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• D. Komata, T. Shimizu, Y. Kogami,"Temperature dependence measurements of complex permittivity for dielectric plates using 80GHz resonator for the cutoff circular waveguide method ," (in Japanese) ibid, MW2012-, pp., Nov. 2012.(to be published)
• T. Shimizu, , "［Special Talk］Report on 2012 IEEE MTT-S International Microwave Symposium," (in Japanese) ibid, MW2012-, pp., Nov. 2012.(to be published)
• T. Kawakami, T. Shimizu, Y. Kogami, "Measurements of the modulation index and Vp value for a MZ type optical modulator using a CPW resonator," (in Japanese) ibid, MW2012-100, pp.111-114, Oct. 2012.
• T. Shimoyamada, T. Shimizu, Y. Kogami, "Study on Evaluation of the relative permittivity of a gas using a cylindrical cavity resonator," (in Japanese) ibid, MW2012-99, pp.105-110, Oct. 2012.
• Y. Shimoda, K. Kikuchi, T. Shimizu, Y. Kogami,"Experimental study on the microwave surface resistance of the copper-clad dielectric substrates," (in Japanese) ibid, MW2012-98, pp.99-104, Oct. 2012.
• H. Nakano, T. Shimizu, T. Ohno, N. Kawaguchi, Yasutake Hirachi, "Cryogenic 36--45 GHz InP Low-Noise Amplifier MMIC's with Improved Noise Temperature by Eliminating Parasitic Parallel Plate Modes," Publ. Astron. Soc. Japan 64, 71 [7 pages], Aug. 2012.
• T. Shimizu, D. Komata, Y. Kobayashi, Yoshinori Kogami, "Frequency dependence measurements of complex permittivity for vaurious dielectric materials in millimeter wave region," Proceeding of Thailand-Japan Microwave 2012 TJMW2012, TH4-5, Aug. 2012.
• T. Shimizu, "High-precision dielectric measurement techniques in microwave and millimeter-wave regions," Tutorial digest of Thailand-Japan Microwave 2012 TJMW2012, MW-4, Aug. 2012.
• Takashi Shimizu, Y. Kogami, "NRD guide excited millimeter wave narrow bandpass filter using sapphire disk resonators," IEICE Transaction on Electronics, vol.E94-C, no. 7, pp.1226-1230, Jul. 2012.
• T. Shimizu, Yoshinori Kogami, "An NRD guide excited millimeter wave narrow bandpass filter using Whispering Gallery mode high-Q resonators," 2012 IEEE MTT-S Int. Microwave Symp. Digest, TH3C-4, Jun. 2012 .
• T. Shimizu, Y. Kawahara, S. Akasaka, Y. Kogami, "Complex Permittivity Measurement of Aluminum Nitride by the cut-off circular waveguide method from 40GHz to 100GHz," Proceeding of the Asia Pacific Microwave Conference 2011, pp.1450-1453, Dec. 2011.
• T. Shimizu, Y. Kogami, "Study on a NRD guide excited millimeter wave bandpass filter using sapphire disk resonators," (in Japanese) ibid, MW2011-119, pp.35-40, Nov. 2011.
• D. Komata, M. Nakamura, T. Shimizu, Y. Kogami,"Frequency dependence measurement of complex permittivity of quartz glass plates in 40 to 80GHz band," (in Japanese) ibid, MW2011-114, pp.5-8, Nov. 2011.
• T. Shimizu, Y. Kawahara, S. Akasaka, Y. Kogami, "Development of a 100GHz Grooved Circular Empty Cavity for Complex Permittivity Measurements in W band," IEICE Transaction on Electronics, vol.E94-C, no. 10, pp.1650-1656, Oct. 2011.
• D. Komata, M. Nakamura, T. Shimizu, Y. Kogami,"Frequency dependence measurement of complex permittivity for quartz glass plates by the cutoff circular waveguide method," (in Japanese) 2011 IEICE Society Conf., C-2-75, p.99, Sep. 2011.
• T. Shimizu, S. Sasaki, H. Nakano, Y. Kogami, Y/ Hirachi, "Evaluation for influence of millimeter wave CPW transmission line by flip chip packaging," (in Japanese) 2011 IEICE Society Conf., C-2-67, p.91, Sep. 2011.
• T.Shimizu, Y.Kawahara, S.Akasaka, Y.Kogami, "Complex Permittivity Measurements of a PTFE Substrate in W Band by the Cut-off Circular Waveguide Method," 2011 China-Japan Joint Microwave Conf. Proc. pp.501-504, Apr. 2011.
• Y.Kogami, T.Shimizu, W.Watanabe, "Evaluation of millimeter wave anisotropic permittivities of the dielectric laminate substrates using WG resonator method," 2011 China-Japan Joint Microwave Conf. Proc. pp.497-500, Apr. 2011.
• T. Shimziu, Y. Kogami, Y. Hirachi, "Frequency dependence measurement of complex permittivity for AlN plate from 20-100GHz," (in Japanese) 2011 IEICE General Conf., , C-2-49, p.87, Mar. 2011.
• T. Shimizu, H. Nakano, Y. Hirachi, Y. Kogami, Millimeter Wave Surface Mount Package Capable of Mesurement with or without Printed Circuit Boards for Secondary Packaging" (in Japanese) IEICE Transaction on Electronics, vol.J93-C,No.12, pp.630-637, Dec. 2010.
• T. Shimizu, S. Akasaka, Y. Kawahara, Y. Kogami, "A 100GHz Grooved Circular Empty Cavity for Low Loss Dielectric Substrate Measurements in W Band," 2010 Asia Pacific Microwave Conference Proceedings, FR2E-3, pp.1701-1704, Dec. 2010.
• W. Watanabe, M. Nakamura, T. Shimizu, K. Kikuchi, Y. Kogami, Evaluation of millimeter wave complex permittivities of the dielectric laminate substrates using WG resonator method," (in Japanese) ibid, MW2010-106, pp.7-10, Nov. 2010.
• T. Shimizu,Y. Kawahara, S. Akasaka, Y. Kogami, "Study on complex permittivity measurements in the W band by cut-off circular waveguide method," (in Japanese) ibid, MW2010-106, pp.7-10, Nov. 2010.
• W. Tomiyama, T. Shimizu, Y. Kogami, "Study on the structure of the bottom conductor layer for CBCPW on the low-resistivity silicon substrate," (in Japanese) 2008 IEICE Society Conf., C-2-67, p.103, Sep. 2010.
• M. Nakamura, T. Shimizu, T.Komiyatani, Y. Kogami, "Uniformity measurements of complex permittivity for dielectric substrates by the cutoff circular waveguide method ," (in Japanese) 2008 IEICE Society Conf., C-2-34, p.70, Sep. 2010.
• W. Tomiyama, T. Shimizu, Y. Kogami, "Study of the structure for CPW and 1st metal layer on the low-resistivity silicon substrate," (in Japanese) ibid, MW2010-81, pp.81-84, Sep. 2010.
• T. Shimizu, "Necessity of millimeter wave filter from the viewpoint of broadcasting field,"(in Japanese) Proc. of Electronics, Information and Systems Conf. Electronics, Information and Systems Society, IEE, TC17-1, pp.582-583, Sep. 2010.
• Y. Kobayashi，T. Shimizu, "Millimeter-wave measurement methods of copper-clad dielectric laminate substrates and the measured results,"(in Japanese) Proc. of Electronics, Information and Systems Conf. Electronics, Information and Systems Society, IEE, TC16-3, pp.576-581, Sep. 2010.
• Y. Kogami, T. Shimizu，M. Nakamura，W. Watanabe, "The recent advances on dielectric substrates for millimeter-wave circuits and the evaluation techniques of their dielectric constants,"(in Japanese) Proc. of Electronics, Information and Systems Conf. Electronics, Information and Systems Society, IEE, TC16-1, pp.566-569, Sep. 2010.
• T. Shimizu, H. Nakano, Y. Kogami, Y. Hirachi, "Study of influences of underfill material on flip chip millimeter-wave integrated circuits,"(in Japanese) Proc. of Japan Institute of Electronics Packaging, Vol.10, No.2, pp.17-22, Jul. 2010.
• T. Shimizu, M. Nakamura, Y. Kogami, "Study on the complex permittivity measurements for underfill materials using the cutoff waveguide method," (in Japanese) ibid, vol. 110, no. 25, MW2010-23, pp. 51-54, May. 2010.
• R. Adachi, K. Shimauchi, T. Shimizu, Y. Kogami, "Temperature Characteristic Measurements of Relative Permittivity for Dielectric Materials in Millimeter Wave Band," (in Japanese) ibid, vol. 110, no. 25, MW2010-14, pp. 1-6, May. 2010.
• T. Shimizu, M. Nakamura, Y. Kogami, "Complex permittivity measurements of underfill materials at 50GHz and 70GHz band,"(in Japanese) 2010 IEICE General Conf., C-2-57, Mar. 2010.
  
• T. Shimizu, H. Nakano, R. Suga, Y. Kogami, Y. Hirachi, "Study of influences of underfill material on millimeter-wave MMIC,"(in Japanese) 24th Japan Institute of Electornics Packaging, 10B-4, pp.24-25, Mar. 2010.
  
• S. Oosawa, M. Nakamura, T. Shimizu, Y. Kogami, "Study on the complex permittivity measurements for millimeter-wave dielectric substrate materials using the WG mode resonator method," (in Japanese) ibid, vol.109, no.431, MW2009-188, pp.53-58, Mar. 2010.
  
• T. Nakazato, T. Toyoshima, T. Shimizu, Y. Kogami, "Study on design of planar resonator circuits for LiNbO3 optical modulators ," (in Japanese) ibid, vol.109, no.431, MW2009-187, pp.49-52, Mar. 2010.
  
• T. Shimizu, H. Nakano, Y. Hirachi, Y. Kogami, "Study of effects of unwanted transmission modes in millimeter-wave CPW MMIC,"(in Japanese) IEICE Transaction on Electronics, vol.J92-C, no. 12, pp.789-796, Dec. 2009.
• T. Shimizu, H. Nakano, Y. Kogami, Y. Hirachi, "Development of millimeter wave surface mount package capable of measurement with or without printed circuit boards for secondary packaging," (in Japanese) ibid, MW2009-140, pp.69-74, Nov. 2009.
• T. Shimizu, H. Nakano, Y. Kogami, Y. Hirachi, "Effects of unwanted transmissin line modes in millimeter-wave CPW MMIC," (in Japanese) 2009 IEICE General Conf., C-2-9, Mar. 2009.
• Y. Kogami, M. Yanagase, T. Shimizu, H. Yoda, Y. Ishikawa, "Study of taperd dielectric waveguide using electromagnetic field simulators and a modal analysis technique," (in Japanese) ibid, MW2008-130, pp.67-72, Nov. 2008.
• T. Shimizu, Y. Kogami, H. Nakano, Y. Hirachi, "Study of effects of unwanted transmission modes in millimeter-wave CPW MMIC using 3D EM simulator," (in Japanese) ibid, MW2008-131, pp.73-78, Nov. 2008.
• H. Nakai, T. Shimizu, Y. Kobayashi, Z. Ma, "Complex permittivity measurements of dielectric substrates using multimode TE_0m1 for empty cavity method," (in Japanese) 2008 IEICE Society Conf., C-2-45, Sep. 2008.
• Y. Kogami, T. Shimizu, S. Oosawa, N. Abe, "Evaluation of the Millimeter-Wave Characteristics of Dielectric Substrates by using Whispering Gallery Mode Resonators," Chaina-Japan Joint Microwave Conferecne CJMW2008, Sept. 2008.
  
  
• T. Shimizu, Y. Kawahara, T. Yoneyama, "Wideband NRD guide and Rectangular Waveguide H-Plane Transition at 60GHz band," IEICE Transaction on Electronics, vol.E90-C, no. 12, Dec. 2007.
• T. Yoneyama, H. Sawada, T. Shimizu, "NRD-Guide Passive Components and Devices for Millimeter Wave Wireless Applications," IEICE Transaction on Electronics, vol.E90-C, no. 12, pp.2170-2177, Dec. 2007.
• T. Shimizu, Y. Kawahara, T. Nakagawa, T. Yoneyama, "A Waveguide Compatible NRD guide E-plane Bandpass Filter for 55GHz band OFDM Applications," IEICE Transaction on Electronics, vol.E90-C, no. 9, Sep. 2007.
• T. Shimizu, Y. Kawahara, T. Nakagawa, T. Yoneyama, "A 55GHz 5-pole NRD guide E-plane Bandpass Filter for Millimeter Wave OFDM Applications," Proceedings of the 2006 Asia-Pacific Microwave Conference, Dec. 2006.
• T. Shimizu, T. Yoneyama "60GHz Bandpass Filter Using NRD guide E-plane Resonators," IEICE Transaction on Electronics, vol.E89-C, no. 12, pp.1851-1857, Dec. 2006
• T.Shimizu, Y.Hirokawa, T.Yoneyama, Y.Kobayashi, "Examinations of Thermoplastic Materials for NRD Guide using the Cut-off Circular Waveguide Method," IEICE Trans. Electron., vol.J89-C, no.12, pp.1079-1081, Dec. 2006.
• T. Shimizu, T. Yoneyama, "Waveguide compatible NRD guide E-plane narrow band bandpass filter for 55GHz band," (in Japanese) 2005 IEICE Society Conf., CS-2-7, Sep. 2006.
• T.Shimizu and T.Yoneyama, "60GHz wideband bandpass filter using NRD guide E-plane resonators," (in Japanese) ibid, MW2006-14, pp.13-16, May 2006.
• T.Shimizu and T.Yoneyama, "NRD-Guide and Waveguide H-Plane Transition and Its Application for Lens Antenna Feeding Structure," IEICE Trans. Electron., vol.J89-C, no.5, pp.312-320, May. 2006.
• T.Shimizu, Y.Kawahara and T.Yoneyama, "Applications of Millimeter Wave Transceiver to High-Speed Download & HDTV," Wireless Technology Park 2006, Apr. 2006.
• T.Shimizu and T.Yoneyama, "H-plane transition between NRD-guide and rectangular waveguide at 60GHz band," (in Japanese) 2004 IEICE General Conf., C-2-92, Mar. 2006.
• T.Shimizu and T.Yoneyama, "Feeding Structures for 60GHz Dielectric Lens Antenna with Low Sidelobes," IEICE Trans. Electron., Vol.J88-C, No.12, pp.1096-1105, Dec. 2005.
• T.Shimizu and T.Yoneyama, "Study of NRD-guide and Circular Waveguide H-plane Transition and its Application for Antenna Feeding Structure," (in Japanese) ibid, ED2005-170, MW2005-125, pp.69-74, Nov. 2005.
• T.Shimizu, Y.Hirokawa, T.Yoneyama, Y.Kobayashi, "Examinations of the Thermoplastic Materials for NRD Guide using the Cut-off Circular Waveguide Method," (in Japanese) 2005 IEICE Society Conf., C-2-107, p.168, Sep. 2005.
• T.Shimizu, T.Yoneyama, "A NRD Guide Fed Dielectric Lens Antenna with High Gain and Low Sidelobe Characteristics," IEICE Trans. Electron., Vol.E88-C, No. 7, pp.1385-1386, Jul. 2005.
• T.Shimizu, Y.Kawahara and T.Yoneyama, "Superspeed Millimeter-wave Transceiver and its Antenna using the NRD-guide Technology," (in Japanese) Telecom Summit 7th YRP Symposium 2005, Jun. 2005.
• T.Shimizu and T.Yoneyama, "NRD-guide fed dielectric lens antenna with low sidelobe characteristic," (in Japanese) 2004 IEICE General Conf.,, B-1-175, p.175, Mar. 2005.
• Y.Kawahara, H.Sawada, T.Shimizu and T.Yoneyama, "The Ultra High-speed Download System Using NRD-Guide Detector," (in Japanese) 2004 IEICE General Conf., C-2-135, p.168, Mar. 2005.
• T.Shimizu and T.Yoneyama, "Feed Structures for Dielectric Lens Antenna with Low Sidelobes," (in Japanese) ibid, ED2004-178, MW2004-209, pp.73-78, Dec. 2004.
• H.Sawada, T.Shimizu, T.Yoneyama, "Research and Development of Millimeter Wave Broadband Network Based on the NRD Guide Technology," (in Japanese) Telecom Summit 6th YRP Symposium 2004, Jul. 2004.
  
  
• T.Shimizu and Y.Kobayashi, "Measurement accuracy of the cut-off waveguide method in the millimeter wave measurements of complex permittivity of dielectric substrates," IEICE Trans. Electron., Vol.J87-C, No.12 pp.1131-1137, Dec. 2004.
• T.Kasashima, K.Obayashi, T.Shimizu and Y.Kobayashi, "70GHz Measurement of Complex Permittivity by Circular Cut-off Waveguide Method -A Study on Measured Results-," (in Japanese) ibid, ED2004-178, MW2004-194, pp.31-35, Nov. 2004.
• JIS R 1660-1:2004 Testing method for dielectric properties of fine ceramics in millimeter wave frequency range Part1:Cutoff waveguide method
• T.Shimizu and Y.Kobayashi, "Cut-off circular waveguide method for dielectric substrate measurements in millimeter wave range," IEICE Trans. Electron., Vol.E87-C, No. 5, pp.672-680, May 2004.
• T.Shimizu, Y.Kobayashi, T.Kasashima and K.Obayashi, "Complex permittivity measurements by the cut-off waveguide method using 80GHz cavities," (in Japanese) 2004 IEICE General Conf., C-2-83, pp.118, Mar. 2004.
• A.Orikasa, Y.Mitsui, T.Shimizu and Y.Kobayashi, "Measurements of complex permittivity of Crythnex substrates in 3-70 GHz range," (in Japanese) 2004 IEICE General Conf., C-2-82, pp.117, Mar. 2004.
• Y.Kobayashi, T.Shimizu and T.Hashimoto, "Posibility of Milimeter-wave HTS filter," (in Japanese) 2004 IEE General Conf., S16-1, Mar. 2004.
• T.Shimizu and Y.Kobayashi, "Complex permittivity measurements of low-loss dielectric plates in microwave and millimeter wave region," MWE2003 Microwave Workshop Digest, WS5-3, pp.137-142, Nov. 2003.
• T.Shimizu and Y.Kobayashi, "Design of 30GHz HTS bandpass filter using CPW slot resonators," (in Japanese) ibid, ED2003-168, MW2003-196, pp.37-42, Sep. 2003.
• T.Shimizu, T.Nishino and Y.Kobayashi, "Some discussions of the resonator structure for the cut-off waveguide method and the round robin test," 33nd European Microwave Conf. Proc., Oct. 2003.
• T.Shimizu and Y.Kobayashi, "Improvement of the resonator structure in the cut-off waveguide method and its measurement accuracy," (in Japanese) ibid, MW2003-142. pp.115-120, Sep. 2003.
• T.Shimizu, Z.Ma and Y.Kobayashi, "Design of a grooved circular cavity for dielectric substrate measurements in millimeter wave region," IEICE Trans. Electron., Vol. E86-C, No. 8, pp.1715-1720, Aug. 2003.
• T. Shimizu, Z. Ma and Y. Kobayashi, "Study of the design of a 30GHz HTS-CPW type BPF using l/4 resonator," (in Japanese) ibid, SCE2003-7,MW2003-7(2003-4), pp.37-42, Apr. 2003.
• T. Shimizu, Z. Ma and Y. Kobayashi, "Design of a 30GHz HTS bandpass filter using quarter-wavelength coplanar waveguide resonators,"(in Japanese) 2003 IEICE General Conf., C-2-96, pp.128, Mar. 2003.
• T. Shimizu, Y. Kobayashi, Evaluation of low-loss dielectric materials in millimeter wave region,"(in Japanese) 2003 IEICE General Conf., C-3-12, pp. S-53-54,Mar. 2003.
• T. Nishino, T. Shimizu, and Y. Kobayashi, "Round robin test on complex permittivity measurement by the cut-off circular waveguide method,"(in Japanese) 2003 IEICE General Conf., C-2-78, pp.110, Mar. 2003.
• T. Shimizu, Z. Ma and Y. Kobayashi, "Design of a grooved circular cavity for separating degenerate TE and TM modes in dielectric substrate measurements," 2002 Asia-Pacific Microwave Conf. Proc., No. TH4D-5, pp. 1019-1022, Nov. 2002.
• T. Shimizu and Y. Kobayashi, "Millimeter wave measurements of some low-loss dielectric plates by a novel cut-off circular waveguide method," 32nd European Microwave Conf. Proc., pp. 825-828, Sep. 2002.
• Y.Kobayashi, T.Shimizu, T.Hashimoto, "Microwave and millimeter wave evaluation techniques of low loss dielctric materials and high-temperature superconductors," 2002 China-Japan Joint Meeting on Microwaves(CJMW2002), A-2-7, pp.59-62, Apr. 2002.
• T.Shimizu, S.Harigai, Y.Kobayashi, "Complex permittivity measurements of three families of organic materials in the millimeter wave region," (in Japanese) 2002 IEICE General Conf., C-2-87, pp.124, Mar. 2002.
• T.Shimizu, Y.Kobayashi, "Measured results of some low-loss dielectric plates by cut-off circular waveguide method in millimeter wave region," 2002 Topical Symposium on Millimeter Waves. Digest, P-17, pp.191-194, Mar. 2002.
• S.Harigai, T.Shimizu, Y.Kobayashi, "A study on measured results of complex permittivity by circular cut-off waveguide method in millimeter wave region," (in Japanese) ibid, MW2001-137, pp.85-90, Dec. 2001.
• Y.Kobayashi, T.Shimizu, "Low-loss dielectric materials for millimeter wave and technical trend of its measurements," (in Japanese) ibid, ED2001-143, MW2001-103, pp.35-40, Nov. 2001.
• S.Harigai, T.Shimizu, Y.Kobayashi,"Measurements of complex permittivity by a circular cut-off waveguide method II - A study of measurement results for round robin test -," (in Japanese) 2001 IEICE Society Conf., C-2-76, pp.100, Sep. 2001.
• T.Shimizu, Satoshi Harigai, Y.Kobayashi,"Measurements of complex permittivity by a circular cut-off waveguide method I - A study of air gap effect -," (in Japanese) 2001 IEICE Society Conf., C-2-75, pp.99, Sep. 2001.
• T.Shimizu, T.Hashimoto, Zhwang Ma, Y.Kobayashi, "Microwave and millimeter wave evaluation software of high-temperature superconductor and low loss dielectric material," 4th Microwave Simulator Workshop, Sep. 2001.
• Y.Kobayashi, T.Shimizu, T.Hashimoto, "Microwave and millimeter wave evaluation techniques of low loss dielectric material and high-temperature superconductor," 1st Saitama Pref. Univ. Combination Seed Exhibition, No Digest, Jul. 2001.
• Y.Kobayashi, T.Shimizu, T.Hashimoto, Zhwang Ma, "Microwave and millimeter wave evaluation techniques of high-temperature superconductor and low loss dielectric material," (in Japanese) Telecom Summit 3rd YRP Symposium 2001, pp.50-52, Jul. 2001.
• T.Shimizu, and Y.Kobayashi, "Millimeter wave measurements of temperature dependence of complex permittivity of GaAs plates by a circular waveguide method," 2001 IEEE MTT-S Int. Microwave Symp. Digest, THIF-51, pp.2195-2198, Jun. 2001.
• T.Shimizu, Y.Kobayashi, "Measurement of temperature dependence of complex permittivity using higher order mode resonator," (in Japanese) 2001 IEICE General Conf., C-2-48, pp.95, Mar. 2001.
• T.Shimizu, and Y.Kobayashi, "50GHz measurements of temperature dependence of complex permittivity of dielectric plates by a cut-off circular waveguide method," 2001 Topical Symposium on Millimeter Waves. Digest, Mar. 2001.
• T.Shimizu, Y.Kobayashi, "Millimeter wave measurements of temperature dependence of complex permittivity of dielectric plates by a cavity resonance method with coaxial excitation," (in Japanese) ibid, ED2000-188, MW2000-145, pp.1-6, Nov. 2000.
• T.Shimizu, M.Shinohara, Y.Kobayashi,"Measurements of complex permittivity of high permittivity plates by a cavity resonance method," (in Japanese) 2000 IEICE General Conf., C-2-117, pp.168, Mar. 2000
• T.Shimizu, Y.Kobayashi, "Cavity resonance method (Measurement of a low loss dielectric plate)," (in Japanese) 1999 IEICE Society Conf., PC1-3,pp.311-312, Sep. 1999.
• Y.Kobayashi, T.Shimizu,"Millimeter wave measurements of temprature dependence of complex permittivity of dielectric plates by a cavity resonance method," 1999 IEEE MTT-S Int. Microwave Symp. Digest,pp.1885-1888. Jun. 1999.
• T.Shimizu, Y.Kobayashi, "Millimeter wave measurements of complex permittivity of dielectric plates by a cavity resonance method based on coaxial excitation," (in Japanese) ibid,MW99-25,pp.73-76, May. 1999.