Sungjoon Lim
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View article: Ultra-Wideband Double-Pentagonal Fractal Antenna for C-, X-, Ku- and K-Band Wireless Applications
Ultra-Wideband Double-Pentagonal Fractal Antenna for C-, X-, Ku- and K-Band Wireless Applications Open
Fractal antennas employ self-similar geometries to generate scaled multiple resonances within compact structures, thereby achieving broadband performance. However, many reported designs remain constrained by narrow impedance bandwidths or …
View article: CT-derived proximal tibial bone density imbalance is associated with knee osteoarthritis
CT-derived proximal tibial bone density imbalance is associated with knee osteoarthritis Open
Knees with OA were associated with asymmetric remodeling patterns of the proximal tibia, including higher medial subchondral density and lower metaphyseal bone density, suggestive of a compartmental imbalance. CT-derived HU values, along w…
View article: Design and Fabrication of a Transparent Screen-Printed Decagonal Fractal Antenna Using Silver Nanoparticles
Design and Fabrication of a Transparent Screen-Printed Decagonal Fractal Antenna Using Silver Nanoparticles Open
This study presents a compact, wideband fractal antenna fabricated using silver nanoparticles (AgNPs) and screen-printing technology. The antenna consists of a decagonal monopole patch and a mesh ground plane, both printed on a transparent…
View article: Dynamically Adaptive Camouflage for Simultaneous Multispectral Stealth in Radar, Visible Light, and Infrared Light
Dynamically Adaptive Camouflage for Simultaneous Multispectral Stealth in Radar, Visible Light, and Infrared Light Open
Multispectral stealth is a critical technology for military and security applications. Conventional methods typically address stealth in only one or two spectral bands—radar, visible light, or infrared—thereby limiting their effectiveness …
View article: Transparent and printed RF electronics: a comprehensive review of materials, and applications
Transparent and printed RF electronics: a comprehensive review of materials, and applications Open
The development of transparent radio-frequency (RF) electronics has enabled the creation of flexible, lightweight devices with novel applications. A key driver of this advancement is printed electronic devices, which offer scalable and env…
View article: A Wideband Magneto-Electric (ME) Dipole Antenna Enabled by ME Resonance and Aperture-Coupled Excitation
A Wideband Magneto-Electric (ME) Dipole Antenna Enabled by ME Resonance and Aperture-Coupled Excitation Open
In this study, we propose a novel wideband aperture-coupled magneto-electric (ME) dipole antenna that achieves enhanced bandwidth by simultaneously leveraging ME resonance and aperture-coupled excitation. Building upon the conventional ME …
View article: Low-cost large-area 100 GHz intelligent reflective surface: electrically column control of screen-printable high phase changing ratio vanadium dioxides
Low-cost large-area 100 GHz intelligent reflective surface: electrically column control of screen-printable high phase changing ratio vanadium dioxides Open
In this paper, we propose for the first time 100 GHz intelligent reflective surface (IRS) using screen-printable, high phase changing ratio vanadium dioxide (VO 2 ). Sub-THz communications offer advantages such as ultra-high speed and ultr…
View article: 0-to-270° wide pattern reconfigurable antenna using 3D-Printed single quasi-yagi antenna with shape memory hinge
0-to-270° wide pattern reconfigurable antenna using 3D-Printed single quasi-yagi antenna with shape memory hinge Open
This study presents a 0-to-270° wide-pattern reconfigurable antenna incorporating a shape memory hinge. The substrate is 3D-printed using a shape memory polymer (SMP) and high-temperature filaments, with stretchable silver ink applied via …
View article: 3d-Printed Kirigami-Driven Deformable Frequency-Selective Surface with Frequency-Switchable Rejection and Angle-Sensitive Rejection
3d-Printed Kirigami-Driven Deformable Frequency-Selective Surface with Frequency-Switchable Rejection and Angle-Sensitive Rejection Open
View article: Screen-printing high/low resistance using only a single silver nanowire ink: Resistance-gradient metasurface application for broadband microwave absorption and optical transparency
Screen-printing high/low resistance using only a single silver nanowire ink: Resistance-gradient metasurface application for broadband microwave absorption and optical transparency Open
Transparent metasurface absorbers are highly sought after for their diverse applications, but achieving broad absorption bandwidths without sacrificing optical transparency remains a challenge. Traditionally, enhancing absorption involves …
View article: 4D-printed intelligent reflecting surface with improved beam resolution via both phase modulation and space modulation
4D-printed intelligent reflecting surface with improved beam resolution via both phase modulation and space modulation Open
View article: Poster: ElectromagneticWave Control with Next-Generation Reconfigurable Intelligent Surface (RIS)
Poster: ElectromagneticWave Control with Next-Generation Reconfigurable Intelligent Surface (RIS) Open
Reconfigurable Intelligent Surface (RIS) is a promising technology for enhancing wireless networks in challenging environments. While existing RIS designs can manipulate basic electromagnetic properties like amplitude and phase, it lacks c…
View article: Frequency- and bandwidth-controllable electromagnetic absorber using 3D-printed shape memory meta-wires
Frequency- and bandwidth-controllable electromagnetic absorber using 3D-printed shape memory meta-wires Open
A metamaterial can be used for fabricating an electromagnetic absorber by tailoring its effective permittivity and permeability. In general, a metamaterial absorber works at a specific resonant frequency, and its absorption frequency does …
View article: Screen-Printed Metamaterial Absorber Using Fractal Metal Mesh for Optical Transparency and Flexibility
Screen-Printed Metamaterial Absorber Using Fractal Metal Mesh for Optical Transparency and Flexibility Open
In stealth applications, there is a growing emphasis on the development of radar-absorbing structures that are efficient, flexible, and optically transparent. This study proposes a screen-printed metamaterial absorber (MMA) on polyethylene…
View article: Reconfigurable transmissive metasurface with a combination of scissor and rotation actuators for independently controlling beam scanning and polarization conversion
Reconfigurable transmissive metasurface with a combination of scissor and rotation actuators for independently controlling beam scanning and polarization conversion Open
Polarization conversion and beam scanning metasurfaces are commonly used to reduce polarization mismatch and direct electromagnetic waves in a specific direction to improve the strength of a wireless signal. However, identifying suitable a…
View article: Optically Transparent Dual-Band Metamaterial Absorber Using Ag Nanowire Screen-Printed Second-Order Cross-Fractal Structures
Optically Transparent Dual-Band Metamaterial Absorber Using Ag Nanowire Screen-Printed Second-Order Cross-Fractal Structures Open
In this paper, we propose an optically transparent dual-band metamaterial absorber (MMA) that uses Ag nanowire screen-printed fractal structures. The proposed MMA exhibits near-perfect absorption in the C- and K-bands. This dual-band absor…
View article: Miniaturization and Bandwidth Enhancement of Fractal-Structured Two-Arm Sinuous Antenna Using Gap Loading with Meandering
Miniaturization and Bandwidth Enhancement of Fractal-Structured Two-Arm Sinuous Antenna Using Gap Loading with Meandering Open
A sinuous antenna is a frequency-independent antenna known for its wide bandwidth and consistent gain, which makes it valuable in broadband applications such as ultrawideband (UWB) radar and ground-penetrating radar (GPR). However, sinuous…
View article: A Low-Cost Microfluidic and Optically Transparent Water Antenna with Frequency-Tuning Characteristics
A Low-Cost Microfluidic and Optically Transparent Water Antenna with Frequency-Tuning Characteristics Open
In this study, a novel microfluidic frequency reconfigurable and optically transparent water antenna is designed using three-dimensional (3D) printing technology. The proposed antenna consists of three distinct parts, including a circularl…
View article: Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability (Advanced Optical Materials 14/2023)
Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability (Advanced Optical Materials 14/2023) Open
Technological advancements rely heavily on the development of electrically tuneable metasurfaces that have the capability of completely controlling electromagnetic wave parameters. In article number 2202943, Sungjoon Lim and colleagues int…
View article: 1-Bit Transmission-Type Digital Programmable Coding Metasurface with Multi-Functional Beam-Shaping Capability for Ka-Band Applications
1-Bit Transmission-Type Digital Programmable Coding Metasurface with Multi-Functional Beam-Shaping Capability for Ka-Band Applications Open
Digital programmable coding metasurfaces (DPCMs) have recently attracted enormous attention and have been broadly applied, owing to their ability to manipulate electromagnetic (EM) wave behaviours and programmable multi-functionality. Rece…
View article: Foldable RF Energy Harvesting System Based on Vertically Layered Metal Electrodes within a Single Sheet of Paper (Adv. Mater. 20/2023)
Foldable RF Energy Harvesting System Based on Vertically Layered Metal Electrodes within a Single Sheet of Paper (Adv. Mater. 20/2023) Open
Radio-Frequency Energy Harvesting In article number 2300197, Suk Tai Chang, Sungjoon Lim, and co-workers report that a foldable radio-frequency (RF) energy-harvesting system (RFEH) can be realized by integrating an RF antenna, RF to direct…
View article: Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability
Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability Open
The capability to dynamically modulate electromagnetic wavefronts can revolutionize and be crucial for future wireless technology. Electromagnetic waves can be fundamentally described in terms of amplitude, phase, polarization, and angular…
View article: Microwave Dual-Crack Sensor with a High Q-Factor Using the TE20 Resonance of a Complementary Split-Ring Resonator on a Substrate-Integrated Waveguide
Microwave Dual-Crack Sensor with a High Q-Factor Using the TE20 Resonance of a Complementary Split-Ring Resonator on a Substrate-Integrated Waveguide Open
Microwave sensors have attracted interest as non-destructive metal crack detection (MCD) devices due to their low cost, simple fabrication, potential miniaturization, noncontact nature, and capability for remote detection. However, the dev…
View article: An Overview of Novel Tuning Techniques for Realizing Programmable Beam-Scanning Metasurfaces
An Overview of Novel Tuning Techniques for Realizing Programmable Beam-Scanning Metasurfaces Open
Programmable metasurfaces are two-dimensional artificial subwavelength thin-layer structures with programmable electromagnetic properties that can operate over a wide frequency range.Controlling the tunable components of these subwavelengt…
View article: Thermal spiral inductor using 3D printed shape memory kirigami
Thermal spiral inductor using 3D printed shape memory kirigami Open
View article: Mechatronic Reconfigurable Intelligent‐Surface‐Driven Indoor Fifth‐Generation Wireless Communication
Mechatronic Reconfigurable Intelligent‐Surface‐Driven Indoor Fifth‐Generation Wireless Communication Open
Reconfigurable intelligent surface‐assisted wireless networks have been proposed to overcome the current technical issues in fifth‐generation (5G) wireless communication systems. Generally, the beam control functions of a reconfigurable in…
View article: Rotational Kirigami Tessellation Metasurface for Tunable Chirality (Adv. Mater. Technol. 10/2022)
Rotational Kirigami Tessellation Metasurface for Tunable Chirality (Adv. Mater. Technol. 10/2022) Open
Tessellation Metasurface In article number 2101706, Sungjoon Lim and co-workers present a 3D-printing-based rotational kirigami tessellation metasurface with a 2D-to-2D in-plane transformation feature. The proposed rotational kirigami meta…
View article: Lightweight 3D-Printed Fractal Gradient-Index Lens Antenna with Stable Gain Performance
Lightweight 3D-Printed Fractal Gradient-Index Lens Antenna with Stable Gain Performance Open
This paper proposes a millimeter-wave lens antenna using 3-dimensional (3D) printing technology to reduce weight and provide stable gain performance. The antenna consists of a four-layer cylindrical gradient-index (GRIN) lens fed by a wide…
View article: Design and Fabrication of Millimeter-Wave Frequency-Tunable Metamaterial Absorber Using MEMS Cantilever Actuators
Design and Fabrication of Millimeter-Wave Frequency-Tunable Metamaterial Absorber Using MEMS Cantilever Actuators Open
In this paper, a MEMS (Micro Electro Mechanical Systems)-based frequency-tunable metamaterial absorber for millimeter-wave application was demonstrated. To achieve the resonant-frequency tunability of the absorber, the unit cell of the pro…
View article: Hydrodynamic metasurface for programming electromagnetic beam scanning on the Azimuth and elevation planes
Hydrodynamic metasurface for programming electromagnetic beam scanning on the Azimuth and elevation planes Open
The development of multifunctional and reconfigurable metasurfaces capable of manipulating electromagnetic waves has created new opportunities for various exciting applications. Extensive efforts have been applied to exploiting active meta…