■Faculty | Department of Computational Systems Biology / Graduate School of Biology-Oriented Science and Technology |

■Position | Professor |

■Degree | |

■Commentator Guide | https://www.kindai.ac.jp/meikan/276-asai-masamitsu.html |

■URL | |

Last Updated :2020/09/03

- 1978 04 - 1981 03 , Aiko High School
- 1982 04 - 1987 03 , Osaka Prefecture University, College of Engineering
- 1987 04 - 1989 03 , Osaka Prefecture University, Graduate School of Engineering
- 1989 04 - 1992 03 , Osaka Prefecture University, Graduate School of Engineering

- 2008 , - 現在, Professor, Faculty of Biology-Oriented Science and Technology, Kindai University
- 2008 , - 現在, Outside Lecturer, Kyoto University
- 2015 , - 2018 , Director, Library of Faculty of Biology-Oriented Science and Technology, Kindai University
- 2011 , - 2018 , Executive Director, Radiation Science Society of Japan
- 1997 , - 1998 , Visiting Faculty, University of Utah
- 1993 , - 1996 , Research Associate, Faculty of Biology-Oriented Science and Technology, Department of Electronic Systems and Information Engineering, Kindai University
- 1992 , - 1993 , Research Associate, Faculty of Science and Engineering, Kindai University

- Natural sciences, Mathematical physics and basic theory, Electromagnetics
- Nanotechnology/Materials, Applied physics - general

- chiral medium, space solar power systems, inverse dam, quasi-isotropic particles, diffraction gratings, metamaterials, matrix-eigenvalue method, Structural colouring, Shadow theory, metamaterial, chiral, grating, diffraction, scattering, Electromagnetic wave

- Structural coloration by slanted subwavelength gratings in conical mounting, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, Nov. 2019 , Refereed
- Cubic arrangement of helices as a particle for a quasi-Isotropic chiral medium, Masamitsu Asai, Hideaki Wakabayashi, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, Nov. 2019 , Refereed
- On the accuracy of the MoM analysis for the scattering factors of metallic strip gratings with dielectric slabs in terms of the reciprocity theorem, Masamitsu Asai, Hideaki Wakabayashi, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, OS2(21), Oct. 2017 , Refereed
- Reciprocity Error of Numerical Solutions in Dielectric Gratings, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, OS2(20), Oct. 2017 , Refereed
- Numerical Analysis for Structural Coloration of Multilayered Gratings of Non-ideal Type, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, 1, Oct. 2016 , Refereed
- Numerical study on small quasi-isotropic particles for chiral media with fine granularity, Masamitsu Asai, Hideaki Wakabayashi, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, 1, Oct. 2015 , Refereed
- Three dimensional analysis of structural coloration in subwavelength gratings, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, 1, Oct. 2015 , Refereed
- Periodic array of thin-wire chiral objects with cancellation of quadrupole moments, Masamitsu Asai, Hideaki Wakabayashi, Keiji Matsumoto, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, 1, Oct. 2014 , Refereed
- Application of shadow theory to middle regions of multilayered dielectric gratings placed in conical mounting, Hideaki Wakabayashi, Masamitsu Asai, Keiji Matsumoto, Jiro Yamakita, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, 1, Oct. 2014 , Refereed
- Constitutive characteristics of distributions of conducting helices with helically-bent axes, M. Asai, H. Wakabayashi, J. Yamakita, K. Matsumoto, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, OS13(1), 55 - 56, Sep. 2013 , Refereed
- Analysis of wave scattering by dielectric gratings for low grazing of circularly-polarized incidence, H. Wakabayashi, M. Asai, J. Yamakita, K. Matsumoto, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, OS13(1), 13 - 14, Sep. 2013 , Refereed
- Helical Structures as Electromagnetic Wave Media, M. Asai, H. Wakabayashi, J. Yamakita, K. Matsumoto, Materials Integrations, Materials Integrations, 25(12), 31 - 37, Dec. 2012 , Refereed
- Effective constitutive characteristics of racemic mixture of thin-wire helices, 浅居 正充, 若林秀昭, 山, 松本恵治, Proceedings of International Conference on Simulation Technology, Proceedings of International Conference on Simulation Technology, OS1, 8-1 - 8-4, Sep. 2012 , Refereed
- Analysis of wave scattering by composite dielectric gratings with conducting strips using scattering factors, H. Wakabayasi, M. Asai, K. Matsumoto, J. Yamakita, Proceedings of International Conference on Modeling and Simulation Technology, Proceedings of International Conference on Modeling and Simulation Technology, OS5, 187 - 192, Oct. 2011 , Refereed
- Contributions of the Quadrupole Moments in the Effective Constitutive Characteristics for the Anisotropic Distributions of Metallic Thin-Wire Helices, M. Asai, H. Wakabayashi, K. Matsumoto, J. Yamakita, Proceedings of International Conference on Modeling and Simulation Technology, Proceedings of International Conference on Modeling and Simulation Technology, OS5, 179 - 182, Oct. 2011 , Refereed
- Constitutive characteristics of periodic structures composed of coupled metallic helices, M. Asai, J. Yamakita, Proceedings of Asia-Pacific Radio Wave Conference, Proceedings of Asia-Pacific Radio Wave Conference, B4, B4-1 - B4-1, Sep. 2010 , Refereed
- to be written, M. Asai, J. Yamakita, H. Wakabayashi, K. Matsumoto, IEICE Transactions C-1, IEICE Transactions C-1, J93-C(3), 81 - 90, Apr. 2010 , Refereed
- Effective constitutive parameters of periodic structures composed of thin-wire helices, M. Asai, J. Yamakita, Proceedings of the International Laser, Light and Microwave Conference, Proceedings of the International Laser, Light and Microwave Conference, T2, 24-TP2-4-1 - 24-TP2-4-4, Apr. 2008 , Refereed
- Effective Medium Parameters for Distributions of Clustering Helices with Structural Deviations, M. Asai, J. Yamakita, Proceedings. of the International Symposium on Antennas and Propagations, Proceedings. of the International Symposium on Antennas and Propagations, 1, 564 - 567, Aug. 2007 , Refereed
- Quasi-static analysis of effective medium parameters for distributions of clustering helices, M. Asai, Memoirs of the School of Biology-Oriented Science and Technology, Kinki University, Memoirs of the School of Biology-Oriented Science and Technology, Kinki University, (20), 9 - 12, 2007 , Refereed
- Numerical Study on Waves from Particles Composed of Bunches of Helices, M. Asai, J. Yamakita, Proceedengs of the Progress of Electromagnetics Research Symposium, Proceedengs of the Progress of Electromagnetics Research Symposium, 1, 490 - 490, Aug. 2006 , Refereed
- Study on EM waves scattered by chiral or racemic mixture of conducting helices based on thin-wire MoM, M. Asai, Memoirs of School of Biology-Oriented Science and Technology of Kinki University, Memoirs of School of Biology-Oriented Science and Technology of Kinki University, No. 16, pp. 29-36, 2005 , Refereed
- to be written, M. Asai, J. Yamakita, K. Matsumoto, H. Wakabayashi, Materials Integration, Materials Integration, 17(7), 27 - 33, Jul. 2004 , Refereed
- Periodic Green's functions for a planar-stratified bianisotropic chiral medium, M. Asai, Memoirs of School of Biology-Oriented Sci.& Tech., Kinki Univ., Memoirs of School of Biology-Oriented Sci.& Tech., Kinki Univ., No. 14(14), 41 - 48, 2004 , Refereed
- Improved convergence in the analysis of thin metallic gratings with thickness profiles, H. Wakabayasi, M. Komatsu, J. Yamakita, M. Asai, Radio Science, Radio Science, 38(6), 8-1 - 8-10, Aug. 2003 , Refereed
- to be written, M. Asai, J. Yamakita, H. Wakabayashi, Transaction of IEE Japan A, Transaction of IEE Japan A, 123(3), 239 - 245, Mar. 2003 , Refereed
- Diffraction from an anisotropic chiral slab with a periodically-apertured plane, M. Asai, J. Yamakita, H. Wakabayashi, Proceedings of the Interim International Symposium on Antennas and Propagation, Proceedings of the Interim International Symposium on Antennas and Propagation, 1, 21 - 24, Nov. 2002 , Refereed
- Diffraction by a periodically-apertured sheet on a uniaxial chiral slab, M. Asai, J. Yamakita, H. Wakabayashi, Proceedings of the Asia-Pacific Microwave Conference, Proceedings of the Asia-Pacific Microwave Conference, 3, 1533 - 1536, Nov. 2002 , Refereed
- Analysis of electromagnetic waves interacting with a planar-stratified bianisotropic medium with a strip grating, M. Asai, J. Yamakita, Electromagnetic wave and electronic systems, Electromagnetic wave and electronic systems, 7(4), 106 - 111, Apr. 2002 , Refereed
- Analysis of electromagnetic waves interacting with planar-stratified bianisotropic media, M. Asai, J. Yamakita, Telecommunications and Radio Engineering, Telecommunications and Radio Engineering, 58(1), 154 - 163, Jan. 2002 , Refereed
- Use of multilayered step method in analysis of lossless and lossy dielectric gratings, Hideaki Wakabayashi, Jiro Yamakita, Keiji Matsumoto, Masamitsu Asai, Proceedings of the International Laser, Lightwave and Microwave Conference, Proceedings of the International Laser, Lightwave and Microwave Conference, 1, 89 - 91, Nov. 2001 , Refereed
- Electromagnetic Wave Interaction with a Planar-Stratified Bianisotropic Medium with a Strip Grating, M. Asai, J. Yamakita, Proceedings of 2001 FESS-MMNA(Russia), Proceedings of 2001 FESS-MMNA(Russia), 1, 12 - 17, Aug. 2001 , Refereed
- Verification of Resistive Boundary of Scattering by a Plane Grating on Multilayered Substrates, Hideaki Wakabayashi, Jiro Yamakita, Masamitsu Asai, Keiji Matsumoto, Proceedings of the Progress in Electromagnetics Research Symposium, Proceedings of the Progress in Electromagnetics Research Symposium, 1, 8 - 8, Jul. 2001 , Refereed
- Efficient Computation of Dielectric Gratings in Conical Diffraction, M. Komatsu, J. Yamakita, K. Matsumoto, M. Asai, Proceedings of 2001 Progress in Electromagnetics Research Symposium, Proceedings of 2001 Progress in Electromagnetics Research Symposium, 1, 7 - 7, Jul. 2001 , Refereed
- Plane Wave Scattering from a Thin Metallic Grating in a Planar-Stratified Uniaxial Chiral Medium, M. Asai, J. Yamakita, H. Wakabayashi, J. Ishii, Proceedings of 2001 Progress in Electromagnetics Research Symposium, Proceedings of 2001 Progress in Electromagnetics Research Symposium, 1, 386 - 386, Jul. 2001 , Refereed
- Plane Wave Diffraction from a Periodic Array of Conducting Patches between Two Uniaxial Chiral Slabs, M. Asai, J. Yamakita, H. Wakabayashi, J. Ishii, Proceedings of 2001 Progress in Electromagnetics Research Symposium, Proceedings of 2001 Progress in Electromagnetics Research Symposium, 1(1), 13 - 13, Jul. 2001 , Refereed
- Efficient improved Fourier-expansion methods for dielectric lamellar gratings in conical diffraction, M. Komatsu, J. Yamakita, K. Matsumoto, M. Asai, Proceedings of Japan-China Joint Conf. on Optical fiber science & Electromagnetic Theory, Proceedings of Japan-China Joint Conf. on Optical fiber science & Electromagnetic Theory, 1, 87 - 90, Dec. 2000 , Refereed
- Analysis of diffracted waves from a uniaxial chiral layer with a thin metallic grating, M. Asai, J. Yamakita, H. Wakabayashi, J. Ishii, Proceedings of Japan-China Joint Conf. on Optical fiber Science & Electromagnetic Theory, Proceedings of Japan-China Joint Conf. on Optical fiber Science & Electromagnetic Theory, 1, 243 - 246, Dec. 2000 , Refereed
- Analysis of electromagnetic waves scattered by a uniaxial chiral slab with a thin strip grating, M. Asai, J. Yamakita, H. Wakabayashi, J. Ishii, Proceedings of the JSST International Conference on Modeling Cont. and Com. in Simulation, Proceedings of the JSST International Conference on Modeling Cont. and Com. in Simulation, 1, 333 - 336, Oct. 2000 , Refereed
- Analysis of electromagnetic waves diffracted by a grounded uniaxial chiral slab with an infinite array of strips, M. Asai, J. Yamakita, H. Wakabayashi, J. Ishii, Proceedings of International Symposium on Antennas & Propagation, Proceedings of International Symposium on Antennas & Propagation, 1, 113 - 116, Aug. 2000 , Refereed
- Analysis of infinitely thin dielectric gratings with surface relief, Hideaki Wakabayashi, Jiro Yamakita, Keiji Matsumoto, Masamitsu Asai, IEICE Transactions C-I, IEICE Transactions C-I, J82-C-1(4), 175 - 183, Apr. 1999 , Refereed
- Analysis of an infinite metallic grating with thickness, Hideaki Wakabayashi, Jiro Yamakita, Keiji Matsumoto, Masamitsu Asai, Proceedings of the Progress in Electromagnetics research symposium, Proceedings of the Progress in Electromagnetics research symposium, 2, 649 - 649, Mar. 1999 , Refereed
- Analysis of electromagnetic waves scattered by strip gratings with isotropic chiral media, Masamitsu Asai, Jiro Yamakita, Shinnosuke Sawa, Junya. Ishii, Memoirs of School of Biology-Oriented Science and Technology of Kinki University, Memoirs of School of Biology-Oriented Science and Technology of Kinki University, 2(2), 24 - 36, Oct. 1997 , Refereed
- to be written, Hideaki Wakabayashi, Jiro Yamakita, Keiji Matsumoto, Masamitsu Asai, IEICE Transactions C-1, IEICE Transactions C-1, J-80-C-1(9), 387 - 396, Sep. 1997 , Refereed
- Electromagnetic field simulation of cable in metallic duct, J. Ishii, K. Aoki, S. Hontsu, M. Asai, Proceedings of the 5th European Simulation Congress, Proceedings of the 5th European Simulation Congress, (3), 17 - 17, Sep. 1995 , Refereed
- Scattering by two-dimensional resistive plane gratings with polar-type anisotropic medium, Masamitsu Asai, Jiro Yamakita, S. Shinnosuke, J. Ishii, Proceedings of the 5th China-Japan Joint Conference on Optical Fiber Science and Electromagnetic Theory, Proceedings of the 5th China-Japan Joint Conference on Optical Fiber Science and Electromagnetic Theory, EMT95(A13), A77 - A82, Sep. 1995 , Refereed
- Electromagnetic wave scattering by a two-dimensional plane grating with anisotropic slab, Electromagnetic wave, scattering by a, wo-dimensional, plane grating with, anisotropic slab, Proceedings of the IASTED International Conference, Proceedings of the IASTED International Conference, C-212, 249 - 252, Sep. 1994 , Refereed
- to be written, Masamitsu Asai, Jiro Yamakita, S. Shinnosuke, IEICE Transactions C-1, IEICE Transactions C-1, J75-C-I(11), 694 - 702, Nov. 1992 , Refereed
- to be written, Masamitsu Asai, Hikaru Ozaki, Jiro Yamakita, S. Shinnosuke, IEICE Transactions C-1, IEICE Transactions C-1, J75-C-I(2), 74 - 84, Feb. 1992 , Refereed
- Scattering from strip gratings with surface resistance: In the case of general anisotropic substrates, Masamitsu Asai, Akira Ozaki, Jiro Yamakita, Shinnosuke Sawa, Electronics and Communications in Japan (Part II: Electronics), Electronics and Communications in Japan (Part II: Electronics), 75(7), 19 - 31, 1992 , RefereedSummary:This paper analyzes the problem of scattering of a plane electromagnetic wave by a resistive strip grating placed on a multilayered anisotropic substrate. As the method for analysis, the procedures by Teitler and Berreman which can handle the electromagnetic fields in anisotropic medium are extended to which the space harmonic expansion is applied. The currents on the resistive strips are determined by applying Galerkin's method to the resistive boundary condition on the plane with a strip grating. Numerical examples are presented for the reflection coefficients and diffraction efficiencies. First, the results are given in comparison with the data from other publications in the case where the grating is in air or on a grounded dielectric substrate. Afterward, the examples with anisotropic media are presented. Copyright © 1992 Wiley Periodicals, Inc., A Wiley Company
- On the resistive boundary conditions for planar dielectric structures, Masamitsu Asai, Jiro Yamakita, S. Shinnosuke, Bulletin of Osaka Prefecture University Series A, Bulletin of Osaka Prefecture University Series A, 40(1), 19 - 30, Oct. 1991 , Refereed
- to be written, Masamitsu Asai e, IEICE Transactions C-1, IEICE Transactions C-1, J73-C-I(9), 594 - 596, Sep. 1990 , Refereed
- to be written, Masamitsu Asai e, IEICE Transactions C-1, IEICE Transactions C-1, J71-B(11), 1376 - 1377, 1988 , Refereed
- Three-dimensional Analysis of Structural Coloration bya Slanted Dielectric Grating, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, Journal of the Optical Society of America A, Journal of the Optical Society of America A, Aug. 07 2020 , Refereed
- Reciprocity theorem and accuracy evaluation on scattering fields by dielectric gratings, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, Journal of the Optical Society of America A, Journal of the Optical Society of America A, 35(11), 1861 - 1861, Nov. 01 2018 , Refereed
- Numerical Evaluation by Reciprocity in Dielectric Gratings, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, 2017 IEEE INTERNATIONAL CONFERENCE ON COMPUTATIONAL ELECTROMAGNETICS (ICCEM), 2017 IEEE INTERNATIONAL CONFERENCE ON COMPUTATIONAL ELECTROMAGNETICS (ICCEM), 3C1.3, 300 - 302, 2017 , RefereedSummary:In the theory of gratings, a numerical diffraction solution must be satisfy the energy balance and the reciprocity. The matrix eigenvalues method has been presented to study the diffraction by dielectric gratings. In the method, the error of energy balance always becomes zero except for rounding error. An accuracy criterion of a solution is left as a difficult problem. This paper shows the reciprocity for the diffraction efficiencies of the reflected and transmitted waves, numerically. It is suggested that the reciprocity can be used the criterion.
- Numerical method of applying shadow theory to all regions of multilayered dielectric gratings in conical mounting, Hideaki Wakabayashi, Masamitsu Asai, Keiji Matsumoto, Jiro Yamakita, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 33(11), 2188 - 2197, Nov. 2016 , RefereedSummary:Nakayama's shadow theory first discussed the diffraction by a perfectly conducting grating in a planar mounting. In the theory, a new formulation by use of a scattering factor was proposed. This paper focuses on the middle regions of a multilayered dielectric grating placed in conical mounting. Applying the shadow theory to the matrix eigenvalues method, we compose new transformation and improved propagation matrices of the shadow theory for conical mounting. Using these matrices and scattering factors, being the basic quantity of diffraction amplitudes, we formulate a new description of three-dimensional scattering fields which is available even for cases where the eigenvalues are degenerate in any region. Some numerical examples are given for cases where the eigenvalues are degenerate in the middle regions. (C) 2016 Optical Society of America
- Quasi-Isotropic Chiral Particles Composed of Twisted Thin-Wire Staples, Masamitsu Asai, Hideaki Wakabayashi, Jiro Yamakita, 2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP), 2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP), 1, 182 - 183, 2016 , RefereedSummary:Effective constitutive characteristics of three-dimensional periodic array of quasi-isotropic chiral particles composed of thin-wire twisted staples are analyzed. The Lorentz' approach is applied with the method of moments to evaluate the isotropy of the resultant medium. The cancellation of electric quadrupole moments is also checked for evaluation.
- A Scattering Field Expression by Dielectric Gratings Using Circularly Poarized Waves, Hideaki Wakabayashi, Masamitsu Asai, Jiro Yamakita, IEICE TRANSACTIONS ON ELECTRONICS, IEICE TRANSACTIONS ON ELECTRONICS, E98C(2), 162 - 165, Feb. 2015 , RefereedSummary:In the scattering problem of dielectric gratings in conical mounting, we have considered and formulated scattering fields using transverse electric (TE) and transverse magnetic (TM) waves. This paper formulates scattering fields by superpositions of right-circularly (RC) and left-circularly (LC) polarized waves through the matrix eigenvalue method.
- Analysis of Low Grazing Scattering by Dielectric Gratings in Conical Mounting Using Scattering Factors, Hideaki Wakabayashi, Masamitsu Asai, Keiji Matsumoto, Jiro Yamakita, IEICE TRANSACTIONS ON ELECTRONICS, IEICE TRANSACTIONS ON ELECTRONICS, E97C(1), 50 - 57, Jan. 2014 , RefereedSummary:In the shadow theory, a new description and a physical mean at a low grazing limit of incidence on gratings in the two dimensional scattering problem have been discussed. In this paper, by applying the shadow theory to the three dimensional problem of multilayered dielectric periodic gratings, we formulate the oblique primary excitation and introduce the scattering factors through our analytical method, by use of the matrix eigenvalues. In terms of the scattering factors, the diffraction efficiencies are defined for propagating and evanescent waves with linearly and circularly polarized incident waves. Numerical examples show that when an incident angle becomes low grazing, only specular reflection occurs with the reflection coefficient 1, regardless of the incident polarization. It is newly found that in a circularly polarized incidence case, the same circularly polarized wave as the incident wave is specularly reflected at a low grazing limit.
- Numerical Methods for Composite Dielectric Gratings Embedded with Conducting Strips Using Scattering Factors, Hideaki Wakabayashi, Masamitsu Asai, Keiji Matsumoto, Jiro Yamakita, IEICE TRANSACTIONS ON ELECTRONICS, IEICE TRANSACTIONS ON ELECTRONICS, E96C(1), 19 - 27, Jan. 2013 , RefereedSummary:We propose a new analytical method for a composite dielectric grating embedded with conducting strips using scattering factors in the shadow theory. The scattering factor in the shadow theory plays an important role instead of the conventional diffraction amplitude. By specifying the relation between scattering factors and spectral-domain Green's functions, we derive expressions of the Green's functions directly for unit surface electric and magnetic current densities, and apply the spectral Galerkin method to our formulation. From some numerical results, we show that the expressions of the Green's functions are valid, and analyze scattering characteristics by composite gratings.
- Numerical Methods of Multilayered Dielectric Gratings by Application of Shadow Theory to Middle Regions, Hideaki Wakabayashi, Keiji Matsumoto, Masamitsu Asai, Jiro Yamakita, IEICE TRANSACTIONS ON ELECTRONICS, IEICE TRANSACTIONS ON ELECTRONICS, E95C(1), 44 - 52, Jan. 2012 , RefereedSummary:In the scattering problem of periodic gratings, at a low grazing limit of incidence, the incident plane wave is completely cancelled by the reflected wave, and the total wave field vanishes and physically becomes a dark shadow. This problem has received much interest recently. Nakayama et al. have proposed "the shadow theory". The theory was first applied to the diffraction by perfectly conductive gratings as an example, where a new description and a physical mean at a low grazing limit of incidence for the gratings have been discussed. In this paper, the shadow theory is applied to the analyses of multilayered dielectric periodic gratings, and. is shown to be valid on the basis of the behavior of electromagnetic waves through the matrix eigenvalue problem. Then, the representation of field distributions is demonstrated for the cases that the eigenvalues degenerate in the middle regions of multilayered gratings in addition to at a low grazing limit of incidence and some numerical examples are given.
- Availability of resistive boundary condition for thin metallic gratings placed in conical mounting, H Wakabayashi, J Yamakita, M Asai, H Inai, IEICE TRANSACTIONS ON ELECTRONICS, IEICE TRANSACTIONS ON ELECTRONICS, E87C(9), 1560 - 1567, Sep. 2004 , RefereedSummary:The scattering problem by metallic gratings has become one of fundamental problems in electromagnetics. In this paper, a thin metallic grating placed in conical mounting is treated as a lossy dielectric grating expressed by complex permittivity and thickness. The solution of the metallic grating by using the matrix eigenvalue, calculations is compared with that of the plane grating by using the resistive boundary condition and the spectral Galerkin procedure, and the availability of the resistive boundary condition for thin metallic gratings in conical mounting is investigated. In order to improve the convergence of the solutions of thin metallic gratings, the spatial harmonies of flux densities which are continuous function instead of electromagnetic fields are used.
- Analysis of diffraction from a uniaxial chiral slab with a two-dimensional array of patches, M Asai, J Yamakita, H Wakabayashi, ELECTRICAL ENGINEERING IN JAPAN, ELECTRICAL ENGINEERING IN JAPAN, 147(3), 1 - 8, May 2004 , RefereedSummary:Diffraction from a uniaxial chiral slab with a two-dimensional periodic array of conducting patches is analyzed by the matrix-based approach. Equatorial anisotropy is assumed for the chirality and permittivity whose optical axis is parallel to the plane of incidence. In the analysis, the total fields are given by the superposition of the current-dependent scattering fields, which are expanded in terms of the two-dimensional space harmonics and the incidence fields. The coupled mode equations for the equatorial uniaxial chiral media give the general solutions of fields as superpositions of elliptically polarized eigenmodes. The unknown currents on the patches are determined by applying the method of moments to the boundary conditions of the conducting array. In the numerical computations, the polarization characteristics of diffracted waves are investigated considering the design parameters. (C) 2004 Wiley Periodicals, Inc.
- Analysis of Diffraction from a Uniaxial Chiral Slab with a Two-Dimensional Array of Patches, Masamitsu Asai, Jiro Yamakita, Hideaki Wakabayashi, IEEJ Transactions on Fundamentals and Materials, IEEJ Transactions on Fundamentals and Materials, 123(3), 239 - 245, 2003 , RefereedSummary:Diffraction from a uniaxial chiral slab with a two-dimensional periodic array of conducting patches is analyzed by the 4 × 4 matrix-based approach. Equitorial anisotropy is assumed for the chirality whose optical axis is parallel to the plane of incidence. In the analysis, the total fields are given by the superposition of the current-dependent scattered fields which are expanded in terms of the two-dimensional space harmonics and the primary fields. The coupled mode equations for the equitorial uniaxial chiral media give the general solutions of fields as the superposition of elliptically-polarized eigen modes. The unknown currents on the patches are determined by applying Moment method to the boundary condition of the conducting array. In the numerical computations, the polarization characteristics of diffracted waves are investigated considering the design parameters. © 2003, The Institute of Electrical Engineers of Japan. All rights reserved.
- Analysis of diffracted waves from a grounded uniaxial chiral medium with a plane metallic grating, Masamitsu Asai, Jiro Yamakita, Hideaki Wakabayashi, Junya Ishii, IEEJ Transactions on Fundamentals and Materials, IEEJ Transactions on Fundamentals and Materials, 121(10), 899 - 904, 2001 , Refereed
- Analysis of infinitely thin dielectric gratings with surface relief, H Wakabayashi, J Yamakita, K Matsumoto, M Asai, ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS, ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS, 82(12), 38 - 47, Dec. 1999 , RefereedSummary:The spectral Galerkin procedure is often used for analyzing metallic gratings which are assumed to be zero-thickness plane gratings, In: this report, thin surface relief dielectric gratings with complex permittivity are discussed and analyzed by using the numerical approach for metallic plane gratings with surface impedance. From numerical results for dielectric gratings by the conventional method and metallic plane gratings by the spectral Galerkin procedure, the relations between dielectric and plane gratings are investigated. In addition, some numerical results for infinitely thin gratings with various surface reliefs are given and the differences between surface profiles are investigated. (C) 1999 Scripta Technica.
- Effectiveness of resistive boundary conditions for plane gratings, H Wakabayashi, J Yamakita, K Matsumoto, M Asai, ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS, ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS, 80(12), 7 - 17, Dec. 1997 , RefereedSummary:The spectral Galerkin procedure is often used to analyze scattering by metallic gratings. The resistive boundary condition is applied to metallic gratings that are assumed to be zero-thickness plane gratings. However, it is difficult to simulate plane gratings without knowing the limits of thickness in the application of such boundary conditions. In this report, the relations between a plane metallic grating and a thin dielectric grating with complex permittivity are investigated by using the conventional method for dielectric gratings. From numerical results, the effectiveness of resistive boundary conditions is discussed. (C) 1998 Scripta Technica.
- Simulation and design of thin film of RC-circuits, J Ishii, J Kodama, S Hontsu, K Murakami, Y Noguchi, M Asai, SIMULATION IN INDUSTRY: 9TH EUROPEAN SIMULATION SYMPOSIUM 1997, SIMULATION IN INDUSTRY: 9TH EUROPEAN SIMULATION SYMPOSIUM 1997, 1, 617 - 620, 1997 , RefereedSummary:It is shown in this presentation that RC-thin film circuits composed of lamination by insulators and metallic films are well simulated using nodal analysis of single layered RC distributed lines, giving data base for intelligent simulation,design and methodology of multilayered RC films.
- Scattering from an infinite array of slots with polar-type anisotropic media, M Asai, J Yamakita, S Sawa, J Ishii, IEICE TRANSACTIONS ON ELECTRONICS, IEICE TRANSACTIONS ON ELECTRONICS, E79C(10), 1371 - 1377, Oct. 1996 , RefereedSummary:4 x 4 matrix-based analysis of electromagnetic waves scattered anisotropic media are presented. In the analysis, the total fields are given as sum of the fields which exist even if the apertured plane are replaced by a ground plane and the fields scattered From the magnetic currents within the apertures. The scattered fields are expanded in terms of two-dimensional Floquet modes. Expression of each fields are obtained through eigenvalue problem for 4 x 4 coupled wave matrix. Unknown magnetic currents in the apertures are determined by applying Galerkin's method to the continuity condition about the magnetic fields in the apertures. Calculated results for isotropic cases are compared with other results for the complementary problem available in the literature using Babinet's principle. Further numerical calculations are performed in the case of gratings with polar-type anisotropic slab.
- Simulation and design of tap-feeded multi-wires for mobile communication filters, J Ishii, K Murakami, S Hontsu, M Asai, MODELLING AND SIMULATION 1996, MODELLING AND SIMULATION 1996, Vol. 10, pp. 17-22, 574 - 576, 1996 , RefereedSummary:Multi-coupled wires are formulated in the form of nodal equation allowing to speedy simulation at circuit-level.
- SCATTERING BY 2-DIMENSIONAL RECTANGULAR RESISTIVE PLANE GRATINGS WITH ANISOTROPIC SLAB, M ASAI, J YAMAKITA, S SAWA, J ISHII, IEICE TRANSACTIONS ON ELECTRONICS, IEICE TRANSACTIONS ON ELECTRONICS, E78C(10), 1453 - 1459, Oct. 1995 , RefereedSummary:We present a 4 x 4 matrix-based analysis of scattering from a two-dimensional rectangular resistive plane gratings placed on an anisotropic dielectric slab. The solution procedure used is formulated by extending the 4 x 4 matrix approach[14]. The fields are expanded in terms of two-dimensional Floquet modes. Total fields can be given as sum of primary and secondary fields whose expression are obtained through eigenvalue problem of coupled wave matrix. Unknown currents on resistive patches are determined by applying Galerkin's method to the resistive boundary condition on resistive grating. Results are compared with other numerical examples available in the literature for isotropic cases. Further, numerical calculation are performed in the case of gratings with polar-type anisotropic slab.
- ELECTROMAGNETIC-WAVE ABSORPTION IN MULTILAYERED ANISOTROPIC MODELS OF TISSUE, M ASAI, J YAMAKITA, S SAWA, J ISHII, IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE TRANSACTIONS ON COMMUNICATIONS, E77B(6), 766 - 769, Jun. 1994 , RefereedSummary:Electromagnetic power absorption in multilayered tissue media including anisotropic muscle regions whose principal dielectric axes (that is, muscle fibers) have various directions are analyzed by using 4x4 matrix method. Numerical calculations in 10 kHz-10 MHz show the effects of orientation of muscle fibers and polarization of incident wave on absorbed power density in tissues.
- Analysis of ferrite slab waveguides with resistive strip gratings, Akira Ozaki, Masamitsu Asai, Jiro Yamakita, Shinnosuke Sawa, Electronics and Communications in Japan (Part II: Electronics), Electronics and Communications in Japan (Part II: Electronics), 76(6), 13 - 22, 1993 , RefereedSummary:An analysis and numerical calculation of a leaky wave propagating in a magnetic waveguide with a resistive strip grating are presented. The analysis is formulated by a matrix. A characteristic equation of the waveguide is derived by applying the Galerkin method to a resistive boundary condition expressed by a Green function in a spectrum region for a magnetic material and also by a surface current density which is expanded in terms of functions. A numerical calculation is made for a leaky region where the effect of a surface resistance and magnetic loss are considered. A step function and a function with a singularity are used in expanding a surface current density. The validity of limiting expansion terms and the convergence of solutions are discussed for not only a propagation constant but also a root mean square error of the resistive boundary condition and a surface current density. Copyright © 1993 Wiley Periodicals, Inc., A Wiley Company
- POLARIZATION CHARACTERISTICS OF PLANE-WAVES SCATTERED BY A STRIP GRATING WITH AN ANISOTROPIC SUBSTRATE, M ASAI, J YAMAKITA, S SAWA, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E75A(12), 1765 - 1767, Dec. 1992 , RefereedSummary:In this paper, scattering waves by a strip grating with an anisotropic substrate for the incidence of inclined polarization are analyzed, and polarization characteristics of scattered waves are calculated. For simplicity, the analysis is limitted to the case of normal incidence and a perfectly conducting strip grating is assumed.

- Textbook for Understanding of Electrical Circuit with Mathematization and Working Problems, H. Nakano, M. Asai, Joint author, CORONA Publishing Co. LTD, 2012 05 , 4339008346
- Give and take relationship between life and electronics, Life, Science Club, Joint author, Chapter 1, DENKISHOIN CO., LTD, 2006 , 448530017X
- Inventions and applications of micro-structures giving novel functions, M. Asai, J. Yamakita, K. Matsumoto, H. Wakabayashi, Joint author, Part 2, Chapter 1 , Section 4, TIC CO., LTD, 2005 , 4924890618
- The leading edge of carbon technology in electronic and medical devices (in Japanese), M. Asai, J. Yamakita, K. Matsumoto, H. Wakabayashi, Joint author, Chapter 1 , Section 7, TIC, 2004 , 4924890677

- 2013 , 2013 JSST International Conference on Simulation Technology, Outstanding Presentation Award
- 1996 , The Institute of Electrical Engineers of Japan, IEEJ Symposium Distinguished Paper Award

- Foundations of Biological Systems Engineering, Graduate School of Kindai University
- Laws and Regulations of Telecommunications, Kindai University
- An Introduction to Maxwell's Equations, Kindai University
- An Introduction to Electromagnetic Waves, Wakayama University
- Interdisciplinary Science on Medical Care and Daily Life, Kindai University
- Computational Science of Electromagnetic Waves, Graduate School of Kindai University
- Computer Architecture, Kindai University
- Microwave Engineering, Kindai University
- Numerical Analysis, Kindai University
- Applied Mathematics, Kindai University
- Laws and Regulations of Radio Waves, Kyoto University
- Active Circuits, Kindai University
- Passive Circuits, Kindai University
- Electromagnetics, Kindai University