ACHIEVEMENTS

Journals

  1. H. Wakatsuchi, D. F. Sievenpiper, and C. Christopoulos, "Designing Flexible and Versatile Metamaterial Absorbers," IEEE EMC Magazine, vol. 5, no. 2, pp. 76-82, 2016 (invited). Link
  2. H. Wakatsuchi, F. Gao, S. Yagitani, and D. F. Sievenpiper, "Responses of Waveform-Selective Absorbing Metasurfaces to Oblique Waves at the Same Frequency," Sci. Rep., vol. 6, p. 31371, 2016. Link
  3. H. Wakatsuchi, D. Anzai, and C. Smartt, “Visualization of Field Distributions of Waveform-Selective Metasurface,” IEEE Antennas Wirel. Propag. Lett., vol. 15, pp. 690–693, 2016. Link
  4. S. Kim, H. Wakatsuchi, J. J. Rushton, and D. F. Sievenpiper, “Switchable nonlinear metasurfaces for absorbing high power surface waves,” Appl. Phys. Lett., vol. 108, no. 4, p. 041903, Mar. 2016. Link
  5. H. Wakatsuchi, “Time-Domain Filtering of Metasurfaces,” Sci. Rep., vol. 5, p. 16737, 2015. Link
  6. F. Gao, F. Zhang, H. Wakatsuchi, and D. F. Sievenpiper, “Synthesis and Design of Programmable Subwavelength Coil Array for Near-Field Manipulation,” IEEE Trans. Microw. Theory Tech., vol. 63, no. 9, pp. 2971–2982, 2015. Link
  7. H. Wakatsuchi, “Waveform-selective metasurfaces with free-space wave pulses at the same frequency,” J. Appl. Phys., vol. 117, no. 16, p. 164904, 2015. Link
  8. H. Wakatsuchi, D. Anzai, J. J. Rushton, F. Gao, S. Kim, and D. F. Sievenpiper, “Waveform Selectivity at the Same Frequency,” Sci. Rep., vol. 5, p. 9639, 2015 (Highlighted by Yomiuri Shimbun and other 3 newspapers). Link
  9. H. Wakatsuchi, S. Kim, J. J. Rushton, and D. F. Sievenpiper, “Waveform-dependent absorbing metasurfaces,” Phys. Rev. Lett., vol. 111, no. 24, p. 245501, 2013 (Highlighted by Nature, 505, 490-491, 2014 Link and Asahi Shimbun.). Link
  10. H. Wakatsuchi, J. J. Rushton, J. Lee, F. Gao, M. Jacob, S. Kim, and D. F. Sievenpiper, “Experimental demonstration of nonlinear waveform-dependent metasurface absorber with pulsed signals,” Electron. Lett., vol. 49, no. 24, pp. 1530–1531, 2013 (Selected as a featured article). Link
  11. H. Wakatsuchi, S. Kim, J. J. Rushton, and D. F. Sievenpiper, “Circuit-based nonlinear metasurface absorbers for high power surface currents,” Appl. Phys. Lett., vol. 102, no. 21, p. 214103, 2013. Link
  12. H. Wakatsuchi, T. Sakai, S. Watanabe, M. Kojima, Y. Yamashiro, H. Sasaki, K. Sasaki, and O. Hashimoto, “Application of Reproducible Measurements of Complex Permittivities to Crystalline Lens From 500 MHz to 50 GHz,” IEEE Trans. Electromagn. Compat., vol. 54, no. 6, pp. 1298–1301, 2012. Link
  13. H. Wakatsuchi, J. Paul, and C. Christopoulos, “Performance of customizable cut-wire-based metamaterial absorbers: Absorbing mechanism and experimental demonstration,” IEEE Trans. Antennas Propag., vol. 60, no. 12, pp. 5743–5752, 2012. Link
  14. H. Wakatsuchi, J. Paul, S. Greedy, and C. Christopoulos, “Cut-wire metamaterial design based on simplified equivalent circuit models,” IEEE Trans. Antennas Propag., vol. 60, no. 8, pp. 3670–3678, 2012. Link
  15. H. Wakatsuchi and C. Christopoulos, “Generalized scattering control using cut-wire-based metamaterials,” Appl. Phys. Lett., vol. 98, no. 22, p. 221105, 2011. Link
  16. H. Wakatsuchi, S. Greedy, C. Christopoulos, and J. Paul, “Customised broadband metamaterial absorbers for arbitrary polarisation,” Opt. Express, vol. 18, no. 21, pp. 22187–22198, 2010. Link
  17. H. Wakatsuchi, S. Greedy, J. Paul, and C. Christopoulos, “Efficient modelling method for artificial materials using digital filtering techniques and emc applications,” IEICE Trans. Commun., vol. E93-B, no. 7, pp. 1760–1767, 2010. Link
  18. H. Wakatsuchi, M. Hanazawa, S. Watanabe, A. Nishikata, M. Kouzai, M. Kojima, Y. Yamashiro, K. Sasaki, and O. Hashimoto, “The Measurements of the Complex Permittivities of Blood Samples in Quasi-Millimeter Wave Bands,” IEICE Trans. Commun., vol. E90-B, no. 6, pp. 1357–1359, 2007. Link

Conferences (in English)

  1. H. Wakatsuchi and D.F. Sievenpiper, "Waveform-Selective Scattering Control through Circuit-Based Metasurfaces at the Same Frequency," IEEE APS/URSI 2017, San Diego, US, July 2017.
  2. H. Wakatsuchi and C. Smartt, "Field Visualisation of waveform-selective metasurfaces," Metamaterials'2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, Oxford, UK, 7-10 Sept. 2015.
  3. D. Sievenpiper, R. Quarfoth, H. Wakatsuchi, Z. Luo, "Nonlinear, Active, and Anisotropic Impedance Surfaces", 9th European Conference on Antennas and Propagation, Lisbon, Portugal, April 12-17, 2015.
  4. H. Wakatsuchi, J. Rushton, S. Kim, D. Sievenpiper, “Metasurfaces to select waveforms at the same frequency,” 8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, pp. 286-288, Aug. 2014.
  5. S. Kim, H. Wakatsuchi, J. J. Rushton, and D. F. Sievenpiper, “Nonlinear metamaterial surfaces for absorption of high power microwave surface currents,” 2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, Orlando, FL, July 2013.
  6. H. Wakatsuchi, S. Kim, J. J. Rushton, and D. F. Sievenpiper, “Numerical and experimental demonstration of nonlinear metamaterial surfaces designed for high power surface current absorption,” Metamaterials'2012 Sixth International Congress on Advanced Electromagnetic Materials in Microwave and Optics, pp. 514–516, St. Petersburg, Russia, Sep. 2012.
  7. H. Wakatsuchi, J. Paul, S. Greedy, and C. Christopoulos, “Performance enhancement of cut–wire–based metamaterial absorbers,” Metamaterials'2011 Fifth International Congress on Advanced Electromagnetic Materials in Microwave and Optics, pp. 555–557, Barcelona, Spain, Oct. 2011.
  8. J. Paul, S. Greedy, H. Wakatsuchi, and C. Christopoulos, “Measurements and Simulations of Enclosure Damping Using Loaded Antenna Elements,” EMC Europe 2011, pp. 676–679, York, U.K., Sep. 2011.
  9. H. Wakatsuchi, J. Paul, S. Greedy, and C. Christopoulos, “Contribution of Conductive loss to Cut–Wire Metamaterial Absorbers,” AP-RASC'10 2010 Asia-Pacific Radio Science Conference, pp. DC1–7, Toyama, Japan, Sep. 2010.
  10. H. Wakatsuchi and J. Paul, “Predictions of Resonant Frequency Shifts in Asymmetrical Cut–Wire Metamaterials,” Metamaterials'2010 Fourth International Congress on Advanced Electromagnetic Materials in Microwave and Optics, pp. 881–883, Karlsruhe, Germany, Sep. 2010.
  11. C. Christopoulos, J. D. Paul, D. W. P. Thomas, S. Greedy, H. Wakatsuchi, and M. H. Alsadi, “Characterisation and modelling of materials for electromagnetic shielding,” UK Magnetic Society Electromagnetic Field Protection, Abingdon, U.K., Apr. 2010.
  12. H. Wakatsuchi, S. Greedy, J. Paul, and C. Christopoulos, “Implementation of Digital Filtering Techniques to EBG structures and Metamaterials for Efficient Numerical Simulations,” UK URSI Festival of Radio Science, Birmingham, U.K., Dec. 2009.
  13. H. Wakatsuchi, S. Greedy, J. Paul, and C. Christopoulos, “Efficient Modelling of Band–gap and Metamaterial Structures in EMC,” 2009 International Symposium Electromagnetic Compatibility Kyoto, pp. 745–748, Kyoto, Japan, July 2009.
  14. T. Sakai, M. Hanazawa, H. Wakatsuchi, A. Nishikata, and O. Hashimoto, “Measurements of Dielectric Properties of Biological Tissues in Mm–wave Band by Free–space Reflection Method, Ellipsometry Method and Coaxial Probe Method,” Progress in Electromagnetics Research Symposium (PIERS) 2007, pp. 45, Prague, Czech Republic, Aug. 2007.
  15. H. Wakatsuchi, M. Hanazawa, T. Sakai, S. Watanabe, M. Kojima, Y. Yamashiro, K. Sasaki, and O. Hashimoto, “Complex Permittivities Measurements of Ocular Tissues in Quasi-Millimeter and Millimeter Wave Bands,” BEMS The Bioelectromagnetics Society 29th Annual Meeting, pp. 497–499, Kanazawa, Japan, June 2007.
  16. H. Wakatsuchi, M. Hanazawa, T. Sakai, S. Watanabe, M. Kojima, Y. Yamashiro, K. Sasaki, and O. Hashimoto, “The Complex Permittivities of Ocular Tissues at Millimeter-Wave Bands,” EBEA 2007 The European Bioelectromagnetics Association, pp. 56, Bordeaux, France, Apr. 2007.
  17. H. Wakatsuchi, M. Hanazawa, T. Sakai, S. Watanabe, M. Kojima, Y. Yamashiro, K. Sasaki, and O. Hashimoto, “Complex Permittivities Measurements of Eye Tissues in Quasi-millimeter Wave Band,” 2006 KMU Workshop on Ocular changes Induced by Electromagnetic Waves, Kanazawa, Japan, Dec. 2006.
  18. H. Wakatsuchi, M. Hanazawa, S. Watanabe, M. Kouzai, A. Nishikata, and O. Hashimoto, “Complex Permittivity Measurement of Blood in Millimeter Wave Band,” Progress in Electromagnetics Research Symposium (PIERS) 2006, pp. 127, Tokyo, Japan, Aug. 2006.
  19. M. Kouzai, A. Nishikata, H. Wakatsuchi, K. Fukunaga, M. Hanazawa, and S. Watanabe, “Complex Permittivity Measurement of Some Biological Materials at 33–50GHz by Dielectric Tube Method,” BEMS 28th Annual Meeting, pp. 312–316, Cancun, Mexico, June 2006.
  20. M. Hanazawa, H. Wakatsuchi, S. Watanabe, M. Kouzai, A. Nishikata, and O. Hashimoto, “Complex Permittivity Measurement of Blood by Probe Method,” BEMS 28th Annual Meeting, pp. 93–96, Cancun, Mexico, June 2006.
  21. H. Wakatsuchi, M. Hanazawa, S. Watanabe, A. Nishikata, M. Kozai, M. Kojima, Y. Yamashiro, K. Sasaki, and O. Hashimoto, “Complex Permittivity Measurement of Biological Tissues and Numerical Analysis of SAR Distribution in Quasi–Millimeter Wave Band,” 2nd Pan-Pacific EMC Joint Meeting PPEMC'06, Okayama, Japan, May 2006.

Conferences (in Japanese)

  1. 牛越大樹,浅野耕生,若土弘樹,“開放空間における波形選択メタサーフェスの特性,”電子情報通信学会,ソサイエティ大会,vol. C-2-39,pp. 47,東京,2017年9月.
  2. 井手虹介,牛越大樹,浅野耕生,石井智,若土弘樹,“光に応じた波形選択メタサーフェスの制御,”電子情報通信学会,ソサイエティ大会,vol. C-2-40,pp. 48,東京,2017年9月.
  3. 浅野耕生,牛越大樹,若土弘樹,“波形選択メタサーフェスの電磁界干渉問題への応用,”電子情報通信学会,ソサイエティ大会,vol. C-2-41,pp. 49,東京,2017年9月.
  4. 中舎朋之,浅野耕生,牛越大樹,Long Jiang,Daniel F. Sievenpiper,若土弘樹,“超広帯域メタサーフェス電波吸収体,”電子情報通信学会,ソサイエティ大会,vol. C-2-42,pp. 50,東京,2017年9月.
  5. 牛越大樹,浅野耕生,三治健一郎,池田正和,安在大祐,若土弘樹,“2.4GHz帯における波形選択メタサーフェスの開発,”電子情報通信学会,ソサイエティ大会,vol. C-2-45,pp. 55,札幌,2016年9月.
  6. 浅野耕生,牛越大樹,三治健一郎,池田正和,安在大祐,若土弘樹,“波形選択メタサーフェスの動作周波数と設計パラメータ,”電子情報通信学会,ソサイエティ大会,vol. C-2-46,pp. 56,札幌,2016年9月.
  7. 若土弘樹,“波形選択メタサーフェスによる散乱パラメータ操作,”電子情報通信学会,ソサイエティ大会,vol. C-2-47,pp. 57,札幌,2016年9月.
  8. 安在大祐,若土弘樹,“波形選択メタサーフェスを用いたOFDM伝送方式に関する一検討,” 放送技術研究会, 小樽, 2016年2月.
  9. 若土弘樹,“波形選択メタサーフェス,” 電子情報通信学会, 総合大会, vol. B–1–118, pp. 118, 草津, 2015年3月.
  10. 若土弘樹, 酒井泰二, 渡辺聡一, 橋本修, “5~50 GHzにおける液体生体組織の複素比誘電率に対する温度依存性,” 電子情報通信学会, 総合大会, vol. B–4–41, pp. 350, 北九州, 2008年3月.
  11. 若土弘樹, 酒井泰二, 渡辺聡一, 小島正美, 山代陽子, 佐々木一之, 橋本修, “5~50 GHzにおける眼組織の複素比誘電率測定に対する組織採取後の保存条件の影響,” 電子情報通信学会, ソサイエティ大会, vol. B–4–30, pp. 293, 鳥取, 2007年9月.
  12. 若土弘樹, 花澤理宏, 酒井泰二, 渡辺聡一, 小島正美, 山代陽子, 佐々木一之, 橋本修, “準ミリ波帯及びミリ波帯における眼組織の複素比誘電率測定,” 電子情報通信学会, 総合大会, vol. B–4–12, pp. 336, 名古屋, 2007年3月.
  13. 若土弘樹, 花澤理宏, 渡辺聡一, 小島正美, 山代陽子, 佐々木一之, 橋本修, “電気定数の不確定性及び血流による冷却を考慮したミリ波に曝露した家兎眼の熱解析,” 電子情報通信学会, ソサイエティ大会, vol. B–4–34, pp. 310, 金沢, 2006年9月.
  14. 若土弘樹, 花澤理宏, 渡辺聡一, 小島正美, 山代陽子, 佐々木一之, 橋本修, “血液の複素比誘電率測定における再現性の改善,” 電気学会, 全国大会, 1–124, vol. 1, pp. 154, 横浜, 2006年3月.
  15. 若土弘樹, 花澤理宏, 小島正美, 山代陽子, 渡辺聡一, 橋本修, 佐々木一之, “準ミリ波帯における血液の複素比誘電率測定,” 電子情報通信学会, ソサイエティ大会, vol. B–4–45, pp. 369, 札幌, 2005年9月.

Patents

  1. 安在大祐,若土弘樹,「波形選択性と時間領域制御を実現する通信端末,通話システム」,特願2014-257559
  2. 若土弘樹,「フィルタ」,特願2014-253858(25784-PCT,2015年7月15日)(JSTからPCT出願支援

Prizes (PI)

  1. 安藤博記念学術奨励賞、安藤研究所、2016年6月
  2. 電気通信普及財団賞、電気通信普及財団、2015年3月
  3. Research Grant, 8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics – Metamaterials2014, Copenhagen, Denmark, Aug. 2014.
  4. 船井学術奨励賞、船井情報科学財団、2014年4月
  5. Researcher Grant, Metamaterials'2011 Fifth International Congress on Advanced Electromagnetic Materials in Microwave and Optics, Oct, 2011
  6. AP–RASC’10 Student Paper Competition, Second Prize, AP-RASC'10 2010 Asia-Pacific Radio Science Conference, Sep. 2010
  7. York EMC Services Ltd Best Paper Prize, Festival of Radio Science URSI, Dec. 2009
  8. Graduate School Travel Prize, University of Nottingham, July 2009
  9. 青山学院大学スカラーシップ、青山学院大学、2007年5月
  10. 青山学院大学スカラーシップ、青山学院大学、2006年5月

Prizes (Students)

  1. 浅野耕正、電影会賞、電影会、2017年3月

Press

  1. 日刊工業新聞、2016年5月21日、21面
  2. 電気新聞、2016年3月15日、5ページ
  3. 日刊工業新聞、2015年6月17日、17面
  4. 中部経済新聞、2015年6月16日、3面
  5. 読売新聞、2015年6月1日、朝刊、25面
  6. 電子デバイス産業新聞、2015年4月23日、8面
  7. 朝日新聞、2014年2月21日、朝刊、24面