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) for his 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 design that achieves dual-resonant frequency operation using a single-layer structure with a single antenna type, and experimentally demonstrates 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-selective boundary conditions referred to as Frequency-Reconfigurable Boundaries (FRB). Through these innovations, the proposed design demonstrates advantages in both size and performance compared with conventional phased-array antenna research.

Based on these results, the work was highly recognized for its superior performance compared with previously reported studies worldwide, leading to the Honorable Mention distinction.

The IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting (IEEE AP-S/URSI) 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 APS/URSI 2025 Student Paper Competition, and Lee’s work was selected for Honorable Mention.

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