Space-time-modulated metasurfaces can manipulate electromagnetic waves in space and frequency domains simultaneously. In this article, an analytical design of space-time-modulated with modulation elements composed two paths, In-phase (I) Quadrature (Q), is proposed. The model derived analytically, the space-/frequency-domain manipulations are achieved by designing dimension time sequence I Q paths. specular reflection direction, objective shift reflected first-order harmonic be obtained....

A metasurface (MTS)-based direction of arrival (DoA) estimation method is presented. The exploits the properties space–time modulated reflective metasurfaces to estimate in real-time impinging angle an illuminating monochromatic plane wave. approach makes use amplitude unbalance received fields at broadside frequencies two first-order harmonics generated by interaction between incident wave and metasurface. Here, we first describe analytically how generate desired higher order reflected...

Abstract Objectives A patient with extensive atrophy of the alveolar ridge in posterior portion maxilla was selected to complete an experimental and clinical case robotic zygomatic implant investigate viability system use. Methods The preoperative digital information collected, implantation position personalized optimization marks needed for robot surgery were designed advance a repair-oriented way. resin models patient’s mandible are all printed 3D. Custom-made special precision drills...

As engineered electromagnetic covers based on (space-) time modulated metamaterials and metasurfaces, Doppler cloaks are able to compensate the effect induced by motion of a scatterer, making it appear as if were at rest detecting radar system. Perfect compensation can be theoretically always achieved for any relative velocity direction cloaked scatterer with respect However, still detected from cross section variation especially under oblique incidence illumination. The challenge is,...

We propose a plasmonic platform for achieving out-of-plane quadrupolar surface lattice resonances (SLRs) with large quality factors. The proposed is composed of horizontal metal–insulator–metal (MIM) grating embedded in homogeneous dielectric environment. Numerical results based on rigorous coupled-wave analysis show that under oblique incidences, high- Q SLRs can be excited at wavelengths 1242 nm over wide range insulator widths, and the factor reach 1036. As comparison, same conditions,...

The phase information of the echo is essential for inverse synthetic aperture radar (ISAR) imaging. Time-modulated metasurface (TMM) generates time-varying reflection that can modulate echo, thus enabling jamming ISAR imaging, which has great potential real applications. In practice, covering whole target with TMM difficult to achieve. Consequently, model a partially covered developed, extends fully more general and near-realistic case in this letter. Then, echoes each component are obtained...

This article presents a new design of diverse frequency time modulation for linear frequency-modulated (LFM) radar passive false target spoofing. To realize the modulation, modulated metasurface is designed accordingly, which composed by set elements, each independently time-modulated to specific targets in high-resolution range profile (HRRP) system. Due control scheme element and combined response overall surface, we demonstrate capability several patterns consisting single multiple...

This research investigates a complex n order cascading circuit network with embedded horizontal bridge circuits the N-RT method. The contents of study include equivalent resistance analytical formula and impedance characteristics network. idea is as follows. Firstly model n-order established, fractional difference equation derived using Kirchhoff's law. Secondly, transformation method employed to transform into simple linear equation, its particular solution computed. Then used derive...

An electromagnetic (EM) metasurface is a passive device capable of manipulating the reflected signal radar in both spatial and frequency domains. This paper presents novel analytical design EM scattering center model guided synthetic aperture (SAR) deception based on diverse time-modulation. The objective this to disguise real target as an intended deceptive conceal its original characteristics. To achieve this, we first extract express SAR image analytically. determined by number, amplitude...

The existing isotropic model equations of hysteresis in magnetic materials have been extended to include the effects anisotropy and texture. This has proved particularly important as used describe an increasing range which plays a significant role, for example hard materials. It found that texture polycrystalline can be adequately described by modifying equation anhysteretic curve account these effects.

Abstract Complex n -order complex impedance network is a kind of common problems. The electrical characteristics its equivalent are usually complex. We consider model two terminal ladder with parameters, and investigate the by deriving analytical formula impedance. main research methods as follows: firstly, constructed. Secondly, nonlinear difference equation established according to model, then universal law -ladder given studying solution equation. Finally, specific cases LC non-ideal...

Frequency selective surface (FSS) is of great research interest for its wide applications in radome, absorber, electromagnetic filters, and artificial bandgap materials. In order to achieve a multifunctional FSS with real-time manipulated radar cross-section (RCS), there are mainly three ways, i.e. design reconfigurable unit cell, screen, combination cell screen. this work, both the cells screen proposed realize dual-band absorber RCS. For an angular ring meander cross dipole combined obtain...

Abstract Here the problem of equivalent resistance general 2 × n ‐order resistor networks with four different parameters is investigated, and innovations in theory method are made. Here, second‐order matrix equation model boundary condition established by RT‐I technique (recursion–transform based on current parameters), solution special given using transformation method. The distribution law circuit obtained, three formulas obtained. Finally, analyzing discussing case conclusion,...

This article proposes a class of periodic and asymmetric 2 × n resistor network model, adopts the RT-V theory to conduct in-depth research on this problem, achieving new theoretical breakthroughs. study derived three original equivalent resistance formulae for complex circuit network, also discusses analytical expressions in different special cases, verifying that conclusions cases are completely consistent with actual or previous existing conclusions, indirectly correctness results obtained...

In this article, we propose a multifunctional space–time-modulated metasurface (STM-MTS) able to perform simultaneously direction of arrival (DoA) estimation and radar cross section (RCS) manipulation in single system. The consists an alignment unit cells, whose scattering response can be dynamically controlled transparent (full transmissive cell) or opaque reflective cell), according the amplitude modulating signal applied loading p-i-n diodes. DoA is performed behind metasurface, i.e.,...

This article proposes a class of periodic and asymmetric 2×n resistor network model, adopts the RT-V theory to conduct in-depth research on this problem, achieving new theoretical breakthroughs. study derived three original equivalent resistance formulae for complex circuit network, also discusses analytical expressions in different special cases, verifying that conclusions cases are completely consistent with actual or previous existing conclusions, indirectly correctness results obtained...

A novel concept is introduced here for thwarting the linear frequency modulated (LFM) radar's susceptibility to false target jamming. This innovative approach involves creation of a non-uniform time-modulated metasurface (NF-MTS). The NF-MTS consists numerous distinct elements, each undergoing individual temporal modulation at varying frequencies. intricate system empowers generation spurious targets strategically positioned within range profile. capability control patterns element, coupled...

A continuously tuned single-longitudinal-mode (SLM) Ho:YLF laser around the P12 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi mathvariant="normal">C</mml:mi> mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> absorption line was demonstrated. The continuous tuning range of 5.75 pm within one longitudinal mode spacing resonator realized by using a novel intra-cavity wedge...

We report narrow quadrupolar surface lattice resonances (SLRs) under normal incidence, and the observation, for first time, of band reversal effect SLRs supported by a vertical metal-insulator-metal nanograting, which is embedded in homogeneous dielectric environment. Simulation results show that SLR with linewidth 1~nm high quality factor 979 can be excited near-infrared regime, oblique out-of-plane dipolar relatively large factors (>=150) launched. By varying incidence angle, wavelength...