Young-Seok Lee > Researchers | 서울대학교 전자파 융합 연구실

International Journals

S. Kim, Y.-S. Lee, and S. Nam*, "Wideband Dual-Polarized End-Fire Slit Horn Antenna with Tightly Coupled Dipole and Monopole Probe Arrays," IEEE Transactions on Antennas and Propagation (TAP), early access, Jul. 2025.
T. Yoon, U. Park, M. Kim, S. Lee, Y.-S. Lee, S. Nam, and J. Oh*, "A Topology-based Array Compensation Empowered by Equivalent Current Modeling of TM10 Patch Antennas for Cross-Polarization Reduction," IEEE Open Journal of Antennas and Propagation (OJAP), early access, Jul. 2025.
Y.-S. Lee, T. Yoon, Y.J. Song, S.K. Hong, J. Oh, and S. Nam*, “Transmission-Conversion Efficiency Maximization Technique for MIMO Wireless Power Transfer Systems in ISAC Applications,” IEEE Antennas and Wireless Propagation Letters (AWPL), early access, Jun. 2025.
Y.-S. Lee, T. Yoon, M. Kim, S. Lee, B. Jung, J. Oh, and S. Nam*, “A Design and Characterization Method of a Scalable Large Transmitting Array for Wireless Power Transfer,” IEEE Transactions on Microwave Theory and Techniques (TMTT), vol. 73, no. 6, pp. 3346-3358, Jun. 2025.
H.Y. Kim, Y.-S. Lee, and S. Nam*, “Efficiency Bound Estimation for a Practical Microwave and mmWave Wireless Power Transfer System Design,” Journal of Electromagnetic Engineering and Science (JEES), vol. 23, no. 1, pp. 69-74, Jan. 2023.

International Conferences

Y.-S. Lee, T. Yoon, J. Oh, and S. Nam*, “Design and Calibration of a CW Time Reversal Wireless Power Transfer Transmitter with Pilot Signal Detection," 2025 Asia-Pacific Microwave Conference (APMC 2025), Jeju, Rep. of Korea, Dec. 2-5, 2025. (Invited Paper)
Y.-S. Lee, J. Oh, and S. Nam*, “Effects of Magnitude Dynamic Range Constraints on MIMO Wireless Power Transfer Efficiency," 2025 International Symposium on Antennas and Propagation (ISAP 2025), Fukuoka, Japan, Oct. 27-31, 2025.
T. Yoon, Y.-S. Lee, M. Kim, S. Lee, J. Lee, S. Nam, and J. Oh*, "Overcoming Efficiency Degradation in Wireless Power Transfer Systems: A Supply Voltage Modulation Method Empowered by 5.64-GHz 256-Element Antenna Array Receiving 10.6-Watt," 2025 IEEE MTT-S International Microwave Symposium (IMS 2025), San Francisco, CA, USA, Jun. 15-20, 2025.
Y.-S. Lee, J. Oh, and S. Nam*, “Sequential Feedback-Based Phase Optimization Using Hadamard Basis for Wireless Power Transfer,” 2025 IEEE Wireless Power Technology Conference and EXPO (WPTCE 2025), Rome, Italy, Jun. 3-6, 2025. (Selected for Ph.D. Students Initiative Program)
Y.-S. Lee, J. Oh, and S. Nam*, “An Effect of Time Reversal Based Multiple Beacon Selection on Wireless Power Transfer Performance,” 2024 International Symposium on Antennas and Propagation (ISAP 2024), Incheon, Rep. of Korea, Nov. 5-8, 2024. (Best Paper Award, 2nd Prize)
Y.-S. Lee, T. Yoon, S. Lee, M. Kim, J. Lee, J. Oh, and S. Nam*, “LUT-Based Transmit Mode Calibration Reduction Method for Wireless Power Transfer,” 2024 IEEE Wireless Power Technology Conference and EXPO (WPTCE 2024), Kyoto, Japan, May 8-11, 2024. (Selected for Student Travel Grant)
Y.-S. Lee and S. Nam*, “Test Count Reduction Algorithm for Determining the Optimal Phase in Wireless Power Transfer using Bayesian Optimization,” XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), Sapporo, Japan, Aug. 19-26, 2023.

Domestic Conferences

Y.-S. Lee, T. Yoon, J. Oh, and S. Nam*, “Received DC Power Maximization in a Practical Wireless Power Transfer Systems,” 2025 KIEES Winter Conf., Feb. 2025. (Best Paper Award, 1st Place)
T. Yoon, Y.-S. Lee, M. Kim, S. Lee, and J. Oh*, “Comprehensive Optimization of Beamforming Wireless Power Transfer: Achieving 500W Power Saving through Hardware-Aware Convex Method and Supply Voltage Modulation,” 2025 KIEES Winter Conf., Feb. 2025.
Y.-S. Lee, S. Nam, and J. Oh*, “Convex optimization을 통한 RF-DC 효율 향상 기법이 적용된 고효율 무선전력전송 시스템,” 2024 KIEES Summer Conf., Aug. 2024.
H.Y. Kim, Y.-S. Lee, and S. Nam*, “마이크로파 무선전력전송에서 다중 수신기의 충전을 위한 알고리즘 연구,” 2021 KIEES Autumn Conf., Nov. 2021.

Patents

S. Nam and Y. Lee, “METHOD FOR DETERMINING OPTIMAL PHASES OF ANTENNA ARRAY IN RECONFIGURABLE INTELLIGENT SURFACE AND RIS SYSTEM USING THE SAME” (Patent No.: 1027047370000 (2024.09.04))
S. Nam and Y. Lee, “METHOD FOR DETERMINING OPTIMAL PHASES OF ANTENNA ARRAY IN TRANSMISSION ANTENNA AND A BEAM FOCUSING ARRAY SYSTEM USING THE SAME” (Patent No.: 1026925510000 (2024.08.01))