blind zones in a propagation area of very high-speed wireless communication systems and have shown that one candidate of such reflectarrays is metamaterial reflectarray which has mushroom structure. The reflection phase of mushroom structure can be calculated applying a parallel resonant circuit model with inductance L and capacitance C...
This paper investigates about the main properties of metamaterials and proposes an application of these structures as high band pass filter in the frequency range 0 - 10 Ghz. The equivalent circuit is extracted: some electrical parameters are carried out by the finite element method, other by the analytical solution and other by the finite difference method. The ohmic losses are neglected and the...
A novel via-free microstrip Left Handed (LH) Transmission Line (TL) utilizing Radial Stubs (RS) is proposed. The microstrip RS is approximated by a series combination of inductance and capacitance. The electrical equivalent circuit of LH TL unit cell including the equivalent inductance and capacitance of radial stub is discussed. The balanced and unbalanced LH TL is implemented in microstrip technology...
In this paper, an exhaustive analysis of resonant type metamaterial transmission lines is carried out. Specifically, the effects of the dimensions and resonator characteristics on the frequency response are studied and interpreted to the light of the equivalent circuit model of the lines. This study is important for the application of these artificial lines to microwave circuit design, since important...
A novel composite right/left-handed transmission line (CRLH-TL) meta-material is proposed with two left-handed (backward) and two right-handed (forward) pass bands. The topology and method of operation of the line are discussed. The parameters of equivalent circuits of the CRLH-TL are extracted at 2.5 GHz and 5 GHz respectively. The dispersion relations are analytically derived using the equivalent...
The dual band EESA using negative permittivity MTM structures is introduced and fabricated. The proposed negative permittivity MTM structures are operated by inductance L3 and L4. The proposed EESA, which is compared with calculations of Chu limits, has very low Q, wide impedance bandwidth and high efficiency is obtained. Therefore, proposed EESA will be applied to new generation wireless communication...
The equivalent circuit for the RLH-TL is employed to consider radiation effects due to the inclusion of a series capacitor and shunt inductor in a unit cell for the right/left-handed transmission line (RLH-TL). The S-parameters for unit cells with N=1, 3, 5, and 10 are analyzed in various aspects based the EM and circuit simulations in a trial to quantitatively estimate the radiation rate for the...
In this paper, a wideband EBG structure with an enhanced bandgap and homogeneity by loading lumped-elements is presented. Lumped-element capacitors are loaded between the adjacent patch conductors, and also lumped-element inductors are loaded in series with vertical vias in the proposed EBG, leading to a drastic reduction of the unit cell size, and consequently, an enhanced homogeneity. In addition,...
In this paper, the properties of a Single Negative (SNG) planar metamaterial are analysed, designed and measured. The Single Negative structure is made of Spiral Resonators printed on a thin dielectric layer. The analysis is based on an analytical modelling using equivalent circuits. This approach enables to explain the origin of multiple resonant frequencies in Single Negative Metamaterials. The...
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