• Title/Summary/Keyword: MoM(Method of Moment)

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MoM Forward Solver for Medical Microwave Imaging (의용 전자파 영상을 위한 모멘트법 순방향 해석 알고리즘)

  • Kim, Bo-Ra;Lee, Taek-Kyung;Son, Seong-Ho;Jeon, Soon-Ik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.8
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    • pp.797-805
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    • 2009
  • In this paper, we developed MoM(Moment of Method) forward solver to implement the inverse scattering by using BIM(Born Iterative Method) for the detection of cancer in human body Especially, we adopted two-dimensional breast structure to analyze electromagnetic scattered phenomena. For the two-dimensional scattering structure, the integral equations is solved with MoM employing two-dimensional Green's function. Also, calculated results are compared with the measured results obtained from breast cancer detecting equipment.

Paratic Impedance Extraction of FC-PGA Package Pin using the Static Fast Multipole Method (Static FMM을 이용한 FC-PGA 패키지 핀에서의 기생 임피던스 추출)

  • 천정남;이정태;어수지;김형동
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.7
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    • pp.1076-1085
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    • 2001
  • In this paper, the FMM(Fast Multipole Method) combined with GMRES(Generalized Minimal RESidual Method) matrix solver is used to extract the parasitic impedance for complicated 3-D structures in uniform dielectric materials which limit the use of MoM(Method of Moment) due to its large computation time and memory requirement. This algorithm is a fast multipole-accelerated method based on quasistatic analysis and is very efficient for computing impedance between conductors. This paper proved the accuracy and efficiency of the FMM by comparing with MoM in simple examples. Finally the parasitic impedance of FC-PGA(Flip Chip Pin Grid Array) Package pins has been extracted by this algorithm and we have considered the possibility of the EMI/EMC problem caused by the signal interference.

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MOM-Based Born Iterative Method for Medical Microwave Imaging (의용 전자파 영상을 위한 MoM 기반 Born 반복법의 적용)

  • Son, Jae-Gi;Kim, Bo-Ra;Lee, Taek-Kyung;Son, Seong-Ho;Jeon, Soon-Ik;Lee, Jae-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.4
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    • pp.524-532
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    • 2012
  • In this paper, we used MOM-based BIM(Born Iterative Method) algorithm to implement the inverse scattering for the detection of cancer. We adopted two-dimensional breast structure, integral equations and two-dimensional Green's function is solved with MoM(Method of Moment) to analyzing electromagnetic scattering phenomena. In addition, verifying the calculation of developed inverse scattering algorithm and analyzing medical applicability and limitations of the algorithm.

Precise Numerical Simulation of Microwave Scattering from Natural Deciduous Leaves Using the Method of Moment

  • Oh Yisok;Hong Jin-Young
    • Proceedings of the KSRS Conference
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    • 2004.10a
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    • pp.586-589
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    • 2004
  • A numerical algorithm using the Method of Moments (MoM) is introduced to compute precisely the scattering matrices of very thin deciduous leaves in this paper. At first, a dyadic Green's function was formulated and an integral equation for a volumetric current distribution in a lossy dielectric body. Then, the MoM was applied to the scattering problem with a specific technique to handle the numerical poles. The accuracy of the numerical technique was verified by examining the technique with various ways, and used to examine the validity regions of the classical analytical models.

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Scattering analysis of curved FSS using Floquet harmonics and asymptotic waveform evaluation technique

  • Jeong, Yi-Ru;Hong, Ic-Pyo;Chun, Heoung-Jae;Park, Yong Bae;Kim, Youn-Jae;Yook, Jong-Gwan
    • Steel and Composite Structures
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    • v.17 no.5
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    • pp.561-572
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    • 2014
  • In this paper, we present the scattering characteristics of infinite and finite array using method of moment (MoM) with Floquet harmonics and asymptotic waveform evaluation (AWE) technique. First, infinite cylindrical dipole array is analyzed using the MoM with entire domain basis function and cylindrical Floquet harmonics. To provide the validity of results, we fabricated the cylindrical dipole array and measured the transmission characteristics. The results show good agreements. Second, we analyzed the scattering characteristics of finite array. A large simulation time is needed to obtain the scattering characteristics of finite array over wide frequency range because Floquet harmonics can't be applied. So, we used the MoM with AWE technique using Taylor series and Pade approximation to overcome the shortcomings of conventional MoM. We calculated the radar cross section (RCS) as scattering characteristics using the proposed method in this paper and the conventional MoM for finite planar slot array, finite spherical slot array, and finite cylindrical dipole array, respectively. The compared results agree well and show that the proposed method in this paper is good for electromagnetic analysis of finite FSS.

Design of a Rectangular Loop Array Antenna for Beam Scanning (빔 조향이 가능한 직사각형 루프 배열 안테나의 설계)

  • Koo, Han-Ni;Han, In-Hee;Kim, Dong-Seok;Kim, Chan-Hong;Park, Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.8
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    • pp.922-929
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    • 2007
  • In this paper, a rectangular loop array antenna for beam scanning is designed. A program using RWG MoM(Rao Wilton Glisson Method of Moment) is developed for SEP(Scan Element Pattern) theoretically. Simulation results obtained by using a commercial software tool, MWS are compared with the MoM results to confirm the validity of the program. Also these results are compared with the measured ones for the case of an $8{\times}5$ subarray. The fabricated $8{\times}5$ subarray showed a flat gain characteristic in the elevation scan range of ${\pm}45^{\circ}$ in the E-plane.

A Study on Electromagnetic Scattering Analysis of Penetrable Objects Using Block Matrix Preconditioner(BMP) and IE-FFT (Block Matrix Preconditioner와 IE-FFT를 이용한 침투 가능한 구조물의 전자기 산란해석에 관한 연구)

  • Kang, Ju-Hwan
    • Journal of IKEEE
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    • v.23 no.2
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    • pp.614-621
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    • 2019
  • In this paper, we presents the integral equation-fast Fourier transform(IE-FFT) and block matrix preconditioner (BMP) to solve electromagnetic scattering problems of penetrable structures composed of dielectric or magnetic materials. IE-FFT can significantly improve the amount of calculation to solve the matrix equation constructed from the moment method(MoM). Moreover, the iterative method in conjunction with BMP can be significantly reduce the number of iterations required to solve the matrix equations which are constructed from electrically large structures. Numerical results show that IE-FFT and block matrix preconditioner can solve electromagnetic scattering problems for penetrable objects quickly and accurately.

A Study on DOA Estimation Using Dipole Array Antenna Based on MoM (MoM 기법에 의한 다이폴 배열 안테나의 신호 방향 추정 방법 연구)

  • Moon, Sang-Kon;Lee, Kang-In;Yang, Hoon-Gee;Bae, Kyung-Bin;Chung, Young-Seek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.7
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    • pp.661-668
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    • 2011
  • Direction estimation of signal of interest has been an important issue in radar and communication system. Generally, DOA(Direction Of Arrival) methods have been researched in the field of signal processing with ideal array sensors. However, there are some problems in array antennas such as the input signal distortions in amplitude and phase, due to the mutual coupling between array elements. In this paper, we propose a new method of DOA estimation in the dipole array antenna by using the method of moment(MoM) to compensate the mutual coupling effects between array antenna elements. Also, the proposed method is applied to the estimation of azimuth(${\phi}$ ) and elevation(${\theta}$) angles using uniformly linear dipole array under noisy environments.

Analysis of Electromagnetic Interference of a Parallel Plate with Apertures using the SDDI Technique (SDDI 기법을 이용하는 개구를 가지는 평행평판 구조의 전자파 간섭 해석)

  • 강승택;최재훈
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.1
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    • pp.63-67
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    • 2000
  • In this paper, the electromagnetic interference of a parallel plate with apertures is characterized by the method of moment(MoM), using the Spline-type Divided-Difference Interpolation(SDDI) technique. Particularly, for the solution of the problem, the application of the SDDI technique is extended to the calculation of the summation-type Green's functions. It improves numerical efficiency, having accuracy and saving the overall computational time required in the MoM application. For validating the proposed method, the electric fields on the apertures are calculated and compared to those of the literature. The numerical results show good agreement with them.

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