The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A planar implementation of groove gap waveguide is presented at Ka-band. The new structure has similar modal characteristics to air-filled machined groove gap waveguide, but in a low-cost fabrication technology that may be readily integrated with surface mount components. The structure provides two DC isolated conducting planes while still providing a low-loss planar transmission medium. A coplanar...
The utilization of Electromagnetic band gap in microstrip antenna design becoming most popular. This periodic structure interacts with electromagnetic waves. It characterized by frequency stop-band, pass bands and band gap. Its application seen in filter designs, gratings, frequency selective surfaces, photonic crystal band gap, etc. The EGB structure reduces surface wave level, back lobes and improve...
We present a new approach to super-resolution optical imaging, based on structured illumination in hyperbolic media that support subwavelength optical patterns. The proposed system has planar geometry, offers unlimited field of view, and is robust with respect to optical noise and material losses.
Water occurring on earth has always been equipped with the characteristic of frequency dispersive permittivity at microwave frequency, which thus can be seen as a promising constituent material for broadband electromagnetic wave absorption. Here, we develop water as ultrathin dielectric substrate standing on the metal backplane to construct three-dimensional grid array, which can acquire broadband...
In this paper, a novel dual-band suspended stripline (SSL) filter is proposed. Based on traditional designing technique, a band-pass SSL filter is designed. Considering the unique properties of metamaterials, we apply it to the filter structure designing. Metamaterials can produce negative permittivity and thus there forms a dual-band. The simulated results exhibit low insertion loss, high selectivity...
In the case of stone relics with cultural heritage value that are exposed to the adverse effects of direct exposure to weathering, we present a metamaterial with a composite structure that can passively control the transmittance of infrared and visible light. This periodic multi-layer structure consist of metal and dielectric layers, these have the function of low transmittance at infrared wavelengths...
We have measured the transmission spectra of splitring resonator metamaterials from 0 to 10 THz for parallel and perpendicular polarizations. Calculations of the lattice and plasmon mode dispersion relations in combination with electromagnetic simulations confirm the presence of multiple higher order lattice and plasmon modes. High frequency high-Q resonances that result from plasmon-lattice mode...
This paper describes a method to improve the return loss, gain, and directivity of a planar antenna. Our approach is based on using electromagnetic band gap (EBG) structures within a dielectric substrate. We designed two type of antennas: a reference one — a standard patch antenna- and a patch antenna having an EBG substrate, both of them work at an operation frequency of 15 GHz. The reference antenna...
In this paper we examine different applications of metamaterials in industrial environments. We provide overview of activities in laser filtering and photovoltaics. We also stress the importance of manufacturing metamaterials and metasurfaces in high volume and affordably. Specifically, we focus on the technique of rolling lithography, which can produce nanopatterned surfaces over meter-long lengths.
In this paper, a new ultra-thin flexible absorber based on a novel tetra Y-inspired metamaterial unit cell is designed for human body protection from electromagnetic (EM) field Hazard and (EM) Thermal Impact. The polyimide Kapton film is used as the substrate for its mechanical and thermal advantages. The simulation results show that the proposed Flexible Metamaterial Absorber (FMA) features a high...
This paper presents a nanoelectromechanical systems (NEMS)-based tunable infrared (IR) metamaterial formed with an array of Au/Si bilayer split ring resonators (SRRs) having two asymmetric arms. The wider arm of the SRR is anchored on the device substrate, while the thinner arm is suspended above the substrate and can be thermally actuated to bend downward. The thermomechanical deflection of the nanocantilever-like...
In this paper, we present a new approach to super-resolution optical imaging, based on structured illumination in hyperbolic media. Hyperbolic materials, either natural crystals or artificial composites with the opposite signs of the dielectric permittivity components in two orthogonal direction, support propagating waves with the wavenumbers unlimited by the frequency, and therefore allow the generation...
Magnetic superlens is a homogeneous and isotropic solid planar slab with negative permeability (usually −1) and can be applied in a wireless power transfer system to enhance the power transfer efficiency. Metamaterials with negative permeability could be achieved by split-ring resonators (SRRs). To be applied in wireless power transfer systems, the metamaterials need to be low loss, low cost, compact...
Equal and unequal miniaturized power divider with Substrate Integrated waveguide and circular Complementary Split Ring Resonator has been proposed for C band applications. SIW structure reduces loss and improves the performance, whereas CSRR varies the resonant frequency and exhibits bandpass response. The power division ratio can be varied by changing the CSRR structure configuration. The power divider...
In this paper, a novel design of metamaterial passive tag antenna for radio frequency identification operating in the UHF band is proposed. The design of the proposed tag antenna included a meandering technique to match the antenna with the tag chip and a complementary split ring resonator to reduce the antenna size. An advanced Photopaper substrate having a permittivity of 3.3, loss tangent of 0...
The need in today's wireless applications is to design antennas that are compact, robust and effortless to integrate with RF circuit components. Microstrip patch antenna is one such type which satisfies these requirements. But the two main performance parameters of an antenna namely the gain and the bandwidth are near to the ground for patch antennas. Usually the gain range of a patch antenna is 1–2dB...
This paper presents a analysis of planar double-negative (DNG) metamaterial unit cell, named split ring resonator (SRR), to obtain better miniaturization at microwave frequencies for a given physical cell size. In this study, electromagnetic transmission characteristics of square split ring resonator and circular split ring resonator of same area are investigated in a comparative manner for varying...
In this study, an electrically small, monopole slot antenna based on near-field resonant parasitic (NFRP) elements composed of metamaterial inspired capacitively loaded loop (CLL) elements is designed and analyzed via a commercial full wave electromagnetic solver. The proposed antenna has an operational frequency of 2.4 GHz and it satisfies the limits of an electrical small antenna (ESA) having a...
An electronically tunable polarization rotator based on tensor metasurfaces operating at 10 GHz is reported. The metasurface design allows the polarization tilt angle of a linearly polarized wave to be arbitrarily controlled through a simple biasing mechanism. In addition to allowing global polarization control, the design also allows global phase control.
A dumbbell-shaped slotted leaky-wave antenna based on composite right/left-handed metamaterial structure is proposed to improve the backward scanning bandwidth and achieve consistent gain. The antenna consists of substrate integrated waveguide (SIW) unit cells array, which is configured by a dumbbell-shaped slot, cut on the upper layer of the SIW, and an embedded patch underneath the dumbbell-shaped...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.