ACHIEVEMENTS

Journals

  1. G. Ichikawa, E. Omori, A. Nagata, A. Kumashiro, K. Kizaki, S. Saruwatari, and H. Wakatsuchi, “Numerical Validation of a MOSFET-Based Control Circuit for High-Power Intelligent Reflecting Surfaces for Wireless Power Transfer Applications.” Sci. Rep.(Under review) Preprint
  2. S. Vellucci, A. Monti, M. Barbuto, H. Wakatsuchi, A. Toscano, and F. Bilotti, “Pulse-driven Reconfigurable Transmissive Huygens’ Metasurface for Beam-Steering,” IEEE J. Sel. Topics Electromagn. Antennas Propag. (JSTEAP) (Under review).
  3. D. Erricolo, P. Y. Chen, D. A. Pham, D. Tuninetti, A. Alù, Y. Kasahara, V. G. Ataloglou, M. Di Renzo, F. Costa, F. Bilotti, A. Monti, A. Massa, W. Hong, H. Wakatsuchi, F. Yang, and X. Zong, “Reconfigurable Intelligent Surfaces: Recent Advances and Future Perspectives for the Next Generation of Communication Systems,” IEEE J. Sel. Topics Electromagn. Antennas Propag. (JSTEAP) (Under review).
  4. P. T. Dang, K. Suzuki, Y. Ashikaga, Y. Tsuchiya, S. Phang, and H. Wakatsuchi, “Metasurface Tape for Efficient Millimeter-Wave Power Transfer via Surface-Wave Propagation.” Appl. Phys. Lett., vol. 128, p. 201701, May. 2026. Link
  5. E. Omori, K. Takimoto, A. Nagata, A. Fathnan, S. Sugiura, and H. Wakatsuchi, “An Experimental Validation of Reconfigurable Intelligent Surfaces Achieving Pulse Width-Modulated Singular Reflection Angles without External Power Sources.” IEEE Trans. Veh. Technol., 2026 (to be published). Preprint
  6. R. Miyamoto and H. Wakatsuchi, “Power- and Time-Dependent Equivalent Circuit Models for Waveform-Selective Metasurfaces with Varying Electromagnetic Responses to Repeated Pulses at the Same Frequency,” J. Phys. D: Appl. Phys., vol. 59, p. 045301, Jan. 2026. Link
  7. K. Takimoto, P. Njogu, T. Ramachandran, T. Kondo, M. Mori, D. Anzai, and H. Wakatsuchi, “Millimeter-Wave and Sub-Terahertz-Band Beamforming Facilitated by Paper-Based Passive Intelligent Reflecting Surfaces,” Adv. Eng. Mater., vol. 27, p. 2500911, Oct. 2025. Link
  8. K. Ozawa and H. Wakatsuchi, “Experimental Validation of the Diverse Incident Angle Performance of a Pulse-Width-Dependent Antenna Based on a Waveform-Selective Metasurface in a Reverberation Chamber,” AIP Adv., vol. 15, p. 045025, Apr. 2025. Link
  9. K. Tachi, K. Suzuki, K. Takimoto, S. Saruwatari, K. Niitsu, R. Ikea, T. Ramachandran, A. Nagata, P. Njogu, and H. Wakatsuchi, “Multipath Signal-Selective Metasurface: Passive Time-Varying Interlocking Mechanism to Vary Spatial Impedance for Signals with the Same Frequency,” Phys. Rev. Lett., vol. 134, p. 157001, Apr. 2025 (Selected as Editors' suggestion). Link
  10. Y. Kunitomo, K. Takimoto, S. Vellucci, A. Monti, M. Barbuto, A. Toscano, F. Bilotti, T. Ramachandran, P. Njogu, P. T. Dang and H. Wakatsuchi, “Passive Time-Varying Waveform-Selective Metasurfaces for Attainment of Magnetic Property Control,” APL Mater., vol. 12, p. 111104, Nov. 2024. Link
  11. K. Suzuki, P. T. Dang, H. Homma, A. A. Fathnan, Y. Ashikaga, Y. Tsuchiya, S. Phang, and H. Wakatsuchi, “Experimental and Numerical Validation of Tape-Based Metasurfaces in Guiding High-Frequency Surface Waves for Efficient Power Transfer,” Appl. Phys. Lett., vol. 125, p. 181701, Oct. 2024. Link
  12. M. Tashiro, K. Ide, K. Asano, S. Ishii, Y. Sugiura, A. Uchiyama, A. A. Fathnan, and H. Wakatsuchi, “Metasurface-Enabled Multifunctional Single-Frequency Sensors without External Power,” NPG Asia Mater., vol. 16, p. 55, Oct. 2024. Link
  13. K. Suzuki, P. T. Dang, H. Homma, A. A. Fathnan, S. Phang, and H. Wakatsuchi, “Improved Numerical Estimation Method for Surface Wave Attenuation on Metasurfaces,” Adv. Theory Simul., vol. 7, issue 6, p. 2301173, Apr. 2024. Link
  14. Y. Cheng, R. Xing, F. Chen, H. Luo, A. A. Fathnan, and H. Wakatsuchi, “Terahertz Pseudo-Waveform-Selective Metasurface Absorber Based on a Square-Patch Structure Loaded with Linear Circuit Components,” Adv. Photon. Res., vol. 5, issue 8, p.2300303, Aug. 2024 (invited) (Selected as Advanced Best of 2025). Link
  15. J. Ino, H. Wakatsuchi, and S. Sugiura, “Noncoherent Reconfigurable Intelligent Surface with Differential Modulation and Reflection Pattern Training,” IEEE Wireless Commun. Lett., vol.13, issue 3, pp. 656-660, Mar. 2024. Link
  16. Y. Qian, Y. Cheng, H. Luo, F. Chen, A. A. Fathnan, and H. Wakatsuchi, “Design of a Dual-Band Waveform-Selective Metasurface Absorber Based on the Combination of Two Resonator Structures Loaded with Nonlinear Circuits,” Adv. Theory Simul., vol. 7, issue 4, p. 2300590, Jan. 2024. Link
  17. H. Takeshita, A. A. Fathnan, D. Nita, A. Nagata, S. Sugiura, and H. Wakatsuchi, “Frequency-Hopping Wave Engineering with Metasurfaces,” Nat. Commun., vol. 15, p. 196, Jan. 2024. Link
  18. K. Takimoto, K. Nakamura, P. Njogu, K. Suzuki, M. Sugimoto, A. A. Fathnan, T. Kondo, M. Mori, D. Anzai, and H. Wakatsuchi, “Inkjet Printed Intelligent Reflecting Surface for Indoor Applications,” Electron. Lett., vol. 59, issue 23, Nov. 2023. Link
  19. H. Takeshita, D. Nita, Y. Cheng, A. A. Fathnan, and H. Wakatsuchi, “Dual-Band Waveform-Selective Metasurfaces for Reflection Suppression,” Appl. Phys. Lett., vol. 123, issue 19, p. 191703, Nov. 2023. Link
  20. Y. Cheng, Y. Qian, H. Homma, A. A. Fathnan, and H. Wakatsuchi, “Waveform-Selective Metasurface Absorber with a Single-Patch Structure and Lumped Nonlinear Circuit for a Higher-Order Mode,” IEEE Trans. Antennas Propag., vol. 71, issue 11, pp. 8677-8691, Nov. 2023. Link
  21. A. A. Fathnan, K. Takimoto, M. Tanikawa, K. Nakamura, S. Sugiura, and H. Wakatsuchi, “Unsynchronized Reconfigurable Intelligent Surfaces with Pulse-Width-Based Design,” IEEE Trans. Veh. Technol., vol. 72, issue 11, pp. 15103-15108, Nov. 2023. Link
  22. K. Takimoto, H. Takeshita, A. A. Fathnan, D. Anzai, S. Sugiura, and H. Wakatsuchi, “Perfect Pulse Filtering Under Simultaneous Incidence at the Same Frequencies with Waveform-Selective Metasurfaces,” APL Mater., vol. 11, issue 8, p. 081116, Aug. 2023. Link
  23. S. Imai, H. Homma, K. Takimoto, M. Tanikawa, J. Nakamura, M. Kaneko, Y. Osaki, K. Niitsu, Y. Cheng, A. A. Fathnan, and H. Wakatsuchi, “Design and Analysis for the SPICE Parameters of Waveform-Selective Metasurfaces Varying with the Incident Pulse Width at a Constant Oscillation Frequency,” Sci. Rep., vol. 13, p. 7202, May. 2023. Link
  24. Y. Cheng, Y. Qian, Z. Li, H. Homma, A. A. Fathnan, and H. Wakatsuchi, “The Design of Metasurface Absorber Based on the Ring-Shaped Resonator Lumped with Nonlinear Circuit for a Pulse Wave, ” Journal of Electronics & Information Technology, vol. 45, no. 10, pp. 3812-3820, Apr. 2023. Link
  25. D. Ushikoshi, R. Higashiura, K. Tachi, A. A. Fathnan, S. Mahmood, H. Takeshita, H. Homma, M. R. Akram, S. Vellucci, J. Lee, A. Toscano, F. Bilotti, C. Christopoulos, and H. Wakatsuchi, “Pulse-Driven Self-Reconfigurable Meta-Antennas,” Nat. Commun., vol. 14, p. 633, Feb. 2023. Link
  26. A. A. Fathnan, H. Homma, S. Sugiura, and H. Wakatsuchi, “Method for Extracting the Equivalent Admittance From Time-Varying Metasurfaces and Its Application to Self-Tuned Spatiotemporal Wave Manipulation,” J. Phys. D: Appl. Phys., vol. 56, p. 015304, Nov. 2022. Link
  27. M. Tashiro, A. A. Fathnan, Y. Sugiura, A. Uchiyama, and H. Wakatsuchi, “Metasurface-Inspired Maintenance-Free Internet of Things Tags Characterised in Both Frequency and Time Domains,” Electron. Lett., vol. 58, issue 25, pp. 937-939, Dec. 2022 (Selected as Top Cited Article). Link
  28. H. Wakatsuchi, and S. Phang, “Waveform-Selective Metasurfaces and Their Potential Applications in Wireless Communications,” Reviews of Electromagnetics, vol. 1, pp.33-34, Nov. 2022. Link
  29. H. Homma, M. R. Akram, A. A. Fathnan, J. Lee, C. Christopoulos, and H. Wakatsuchi, “Anisotropic Impedance Surfaces Activated by Incident Waveform,” Nanophotonics, vol. 11, no. 9, pp. 1989-2000, Feb. 2022 (invited). Link
  30. T. Nakasha, S. Phang, and H. Wakatsuchi, “Pseudo-Waveform-Selective Metasurfaces and Their Limited Performance,” Adv. Theory Simul., vol. 4, no. 1, p. 2000187, Jan. 2021. Link
  31. R. Aihara and H. Wakatsuchi, “Metasurfaces for Efficient Digital Noise Absorption,” Sci. Rep., vol. 10, p. 17101, Oct. 2020. Link
  32. M. Tanikawa, D. Ushikoshi, K. Asano, K. Sanji, M. Ikeda, D. Anzai, and H. Wakatsuchi, “Metasurface Sensing Difference in Waveforms at the Same Frequency with Reduced Power Level,” Sci. Rep., vol. 10, p. 14283, Aug. 2020. Link
  33. K. Asano, T. Nakasha, and H. Wakatsuchi, “Simplified Equivalent Circuit Approach for Designing Time-Domain Responses of Waveform-Selective Metasurfaces,” Appl. Phys. Lett., vol. 116, p. 171603, Apr. 2020 (*contributed equally). Link
  34. D. Ushikoshi, M. Tanikawa, K. Asano, K. Sanji, M. Ikeda, D. Anzai, and H. Wakatsuchi, “Experimental Demonstration of Waveform-Selective Metasurface Varying Wireless Communication Characteristics at the Same Frequency Band of 2.4 GHz,” Electron. Lett., vol. 56, issue 3, pp.160-162, Feb. 2020. Link
  35. H. Wakatsuchi, “Numerical Demonstration of Non-Reciprocal Waveform-Selective Metasurfaces,” Electron. Lett., vol. 55, issue 6, pp. 312–314, Mar. 2019. Link
  36. H. Wakatsuchi, J. Long, and D. Sievenpiper, “Waveform Selective Surfaces,” Adv. Funct. Mater., vol. 29, issue 11, p. 1806386, Mar. 2019 (Selected as a Video Abstract Link). Link
  37. A. Li, Z. Luo, H. Wakatsuchi, S. Kim, and D. Sievenpiper, “Nonlinear, Active, and Tunable Metasurfaces for Advanced Electromagnetics Applications,” IEEE Access, vol. 5, pp. 27439-27452, Nov. 2017 (invited) (*: equal contribution). Link
  38. H. Wakatsuchi, D. F. Sievenpiper, and C. Christopoulos, “Designing Flexible and Versatile Metamaterial Absorbers,” IEEE EMC Magazine, vol. 5, issue 2, pp. 76-82, Aug. 2016 (invited). Link
  39. 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, Aug. 2016. Link
  40. 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, p. 041903, Jan. 2016. Link
  41. H. Wakatsuchi, “Time-Domain Filtering of Metasurfaces,” Sci. Rep., vol. 5, p. 16737, Nov. 2015. Link
  42. 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, Aug. 2015. Link
  43. 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, issue 9, pp. 2971–2982, Jul. 2015. Link
  44. H. Wakatsuchi, “Waveform-Selective Metasurfaces with Free-Space Wave Pulses at the Same Frequency,” J. Appl. Phys., vol. 117, p. 164904, Apr. 2015. Link
  45. 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, Apr. 2015 (Highlighted by Yomiuri Shimbun and other 3 newspapers). Link
  46. H. Wakatsuchi, S. Kim, J. J. Rushton, and D. F. Sievenpiper, “Waveform-Dependent Absorbing Metasurfaces,” Phys. Rev. Lett., vol. 111, p. 245501, Dec. 2013 (Highlighted by Nature, 505, 490-491, Dec. 2023 Link and Asahi Shimbun.). Link
  47. 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, issue 24, pp. 1530–1531, Nov. 2013 (Selected as a featured article). Link
  48. 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, p. 214103, May. 2013. Link
  49. 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, issue 6, pp. 1298–1301, Sep. 2012. Link
  50. 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, issue 12, pp. 5743–5752, Aug. 2012. Link
  51. 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, issue 8, pp. 3670–3678, May. 2012. Link
  52. H. Wakatsuchi and C. Christopoulos, “Generalized Scattering Control Using Cut-Wire-Based Metamaterials,” Appl. Phys. Lett., vol. 98, p. 221105, Jun. 2011. Link
  53. H. Wakatsuchi, S. Greedy, C. Christopoulos, and J. Paul, “Customised Broadband Metamaterial Absorbers for Arbitrary Polarisation,” Opt. Express, vol. 18, issue 21, pp. 22187–22198, Oct. 2010. Link
  54. 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, Jul. 2010. Link
  55. 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, Jun. 2007. Link

Conferences

  1. P. T. Dang, Y. Ashikaga, Y. Tsuchiya, K. Suzuki, S. Phang and H. Wakatsuchi, “Efficient Millimeter-wave Propagation Achieved by Tape-based Metasurfaces ,” 2025 PhotonIcs & Electromagnetics Research Symposium (PIERS), Chiba, Japan, 5 Nov. - 9 Nov. 2025.
  2. R. Ikeya, H. Shiokawa, and H. Wakatsuchi, “A Large-scale Database Search Method for Real-time Estimation of Scattering Objects ,” 2025 PhotonIcs & Electromagnetics Research Symposium (PIERS), Chiba, Japan, 5 Nov. - 9 Nov. 2025.
  3. A. Nagata, S. Sugiura, and H. Wakatsuchi, “Passive High-speed Switching Metasurfaces ,” 2025 PhotonIcs & Electromagnetics Research Symposium (PIERS), Chiba, Japan, 5 Nov. - 9 Nov. 2025.
  4. E. Omori, K. Takimoto, A. Nagata, S. Sugiura, and H. Wakatsuchi, “Experimental Validation of Passive Reconfigurable Intelligent Surfaces Varying in the Time Domain in Accordance with the Pulsed Waveform ,” 2025 PhotonIcs & Electromagnetics Research Symposium (PIERS), Chiba, Japan, 5 Nov. - 9 Nov. 2025.
  5. H. Wakatsuchi, “Circuit-Based Metasurfaces Varying in Time and Space without Additional Power Supply ,” The Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2025, pp. VI-446, Amsterdam, Netherlands, 1 Sep. - 6 Sep. 2025 (invited).
  6. A. Kumashiro, K. Kizaki, T. Fujihashi, S. Sugiura, H. Wakatsuchi, T. Watanabe and S. Saruwatari, “IRS-Aided Microwave Power Transfer Using Curve Fitting-Based Phase Optimization,” 2025 IEEE 101st Vehicular Technology Conference, Oslo, Norway, 17 Jun. - 20 Jun. 2025.
  7. A. Kumashiro, K. Kizaki, T. Fujihashi, S. Sugiura, H. Wakatsuchi, T. Watanabe and S. Saruwatari, “Design and Implementation of Intelligent Reflecting Surface for Microwave Power Transmission,” IEEE International Conference on Computer Communications, London, United Kingdom, 19 May. - 22 May. 2025.
  8. S. Vellucchi, A. Monti, M. Barbuto, H. Wakatsuchi, A. Toscano, and F. Bilotti, “Radiation and Scattering Control of Antennas Through Self-Tuning Metasurfaces with Frequency and Time-Domain Selective Properties,” 19th European Conference on Antennas and Propagation, Stockholm, Sweden, 30 Mar. - 4 Apr. 2025.
  9. S. Vellucchi, A. Monti, M. Barbuto, A. A. fathnan, M. Karamirad, M. Longhi, D. Ramaccia, L. Stefanini, H. Wakatsuchi, A. Toscano, and F. Bilotti, “Design of Self-Reconfigurable Huygens Metasurfaces for Antenna Applications,” The Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2024, Crete, Greece, 9 Sep. - 14 Sep. 2024.
  10. H. Wakatsuchi, “Passive Time-Varying Circuit-Based Metasurfaces and their Applications,” The Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2024, Crete, Greece, 9 Sep. - 14 Sep. 2024 (invited).
  11. H. Wakatsuchi and A. A. Fathnan, “Waveform-Selective Metasurfaces Varying in Time and Space at the Same Frequencies in Accordance with Pulse Width,” META 2024, 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Toyama, Japan, 16 Jul. - 19 Jul 2024 (invited).
  12. H. Wakatsuchi, “Additional Selectivity at the Same Frequencies with Waveform-Selective Metasurfaces and their Applications,” The Seventeenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2023, pp. VI-358, Crete, Greece, 11 Sep. - 16 Sep. 2023 (invited).
  13. S. Vellucci, A. Monti, M. Barbuto, A. A. Fathnan, M. Karamidad, M. Longhi, D. Ramaccia, L. Stefanini, H. Wakatsuchi, A. Toscano, and F. Bilotti, “Waveform-selective Huygens Metasurfaces for Antenna Applications,” 2024 IEEE International Symposium on Antennas and Propagation and ITNC-USNC-URSI Radio Science Meeting, pp. 1033-1034, Florence, Italy, 14 Jul. - 19 Jul. 2024.
  14. A. A. Fathnan, H. Takeshita, D. Nita, S. Sugiura, and H. Wakatsuchi, “Enabling Frequency-hopping Selectivity with Locally Self-tuned Metasurfaces,” The Seventeenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2023, pp. X-105-107, Crete, Greece, 11 Sep. - 16 Sep. 2023.
  15. K. Takimoto, A. A. Fathnan, S. Sugiura, and H. Wakatsuchi, “Passive Reconfigurable Intelligent Surfaces with Varying Electromagnetic Response in Accordance with the Pulse Width at the Same Frequency,” The Seventeenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2023, pp. X-371-373, Crete, Greece, 11 Sep. - 16 Sep. 2023.
  16. M. Tashiro, A. A. Fathnan, Y. Sugiura, A. Uchiyama, and H. Wakatsuchi, “Multifunctional Metasurface-Based Sensors Operating at a Single Frequency,” The Seventeenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2023, pp. X-379-381, Crete, Greece, 11 Sep. - 16 Sep. 2023.
  17. K. Niitsu, J. Nakamura, M. Kaneko, Y. Osaki, and H. Wakatsuchi, “A 351pW Stand-By Power 0.017mm2 37.4GHz Fully Integrated LC Oscillator-Based OOK Transmitter Using Low-Leakage Switch in 22nm CMOS,” 2023 International Conference on Solid State Devices and Materials, Nagoya, Japan, 5 Sep. - 8 Sep. 2023.
  18. K. Suzuki, H. Homma, A. A. Fathnan, Y. Ashikaga, Y. Tsuchiya, S. Phang, and H. Wakatsuchi, “Metasurface-Based Tapes for Efficient Transmission of High-Frequency Signals,” XXXXVth URSI General Assembly and Scientific Symposium, Sapporo, Japan, 19 Aug. - 26 Aug. 2023.
  19. R. Miyamoto, A. A. Fathnan, and H. Wakatsuchi, “Simplified Equivalent Circuit Models for Waveform-Selective Metasurfaces Responding to Repeated Pulses,” XXXXVth URSI General Assembly and Scientific Symposium, Sapporo, Japan, 19 Aug. - 26 Aug. 2023.
  20. M. Tashiro, A. Uchiyama, Y. Sugiura, A. A. Fathnan, and H. Wakatsuchi, “Maintenance-Free Metasurface-based Sensing,” XXXXVth URSI General Assembly and Scientific Symposium, Sapporo, Japan, 19 Aug. - 26 Aug. 2023.
  21. A. A. Fathnan and H. Wakatsuchi, “Controlling Beam Directions using Self-reconfigurable Time-varying Metasurfaces,” XXXXVth URSI General Assembly and Scientific Symposium, Sapporo, Japan, 19 Aug. - 26 Aug. 2023.
  22. H. Homma, J. Lee, and H. Wakatsuchi, “Anisotropic Waveform-Selective Metasurfaces,” XXXIV General Assembly and Scientific Symposium of the International Union of Radio Science, pp. Tu-FIP-B22-15, Rome, Italy, 28 Aug. - 4 Sept. 2021.
  23. H. Takeshita, D. Nita, and H. Wakatsuchi, “Multi-Band Waveform-Selective Metasurfaces and Their Application,” XXXIV General Assembly and Scientific Symposium of the International Union of Radio Science, pp. Tu-FIP-D10-2, Rome, Italy, 28 Aug. - 4 Sept. 2021.
  24. R. Higashiura and H. Wakatsuchi, “Reconfigurable Antennas Based on Waveform-Selective Metasurfaces,” XXXIV General Assembly and Scientific Symposium of the International Union of Radio Science, pp. Tu-FIP-D10-3, Rome, Italy, 28 Aug. - 4 Sept. 2021.
  25. H. Wakatsuchi and M. Tanikawa, “Transient Wavefront Shaping Based on Waveform-Selective Metasurface,” XXXIV General Assembly and Scientific Symposium of the International Union of Radio Science, pp. Tu-FIP-D10-4, Rome, Italy, 28 Aug. - 4 Sept. 2021.
  26. H. Wakatsuchi, R. Higashiura, H. Takeshita, and D. Nita, “Multi-Band Waveform-Selective Metasurfaces Transmitting Continuous Waveforms Based on More Than One Frequency,” Metamaterials'2020 the 14th International Congress on Artificial Materials for Novel Wave Phenomena, pp. X-284-X-286, New York, US, 28 Sept. - 3 Oct. 2020.
  27. H. Wakatsuchi, D. Ushikoshi, S.M. Mahmood, R. Higashiura, C. Smartt, and C. Christopoulos, “Antenna Applications Based on Waveform-Selective Metasurfaces Varying Time-Domain Responses at the Same Frequency,” Metamaterials'2019 the 13th International Congress on Artificial Materials for Novel Wave Phenomena, pp. X-459-X-461, Rome, Italy, 16-21 Sept. 2019.
  28. M. Tanikawa, K. Asano, D. Ushikoshi, K. Sanji, M. Ikeda, D. Anzai, and H. Wakatsuchi, “Waveform-Selective Metasurfaces Responding to Low-Power Signals,” Progress In Electromagnetics Research Symposium, Toyama, Japan, August 2018.
  29. T. Nakasha, K. Asano, D. Ushikoshi, J. Long, D.F. Sievenpiper, and H. Wakatsuchi, “Ultra-Broadband Metasurface Absorbers,” Progress In Electromagnetics Research Symposium, Toyama, Japan, August 2018.
  30. D. Nita, K. Asano, D. Ushikoshi, and H. Wakatsuchi, “Design of Dual-Band Waveform-Selective Metasurfaces,” Progress In Electromagnetics Research Symposium, Toyama, Japan, August 2018.
  31. H. Wakatsuchi and D.F. Sievenpiper, “Waveform-Selective Absorbing Metasurfaces,” Progress In Electromagnetics Research Symposium, Toyama, Japan, August 2018 (invited).
  32. D. Ushikoshi, K. Asano, K. Sanji, M. Ikeda, D. Anzai, and H. Wakatsuchi, “Response of Waveform-Selective Metasurfaces to Wi-Fi Signals,” Progress In Electromagnetics Research Symposium, Toyama, Japan, August 2018.
  33. K. Asano and H. Wakatsuchi, “Application of Waveform-Selective Metasurfaces to Electromagnetic Interference Issues,” Progress In Electromagnetics Research Symposium, Toyama, Japan, August 2018.
  34. K. Asano and H. Wakatsuchi, “Time-Domain Responses of Waveform-Selective Metasurfaces,” IEEE APS/URSI 2018, pp. 1477-1478, Boston, US, July 2018.
  35. D. Ushikoshi and H. Wakatsuchi, “Metasurfaces to Control Direction of Wave Propagation at the Same Frequency,” IEEE APS/URSI 2018, pp. 1891-1892, Boston, US, July 2018.
  36. H. Wakatsuchi and D. F. Sievenpiper, “Waveform-Selective Scattering Control through Circuit-Based Metasurfaces at the Same Frequency,” IEEE APS/URSI 2017, pp. 67-68, San Diego, US, July 2017.
  37. 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.
  38. D. Sievenpiper, R. Quarfoth, H. Wakatsuchi, Z. Luo, “Nonlinear, Active, and Anisotropic Impedance Surfaces,” 9th European Conference on Antennas and Propagation, Lisbon, Portugal, April, 2015.
  39. 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, Copenhagen, Denmark, Aug. 2014.
  40. 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.
  41. 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.
  42. 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.
  43. 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.
  44. 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.
  45. 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.
  46. 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.
  47. 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.
  48. 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.
  49. 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.
  50. 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.
  51. 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.
  52. 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.
  53. 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.
  54. 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.
  55. 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.
  56. 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.