Ultra-wideband (UWB) antennas with wide rectangular notched-band are proposed in this paper. The design is realized by placing dual mushroom-type electromagnetic-bandgap (EBG) structures on the CPW feeding line. patches of EBGs laid back size substrate and dead against Shorting pins utilized to connect patch Then, line operates as ground plane for EBGs. By tuning two resonant frequencies EBG making them merge each other, a notchedband achieved. Research also found that methodology has...

Automatic recognition of cardiac arrhythmias is important for diagnosis abnormalities. This paper presents a new approach to classification ECG signals based on feature extraction diagnose heartbeat irregularities. We introduce the independent component analysis (ICA) method and propose an over-complete combining ICA basis function's coefficients wavelet transform coefficients. A set relevant features are selected from entire overcomplete using selection method. The used trained support...

An ultrawideband and high-gain circularly polarized (CP) antenna fed by inclined double-Y-shape slot is proposed in this letter. The structure mainly composed of two patches, an aperture coupling-fed layer a metallic reflector. metal reflector placed under the feeding for generating unidirectional radiation improving gain antenna. Right-hand circular polarization achieved adjusting lengths branches Y-shape slot. In order to expand impedance bandwidth (IBW), patches are used. By chamfering...

Polarization converter is firstly proposed with the functions of simultaneously converting a linear polarization (LP) and circular (CP) to its corresponding cross polarizations, conversion ratio (PCR) graphene strips also controllable in this paper. A reflectiontype designed based on metasurface terahertz region. It consists periodic unit cells strip-loaded half elliptical rings, dielectric spacer layer, gold layer. The PCR regulating includes Both LP CP incidences can be converted into...

A dynamically tunable plasmon induced transparency planar structure with double layers hollow-cross graphene array is proposed in this paper. Due to energy oscillating back and forth between two weak hybridized states made up of upper lower graphene, a transparent window during resonance points generated, the PIT curve fits well Lorentz model. Via tuning Fermi maximum transmissivity 98.3% modulation depth 17.3% can be manipulated. In addition, amplitude frequency transmittance controlled by...

Decoupling of a wideband circularly polarized (CP) conformal array is studied by single-negative (SNG) metamaterial (MTM) isolator. The consists two CP antennas, which are assembled on an arched carrier, and SNG structure placed between the antenna elements for coupling reduction. four wheel-shaped units concentrically. bianisotropic, its constitutive parameters tailored to form wide isolation band. By using proposed structure, mutual reduced up 25 dB at 4.5 GHz, improved in 3.9-5.05 GHz In...

Terahertz electromagnetic (EM) wave absorbers are vital in photonics, however, they suffer from limited bandwidth. A new approach for ultra-wideband (UWB) terahertz absorber design is proposed with metal and graphene metasurfaces. The UWB characteristics owing to three factors: (1) the metasurface boosts surface plasmon-polaritons (SPPs) of which leads confined field enhancement, (2) merging interaction resonances metasurfaces, (3) multiple reflections superpositions between metasurfaces...

An ultra broadband all-dielectric transmitarray antenna (TA) is designed based on genetic algorithm optimization (GAO) and 3-D print fabrication technology. The array element composed of pillars with different sizes distributed the two sides a substrate. operating in out-of-band resonance (OBR) zone, whose transmission amplitude nearly one phase can be easily controlled. Afterward, geometric parameters elements positions TA surface were optimized using generalized Snell's Law-based GAO,...

We sought to investigate the expression of MALAT1, plasma brain natriuretic peptide, and Tei index in sepsis-induced myocardial injury. The current retrospective analysis focused on 146 sepsis patients admitted our hospital from February 2021 March 2023. Based presence or absence injury, were divided into two groups: group (n = 80) injury 66). 28-day mortality status patients, they also a survival 143 cases death 3 cases. study compared levels between group, as well comparison sets...

A methodology to design a multi-functional device (MFD) with switchable absorption and polarization conversion (PC) modes is proposed in this research. The combines graphene absorbing metasurface (GAM) (PCM) one component. key point that the (AM) should be made completely by conductivity tunable material, such as graphene. PCM can constructed fine metal. prototype designed verify designing stacking layer of gold pattern two layers GAM fishnet shape patterns. In PC mode, chemical potentials...

Abstract A broadband four-feed circular patch antenna is demonstrated to generate high-purity dual-mode vortex beams carrying orbital angular momentum (OAM) for the first time. The electric field formula of circularly polarized (CP) component derived analyzing radiation characteristics different OAM modes, such as CP property, phase and amplitude distributions. Theoretical calculation numerical simulation results show that operating in TM n 1 mode can ± waves. prototype a 21 -mode fabricated...

Terahertz electromagnetic (EM) wave components usually have a single function, such as they can only convert the polarization state of an incident or absorb energy, which would be limitation for their applications. To make breakthrough, multi-functional device (MFD) is proposed in this paper, and it capable switching between absorption mode conversion mode. The has low-profile simple structure, constructed by graphene-based absorbing metasurface (AM) gold-based (PCM). By controlling chemical...

A wideband vortex beam reflectarray is designed and fabricated to generate the orbital angular momentum (OAM) waves for an <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\boldsymbol{l} = 2$</tex-math></inline-formula> mode. quarter-wavelength element proposed achieve a reflection phase of 360° at frequency 6 GHz. The consists loop patch, cross-dipole four square patches. symmetric structure makes it...

Functional brain imaging has tremendous applications. The existing methods for functional include Magnetic Resonant Imaging (fMRI), scalp electroencephalography (EEG), implanted EEG, magnetoencephalography (MEG) and Positron Emission Tomography (PET), which have been widely successfully applied to various studies. To develop a new method imaging, here we show that the dielectric at site dynamic nature, varying with local neuronal activation as permittivity of varies ion concentration...

ABSTRACT New zeroth‐order resonators (ZORs) were utilized as parasitic elements to enhance bandwidth of microstrip antenna. By utilizing one, two and three resonators, extra corresponding numbers resonances generated. Then, by merging the with that antenna, measured impedance can be increased from 56 MHz reference antenna 101, 120, 133 ZORs loaded antennas. As ZOR is very small (approximately λ 0 /10), area ratio proposed enhanced antennas referenced (RMA) only approximately 1.33. © 2017...

A novel broadband polarization rotation (PR) reflective Metasurface (PRRM) with a high conversion ratio (PCR) is proposed in this paper. The PRRM consists of periodic array rhombus hollow structures (RHSs), which can rotate an incident linearly polarized wave by 90°. As the RHS stimulates four resonances, very wide operating frequency band obtained. surface current distributions on structure are discussed to reveal physical mechanism. In 14.2-36 GHz (a relative bandwidth 86.9%), converted...

In this paper, high-order orbital angular momentum (OAM) vortex beams (OAMVBs) are generated using reflective metasurface. Generating OAMVBs traditional metasurface methods deteriorates the radiation performance that affects mode purity of OAMVBs. A is proposed to generate with <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$l=4$ </tex-math></inline-formula> at designed frequency 6 GHz. It revealed has...

A lens antenna (LA) with the characteristics of ultrawide band and high aperture efficiency is proposed in this letter. Moreover, automatically designed by genetic algorithm (GA) finite-different time-domain method, which provides a convenient solution for designing. Compared to feeding ridged horn, measured gains LA are enhanced 4.4–7.4 dB 6–18 GHz band, efficiencies also increased 10%–33% band. The maximum 92.4% at 6 GHz. 1 steady gain 13–18 (up 32.3%). all-dielectric structure can be...

An uni-directional antenna designed by resonance-based reflector has the merits of compact size, low-profile, and ultra-wide impedance bandwidth. However, its front to back ratio (FBR) bandwidth is narrow owing small reflection coefficient values at high frequencies RBR in-phase band. To solve this problem, a ring-shaped director (RD) was placed above reflector-based guide frequencies. Then, FBR enhanced. The proposed achieves wide measured from 2.17 3.76 GHz (53.6%). Its band (FBR >7 dB)...