Juntaek Oh
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View article: Ultra-wide-field imaging Mueller matrix spectroscopic ellipsometry for semiconductor metrology
Ultra-wide-field imaging Mueller matrix spectroscopic ellipsometry for semiconductor metrology Open
We propose an ultra-wide-field imaging Mueller matrix spectroscopic ellipsometry (IMMSE) system for semiconductor metrology. The IMMSE system achieves large-area measurements with a 20 mm × 20 mm field of view (FOV)—the largest FOV reporte…
View article: Rectifier array with wide input power and frequency ranges using harmonic controllable impedance compression network
Rectifier array with wide input power and frequency ranges using harmonic controllable impedance compression network Open
This paper presents a rectifier array with a harmonic-controllable impedance compression network (HCICN) designed to achieve a high power conversion efficiency (PCE) across wide input power and frequency ranges. The HCICN of the proposed r…
View article: Fully Digital Phased Array Harmonic Radar for Detecting Concealed Electronic Devices
Fully Digital Phased Array Harmonic Radar for Detecting Concealed Electronic Devices Open
This paper presents the design and performance evaluation of a fully integrated digital phased array-based nonlinear radar system. The proposed system employs a bi-static structure, where the transmitter and receiver are physically separat…
View article: High‐Efficiency Millimeter‐Wave Scalable Rectenna Array With Individual Impedance Control
High‐Efficiency Millimeter‐Wave Scalable Rectenna Array With Individual Impedance Control Open
This study proposes a millimeter‐wave scalable rectenna array with individual fundamental and second harmonic impedance control to realize high‐efficiency wireless power transfer. The proposed rectenna array features a series arrangement o…
View article: High-Efficiency Dual-Band Rectifier with Extended Dynamic Frequency Ranges based on Independent Dual-Band Impedance Control
High-Efficiency Dual-Band Rectifier with Extended Dynamic Frequency Ranges based on Independent Dual-Band Impedance Control Open
This study presents a high-efficiency dual-band rectifier with an extended frequency range. The proposed rectifier comprises a voltage doubler with shunt capacitors and an independent dual-band impedance control network (IDICN). The propos…
View article: OOK Harmonic Rectifier-Modulator for Self-Aligning Wireless IoT Sensor Nodes With Uncompromised Efficiency
OOK Harmonic Rectifier-Modulator for Self-Aligning Wireless IoT Sensor Nodes With Uncompromised Efficiency Open
This paper presents a harmonic based on-off keying (OOK) rectifier-modulator (HRM) for energy efficient battery-less self-aligning wireless sensor nodes. The proposed HRM efficiently converts the incident fundamental power to DC and simult…
View article: Highly Efficient Dual-Band Rectifier Based on Symmetric Impedance Control Network
Highly Efficient Dual-Band Rectifier Based on Symmetric Impedance Control Network Open
This study proposes a dual-band rectifier that utilizes a symmetric impedance control network (SICN) for highly efficient wireless power transfer. The proposed rectifier comprises a voltage doubler and an SICN connected to each diode of th…
View article: Millimeter-Wave 2D Retrodirective Beamformer Based on Waveguide Rotman Lens
Millimeter-Wave 2D Retrodirective Beamformer Based on Waveguide Rotman Lens Open
Millimeter-wave (mmWave) technologies offer high directivity and narrow beamwidth with compact size, making them suitable for wireless power transfer (WPT). To support efficient beam steering, retrodirective operation is advantageous. Whil…
View article: A 9.2–18-GHz Sub-3.5-dB NF CMOS Low Noise Amplifier Using Current-Reuse Stacked Inverter With Inductive Series Peaking
A 9.2–18-GHz Sub-3.5-dB NF CMOS Low Noise Amplifier Using Current-Reuse Stacked Inverter With Inductive Series Peaking Open
In this paper, we introduce a novel wideband CMOS low noise amplifier (LNA) that employs a current-reuse stacked inverter (CRSI) in conjunction with advanced inductive peaking to significantly enhance noise performance and gain flatness ac…
View article: High Efficiency Class-F Rectifier Based on Harmonic-Controlled Voltage Doubler With Extended Input Power and Frequency Range
High Efficiency Class-F Rectifier Based on Harmonic-Controlled Voltage Doubler With Extended Input Power and Frequency Range Open
This paper presents a highly efficient class-F rectifier based on a harmonic-controlled voltage doubler (HCVD) structure. Previous studies on voltage doubler-based class-F rectifiers, have primarily configured the harmonic termination netw…
View article: Dual-Band Continuous Class-F<sup>−1</sup> Power Amplifier With Second-Harmonic Suppression for Harmonic Radar Systems
Dual-Band Continuous Class-F<sup>−1</sup> Power Amplifier With Second-Harmonic Suppression for Harmonic Radar Systems Open
In this study, a highly efficient harmonic suppressed dual-band power amplifier (PA) for harmonic radar systems is proposed. The proposed PA incorporates a harmonic-controlled dual-band matching network (HCDMN) comprising /4 open stubs at …
View article: Two-Tone Suppressed Third-Order Intermodulation Transponder Based on Transmission-Line-Based Fourth-Order Filter Combined Matching Network
Two-Tone Suppressed Third-Order Intermodulation Transponder Based on Transmission-Line-Based Fourth-Order Filter Combined Matching Network Open
This paper presents a -order intermodulation transponder designed to achieve high suppression of fundamental two-tone signals simultaneously. In previous papers, a nonlinear response system combining matching and suppression has never been…
View article: Harmonic Reflection Rectenna for Precise Wireless Power Transfer Antenna Alignment
Harmonic Reflection Rectenna for Precise Wireless Power Transfer Antenna Alignment Open
This study introduces a highly efficient harmonic reflection (HR) rectenna designed for precise wireless power transfer (WPT) antenna alignment. The proposed HR rectenna not only converts RF signals to DC power but also transmits a second-…
View article: A Compact Low-Loss Reflection-Type Harmonic Transponder for Battery-Less RFID Sensors Based on Harmonic Backscattering
A Compact Low-Loss Reflection-Type Harmonic Transponder for Battery-Less RFID Sensors Based on Harmonic Backscattering Open
This study presents a compact reflection-type harmonic transponder with a wide input power range for battery-less radio frequency identification (RFID) sensors based on harmonic backscattering. Miniaturizing the circuit size of conventiona…
View article: Overcoming Resolution Attenuation During Tilted Cryo-EM Data Collection
Overcoming Resolution Attenuation During Tilted Cryo-EM Data Collection Open
Structural biology efforts using cryogenic electron microscopy are frequently stifled by specimens adopting “preferred orientations” on grids, leading to anisotropic map resolution and impeding structure determination. Tilting the specimen…
View article: S-Band Wideband Harmonic Transponder with Wide Input Power Range
S-Band Wideband Harmonic Transponder with Wide Input Power Range Open
This paper presents a through-type harmonic transponder for S-band nonlinear radar. To increase the operating frequency range, a 2-stage L-shaped matching network was configured for the input and output matching networks. In previous studi…
View article: Harmonic Transponder Sensor Based on Independent Impedance Control for Motion Sensing
Harmonic Transponder Sensor Based on Independent Impedance Control for Motion Sensing Open
This paper presents the design and demonstration of a novel harmonic transponder sensor (HTS) that can measure the position and motion of a target in noisy and reflective indoor environments. In conventional HTS implementation, an impedanc…
View article: Design of 915 MHz Low-Loss Through-type Harmonic Transponder
Design of 915 MHz Low-Loss Through-type Harmonic Transponder Open
This paper presents a 915 MHz low-loss harmonic transponder for harmonic radar sensors. The proposed through-type harmonic transponder comprises an input and output matching network with an independent impedance control circuit. This contr…
View article: A High-Efficiency Multi-Mode Rectifier Array Based on Variable Power Distribution
A High-Efficiency Multi-Mode Rectifier Array Based on Variable Power Distribution Open
This study proposes a high-efficiency rectifier array with multiple power modes based on variable power distribution. The proposed rectifier array comprises of rectifier cell 1 for low-power mode, rectifier cell 2 for high-power mode, and …
View article: Ultra-Wideband Compact Rectifier Based on Coupled Transmission-Line Network
Ultra-Wideband Compact Rectifier Based on Coupled Transmission-Line Network Open
In this study, we propose the design and fabrication of a compact ultra-wideband high-efficiency rectifier based on a coupled transmission-line network. The proposed rectifier consists of a coupled transmission-line network and a voltage m…
View article: High-Efficiency Rectifier Based on Transmission-Line Transformer with Wide Input Power and Frequency Ranges
High-Efficiency Rectifier Based on Transmission-Line Transformer with Wide Input Power and Frequency Ranges Open
In this paper, a high-efficiency rectifier based on a transmission-line transformer with wide input power and frequency ranges is presented. The proposed rectifier was configured with a voltage multiplier and transmission lines connected t…
View article: Highly Efficient Rectifier Based on a Matched Voltage Doubler with Wide Input Power and Frequency Range
Highly Efficient Rectifier Based on a Matched Voltage Doubler with Wide Input Power and Frequency Range Open
This study presents a highly efficient rectifier based on a matched voltage doubler. The proposed matched voltage doubler consists of a voltage doubler and L-type impedance matching networks connected to each diode. The L-type impedance ma…
View article: Spatio-spectral decomposition of complex eigenmodes in subwavelength nanostructures through transmission matrix analysis
Spatio-spectral decomposition of complex eigenmodes in subwavelength nanostructures through transmission matrix analysis Open
Exploiting multiple near-field optical eigenmodes is an effective means of designing, engineering, and extending the functionalities of optical devices. However, the near-field optical eigenmodes of subwavelength plasmonic nanostructures a…
View article: S-Band GaN HEMT Power Amplifier Based on the Harmonic Control Matching Network
S-Band GaN HEMT Power Amplifier Based on the Harmonic Control Matching Network Open
This paper presents a high-efficiency power amplifier based on a harmonic control matching network. We proposed a harmonic control matching network based on a Chebyshev filter that can match the load to the optimum power matching impedance…
View article: A K-/Ka-Band CMOS Power Amplifier with a Matched Cascode Power Cell
A K-/Ka-Band CMOS Power Amplifier with a Matched Cascode Power Cell Open
This study proposes a K-/Ka-band CMOS power amplifier (PA) with a matched cascode power cell. Interstage inductors are introduced between the common source (CS) and common gate (CG) transistors to achieve high power gain and high reverse i…
View article: Highly Efficient Rectifier Array Using a Two-Section Branch-Line Coupler for Simultaneous Wireless Information and Power Transfer (SWIPT)
Highly Efficient Rectifier Array Using a Two-Section Branch-Line Coupler for Simultaneous Wireless Information and Power Transfer (SWIPT) Open
This study presents a rectifier array with a two-section branch-line coupler for simultaneous wireless information and power transfer (SWIPT). The branch-line coupler-based power recycling technique is introduced to combine two sub-rectifi…
View article: Measurements of 3-D morphology of individual red blood cells upon localized photothermal effects using gold nanorods
Measurements of 3-D morphology of individual red blood cells upon localized photothermal effects using gold nanorods Open
We investigated the in-situ photothermal response of human red blood cells (RBCs) by combining photothermal heat generation and 3-D quantitative phase imaging techniques. Gold-nanorod-coated substrates were excited using near-infrared ligh…