A dual-layer metal-only Huygens' unit is presented, which consists of double antisymmetric multislot structures without relying on expensive dielectric substrates to achieve a complete 360° phase and high transmission amplitude (−2 dB). Also, the design strategy incorporates extra magnetic resonance, enriches Huygens allows more degrees freedom exploit second harmonic for center frequency multiplication. In order verify scheme, an 18 × transmitarray prototype created by laser engraving, two...

In this letter, a broadband and wide-angle linear-to-circular polarization converter (LCPC) based on three-layer transmissive metasurface is proposed, to solve the problem of efficiency degradation caused by mismatch in mobile microwave wireless power transmission (MWPT). The simulated results show that our proposed model has an axial ratio (AR) less than 3 dB 4.24-6.24 GHz band (38.17% bandwidth) with maximum insertion loss (IL) 1.66 for normal incidence both <italic...

This letter demonstrates an inkjet-printed quasi metasurface (QMS) flexible harvester for microwave power transfer (MPT). The substrate and radiator are separately based on polyimide Eutectic gallium indium alloy (EGaIn), in which the mass fraction of Ga In 75.5% 24.5%, respectively). Due to high electromagnetic energy loss materials, electric field distribution is improved by etching transmission structure; consequently, material reduced. simulated results show that under vertical incidence...

This paper introduces a broadband flexible rectifier that employs Class-F harmonic suppression network (HSN), designed for efficient long-distance wireless power transfer in applications such as solar stations, sensor networks, and unmanned aerial vehicles. The is notably compact, with dimensions of 24 × 18 mm2. tapered transmission line used impedance matching, effectively bridging components different impedances, reducing reflections, broadening the operational bandwidth. HSN further...

In this article, a high-input power (>30 dBm) rectifier circuit for 2.45-GHz microwave wireless transmission is presented. To overcome the shortcomings of traditional Schottky circuit, novel designed based on GaAs field-effect transistor (FET) and diode together as rectification part. A system-level verification demonstrates that has potential application value system. Measurement results show higher input range MW-dc conversion efficiency are realized at same time by design scheme. The...

An automated design methodology of large-aperture broadband reflectarray is proposed by exploiting the unique properties circular cosine curve elements with slope frequency-phase (F-P) response that can be changed adjusting two degrees freedom. The single-layer miniaturized element (0.3λ) quadrantal symmetry provides phase range coverage 360° and negligible reflection loss for either dual-linear or dual-circular polarization. variable F-P facilitates optimal arrangement minimizing spatial...

We propose a multi-feed Huygens’ metasurface (HMS) transmitarray designed for microwave power transmission applications. A near-field distributed optimization mechanism is employed to determine the optimal focal lengths of subarrays. aim balance between illumination efficiency and interference from incident waves, leveraging conjugate field matching method precise phase compensation. This approach ensures robust radiation performance, notably reducing focus-to-diameter ratio large-aperture...

We present a novel phase modulation method for generating two-dimensional Airy vortex beams carrying orbital angular momentum (OAM) modes in microwave bands. This approach enhances the focal field intensity of non-diffracting OAM beam while simultaneously suppressing divergence at longer distance without compromising its nondiffractive property. By leveraging Fourier optics theory, we theoretically analyze propagation behavior EM waves and outline detailed design procedure. To achieve...

In the present study, a coupled numerical method is used to study EDZ (excavation damage zone) in deep schist tunnel. Two codes, Fast Lagrangian Analysis of Continua (FLAC) and Particle Flow Code (PFC) are implement simulation. The motive apply FLAC/PFC approach take advantage each modeling scheme while at same time minimizing requirement for computational resources. coupling realized through an exchange displacements, velocities, forces cycling step. Simulation results found be good...

In this letter, a novel impedance matcher (IM) is designed based on Zeta converter to overcome the shortcomings of other matching methods and improve load range in low resistances. System-level verification demonstrates that IM has potential application value for microwave wireless power transmission (MWPT) system. Measurement results show maximum conversion efficiency (PCE) rectifier with can reach 73% when input 32 dBm. addition, proposed circuit operate above 60% overall varies from 0.01...

A novel heptagonal rat-race hybrid coupler (RRHC) working at the fundamental frequency of 0.9GHz is proposed here, which can realize both miniaturization and harmonic suppression. The RRHC based on T-shaped structure top spiral defected ground (DGS) bottom occupies only 31.3% area a conventional RRHC. measurement result fabricated shows good agreement with simulation spurious response suppressed below 20 dB up to fourth harmonic.

We propose a method for directly constructing three-dimensional accelerating beams with twisted wavefront amplitude and phase profiles in real space. The design strategy combines the optical caustic antenna array theory to synthesize required distribution over transmitting aperture. constructed beam is further enhanced by translating superimposing desired trajectory. dynamics of resulting helical are analyzed using Fresnel diffraction through fast Fourier transform, revealing uniform...

In this article, an impedance-matching voltage regulator (IMVR) for high-power rectifier in microwave wireless power transmission (MWPT) is analyzed and fabricated, which designed based on Zeta converter linear [low dropout (LDO)]. System-level verification shows that the proposed novel IMVR has potential application value a MWPT system. Measurement results show design scheme realizes larger load range of constant output higher RF-to-dc conversion efficiency (PCE) while improving...

In this paper, a 5.8 GHz, high-gain flexible receiving antenna (FRA) is proposed, which can be used for wireless power transmission (WPT) systems. The FRA designed by an iterative process and etched on Kapton, with coplanar waveguide (CPW) feed. order to improve the gain of FRA, air-gap reflector are loaded, improved from 2.79 9.51 dBi at GHz. To validate stability fabricated prototype uses three configurations 80, 70, 50 mm. impedance matching keeps well, sustain above 8.96 dBi. addition,...

A newly proposed coupled-line low-pass filter structure is firstly integrated into rat-race coupler design in this paper for size reduction and harmonic suppression. This composed of dual parallel coupled-lines with one open stub at the end. By properly substituting unit cell (LUC) each six λ/4 sections conventional coupler, significant suppression can be achieved while property remains comparable to passband (f0=0.9GHz) 33% relative size. Transmission suppressed below -20dB from 2.5GHz...

Laboratory experiments and numerical simulations, using Particle Flow Code (PFC2D ), were performed to study the behavior of marble under tri-axial loading pre-existing fissure uniaxial compression. The laboratory compression results was analyzed, calibration micro-properties BMP (Bonded particle model ) in PFC2D with test data carried out successfully. simulated by smooth joint contact, cracking propagation mode calibrated properties single contact. simulation show that tensile crack...

In this letter, an inkjet-printed and flexible zero-index metasurface for microwave power transmission (MPT) harvester is proposed measured. The substrate conductor are separately based on polyimide liquid metal eutectic gallium indium (EGaIn) alloy in which the mass fractions of Ga 75.5% 24.5%, respectively. To accommodate complex MPT application environment, such as uneven surface receiving device movement harvesting target, energy has received attention research. However, practical...

In this paper, a phase expression is derived to calculate the compensation of each point on metasurface (MS), which then used generate focused beam with different elevation (θ) and azimuth (φ) angles. The simulation results show that can achieve both 1D 2D scanning. An MS an expected direction θ φ equal 45∘ fabricated using designed control unit. final measurement indicate be generated minimal error in desired direction. Furthermore, due focusing effect MS, more power concentrated...

In this paper, a metasurface antenna (MA) is designed for quasi nondiffraction beam size adjustment and microwave power transmission. A phase calculation expression derived to generate different spot sizes of generated beams. The result shows the can make electric field decay slower apply various polarization situations. At same time, measured demonstrates that we adjust by setting parameters ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...

In this paper, a novel approach is introduced towards an efficient Finite-Difference Time-Domain (FDTD) algorithm by incorporating the Alternating Direction Implicit (ADI) technique to Nonorthogonal FDTD (NFDTD) method. This scheme can be regarded as extension of conventional ADI-FDTD into generalized curvilinear coordinate system. The improvement on accuracy and numerical efficiency ADI-NFDTD over nonorthogonal algorithms carried out experiments. application in modelling Electromagnetic...

In order to solve the problem of ECG acquisition and processing better, this paper designs a portable tester, which uses SCM as core controller. Power basic frequency interference was removed by 50 Hz trap filter. harmonic interference, electrode polarization my electricity were low- pass Baseline drift high- At same time; we test performance circuit, filter circuit amplification circuit. As result, it is shown that system can well collect process signal.

Identification of operator handling characteristics has got the great attention many people, especially for intelligence machine. This article designs a manual tracking control experiment to analyze human characteristics. The whole system is composed by computer and joystick. simulate target ball’s movement, can reference ball joystick track ball. By changing speed identify effect .According record deviation data, achieved some operator: first, every time delay between he discovers operates...