To mitigate potential interferences with coexisting wireless systems operating over 3.3-3.6 GHz, 5.15-5.35 or 5.725-5.825 GHz bands, four novel band-notched antennas suitable for ultra-wideband (UWB) applications are proposed. These include UWB a single wide notched band, narrow dual and triple bands. Each antenna comprises half-circle shaped patch an open rectangular slot ground plane. Good performance is achieved by using high permittivity low dielectric loss substrate, inserting...

This letter presents a novel transmission metasurface to achieve orbital angular momentum (OAM) waves at the X-band. The unit cell of proposed consists three dielectric layers and four metallic layers, where layer is composed an outer ring center quasi-snow patch. A good coefficient obtained operating frequency. Meanwhile, full 360° phase shift can be achieved by changing length method generating OAM studied analyzed. Based on this method, producing +1-mode wave designed simulated. To verify...

This paper presents a novel shared-aperture dual-band dual-polarized (DBDP) high-gain antenna for potential applications in synthetic aperture radars (SARs). To reduce the complexity of SAR antennae, DBDP based on concept Fabry-Perot resonant cavity is designed. operates both Cand X-bands with frequency ratio 1:1.8. form two separate cavities, selective surface layers are employed, leading to high flexibility choosing desired frequencies each band. The beam-scanning capability this proposed...

A novel polarization-reconfigurable planar antenna is presented. The consists of an electronically reconfigurable polarizer integrated with a printed slot. By changing the states p-i-n diodes on polarizer, linearly polarized (LP) waves radiated by slot can be converted into either right-hand circularly (RHCP) or left-hand CP (LHCP) waves. contains 16 unit cells arranged as <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

This letter presents a new design of Fabry-Perot resonator antenna (FPRA) with wide gain bandwidth. A double-layered dielectric superstrate, which produces reflection phase curve versus frequency positive slope, is used as partially reflective surface (PRS) to enhance the bandwidth FPRA. For physical insight, PRS analyzed by using transmission line theory and Smith Chart. Experimental results demonstrate that has 3-dB over 13.5-17.5 GHz, relatively 25.8%, peak 15 dBi. Furthermore, band...

This paper presents a compact-size, low-cost smart antenna with electronically switchable radiation patterns, and reconfigurable polarizations. can be dynamically switched to realize three different polarizations including two orthogonal linear one diagonally polarization. By closely placing several parasitic elements around the driven antenna, beam switching achieved in any of polarization states. In this design, square patch simple feeding network is used as element. The element composed...

A wideband and dual-polarization antenna array with high efficiency isolation is proposed. In order to achieve the desired performance, a radiating element full-corporate waveguide feed network are employed in design. particular, E-plane waveguides utilized for feed-network configuration so as suppress wave leakage between adjacent layers when fabricated via conventional machining techniques. The operational mechanism presented 16 × tested verification. Experimental results show that...

This communication presents the complete design of a circularly polarized (CP) folded reflectarray (FRA) antenna with an integrated planar structure for first time in open literature. To achieve polarized, printed meander-line polarizer is designed and linearly (LP) FRA. low-profile structure, 2×2 array as feed source instead horn. Thus, whole antenna, including source, LPFRA, polarizer, can be fully fabricated using low-cost circuit board technology. validate concept, right-handed CPFRA...

A broadband and high-gain, circularly polarized Fabry-Perot (CPFP) antenna is presented in this article. This employs a two-layer partially reflective surface (PRS) with positive phase gradient, which can improve the 3-dB gain bandwidth of (FP) antennas effectively. To generate (CP) wave, wideband CP microstrip patch designed to serve as feeding source. validate concept, an prototype at X band fabricated. The measurement results show that achieves 28.3% from 8.8 11.7 GHz peak 14.7 dBi....

In this paper, a multiple stubs loaded ring resonator (MSLRR) is proposed to design directly coupled multi-band bandpass filters (BPFs) with mixed electric and magnetic coupling (MEMC). The MSLRR exhibits multiple-mode resonant behavior. increased number of excite many more useful modes, but these modes can be still independently controlled. As examples, dual-band BPF, tri-band quad-band quint-band BPF using different types MSLRRs are designed fabricated. passband frequencies return losses...

This communication presents an a cylindrical active frequency selective surface (AFSS)-based electronically beam-switching antenna, which can operate at two different bands. The antenna consists of slot AFSS and omnidirectional dual-band feed antenna. p-i-n diodes the be switched on or off to reconfigure as transparent opaque incident electromagnetic waves, respectively. Thus, by controlling dc bias voltages columns diodes, directive beams swept cover whole azimuth plane. To validate design...

This paper presents a novel sequentially rotated patch array antenna with dual circular polarizations (CP). The present design has the advantages of compact size, simple feed networks, low cross polarization, and high isolation. radiating elements are linearly polarized (LP) equilateral triangular patches hybrid feeds. vertical polarization (VP) is obtained by using an aperture-coupled horizontal (TIP) proximity feed. These two feeds orthogonally positioned printed on different PCB layers,...

In this paper, a lumped-element dual-resonance resonator (LE-DRR) is proposed to design dual-band bandpass filter (DB-BPF) and reconfigurable filters. Two resonant modes of LE-DRR are controlled by two diverse branches. The mixed electric magnetic coupling (MEMC) implemented capacitors provide one inductor employed in the filters design. As an example, 0.9/1.57-GHz DB-BPF with 3-dB fractional bandwidth (FBW) 22.2%/11.8% designed firstly. A independently passbands then designed. measured...

A triband antenna with high gain and low profile is proposed. This based on the concept of Fabry-Perot cavity (FPCA) three resonances are obtained by employing two frequency selective surface (FSS) layers. Two FSS layers lead to resonant frequencies making each layer satisfy condition cavity. The third exploiting combined effects together. operating principle this proposed explained achievable range investigated. It shown that method enables all be independently tuned within certain range....

A novel dual-polarized antenna with very low profile using nonuniform metasurface is presented in this letter. The proposed composed of two dipoles placed crosswise, which the radiators are formed by four square metal plates. designed to work at lower frequency band (0.69-0.96 GHz) base station. By adding atop dipole antennas, overall height together can be reduced 0.1 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> (wavelength center...

This paper proposes a novel transmitarray antenna which can achieve high gain and produce dual-mode orbital angular momentum (OAM) beams in <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Ku</i> -band. Two back-to-back wideband dual-polarized microstrip antennas are employed as the unit cells, connected using metalized via holes. Full 360° phase ranges be obtained by varying length of feeding lines two orthogonal polarizations. Due to...

This publisher’s note contains a correction to Opt. Lett. 50 , 241 ( 2025 ) 10.1364/OL.536982 .

Amyotrophic Lateral Sclerosis (ALS) is a fatal neurodegenerative disease characterized by progressive degeneration of motor neurons, marked complex pathological mechanisms and lack effective treatments. Despite substantial global research efforts, no comprehensive bibliometric analysis has systematically mapped the evolution ALS biomarkers, therapeutic targets, pharmacological advancements. This study, based on 4,250 publications retrieved from Web Science Core Collection (2005-2025),...

To analyze scattering fields from moving conducting bodies, a novel Lorentz finite-difference time-domain (FDTD) method is proposed in this paper. The transformation formulas of electromagnetic field parts, space and time variable are gained by using between the rest reference frame. calculate total-field–scattered-field boundary condition set up to introduce an incident plane wave Using interpolation method, relation frame that related grids estimated. Lorentz-FDTD one-dimensional surface....

A new ultra-wideband (UWB) rectangular dielectric resonator antenna (DRA) with band-stop performance is proposed. Two symmetrical short-circuited strips together a slot etched in the feeding patch are introduced to form notched band. The design principles of proposed methods described detail. measured result demonstrates that DRA achieves an UWB bandwidth from 3.6 12 GHz for voltage standing wave ratio <2 band 5.1 6.0 GHz.

A novel Lorentz finite-difference time-domain (FDTD) method was proposed to analyze scattered fields from moving complex dielectric in this letter. Different other methods, we present a special way introduce the incident plane wave system. The are transformed system rest of with transformation and linear interpolation technique. Numerical results verify accuracy validation calculate slabs.

This letter presents a broadband 3-D-printed circularly polarized (CP) spherical Luneburg lens (LL) with the linearly feed antenna for X-band. In order to implement spatially continuous varying effective refractive index (RI), proposed LL is divided many unit cells and their RI simulated calculated by medium theory. Since of anisotropic two orthogonal (LP) waves, an LP CP polarizer realized properly selecting radius LL. The whole structure fabricated low cost 3-D-printing (3DP) technic,...

An integrated ultrawideband (UWB) and narrowband (NB) rectangular dielectric resonator antenna (DRA) is presented. The proposed consists of a UWB DRA excited by bevel-shaped patch an NB strip. measured results demonstrate that the provides 2:1 voltage standing wave ratio (VSWR) bandwidth for 2.4-12 2.3-4.5 GHz, respectively, with same polarization. Moreover, two symmetrical short-circuited strips are introduced to improve isolation between ports. This can be suitable candidate applications...