A fully planar wireless power transfer (WPT) system via strongly coupled magnetic resonances is presented. In it, both the transmitter and receiver are planarized with use of coplanar printed spiral coils (PSCs) a loop. An equivalent circuit model proposed WPT derived to facilitate design, flowchart provided for optimization given size constraints. To realize high peak efficiency, quality factor individual loop or resonator, mutual coupling between resonators, frequency splitting phenomenon...

In this paper, the radial point interpolation method, one of meshless numerical techniques that has recently emerged in area computational electromagnetics, is extended to three dimensions for time-domain electromagnetic modeling. Its capabilities conformal and multiscale modeling arbitrary geometries over conventional grid-based are numerically validated evaluated. A general approach determining stability condition method described. Consequently, study presents another possible automatic...

An one-step arbitrary-order leapfrog alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method is presented. Its unconditional stability analytically proven and numerically verified. numerical properties are shown to be identical those of the conventional ADI-FDTD LOD-FDTD methods. However, its computational expenditure found lowest. In other words, in comparison with methods, leap-frog retains modeling accuracy but higher efficiency.

An innovative wideband omnidirectional horizontally polarized (HP) antenna is presented for 4G Long Term Evolution (LTE) wireless communication and networking systems. The proposed planar consists of four pairs flag-shaped radiators, a balun balance-unbalance transformation, parasitical strips bandwidth enhancement. Such design enables in-phase axially symmetric current flowing along the radiators. measurements show that HP exhibits relative 41% with return loss greater than or equal to 10...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, an unconditionally stable mesheless method is proposed with the implementation of leapfrog alternating-direction-implicit scheme in 3-D radial point interpolation meshless method. The unconditional stability analytically proven and numerically verified. accuracy efficiency are assessed through experiments. Compared conventional method, computational cost can be saved by 85% little...

One of the major hurdles that prevent recently developed alternating-direction-implicit finite-difference time- domain (ADT-FDTD) method from being widely used is its relatively large computational expenditures due to sub-step computations. To address issue, a reformulation unconditionally stable one-step leapfrog ADI-FDTD and comparisons with other FDTD methods are presented in this letter. It found requires less amount memory CPU time than current similar requirement (when step chosen be...

A new convolutional perfectly matched layer (CPML) is proposed and implemented in one-step leapfrog alternately direction-implicit finite-difference time-domain (ADI-FDTD) method. Different from the previous developed layers (PMLs) used ADI-FDTD methods, PML has same form as that for conventional FDTD method, requiring only computations of CPML auxiliary quantities. Stability verified semianalytically its high absorption efficiency proven numerically. The then applied to a number...

Although meshless methods, in particularly those with scalar radial basis functions (RBFs), have been applied effectively to solve electromagnetic problems, their solutions may not be always divergence free source-free regions, resulting possibly large errors. In this paper, a new vector RBF based method, which is free, proposed for solving transient problems. Its properties are investigated and compared of RBFs; they further verified numerical examples that present good accuracy.

SUMMARY Meshless methods are a promising new field in computational electromagnetics. Instead of relying on an explicit mesh topology, numerical solution is computed unstructured set collocation nodes. This allows to model fine geometrical details with high accuracy and facilitates the adaptation node distributions for optimization or refinement purposes. The radial point interpolation method (RPIM) meshless based basis functions. In this paper, current state RPIM electromagnetics reviewed....

A novel planar wireless power transfer (WPT) system using strongly coupled magnetic resonance is proposed. Additional layers of printed spiral coils (PSCs) are applied to the transmitter/receiver resonator 4‐coil WPT improve quality factor and transmission efficiency. In addition, by connecting multilayer resonators together conductive shorting walls, efficiency further improved. Five systems coplanar PSCs loops have been investigated. The measured results show that proposed design with two...

The time-domain radial point interpolation (RPI) meshless method has the advantage of conformal modeling a structure with non-uniformly distributed nodes; however, time step used is still restricted by stability condition or distances between nodes. to be small and computational can long when nodes are small. In this paper, an unconditionally stable scheme using weighted Laguerre Polynomials introduced into method. result always-stable RPI method; it retains advantages both node-based...

A novel magnetically-coupled resonant wireless power transfer (MCR-WPT) system using an array of printed spiral resonators is presented. By replacing the single transmitting resonator in a conventional MCR-WPT with smaller resonators, efficiency planar WPT both over-coupled and under-coupled regions are significantly enhanced. Furthermore, proper design driving loop, proposed able to provide consistent even when receiver axially misaligned transmitter. Two systems size 10×21 mm <sup...

A low-profile broadband omnidirectional multiple-input and multiple-output (MIMO) antenna with dual polarization is presented, which provides diversity for the 4G Long Term Evolution (LTE) communication systems, networks, base stations. It consists of two orthogonally polarized radiating elements separate feeds. The horizontally-polarized element comprised four pairs flag-shaped dipoles, parasitical strips, a balun tapered striplines balance-unbalance transition. has fractional bandwidth 55%...

A dual-polarized multiple-input-multiple-output (MIMO) antenna integrated with electromagnetic band-gap (EBG) is proposed. The MIMO consists of two (0 ◦ and 90 polarizations) elements. Each element includes four symmetrical arc-shaped slots. mushroom-shaped EBG structure slots at its fringe designed to enhance the gain antenna. bandwidth (return loss > 10 dB) proposed from 5.70 5.93 GHz, peak 5.45 dBi. isolation between ports adjacent elements can be as small less than �20 dB. has a compact...

We propose a systematic approach to accurate imposition of material interface conditions for the meshless radial point interpolation method (RPIM). A new set equations updating fields at interfaces is derived. piecewise polynomial and modified basis function are proposed applied account field discontinuities near interfaces. In contrast previous work, incorporates properties reduces geometrical dependence function. Numerical results show that significantly improves simulation accuracy RPIM...

A novel magnetically-coupled resonant wireless power transfer (MCR-WPT) system using an array of printed spiral coil (PSC) resonators is presented to expand the receiving area. The resonator excited with a single planar driving loop yield uniform magnetic field distribution at receiver plane. First, performance conventional transmitter consisting one transmitting and multiple repeaters without frequency tracking investigated. Then proposed PSC feed strategy demonstrated. results show MCR-WPT...

The numerical dispersion of the time-domain radial point interpolation meshless (RPIM) method is investigated in this letter. It found that relationship RPIM shares same form as a second-order central finite-difference but with additional factor introduced by basis functions, when i) two methods deploy nodal distribution for problem-domain discretization and ii) local support domain defined to enclose only four adjacent nodes. Such an observation indicates more general can be reduced...

A meshless method with local radial basis functions is proposed for solving the time-domain electromagnetic wave equations. In comparison conventional point interpolation (RPIM) that employs and positions dual sets of nodes both electric magnetic field nodes, uses only one set where fields are also collocated in space. With this feature, implementation complexity RPIM significantly reduced, conformal modeling muti-scale capabilities can now be further explored higher efficiency. The...

A novel planar resonant coil elements for the 3×3 array in multi-layer structure is proposed wireless power transmitter. Both simulation and measurement results reveal that comparison with conventional of transmitter, transfer efficiency does not vary significantly when receiver moved along plane parallel to transmitter from 50mm 80mm. The fluctuates between 57.81% 64.95% measurements at covering charging area; it indicates successful establishment uniformly field desired a practical application.

Safety status of artificial slopes is significant for the operation and maintenance highway to mitigate risk; thus, slope hazard identification necessary. In order realize large-area low-cost application regional highway, taking Longqing Highway (length 55 km) as a case study, SBAS-InSAR (Small Baseline Subset-Interferometric Synthetic Aperture Radar) technique adopted detect ground deformation conduct based on dip, aspect, geological data historical record. Field survey carried out verify...

Meshless methods have recently emerged as robust numerical techniques for electromagnetic modeling in time domain. In those methods, a problem domain is represented by scattered spatial nodes instead of meshes, thus the conformal boundaries and solution refinements can be conveniently achieved. However, CFL-like stability condition still exists with these meshless which prevents being efficiently applied general simulations. To overcome problem, this paper, we propose unconditionally stable...

A novel wireless power transfer system using strongly coupled magnetic resonances is proposed. In the proposed design, both transmitter coil set and receiver are fully planar, comprising of two printed spiral resonator coils co-planar source load loops. Comparisons in quality factor efficiency design with self-resonant spirals capacitor-loaded made. addition, planar small inductances also discussed. Measurement results show that exhibits a 74.1% at distance 200 mm. The structure high make...

A planar dipole antenna is loaded with LC‐tank resonators and chip resistors presented for ultra‐wideband (UWB) radar communication systems. Each staircase rectangular arm of the proposed an open complementary double concentric split‐hexagonal‐ring resonator (LC‐tank) a pair at end bandwidth enhancement, whereas broadband microstrip to parallel‐plate transformer (or balun) applied as feeding structure provide impedance matching well balanced–unbalanced transition. The measurement results...

The convolutional perfectly matched layer (CPML) is developed for alternating-direction-implicit (ADI) radial point interpolation meshless method (RPIM). presented node-based CPML provides efficient absorption of outgoing electromagnetic waves from a truncated computational region the ADI-RPIM method, and thus extends unconditionally stable modeling to open-region scattering radiation problems. unconditional stability effectiveness are verified through numerical experiments.