This paper presents a novel fractal defected ground structure (FDGS) to reduce mutual coupling between coplanar spaced microstrip antenna elements. The of the proposed FDGS is studied. Bandgap characteristic second and third iterative achieved. FDGSs are used Mutual reduction performance better than that FDGS. And dimension can be decreased by using higher level fabricated measured. Simulated measured results both show more 35-dB obtained Moreover, envelope correlation elements with quite...

A new technique to design single-feed circularly polarized (CP) microstrip antenna is proposed. The CP radiation obtained by adjusting the dimension of etched fractal defected ground structure (FDGS) in plane. Parameter studies FDGS are given illustrate way achieve radiation. antennas with second and third iterative fabricated measured. measured 10-dB return-loss bandwidth about 30 MHz (1.558 1.588 GHz), while its 3-dB axial-ratio 6 (1.572 1.578 GHz). gain across band between 1.7 2.2 dBic.

A novel S-shaped periodic defected ground structure (PDGS) is proposed to reduce mutual coupling between antenna elements. Coplanar placed elements work at the same frequency band with centre 2.57 GHz. Centre-to-centre distance 50 mm which ∼0.43λ. The PDGS three units microstrip By using PDGS, more than 40 dB reduction achieved.

In this communication, a novel broadband dual circularly polarized (CP) antenna is presented. This consists of an U-shaped slot to achieve CP radiation and two 50-Ω microstrip-fed ports realize both right-hand circular polarization left-hand at the same frequency band. The axial ratio bandwidth (ARBW) greatly broadened by moving feeding upper portion slot. To verify design, proposed fabricated measured. measured -10 dB reflection coefficient about 114.4% (1.80-6.61 GHz) 3-dB ARBW...

In this letter, a novel coding metasurface (CM) based on low <i>Q</i> resonators and fast optimization method is proposed to achieve wideband radar cross section (RCS) reduction of the microstrip antenna array (MAA) while maintaining its radiation properties. Theoretical analysis reveals relationship between value phase shift resonator, which indicates that control reflected wave can be achieved with resonator. Moreover, convolution theorem proposed, enhances efficiency matrix. Finally, CM...

Cancer phototherapy indicates advantages in ease of manipulation, negligible drug resistance, and spatiotemporal control but is confronted with challenges tumor cell accessibility intermittent light excitation. Herein, we propose a strategy persistent luminescence (PL)-excited photothermal therapy (PTT), concurrent thermophoresis-propelled motion, PL-triggered NO release, where PL emission chargeable by ultrasonication for readily applicable to deep tumors. Mechanoluminescent (ML) nanodots...

The bottom hole transport layers (HTLs) are of paramount importance in determining both the efficiency and stability inverted perovskite solar cells (PSCs), however, their surface nature properties strongly interfere with upper crystallization kinetics also influence interfacial carrier dynamics. In this work, we strategically develop a simple, facile spontaneous fabrication method HTL at perovskite/electrode interface by dynamic self-assembly (DSA) small molecules during crystallization....

The rapid detection of distracted driving behaviors is crucial for enhancing road safety and preventing traffic accidents. Compared with the traditional methods distracted-driving-behavior detection, YOLOv8 model has been proven to possess powerful capabilities, enabling it perceive global information more swiftly. Currently, successful application GhostConv in edge computing embedded systems further validates advantages lightweight design real-time using large models. Effectively...

A unidirectional broadband circularly polarized (CP) crossed-dipole antenna is presented in this communication. This has a simple feeding structure, which uses an unequal power network. It can simply realize 90° phase shift and four equal divisions. The study of the performance with different geometric parameters been conducted. Working band designed covers BeiDou Navigation Satellite System, GPS, GLNOSS bands. An optimized measured, measured results agree well simulated results. show good...

This study was carried out to evaluate the spectroscopic, molecular properties, and in silico biological assessment of 2-Hydroxyl-5-Nitrobenzaldehyde (NSA) characterized by FT-IR, UV, NMR spectral, first-principle density functional theory (DFT). The optimized geometry, vibrational wavenumbers, infrared intensities activities were calculated using (DFT) B3LYP method with a 6–311++G(d,p) basis set. detailed interpretation spectra assigned VEDA program. results NBO analysis show that LP(3)O12...

A novel compact dual-wideband, dual-sense, circularly polarized (CP), square slot antenna with the simple structure is presented in this communication. The right-hand circular polarization +z-direction for lower frequency mainly realized by an inverted L-shaped strip, and left-hand upper achieved offset feed structure. parasitic matching stub helpful to improve input impedance matching. overall dimension of prototype only 50×50×1 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

In this paper, a hybrid mechanism metasurface (HMM) that incorporates absorption, polarization conversion and phase cancellation mechanisms is proposed for wideband wide-angle radar cross section (RCS) reduction. The absorber (PCA) by embedding the lumped resistors into structure, which integrates absorption mechanisms. Then, employed to redirect scattering energy non-incident directions through chessboard configuration, exploits opposite between PCA its mirror structure. Unlike previous...

A series of organic benzothiadiazole (BT) derivatives as electron transport materials with simple synthesis and facile fabrication to modulate perovskite buried interfaces charge collection efficiency in solar cells is reported.

A dual‐band dual‐sense circularly polarised (CP) square slot antenna is presented. The proposed consists of a L‐shape patch and two rectangular strips around opposite corners on the lower ground. By adjusting size them, broadband CP can be obtained. It radiate right‐hand circular polarisation at 3.0 GHz left‐hand 5.5 + z direction. measured results impedance bandwidths for S 11 &lt; −10 dB are 38.8% (2.51–3.72 GHz) 27.5% (4.83–6.37 GHz). 3 axial ratio 37.4% (2.50–3.65 16.3% (5.02–5.91

In this article, a low-profile high-efficiency dual-band 0.915/2.45 GHz circularly polarized (CP) antenna and its array are designed for radio frequency identification (RFID) reader applications. First, element is introduced to achieve dual-sense CP radiation using two pairs of crossed-dipoles the first time. The right-hand (RHCP) wave at lower band mainly produced by first-order mode on longer dipole, while left-hand (LHCP) upper generated combination shorter dipole third-order dipole. An...

Metasurface provides an efficient method to regulate wave propagation in multiphysics fields ranging from light waves, electromagnetic (EM) and acoustic waves. Considering the versatile demands practical scenarios, essential challenge is design metasurface with spectral compatibility satisfy various applications. Here, we proposed optically transparent hybrid mechanism (HMM) incorporating absorption, polarization conversion, phase cancellation mechanisms for wideband, wide-angle,...

This paper presents a novel W-shaped parasitic strip to design the circularly polarized (CP) simultaneous transmit and receive antennas reduce mutual coupling (MC) between them. By disturbing current fields inducing distribution on antenna patches, CP radiation MC reduction are achieved. The designed have 30 MHz 10 dB impedance bandwidth, 16 3 axial ratio approximate 5.08 dBic peak gain. technique also reduces from -7 -50 when placed with 0.18λ <sub...

A simple and novel reconfigurable dual-band dual-circularly polarized (CP) cavity backed high-gain antenna for vehicle global navigation satellite system (GNSS) is first reported in this paper. This design consists of a planar printed monopole with four branches, pin-diodes modified cavity. Four are used to control the length these branches. By asymmetrically changing states diodes, can resonate both right-hand circular polarization (RHCP) wave left-hand (LHCP) at two bands. An elliptical...

Abstract The repair of bone defects remains a major challenge in the clinic, and treatment requires grafts or replacement materials. Existing biomaterials have many limitations cannot meet various needs clinical applications. To treat defects, we constructed nanohydroxyapatite (nHA)/methylacrylylated silk fibroin (MASF) composite biological scaffold using photocurable 3D printing technology. In this study, scanning electron microscopy (SEM) was used to detect changes morphological structure...

In this paper, uniform hydroxyapatite (HA) nanowires of width 60 nm and length 1 µm are synthesized by solvothermal synthesis. The formation process the has been elaborated from structure within reverse micelles time-resolved fluorescence quenching technique. results reveal that amorphous nuclear/surfactant complex electrostatic field maintain unidirectional, irreversible fusion micelles, leading to growth in one direction. synthesis, pressure generated autoclave is estimated. suggest...