Search Results - "NAM, Sangwook"

Fundamental Aspects of Near-Field Coupling Small Antennas for Wireless Power Transfer by LEE, Jaechun, NAM, Sangwook

“…A physical limitation on the power transfer efficiency between two electrically small antennas in the near-field range is presented. By using a Z-parameter…”
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A Dual-Polarized 1-D Tightly Coupled Dipole Array Antenna by Lee, Hakjune, Nam, Sangwook

“…A dual-polarized 1-D tightly coupled dipole array (TCDA) antenna is proposed in this paper. To apply the TCDA design concept to a 1-D array, we place a…”
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Hybrid Beamfocusing Architecture and Algorithm for Microwave Wireless Power Transmission Systems by Kim, Ho Yeol, Nam, Sangwook

“…This study investigates a hybrid beamfocusing method for microwave wireless power transmission (MPT). We propose an optimization algorithm to obtain an optimal…”
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Investigation of Adaptive Matching Methods for Near-Field Wireless Power Transfer by PARK, Jongmin, TAK, Youndo, KIM, Yoongoo, KIM, Youngwook, NAM, Sangwook

“…Adaptive matching methods for a wireless power transfer system in the near-field region are investigated. The impedance and resonant frequency characteristic…”
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Frequency Reconfigurable Beam Scanning Squarely Modulated Reactance Surface Antenna With Period and Surface Reactance Control by Yang, Doohyun, Nam, Sangwook

“…In this study, a novel antenna design is proposed for designing a frequency-reconfigurable wide-angle beam scanning antenna and applied to a squarely modulated…”
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Wideband and Low-Profile Array of Tightly Coupled Dipole Subarrays by Kim, Seongjung, Nam, Sangwook

“…This letter introduces a novel wideband, low profile, tightly coupled dipole subarray for wireless communication systems. The proposed subarray, composed of 3…”
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Design of Power Dividers for Finite Dipole Subarrays with Complex Impedances by Kim, Seongjung, Nam, Sangwook

“…In this study, we propose a method for designing a feeding network for all port-matched and high gain dipole subarray antennas excited by uniform current mode…”
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A Novel Reflection-Type Polarization Convertor Design Using Connected Orthogonal Tightly Coupled Dipole Arrays by Kim, Seongjung, Nam, Sangwook

“…Herein, we design a polarization convertor (PC) using two orthogonally polarized, tightly coupled dipole arrays (TCDAs) connected in cascade, of which one is…”
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Compact Microstrip 3-dB Coupled-Line Ring and Branch-Line Hybrids With New Symmetric Equivalent Circuits by AHN, Hee-Ran, NAM, Sangwook

“…New symmetric equivalent circuits are suggested for 90° and 270° transmission-line sections, with which compact coupled-line ring and branch-line hybrids can…”
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Design of a Relocatable Antenna Element Module for a Ku-Band Reconfigurable Array with Low Mutual Coupling by Kim, Seongjung, Nam, Sangwook

“…In this study, a modular array antenna with low mutual coupling is proposed for operation in a Ku-band (12–18 GHz) reconfigurable array, which consists of a…”
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Mode-Based Analysis of Resonant Characteristics for Near-Field Coupled Small Antennas by Youndo Tak, Youndo Tak, Jongmin Park, Jongmin Park, Sangwook Nam, Sangwook Nam

“…This letter proposes a new approach for estimating resonant characteristics of near-field coupled small antennas. It is based on the equivalent circuit…”
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Wideband Microstrip Coupled-Line Ring Hybrids for High Power-Division Ratios by AHN, Hee-Ran, SANGWOOK NAM

“…Wideband coupled-line ring hybrids are presented for high power-division ratios. For this, an equivalent circuit to make the characteristic impedance of a…”
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Bandwidth Enhancement of Cavity-Backed Slot Antenna Using a Via-Hole Above the Slot by Sumin Yun, Dong-Yeon Kim, Sangwook Nam

“…A novel technique for the bandwidth enhancement of a cavity-backed slot antenna is presented. A via-hole located above the slot creates an additional resonance…”
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New Design Formulas for Impedance-Transforming 3-dB Marchand Baluns by AHN, Hee-Ran, NAM, Sangwook

“…New design formulas for impedance-transforming 3-dB Marchand baluns are proposed. They are about the even- and odd-mode impedances of the coupled…”
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A Wideband Spiral Antenna for Ingestible Capsule Endoscope Systems: Experimental Results in a Human Phantom and a Pig by Lee, Sang Heun, Lee, Jaebok, Yoon, Young Joong, Park, Sangbok, Cheon, Changyul, Kim, Kihyun, Nam, Sangwook

“…This paper presents the design of a wideband spiral antenna for ingestible capsule endoscope systems and a comparison between the experimental results in a…”
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A Two-Stage Broadband Fully Integrated CMOS Linear Power Amplifier for LTE Applications by Kim, Kihyun, Ko, Jaeyong, Lee, Sungho, Nam, Sangwook

“…This brief presents the implementation and measurement results of a CMOS broadband linear power amplifier (PA) for long-term evolution (LTE) applications…”
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High-Efficiency W-Band Electroforming Slot Array Antenna by Kim, Dong-yeon, Lim, Youngjoon, Yoon, Hee-Sung, Nam, Sangwook

“…A W-band 8 × 8 slot array antenna is proposed and fabricated by electroforming for high-precision manufacturing. The external mutual coupling between radiating…”
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Efficiency Bound Estimation for a Practical Microwave and mmWave Wireless Power Transfer System Design by Kim, Ho Yeol, Lee, Youngseok, Nam, Sangwook

“…In this study, we present an efficient method to find the power transfer efficiency (PTE) bound for practical microwave and mmWave wireless power transfer…”
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Outer-Wall Loop Antenna for Ultrawideband Capsule Endoscope System by Yun, Sumin, Kim, Kihyun, Nam, Sangwook

“…The capsule endoscopy system has been used to obtain an image from the inside of the human digestive tract. To acquire high-resolution images, a loop antenna…”
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3-dB Power Dividers With Equal Complex Termination Impedances and Design Methods for Controlling Isolation Circuits by Ahn, Hee-Ran, Nam, Sangwook

“…A 3-dB power divider (PD) terminated in equal complex impedances is presented. It consists of two identical 90 ° transmission-line sections and an isolation…”
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