Yongduk Oh

College of Engineering

Works (7)

Updated: October 24th, 2025 05:03

2025 article

Analysis and Correction of Focal Plane Distortion in Flattened Luneburg Lenses

Askari, H., Oh, Y., & Adams, J. (2025, August 25). IEEE Antennas and Wireless Propagation Letters, Vol. 24, pp. 3719–3723.

By: H. Askari n, Y. Oh n & J. Adams n 

author keywords: Lenses; Feeds; Permittivity; Distortion; Beam steering; Boundary conditions; Shape; Training; Surface waves; Optical surface waves; focal plane distortion; Gutman lens; Luneburg lens; planar feeding; quasi-conformal transformation
topics (OpenAlex): Optical Coatings and Gratings; Advanced optical system design; Adaptive optics and wavefront sensing
Sources: Web Of Science, NC State University Libraries, ORCID
Added: October 21, 2025

2024 article

Distortion of Focal Plane in Flattened 2D Luneburg Lens

Oh, Y., Askari, H., & Adams, J. (2024, July 14). 2024 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION AND INC/USNCURSI RADIO SCIENCE MEETING, AP-S/INC-USNC-URSI 2024, pp. 2109–2110.

By: Y. Oh n, H. Askari n & J. Adams n 

topics (OpenAlex): Optical Coatings and Gratings; Optical measurement and interference techniques; Advanced optical system design
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Sources: Web Of Science, NC State University Libraries
Added: February 24, 2025

2022 article

Low Profile GRIN Lenses With Integrated Matching Using 3-D Printed Ceramic

Oh, Y., Kordsmeier, N., Askari, H., & Adams, J. J. (2022, December 8). IEEE Open Journal of Antennas and Propagation, Vol. 4, pp. 12–22.

By: Y. Oh n, N. Kordsmeier n, H. Askari n & J. Adams n 

author keywords: Lenses; Permittivity; Apertures; Horn antennas; Ceramics; Three-dimensional displays; Reflection; Horn; GRIN lens; high permittivity ceramic; quarter wavelength matching; tapered matching; unit cells; 3D print
topics (OpenAlex): Microwave Engineering and Waveguides; Antenna Design and Analysis; Advanced Antenna and Metasurface Technologies
TL;DR: This paper investigates a shortened horn antenna with high gain that is enabled by a 3D-printed gradient index (GRIN) lens composed of high permittivity zirconia and results show good agreement with simulations, including gain performance equivalent to a horn of 2.4x longer length. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries, ORCID
Added: March 13, 2023

2021 article

Implementation of A Flat-Bottom Luneburg Lens Based on Conformal Transformation Optics

Yang, B., Oh, Y., Hu, X., & Adams, J. J. (2021, June 7). 2021 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS).

By: B. Yang *, Y. Oh n, X. Hu* & J. Adams n 

author keywords: transformation optics; numerical conformal mapping; Luneburg lens; unit cell
topics (OpenAlex): Optical Coatings and Gratings; Metamaterials and Metasurfaces Applications; Liquid Crystal Research Advancements
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Sources: Web Of Science, NC State University Libraries
Added: October 11, 2022

2021 article

Unit cell estimation of volumetrically-varying permittivity in additively-manufactured ceramic lattices with X-ray computed tomography

Burden, E., Oh, Y., Mummareddy, B., Negro, D., Cortes, P., Plessis, A. D., … Rojas, R. (2021, August 8). Materials & Design, Vol. 11.

By: E. Burden *, Y. Oh n, B. Mummareddy *, D. Negro*, P. Cortes *, A. Plessis *, E. MacDonald *, J. Adams n , F. Li *, R. Rojas *

author keywords: Additive Manufacturing; Functionally Graded Lattices; Ceramics; Zirconia; Nano-particle Jetting; Material Jetting; X-ray tomography
topics (OpenAlex): Ferroelectric and Piezoelectric Materials; Microwave Imaging and Scattering Analysis; Microwave Dielectric Ceramics Synthesis
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Sources: Web Of Science, NC State University Libraries, ORCID
Added: November 8, 2021

2020 article

3D Printed Zirconia for UWB Stacked Conical Ring DRA

Bharambe, V. T., Oh, Y., Adams, J. J., Negro, D., & MacDonald, E. (2020, July 5). 2020 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION AND NORTH AMERICAN RADIO SCIENCE MEETING.

By: V. Bharambe n , Y. Oh n, J. Adams n , D. Negro* & E. MacDonald *

author keywords: 3D Printing; zirconia; Dielectric Resonator Antenna; UWB antenna
topics (OpenAlex): Microwave Engineering and Waveguides; Antenna Design and Analysis; Advanced Antenna and Metasurface Technologies
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Sources: Web Of Science, NC State University Libraries
Added: June 28, 2021

2020 article

Design of a 3D Printed Gradient Index Lens Using High Permittivity Ceramic

Oh, Y., Bharambe, V. T., Adams, J. J., Negro, D., & MacDonald, E. (2020, July 5). 2020 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION AND NORTH AMERICAN RADIO SCIENCE MEETING.

By: Y. Oh n, V. Bharambe n , J. Adams n , D. Negro n & E. MacDonald *

author keywords: 3D printing; zirconia; high dielectric constant; effective permittivity; GRIN lens
topics (OpenAlex): Advanced Antenna and Metasurface Technologies; Metamaterials and Metasurfaces Applications; Microwave Engineering and Waveguides
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Sources: Web Of Science, NC State University Libraries
Added: June 28, 2021

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