Junghyo Lee (Integrated M.S.–Ph.D. student) from the Department of Electrical Engineering at POSTECH (advisor: Prof. Wonbin Hong) received an Honorable Mention in the Student Paper Competition at the 2025 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting (IEEE AP-S/URSI).

Lee presented a paper titled “Concept of Multi-Harmonic Operation in Phased Array Using Frequency-Reconfigurable Boundaries and Adaptive Unit-Spacing Tuning Operator.”

The paper proposes a phased-array antenna concept that achieves dual-resonant frequency operation using a single-layer structure with a single antenna type, while experimentally demonstrating high gain and wide beam coverage. The study introduces two novel concepts: a frequency-selective feeding structure called the Adaptive Unit-spacing Tuning Operator (AUTO) and Frequency-Reconfigurable Boundaries (FRB), which serve as frequency-selective boundary conditions. Through these innovations, the proposed design demonstrates advantages in both size and performance compared with conventional phased-array antenna approaches.

The work was highly recognized for its excellent performance and innovative design, leading to the Honorable Mention award among numerous submissions from around the world.

The IEEE AP-S/URSI symposium is the largest international conference in the field of antennas and propagation, organized by the IEEE Antennas and Propagation Society. The 2025 conference is being held in Ottawa, Canada. A total of 131 papers were submitted to the Student Paper Competition this year, and Lee’s work was selected for the Honorable Mention distinction.

Notably, Lee has received awards at this conference for two consecutive years, an achievement that is rare even among researchers worldwide.