Jinyoung Choi

● Publications

Dissertation (1)

1.  Jinyoung Choi, "Design and Realization of Liquid-Crystal-Based Reconfigurable Connector-Fed RF Bandpass Filters", PhD thesis, 2026, Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Korea.

Journal Papers (12)

1. J.-Y. Choi, J.-S. Ma, and W.-S. Kim*, "Tunable High-Selectivity Wideband Bandpass Filter Using Triple-Mode Stub-Loaded Resonators Based on Liquid Crystals", IEEE Access (2025).

2. J.-S. Ma, W. Kamal*, A. Pradeep, A. J. Orr, S.-W. Oh, J.-Y. Choi, J. Guo, B. Mee, H.-W. Oh, J.-H. Lee, A. A. Castrejon-Pita*, S. J. Elston*, S. M. Morris*, and W.-S. Kim*, "Advanced Image-Integrated Smart Windows using Printed Electrochromic Polymer-Dispersed Liquid Crystal Droplets", Adv. Opt. Mater. (2025). 

3. J.-S. Ma, A. Pradeep, S.-W. Oh, J.-H. Lee, J.-Y. Choi, S.-O. Cha, H.-W. Oh, and W.-S. Kim*, "Operating temperature regulation in push-pull azobenzene-doped liquid crystal light-driven devices using UV absorber", Dyes Pigm. (2025).

4. J.-Y. Choi, J.-S. Ma, and W.-S. Kim*, "Reconfigurable Wideband Bandpass Filter Using Stepped Impedance Resonator Based on Liquid Crystals", Electronics (2025)

5. J.-Y. Choi, J.-S. Ma, H. Oh, and W.-S. Kim*, “Reconfigurable Narrow-Band Bandpass Filter Using Electrically-Coupled Open-Loop Resonators Based on Liquid Crystals”, J. Phys. D: Appl. Phys. (2024).

6. D. Kim, J. Choi, Y. Youn, S. Chang, C. Lee, W. Kim, and W. Hong*, "Characterization of Nematic Liquid Crystal Dielectric Properties using Complementary FSS featuring Electrically Small Cell Gaps across a wide Sub-THz Range", IEEE Trans. Antennas Propag. (2023)

7. J. Ma, J. Choi, S. Park, I. Kong, D. Kim, C. Lee, Y. Youn, M. Hwang, S. Oh*, W. Hong*­­­­, and W. Kim*, “Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter-wave Applications: Recent Progress for Next-generation Communication",  Adv. Mater. (2023)  

8. H. Shin†, J. Ma†, J. Choi†, and W. Kim*, "Phase Shifting Enhancement of a Substrate-Integrated Waveguide Phase Shifter based on Liquid Crystal", Appl. Sci. (2023). (+  Authors contributed equally to this work.)

9. J. Ma, J. Choi, H. Shin, J. Lee, S. Oh*, and W. Kim*, "An evaluation of Surface-Active Agent Hexadecyltrimethylammonium Bromide with Vertical Self-Alignment Properties to Align Liquid Crystals for Various Cell Gap Conditions",  Appl. Sci. (2022).

10. J. Kim, S.-W. Oh, J. Choi, S. Park, and W. Kim*, "Optical See-Through Head-Mounted Display including Transmittance Variable Display for High Visibility", J. Inf, Disp. (2022).

11. J. Ma, J. Choi, S. Oh, and W. Kim*, "Liquid-Crystal-Based Floating-Electrode-Free Coplanar Waveguide Phase Shifter with an Additional Liquid-Crystal Layer for 28-GHz Applications", J. Phys. D: Appl. Phys. (2021).

12. J. Ma, J. Choi, and W. Kim*, "액정의 고주파 대역 특성과 RF 응용 기술 동향", 인포메이션 디스플레이 제22권 제3호 (2021).

International Conference Papers (7)

1. H. Oh, S. Park, J. Choi, J. Ma, S. Choi, W. Kim*. "Analysis of Meander Delay Line Liquid Crystal Phase Shifter using Director Angle Extraction", IMID, KOREA, Aug.20-23, 2024 (2024).

2. J. Choi, J. Ma, H. Oh, and W. Kim*, "Characterization of Nematic Liquid Crystals at 10 GHz using an Open Stub Resonator", AP-S/URSI 2024 (2024).

3. J. Choi, J. Ma, H. Shin, and W. Kim*,"Reconfigurable Phased Array Antenna Based on Liquid Crystal With Miniaturized Bandpass Filter", ISAP, Oct.31-Nov.3, 2022 (2022).

4. H. Shin, J. Choi, J. Ma, and W. Kim*, "Phase Shift Enhancement of Substrate Integrated Waveguide Phase Shifter Using Liquid Crystal", IMID, KOREA, Aug.23-26, 2022 (2022).

5. J.-S. Ma, J.-Y. Choi, H.-J. Shin, and W.-S. Kim, "Comparative Analysis of Liquid-Crystal Driving between the Grounded-Coplanar Waveguide and the Floating-Electrode-Free Coplanar Waveguide in Liquid-Crystal Phase Shifters", AP-S/URSI 2022 (2022).

6. J. Choi and W. Kim*, "Comparison of Figure-of-Merit Efficiency in Liquid Crystal Phase Shifter Operating Modes: Electrically Controlled Birefringence vs. In-Plane Switching", IMID, KOREA, Aug. 25-27, 2021 (2021).

7. S. Park, J. Choi and W. Kim*, "Estimation of beads distribution inside an electroactive photonic crystal system", IMID, KOREA, Aug. 25-28, 2020 (2020).

Domestic Conference Papers (3)

1. J Ma, S. Oh, J. Choi, H. Oh, S. M. Morris*, and W. Kim*, "Enhancing Light-driven Polymer Stabilized Liquid Crystal Smart Devices",  The British Liquid Crystal Society: BLCS (2024).

2. J. Choi, J. Ma, H. Oh and W. Kim*, "Characterization of Nematic Liquid Crystal at 10 GHz using Director Angle Extraction", Korea Liquid Crystal Conference, 2024.

3. J. Choi, J. Ma, S. Park, and W. Kim*, "전기적 커플링 오픈 스터브를 이용한 소형 액정 기반 가변 광대역 대역저지 필터", IEIE, 2023. 

● Awards

1. Grand Prize, The 8th Electromagnetic Wave Measurement Thesis Contest, The Korean Institute of Electromagnetic Engineering and Science, Republic of Korea (2023).