A new measurement technique on inherent-ring-resonance frequency using ring filters. - Hee-Ran Ahn; Kwyro Lee (IEICE Electron. Express, 2004)

Capacitive-loaded interstitial antennas for perfect matching and desirable SAR distributions. - Hee-Ran Ahn; Kwyro Lee (IEEE Trans. Biomed. Eng., 2006)

Design of Wideband Coupled Line DC Block with Compact Size. - Byungjoon Kim; Sangwook Nam; Hee-Ran Ahn; Jae-Hoon Song (IEICE Trans. Electron., 2014)

A Novel Wideband Compact Microstrip Coupled-Line Ring Hybrid for Arbitrarily High Power-Division Ratios. - Hee-Ran Ahn; Manos M. Tentzeris (IEEE Trans. Circuits Syst. II Express Briefs, 2017)

In-Phase T-Junction: Study and Application to Gysel Power Dividers for High Power-Division Ratios Requiring No High-Impedance Transmission-Line Section. - Hee-Ran Ahn; Manos M. Tentzeris (IEEE Access, 2019)

Compact and Wideband General Coupled-Line Ring Hybrids (GCRHs) for Arbitrary Circumferences and Arbitrary Power-Division Ratios. - Hee-Ran Ahn; Manos M. Tentzeris (IEEE Access, 2019)

Complex Impedance Transformers Based on Allowed and Forbidden Regions. - Hee-Ran Ahn; Manos M. Tentzeris (IEEE Access, 2019)

Ultra-Compact and Wideband V(U)HF 3-dB Power Dividers Consisting of Novel Asymmetric Impedance Transformers. - Hee-Ran Ahn; Manos M. Tentzeris (IEEE Access, 2019)

A Novel Compact Isolation Circuit Suitable for Ultracompact and Wideband Marchand Baluns. - Hee-Ran Ahn; Manos M. Tentzeris (IEEE Trans. Circuits Syst. II Express Briefs, 2020)