Electromagnetics · Materials · Devices

Junseok (Justin) Ma, Ph.D.

Staff Engineer (CL3), RF/Antenna Engineering

Advanced Antenna Lab · Mobile eXperience (MX) Division · Samsung Electronics, Suwon

I work where electromagnetics, materials and devices meet — from AI-assisted antenna design for next-generation mobile devices, to liquid-crystal RF components, printed optoelectronics and programmable surfaces across microwave, mmWave and optical bands.

Portrait of Junseok (Justin) Ma Now at Samsung Electronics
24
Peer-reviewed journal articles
+4 under review
12
Conference presentations
International & domestic
1
Patent application
Korea · 2026
11
Honors, fellowships & awards
2018 — 2026
12
Manuscripts reviewed
for 9 journals

Build technology that matters —
and rise by lifting others.

I want my work to leave a positive mark beyond the lab, and to grow by helping the people around me grow. If that resonates, I’d love to hear from you.

01

Research

From molecular-level material design to antennas in real devices.

Full research overview →

My work turns liquid crystals from display materials into field-programmable media for electronics and photonics, and now applies that electromagnetic intuition — together with AI/ML — to antenna engineering for mobile platforms.

Functional materials for smart electronics. Adaptive materials and scalable processes, carried through to reconfigurable electronic and photonic devices.
From molecules to systems How the threads of my work connect
  1. 01

    Materials

    Liquid-crystal mixtures and composites engineered for low loss and strong tunability.

    Low-loss RF LC mixture, JNC
  2. 02

    Fabrication

    Drop-on-demand printing, laser and hybrid patterning, and surface alignment.

    mm-to-µm patterning, Small Methods
  3. 03

    Devices

    Tunable filters, phase shifters and intelligent surfaces; smart windows and displays.

    Frontispiece, Adv. Mater.
  4. 04 · now

    Systems

    Antennas for next-generation mobile devices: mmWave, UWB and satellite links.

    Samsung Electronics MX
Across the spectrum
Current work · mobile antennas
1 2 3 4
1 GHz10 GHz100 GHz1 THz100 THz1 PHz
  • 1~10 GHz · tunable LC filters
  • 228 GHz · LC phase shifters, 5G & satellite LC materials
  • 3D-band (110–170 GHz) · LC intelligent surfaces for 6G
  • 4Visible (400–700 nm) · smart windows, reflective displays, AR optics
POSTECH 2016–2025 Oxford 2023–2024 KAIST 2025–2026 Samsung Electronics 2026–
2020 — 2026

Liquid Crystals for Microwave & mmWave

Tunable phase shifters, filters, phased arrays and reconfigurable intelligent surfaces built on LC dielectrics — targeting low loss, fast switching and beam control for 5G, satellite and 6G.

ResultLC mixture ZOC-A019XX commercialized with JNC (tan δ ≈ 0.006, tunability ≈ 0.33 @ 28 GHz)
2023 — 2026

Printed LC Optoelectronics

Drop-on-demand printing of LC droplets and pixels for smart windows, reflective displays and AR optics — controlling transparency, color and polarization with minimal material and power.

ResultImage-integrated electrochromic PDLC smart windows — Adv. Opt. Mater., Hot Topic
2023 — 2026

Reconfigurable Photonics & Patterning

Laser-assisted and hybrid patterning from millimeters to microns, and topological LC structures, toward programmable metasurfaces and adaptive photonic hardware.

ResultMetastable topological domains locked in Pi cells — Adv. Funct. Mater., Editor’s Choice
02

Experience

Industry, postdoctoral and international research.

  1. Sep 2026 — Present
    Samsung ElectronicsSuwon, Republic of Korea
    Staff Engineer (CL3), RF/Antenna Engineering
    Advanced Antenna Lab · Mobile eXperience (MX) Division
    • Antenna technologies for next-generation smartphones and emerging form-factor devices.
    • Antenna solutions across mmWave, UWB and satellite connectivity, from EM simulation to prototyping, measurement and system-level analysis.
    • AI/ML-assisted design-space exploration, performance prediction and design optimization.
  2. Sep 2025 — Aug 2026
    KAISTDaejeon, Republic of Korea
    Jang Young-Sil Postdoctoral Research Fellow
    Natural Sciences Research Institute · Soft Material Assembly Group
    6G Core Technology Development Program
    IITP, Korea

    Fast-switching liquid-crystal antennas for reconfigurable intelligent surfaces (RIS) in next-generation wireless systems.

    Lightweight LC-based mmWave Beamforming Antenna System
    Agency for Defense Development (ADD) · Dec 2021 — Nov 2026 · KRW 6.718B

    Multi-purpose, lightweight LC beamforming antennas for next-generation communication and radar on mobile platforms.

  3. Dec 2023 — Dec 2024
    University of OxfordOxford, United Kingdom
    Recognised Student, Department of Engineering Science
    • Led the drop-on-demand printing project for smart windows: electrochromic LC systems with independently controllable color and transmittance.
    • Explored printed LC antenna and phased-array concepts using advanced materials (push-pull azo, blue-phase LC).
  4. 2016 — 2025
    POSTECHPohang, Republic of Korea
    B.S., M.S. and Ph.D., Electrical Engineering
    Project Lead — LC Printing for Smart Devices
    Feb 2025 — Present

    High-resolution, full-color smart windows using banking structures for precise patterning; extending printed LC to RF and optoelectronic devices.

    Samsung Science & Technology Foundation — CORE: Sub-THz 6G
    Sep 2021 — Sep 2024

    LC characterization and fabrication for D-band RIS, and tunable microwave/mmWave components for 6G.

    LC-based RF Applications & Commercialization — JNC Corporation, Japan
    Sep 2020 — Aug 2024

    Developed LC composites for 5G and satellite communications; commercialized mixtures including ZOC-A019XX. Corporate disclosure

  5. Jun 2018 — Aug 2018
    LG DisplayMagok, Seoul, Republic of Korea
    Intern, Preliminary Research Team for OLED
    Research on advanced LCD/OLED technologies and process-efficiency proposals.
03

Education

Electrical Engineering, POSTECH.

2022 — 2025
Ph.D.
POSTECH, Electrical Engineering
Dissertation: multifunctional reconfigurable LC devices using drop-on-demand printing
2020 — 2022
M.S.
POSTECH, Electrical Engineering
Thesis: LC-based mmWave phase shifters using display mass-production technology
2016 — 2020
B.S.
POSTECH, Electrical Engineering
Kim Jong-Han Foundation Scholar
05

Talks & Service

Invited talks and peer review.

“Liquid Crystal Engineering: From Molecular Alignment to Advanced Devices”

Invited talk · Chungnam National University (CNU) · Host: Prof. Jun-Hee Na, Dept. of Electrical, Electronics and Communication Engineering Education

Functional LC mixtures, DoD printing, and microwave/mmWave applications.

Apr 22, 2026
Journal reviewer
Light: Science & Applications Nature Advanced Optical Materials Wiley ×2 J. Phys. D: Applied Physics IOP Engineering Research Express IOP ×2 Liquid Crystals T&F ×2 Dyes and Pigments Elsevier Microwave & Optical Tech. Letters Wiley Photonics MDPI Electronics MDPI
06

Honors & Awards

Scholarships, fellowships and prizes.

  • Kim Beom-Man Best Ph.D. Dissertation AwardDepartmental top award · Dept. of Electrical Engineering, POSTECH2026
  • Jang Young-Sil Postdoctoral FellowshipKAIST / National Research Foundation of Korea2026
  • BK21 FOUR Outstanding Graduate Student Award (Overseas Research)NRF & Ministry of Education · top 14 awardees nationwide2025
  • POSTECHIAN FellowshipPOSTECH2024
  • Excellence Award (2nd Prize)EE Dept. Outstanding Performance Contest, POSTECH2024
  • Excellent Paper Challenge PrizePOSTECH Best Paper Competition2024
  • Grand Prize, 8th Electromagnetic Wave Measurement Thesis ContestKIEES2023
  • Samsung Electronics MX Division SponsorshipAntenna Prior Research Organization2023
  • BK21 FOUR Outstanding Graduate Student International FundingUniversity of Oxford research visit2023
  • BK21 Interdisciplinary Research Group Support FundingPOSTECH2023
  • Kim Jong-Han Foundation ScholarshipUndergraduate scholarship2018 — 2019