An approach for the bandwidth enhancement of a polarization rotating frequency selective surface (FSS) based on substrate integrated waveguide (SIW) technology is proposed in this communication. Compared with previously reported FSS, passband FSS enhanced from 4.6% to 7.2% by introducing triple-mode SIW cavity resonator as periodic element. Meanwhile, better response selectivity filtering performance achieved. The made up array novel resonators two orthogonal slots front and back surfaces...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> For electrically large complex electromagnetic (EM) scattering problems, huge memory is often required for most EM solvers, which too difficult to be handled by a personal computer (PC) even workstation. Although the multilevel fast multipole algorithm (MLFMA) effectively deals with problems some extent, it still time and consuming very objects. In order further reduce CPU requirement, hybrid...

In this paper, a 37-42.5GHz (N260 Band) 64 channel full-digital multi-beam array for 5G massive multiple input output (MIMO) applications is developed. The built on time division duplexing (TDD) architecture in which the transmitter and receivers are independent working separately to enable more flexible configuration hardware distribution. antenna elements of aligned way that 16 lie horizontal 4 vertical direction deliver higher beam resolution plane. By using cables unequal lengths, ×...

Abstract An integral equation‐based overlapped domain decomposition method (IE‐ODDM) is presented for the analysis of three‐dimensional (3D) electromagnetic scattering problems. Compared with forward and backward buffer region iterative proposed by Brennan et al., convergence IE‐ODDM faster due to edge‐effect current in each subdomain being effectively depressed. Moreover, sequence among subdomains more flexible, which means that asynchronous iteration even parallel computing are doable....

In this paper, a full realization of the higher order method moments (HMoM) with parallel out-of-core LU solver on GPU/CPU platform is presented in detail, mainly including three parts: first part, both global-auxiliary table and local-auxiliary are introduced for reducing lot tedious repetitive calculations, then GPU-oriented programming proposed optimized. second an overlapped grouping all curved quadrilaterals proposed. With scheme, submatrices can be efficiently generated one by without...

A new method for analysis of multiscale problems using the multilevel fast multipole algorithm (MLFMA) is proposed. In this method, MLFMA bears main part computation at macro level, while some FFT-based responsible on subregion with liner meshes. With strategy, a reasonable balance between computational efficiency and storage can be achieved in case when local regions tiny geometry features are relatively centralized. The has been compared several existing methods, including hybrid LFFIPWA,...

A cubic polynomial inter/extrapolation method is investigated to improve the accuracy of matrix over a frequency band in moments (MoM). In method, error MoM Frobenius norm can be expressed as product coefficient and component. The insensitive positions samples operating frequency, hence it practical minimize amplitude component rather than by optimizing samples. Actually, attains minimum when are analytically terms roots Chebyshev degree 4. Numerical examples presented validate proposed method.

In this paper, a novel realization of the Integral Equation in combination with fast Fourier transform for CFIE is established by Fitting both Green's function and its Gradient onto nodes uniform Cartesian grid. The new method has been compared several existing popular FFT-based methods, including AIM, IE-FFT, p-FFT. accuracy proposed significantly higher than other not sensitive to grid spacing expansion order. outstanding merit that fitting procedure independent basis functions. Therefore,...

A new integral equation-based nonoverlapping domain decomposition method (NDDM) is proposed for analyzing electromagnetic (EM) scattering from electrically large PEC objects whose MLFMA models are too the user's computer to accommodate. The equation first built on entire surface, and surface partitioned into some subsurfaces. RWG functions used expand current surface. Then, each full-RWG function across boundary curve split two half-RWG unknown coefficients constrained by continuity (using...

In this paper, a method based on consecutive perturbation for the fast and accurate extraction of all useful surface- leaky-wave modes lossy layered medium is proposed. The algorithm consists two stages. first stage, according to relationship frequency variation between modes, lossless can be tracked by perturbation, with surface-wave at proper high as starting points. All are extracted modified dichotomy method. second loss performed, in which medium's increased step step. each both stages,...

A new accurate impedance matrix interpolation algorithm is proposed for frequency sweeps arising in the method of moments (MoM). Its performance optimized by specifying choice internal sample within a given band. The modified element employed this scheme product normalized and remaining part after factoring out dominant phase term, where means that highest frequency. Based on matrices at three samples derivative sample, over band are fast generated via interpolation. requires same storage as...

A microstrip asymmetric folded dipole antenna on chip is proposed in this paper. The construction of balun feed line adopted to provide wideband. new design procedure based the odd-even mode method calculate input impedance an strip presented. has advantage small size, low profile, cost, and so forth. measured results show that a miniaturized bandwidth more than 14.2% (VSWR<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mo>≤</mml:mo></mml:mrow></mml:math>2);...

A hybrid method of the volume integral equation-based overlapping domain decomposition and fast Fourier transform (FFT)-based (VIE-ODDM-FFT) using nested uniform Cartesian grid is proposed for analysis electrically large inhomogeneous dielectric objects whose usual algorithm models are too user's computer to accommodate. The equation first built in entire volumetric domain, then partitioned into some nonoverlapping geometric subdomains. SWG basis functions used expand equivalent electric...

In this paper, a novel realization of the FFT-based methods for EFIE with high accuracy is established by fitting Green's function onto nodes uniform Cartesian grid. Like IE-FFT, focus proposed method Green function, but new significantly higher than that IE-FFT. Some numerical examples are provided to demonstrate and efficiency method.

A novel kind of Buffa-Christiansen (BC) functions is developed for improving the surface combined field integral equation with impedance boundary condition (CFIE-IBC) from three-dimensional imperfectly conducting objects. With difference original BC function in wide use, dimensionless as RWG function, which makes <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</i> and xmlns:xlink="http://www.w3.org/1999/xlink">K</i> components resulting matrix...

A cube-based scheme of integral-equation-based overlapped domain decomposition method with multilevel fast multipole algorithm (IE-ODDM-MLFMA) is proposed for the analysis electromagnetic (EM) scattering problems. In this scheme, each bottom cube located either inside an iterative region or corresponding incident region, and regions are complementary to other from point view, which makes it convenient implement ODDM in frame MLFMA. Numerical examples presented validate scheme.

A Hermite inter/extrapolation scheme is proposed for fast-generating the matrices of method moments (MoM) over a frequency band. In this scheme, positions two samples within band are optimized. As result, range between these subband entire The inside generated by interpolation, and those outside extrapolation. optimized can be expressed in analytical forms. Numerical examples presented to validate scheme.

An upgraded adaptive cross approximation (U-ACA) algorithm in complex field is proposed, including detailed discussion about both relative-error estimator and pivoting threshold. Two new estimators are constructed, the range of threshold determined theoretically. Besides, a statistical analysis U-ACA for computational electromagnetics provided to identify credibility existing ones. The experiments show that with either two more robust at present applications electromagnetics, compared...

This paper presents an approach of characterization substrate material using complementary split ring resonator (CSRR). Frequency selective surfaces made from CSRR are excited with free space radiation. The dielectric properties can be extracted resonant frequencies and transmission loss at frequencies. In order to verify the proposed method, complex permittivity Silicon is measured 110GHz 180GHz by backward-wave oscillator (BWO) spectrometers. And measurement results show that remain almost...

The inter/extrapolation accuracy of the cubic polynomial method has been improved by optimizing three frequency samples for frequency-sweeping in moments (MoM).In method, are optimized minimizing global maximum component at stationary points and two terminal band.The optimal can be expressed as analytical forms points.Numerical examples presented to validate proposed through comparison with Padé approximation.

An overlapped domain decomposition method (ODDM) combined with the field integral equation (CFIE) impedance boundary condition (IBC) is investigated for efficiently analyzing electromagnetic scattering by 3-D imperfectly conducting objects. When solving each subdomain, only parts of matrices need to be stored into memory. Hence, storage in proposed much smaller an electrically large object than that moments (MoM). Since spurious edge effect currents effectively depressed using buffer region,...

A new realization of the volume integral equation (VIE) in combination with fast Fourier transform (FFT) is established by fitting Green’s function (FG) onto nodes a uniform Cartesian grid for analyzing EM scattering from inhomogeneous nonmagnetic dielectric objects. The accuracy proposed method same as that P-FFT and higher than AIM IE-FFT especially when increasing spacing size. Besides, preprocessing time obviously less Numerical examples are provided to demonstrate efficiency method.

Abstract A new scheme of the integral equation fast Fourier transform for combined field applied to electrically large objects is presented in this article. Lagrange interpolation gradient Green's function on regular Cartesian grids, which similar method interpolating function. Compared with operator acting interpolated function, present can provide higher accuracy slightly more storage. The error analysis and some numerical examples are provided demonstrate efficiency proposed scheme. ©...

To control the multiple beams in MIMO communication, paper investigated three topology of antenna array. Linear array and planar formed different direction. Concentric circles were proposed to reduce first side lobe level. Distance between elements influence on radiation pattern was also discussed. All arrays fed by Butler network amplitude phase elements. It verified that project feasible effective ADS simulation.