ScholarBank@NUShttps://scholarbank.nus.edu.sgThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Sat, 05 Dec 2020 03:13:22 GMT2020-12-05T03:13:22Z50291- Corrections to "a fast analysis of scattering and radiation of large microstrip antenna arrays"https://scholarbank.nus.edu.sg/handle/10635/67881Title: Corrections to "a fast analysis of scattering and radiation of large microstrip antenna arrays"
Authors: Yuan, N.; Yeo, T.S.; Nie, X.C.; Li, L.W.
Thu, 01 Jan 2004 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/678812004-01-01T00:00:00Z
- Temasek laboratories efficient full-wave EMC (TLEFEMC VI.0) code for analysis of antennas mounted on large and complex platform: Introduction, validation, and applicationhttps://scholarbank.nus.edu.sg/handle/10635/111648Title: Temasek laboratories efficient full-wave EMC (TLEFEMC VI.0) code for analysis of antennas mounted on large and complex platform: Introduction, validation, and application
Authors: Wang, C.-F.; Nie, X.-C.; Yuan, N.; Gan, Y.-B.; Tay, B.H.; Tai, Y.K.
Abstract: Fast and accurate full-wave analysis of antennas mounted on large and complex platform is very useful and yet a challenging area in electromagnetic compatibility (EMC) assessment. This paper introduces our Temasek Laboratories (TL) efficient full-wave EMC (TLEFEMC V1.0) code for attempting to solve this challenging problem up to a certain frequency of interest This code is a great effort made by a team in TL at National University of Singapore (TL@NUS) in collaboration with DSO National Laboratories. The technical core of the TLEFEMC V1.0 code is the combination of surface-wire integral equation (SWIE) and precorrected-FFT (P-FFT) algorithm. Extensively numerical validation for small problems as well as applications to realistic targets has illustrated the capability of the developed code.
Tue, 01 Jan 2008 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/1116482008-01-01T00:00:00Z
- RCS computation for a large array of waveguide slots with finite wall thickness using the MoM accelerated by P-FFT algorithmhttps://scholarbank.nus.edu.sg/handle/10635/57193Title: RCS computation for a large array of waveguide slots with finite wall thickness using the MoM accelerated by P-FFT algorithm
Authors: Zhang, L.; Yuan, N.; Zhang, M.; Li, L.-W.; Gan, Y.-B.
Abstract: This correspondence presents an accurate and efficient method of moments (MoM) for analyzing electromagnetic scattering by a large finite array of waveguide slots with finite thickness. In this method, the mixed potential integral equation (MPIE) is utilized onto both upper and lower surfaces of the slots, and the subdomain MoM procedure is implemented to obtain the equivalent magnetic current distributions. The precorrected fast Fourier transform (P-FFT) method is employed to accelerate the entire computational process to reduce significantly the memory requirements for large arrays. During the MoM procedure, the Rao-Wilton-Glisson (RWG) functions are used as the basis and testing functions, with both z- and x-directional magnetic currents considered. This approach extends applicability of the present method to solve the MPIE for characterizing waveguide slots of arbitrary shape and distribution and the capability of the integral equation based fast algorithm. Numerical results are obtained and compared with the experimental results, to verify the accuracy and efficiency of this technique. © 2005 IEEE.
Thu, 01 Sep 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/571932005-09-01T00:00:00Z
- Analysis of scattering from composite conducting and dielectric targets using the precorrected-FFT algorithmhttps://scholarbank.nus.edu.sg/handle/10635/68126Title: Analysis of scattering from composite conducting and dielectric targets using the precorrected-FFT algorithm
Authors: Yuan, N.; Yeo, T.S.; Nie, X.C.; Li, L.W.; Gan, Y.B.
Abstract: A precorrected-FFT algorithm is presented for the calculation of electromagnetic scattering from conducting objects coated with lossy materials. The problem is formulated using an EFIE-PMCHW formulation, which employs the electric field integral equation (EFIE) for conducting objects and the PMCHW formulation for dielectric objects. The integral equations are then discretized by the method of moments (MoM). in which the conducting and dielectric surfaces are represented by triangular patches and the unknown equivalent electric and magnetic currents are expanded using the RWG basis functions. The resultant matrix equation is solved iteratively and the precorrected-FFT method is used to speed up the matrix-vector products in iterations as well as to reduce the memory requirement. Numerical examples are presented to validate the implementation and to demonstrate the accuracy of the method.
Wed, 01 Jan 2003 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/681262003-01-01T00:00:00Z
- A Fast Analysis of Scattering and Radiation of Large Microstrip Antenna Arrayshttps://scholarbank.nus.edu.sg/handle/10635/54125Title: A Fast Analysis of Scattering and Radiation of Large Microstrip Antenna Arrays
Authors: Yuan, N.; Yeo, T.S.; Nie, X.-C.; Li, L.W.
Abstract: An accurate and efficient method that combines the precorrected fast Fourier transform (FFT) method and the discrete complex image method (DCIM) is presented to characterize the scattering and radiation properties of arbitrarily shaped microstrip patch antennas. In this method, the mixed potential integral equation (MPIE) is discretized in the spatial domain by means of the discrete complex image method. The resultant system is solved iteratively using the generalized conjugate residual method (GCR) and the precorrected-FFT technique is used to speed up the matrix-vector multiplication. The precorrected-FFT eliminates the need to generate and store the usual square Impedance matrix and thus leads to a significant reduction in memory requirement and computational cost. Numerical results are presented for arbitrarily shaped microstrip antenna arrays to demonstrate the accuracy and efficiency of this technique.
Mon, 01 Sep 2003 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/541252003-09-01T00:00:00Z
- Fast analysis of electromagnetic transmission through arbitrarily shaped airborne radomes using precorrected-fft methodhttps://scholarbank.nus.edu.sg/handle/10635/82345Title: Fast analysis of electromagnetic transmission through arbitrarily shaped airborne radomes using precorrected-fft method
Authors: Nie, X.-C.; Yuan, N.; Li, L.-W.; Yeo, T.-S.; Gan, Y.-B.
Abstract: A fast technique based on the Poggio, Miller, Chang, Harrington and Wu (PMCHW) formulation and the precorrected- FFT method is presented for accurate and efficient analysis of electromagnetic transmission through dielectric radomes of arbitrary shape (including airborne radomes). The method of moments is applied to solve the integral equations in which the surfaces of the radomes are modeled using surface triangular patches and the integral equations are converted into a linear system in terms of the equivalent electric and magnetic surface currents. Next, the precorrected- FFT method, a fast approach associated with O(N1.5 logN) or less complexity, is used to eliminate the requirement of generating and storing the square impedance matrix and to speed up the matrix-vector product in each iteration of the iterative solution. Numerical results are presented to validate the implementation and illustrate the accuracy of the method.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/823452005-01-01T00:00:00Z
- A fast analysis of electromagnetic scattering by arbitrarily shaped homogeneous dielectric objectshttps://scholarbank.nus.edu.sg/handle/10635/54124Title: A fast analysis of electromagnetic scattering by arbitrarily shaped homogeneous dielectric objects
Authors: Nie, X.C.; Li, L.W.; Yuan, N.; Yeo, T.S.; Gan, Y.B.
Abstract: In this paper, we present a fast analysis of electromagnetic scattering by arbitrarily shaped 3D homogeneous dielectric objects. The solution is based on the PMCHW integral equation formulation. The method of moments (MoM) is used to solve the integral equations and the precorrected fast Fourier transform (P-FFT) method is used to eliminate the need to generate and store the square impedance matrix and to speed up the matrix-vector product. Several numerical examples are included, which illustrate the accuracy and capability of the present method.
Sat, 05 Jul 2003 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/541242003-07-05T00:00:00Z
- A fast combined field volume integral equation solution to EM scattering by 3-D dielectric objects of arbitrary permittivity and permeabilityhttps://scholarbank.nus.edu.sg/handle/10635/54129Title: A fast combined field volume integral equation solution to EM scattering by 3-D dielectric objects of arbitrary permittivity and permeability
Authors: Nie, X.-C.; Yuan, N.; Li, L.-W.; Gan, Y.-B.; Yeo, T.S.
Abstract: A fast solution to the combined field volume integral equation (CFVIE) for electromagnetic scattering by large three-dimensional dielectric bodies of arbitrary permittivity and permeability is presented. The CFVIE is formulated in the region of the scatterers by expressing the total fields as the sum of the incident wave and the radiated wave due to both the electric and magnetic polarization currents. The resultant integral equation is solved using the method of moments (MoM). Then the precorrected fast Fourier transform (P-FFT) method is applied to reduce the memory requirement and accelerate the matrix-vector multiplication in the MoM solution. In the implementation of the P-FFT method, two sets of projection operators are constructed respectively for the projections of the electric sources and magnetic sources. In addition, two sets of interpolation operators are also applied respectively for the computation of the vector/scalar potentials and the curl of the vector potentials in the support of the testing functions. The resultant method has a memory requirement O(N) and a computational complexity of O(Nlog N) respectively, where N denotes the number of unknowns. © 2006 IEEE.
Wed, 01 Mar 2006 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/541292006-03-01T00:00:00Z
- Accurate analysis of conformal antenna arrays with finite and curved frequency selective surfaceshttps://scholarbank.nus.edu.sg/handle/10635/54862Title: Accurate analysis of conformal antenna arrays with finite and curved frequency selective surfaces
Authors: Yuan, N.; Nie, X.-C.; Gan, Y.-B.; Yeo, T.-S.; Li, L.-W.
Abstract: In this paper, a full-wave volume-surface integral equation approach is presented for the analysis of conformal microstrip antenna arrays with finite curved frequency selective surface (FSS) radomes. The volume integral equation is applied to the dielectric region of the composite structure, while the surface integral equation is used on the conductive surface. The integral equations are solved using the method of moments (MoM), with the precorrected-FFT (P-FFT) method used to reduce the memory requirement and accelerate the matrix-vector products in the iterative solution of the equation. With this method, FSSs and antennas of arbitrary shape and finite size can be modelled and the effects of the FSS on the characteristics of the antenna can be accurately investigated. © 2007 VSP.
Mon, 01 Oct 2007 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/548622007-10-01T00:00:00Z
- A novel series-fed taper antenna array designhttps://scholarbank.nus.edu.sg/handle/10635/54647Title: A novel series-fed taper antenna array design
Authors: Yuan, T.; Yuan, N.; Li, L.-W.
Abstract: To improve the performance of microstrip antenna array, a matching-in-step (MIS) configuration of microstrip series-fed taper array is designed. Compared to the traditional one, the novel antenna array has a better VSWR characteristic. The design procedure of the MIS antenna array is discussed in detail, and some valuable results are acquired. Numerical results are obtained and a very good agreement is observed between experimental and simulated results of such arrays. © 2008 IEEE.
Tue, 01 Jan 2008 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/546472008-01-01T00:00:00Z
- An efficient hybrid method for analysis of slot arrays enclosed by a large radomehttps://scholarbank.nus.edu.sg/handle/10635/55005Title: An efficient hybrid method for analysis of slot arrays enclosed by a large radome
Authors: Nie, X.-C.; Gan, Y.-B.; Yuan, N.; Wang, C.-F.; Li, L.-W.
Abstract: A hybrid method that combines the integral equation (IE) method and Physical Optics (PO) is proposed for efficient analysis of slot arrays enclosed in an electrically large radome. The integral equations are applied over the aperture of the slot antenna and the tip region of the radome by enforcing continuity of the tangential magnetic or electric field. Equivalent PO currents are assumed on the relatively smooth region of the radome walls, induced by the radiated fields from the antenna. The radiated fields due to the PO currents on the radome are coupled back to the integral equations to account for interactions between the radome and the antenna, as well as the interactions between the tip and other parts of the radome. This method leads to considerable reduction in memory and computational time, since PO is applied to a large part of the electrically large radome, with unknown currents defined only on the aperture of the slot antenna and the small tip region of the radome. Better efficiency can be attained if the integral equation is applied only to the slot aperture and the entire radome wall taken as the PO region, with acceptable degradation in accuracy.
Sun, 01 Jan 2006 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/550052006-01-01T00:00:00Z
- RCS computation of composite conducting-dielectric objects with junctions using the hybrid volume-surface integral equationhttps://scholarbank.nus.edu.sg/handle/10635/51021Title: RCS computation of composite conducting-dielectric objects with junctions using the hybrid volume-surface integral equation
Authors: Yuan, N.; Yeo, T.-S.; Nie, X.-C.; Li, L.-W.
Abstract: The hybrid volume-surface integral equation (VSIE) combined with the Method of Moments (MoM) is applied to the analysis of scattering from arbitrarily composite conducting-dielectric objects with conducting-dielectric or dielectric-dielectric junctions. The electric field volume integral equation is applied to the material region and the electric field surface integral equation is enforced over the conducting surface. Compared to the surface integral equation (SIE), the VSIE is more efficient and convenient since the formulation of the VSIE retains the same simple form regardless of the complexity of the object and materials, and no extra treatment is required when dealing with junction problems.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/510212005-01-01T00:00:00Z
- A fast volume-surface integral equation solver for scattering from composite conducting-dielectric objectshttps://scholarbank.nus.edu.sg/handle/10635/54139Title: A fast volume-surface integral equation solver for scattering from composite conducting-dielectric objects
Authors: Nie, X.-C.; Yuan, N.; Li, L.-W.; Gan, Y.-B.; Yeo, T.S.
Abstract: This paper presents a fast hybrid volume-surface integral equation approach for the computation of electromagnetic scattering from objects comprising both conductors and dielectric materials. The volume electric field integral equation is applied to the material region and the surface electric field integral equation is applied on the conducting surface. The method of moments (MoM) is used to convert the integral equation into a matrix equation and the precorrected-FFT (P-FFT) method is employed to reduce the memory requirement and CPU time for the matrix solution. The present approach is sufficiently versatile in handling problems with either open or closed conductors, and dielectric materials of arbitrary inhomogeneity, due to the combination of the surface and volume electric field integral equations. The application of the precorrected-FFT method facilitates the solving of much larger problems than can be handled by the conventional MoM. © 2005 IEEE.
Tue, 01 Feb 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/541392005-02-01T00:00:00Z
- Fast analysis of scattering by arbitrarily shaped three-dimensional objects using the precorrected-FFT methodhttps://scholarbank.nus.edu.sg/handle/10635/56007Title: Fast analysis of scattering by arbitrarily shaped three-dimensional objects using the precorrected-FFT method
Authors: Nie, X.; Li, L.-W.; Yuan, N.; Yeo, T.S.
Abstract: This Letter presents a fast solution to the electric-field integral equation (EFIE) for large, three-dimensional, arbitrarily shaped objects. The EFIE is discretized by the method of moments and the precorrected-FFT method is then used to accelerate the matrix-vector multiplications in iterations. The resulting algorithm leads to a great reduction in memory requirement and execution time and can be modified to fit a wide variety of systems with different Green's functions without excessive effort.
Fri, 20 Sep 2002 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/560072002-09-20T00:00:00Z
- Efficient analysis and design of finite phased arrays of printed dipoles using fast algorithm: Some case studieshttps://scholarbank.nus.edu.sg/handle/10635/50908Title: Efficient analysis and design of finite phased arrays of printed dipoles using fast algorithm: Some case studies
Authors: Yuan, T.; Li, L.-W.; Leong, M.-S.; Li, J.-Y.; Yuan, N.
Abstract: This paper presents an accurate and efficient method of moments (MoM) analysis for characterizing a large-scaled phased dipole array. In this method, the mixed potential integral equation (MPIE) is utilized and solved iteratively using the generalized conjugate residual method. The precorrected fast Fourier transform (pFFT) method is employed to accelerate the entire computational process so as to reduce significantly both the memory requirement and the computational time for designing large arrays. Numerical results of an example, which had to be solved using approximate approach due to the large number of elements, are presented to demonstrate the efficiency and accuracy of the present method. © 2007 VSP.
Sun, 01 Apr 2007 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/509082007-04-01T00:00:00Z
- Efficient analysis of electromagnetic scattering and radiation from patches on finite, arbitrarily curved, grounded substrateshttps://scholarbank.nus.edu.sg/handle/10635/82241Title: Efficient analysis of electromagnetic scattering and radiation from patches on finite, arbitrarily curved, grounded substrates
Authors: Yuan, N.; Yeo, T.S.; Nie, X.C.; Li, L.W.; Gan, Y.B.
Abstract: A precorrected-fast Fourier transform (FFT) accelerated surface integral equation approach formulated using the homogeneous medium Green's function is presented for the analysis of patch arrays on finite, arbitrarily shaped, grounded substrate. The integral equation is solved by the method of moments, and the precorrected-FFT method is applied to reduce the memory requirement and computational complexity of the solution procedure. The memory required for this algorithm is O(N1.5), and the computational complexity is N iterW1.5log N, where N is the number of unknowns and Niter is the iteration number. Numerical results are presented to demonstrate the accuracy and capability of the method.
Sat, 01 May 2004 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/822412004-05-01T00:00:00Z
- Precorrected-FFT solution of the volume integral equation for 3-D inhomogeneous dielectric objectshttps://scholarbank.nus.edu.sg/handle/10635/57109Title: Precorrected-FFT solution of the volume integral equation for 3-D inhomogeneous dielectric objects
Authors: Nie, X.-C.; Li, L.-W.; Yuan, N.; Yeo, T.S.; Gan, Y.-B.
Abstract: This paper presents a fast solution to the volume integral equation for electromagnetic scattering from three-dimensional inhomogeneous dielectric bodies by using the precorrected-fast Fourier transform (FFT) method. The object is modeled using tetrahedral volume elements and the basis functions proposed by Schaubert et al. are employed to expand the unknown electric flux density. The basis functions are then projected onto a fictitious uniform grid surrounding the nouniform mesh, enabling the FFT to be used to speed up the matrix-vector multiplies in the iterative solution of the matrix equation. The resultant method greatly reduces the memory requirement to O(N) and the computational complexity to O(N log N), where N is the number of unknowns. As a result, this method is capable of computing electromagnetic scattering from large complex dielectric objects. © 2005 IEEE.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/571092005-01-01T00:00:00Z
- Efficient analysis of probe-fed microstrip antennas on arbitrarily shaped, finite ground plane and substratehttps://scholarbank.nus.edu.sg/handle/10635/70101Title: Efficient analysis of probe-fed microstrip antennas on arbitrarily shaped, finite ground plane and substrate
Authors: Yuan, N.; Yeo, T.S.; Nie, X.C.; Gan, Y.B.; Li, L.W.
Abstract: An efficient method based on the Volume-Surface-Wire integral equation and precorrected-FFT method is presented for the accurate analysis of probe-fed microstrip antennas on arbitrarily shaped, finite sized ground plane and substrate. The method of moments (MoM) is used to solve the integral equation in which three triangular-type basis functions are used to represent the unknown currents on the substrates, surfaces, and wires. The probe feed is rigorously modeled using an attachment mode at the junction. The precorrected-FFT is applied to reduce the memory requirement and computational cost of the MoM to facilitate analysis of large arrays. © 2005 IEEE.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/701012005-01-01T00:00:00Z
- Efficient numerical modeling of large-scale microstrip structureshttps://scholarbank.nus.edu.sg/handle/10635/70110Title: Efficient numerical modeling of large-scale microstrip structures
Authors: Yuan, N.; Yeo, T.S.; Nie, X.C.; Li, L.W.
Abstract: The precorrected-FFT method is employed to eliminate the need to store the impedance matrix and accelerate the matrix-vector product. In the approach, the mixed potential integral equation (MPIE) is developed in the spatial domain and discretized using triangular elements with RWG basis functions. The resulting algorithm reduces the memory requirement and computational cost to O(N) and O(N log N) respectively. Thus, numerical examples are presented to demonstrate the efficiency and accuracy of the method.
Tue, 01 Jan 2002 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/701102002-01-01T00:00:00Z
- Fast frequency-sweep analysis of RCS using pre-corrected FFT and asymptotic waveform evaluation techniquehttps://scholarbank.nus.edu.sg/handle/10635/70303Title: Fast frequency-sweep analysis of RCS using pre-corrected FFT and asymptotic waveform evaluation technique
Authors: Nie, X.; Yuan, N.; Gan, Y.B.; Li, L.W.
Mon, 01 Jan 2007 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/703032007-01-01T00:00:00Z
- An efficient hybrid method for analysis of radome-enclosed slot antenna arrayshttps://scholarbank.nus.edu.sg/handle/10635/69302Title: An efficient hybrid method for analysis of radome-enclosed slot antenna arrays
Authors: Nie, X.C.; Gan, Y.B.; Yuan, N.; Wang, C.-F.; Li, L.W.
Abstract: A hybrid method that combines the integral equation (IE) method and Physical Optics (PO) is presented for efficient analysis of slot antenna arrays enclosed in an electrically large radome. The integral equation is over the aperture of the slot antenna via continuity of the tangential magnetic fields. Equivalent PO currents are assumed on the radome walls, induced by the fields radiated from the antenna. The reflected fields due to the PO currents on the radome are coupled back to the integral equation to take into account the interactions between the radome and the antenna. This method leads to considerable reduction in memory and computational time, since PO is applied to the electrically large radome, with unknown currents defined only on the aperture of the slot antenna. © 2005 IEEE.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/693022005-01-01T00:00:00Z
- Analysis of antenna arrays with finite frequency selective surfaceshttps://scholarbank.nus.edu.sg/handle/10635/69390Title: Analysis of antenna arrays with finite frequency selective surfaces
Authors: Ning, Y.; Xiao, C.N.; Yeow, B.G.; Tat, S.Y.
Abstract: In this paper, a full-wave method based on the volume-surface integral equation is applied to analyze microstrip antenna arrays with finite FSS radome. The volume integral equation is applied to the dielectric region of the composite structure, while the surface integral equation is used on the conductive surface. The integral equations are solved using the method of moments (MoM), with the precorrected-FFT (P-FFT) method used to reduce the memory requirement and accelerate the matrix-vector products in the iterative solution of the equation. With this method, the effects of the FSS on the characteristics of the antenna can be accurately investigated.
Sun, 01 Oct 2006 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/693902006-10-01T00:00:00Z
- Analysis of finite phased arrays of printed dipoles using P-FFT algorithmhttps://scholarbank.nus.edu.sg/handle/10635/51116Title: Analysis of finite phased arrays of printed dipoles using P-FFT algorithm
Authors: Yuan, T.; Li, J.-Y.; Li, L.-W.; Yuan, N.; Leong, M.-S.
Abstract: This paper presents an accurate and efficient method of moments (MoM) for analyzing the characteristic of a large-scale phased dipole array. The precorrected fast Fourier transform (P-FFT) method is employed to accelerate the entire computational process to reduce significantly both die memory requirement and computational time for large arrays. Numerical results are presented to demonstrate the efficiency and accuracy of the present method. ©2005 IEEE.
Sat, 01 Jan 2005 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/511162005-01-01T00:00:00Z
- A high performance phased antenna array design and analysis using fast algorithmhttps://scholarbank.nus.edu.sg/handle/10635/51079Title: A high performance phased antenna array design and analysis using fast algorithm
Authors: Yuan, T.; Li, L.-W.; Li, J.-Y.; Yuan, N.; Leong, M.-S.
Sun, 01 Jan 2006 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/510792006-01-01T00:00:00Z
- A precorrected-FFT approach for capacitance extraction of general three-dimensional structureshttps://scholarbank.nus.edu.sg/handle/10635/51092Title: A precorrected-FFT approach for capacitance extraction of general three-dimensional structures
Authors: Nie, X.; Li, L.; Yuan, N.
Abstract: A precorrected fast Fourier transforms (FFT) method was used for capacitance extraction of general three-dimensional structures. The linear system arising from the discretization was solved by a generalized conjugate residual iterative technique. This technique required O(N) memory storage and O(N log N) operations to perform a potential calculation.
Mon, 01 Jan 2001 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/510922001-01-01T00:00:00Z
- Precorrected-FFT solution of the volume integral equations for inhomogeneous dielectric bodieshttps://scholarbank.nus.edu.sg/handle/10635/71492Title: Precorrected-FFT solution of the volume integral equations for inhomogeneous dielectric bodies
Authors: Nie, X.C.; Li, L.W.; Yuan, N.; Yeo, T.S.; Gan, Y.B.
Abstract: The precorrected-FFT method is applied to the fast solution of the volume integral equation for lossy, inhomogeneous dielectric bodies. The volume of the dielectric body is discretized into tetrahedron elements and the SWG basis functions are employed to expand the unknown electric flux density. The basis functions are then projected onto a uniform grid surrounding the nouniform mesh, enabling the FFTs to be used to speed up the matrix-vector multiplies in the iterative solution of the matrix equation. The resultant method has a computational complexity and memory requirement of O(N log N) and O(N) respectively.
Wed, 01 Jan 2003 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/714922003-01-01T00:00:00Z
- The application of the generalized conjugate residual algorithm to accelerate the fast multipole methodhttps://scholarbank.nus.edu.sg/handle/10635/51254Title: The application of the generalized conjugate residual algorithm to accelerate the fast multipole method
Authors: Yuan, N.; Tat Soon Yeo; Li, L.; Nie, X.
Abstract: A generalized conjugate residual algorithm (GCR) was employed as the iterative method to accelerate the fast multipole method (FMM) for the study of interactions between groups of scatterers. The average iteration number was found to be about 82 when using zero initial guess and 53 when using the phase-corrected solution of the previous angle as the initial guess for the next angle. It was demonstrated that the technique reduced the iteration number significantly.
Mon, 01 Jan 2001 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/512542001-01-01T00:00:00Z
- Design and analysis of phased antenna array with low sidelobe by fast algorithmhttps://scholarbank.nus.edu.sg/handle/10635/55535Title: Design and analysis of phased antenna array with low sidelobe by fast algorithm
Authors: Yuan, T.; Yuan, N.; Li, L.-W.; Leong, M.-S.
Abstract: In this paper, a high performance phased antenna array is designed. Compared with the traditional ones, this antenna array has a lower sidelobe characteristic of down to -16 dB. At different scanning angles, the comparison between calculated and measured results of S-parameters and E- and H-plane antenna patterns is made and a very good agreement is found. Moreover, the precorrected fast Fourier transform method is employed to accelerate the entire computational process to reduce significantly both the memory requirement and computational time, but to increase the design accuracy and optimization efficiency.
Tue, 01 Jan 2008 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/555352008-01-01T00:00:00Z
- Precorrected-FFT algorithm for solving combined field integral equations in electromagnetic scatteringhttps://scholarbank.nus.edu.sg/handle/10635/82923Title: Precorrected-FFT algorithm for solving combined field integral equations in electromagnetic scattering
Authors: Nie, X.-C.; Li, L.-W.; Yuan, N.
Abstract: The precorrected-FFT method is applied in this paper to solve the combined field integral equation (CFIE) for scattering by arbitrarily shaped three-dimensional conductors. The object is first discretized using triangular elements with the Rao-Wilton-Glisson (RWG) basis functions. The source singularities on the original triangular meshes are then projected onto uniform rectangular grids, which enables the calculation of the resultant matrix-vector product to be performed by using the fast Fourier transforms. The memory requirement and computational complexity of the resulting algorithm are of O(N1.5) and O(N1.5 log N), respectively, where N denotes the number of unknowns. In addition, the employment of CFIE eliminates the interior resonance problem suffered by both the electric field integral equation (EFIE) and the magnetic field integral equation (MFIE) and thus significantly improves the convergence of the iterative solution. A unique advantage of the present method is that the computational expense per iteration of CFIE is almost the same as that of EFIE. This fast algorithm renders problems associated with electromagnetic scattering by large complex objects be handled on a normal personal computer.
Tue, 01 Jan 2002 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/829232002-01-01T00:00:00Z