Keum Cheol Hwang

Best Publications

• Triple-Band Unidirectional Circularly Polarized Hexagonal Slot Antenna With Multiple L-Shaped Slits

  Unknown

  100
  Citations

• A Design of a 92.4% Efficiency Triple Mode Control DC–DC Buck Converter With Low Power Retention Mode and Adaptive Zero Current Detector for IoT/Wearable Applications

  Young-Jun Park;Ju-Hyun Park;Hong-Jin Kim;Hocheol Ryu

  93
  Citations

• A Design of a Wireless Power Receiving Unit With a High-Efficiency 6.78-MHz Active Rectifier Using Shared DLLs for Magnetic-Resonant A4 WP Applications

  Hyung-Gu Park;Jae-Hyeong Jang;Hong-Jin Kim;Young-Jun Park

  85
  Citations

• Octave Bandwidth Doherty Power Amplifier Using Multiple Resonance Circuit for the Peaking Amplifier

  Hyunuk Kang;Hwiseob Lee;Wooseok Lee;Hansik Oh

  83
  Citations

• Circularly Polarized Spidron Fractal Dielectric Resonator Antenna

  Amir Altaf;Youngoo Yang;Kang-Yoon Lee;Keum Cheol Hwang

  78
  Citations

• Design of a High Efficiency DC–DC Buck Converter With Two-Step Digital PWM and Low Power Self-Tracking Zero Current Detector for IoT Applications

  Sang-Yun Kim;Young-Jun Park;Imran Ali;Truong Thi Kim Nga

  70
  Citations

• A Sidelobe-Reduced, Four-Beam Array Antenna Fed by a Modified $4 imes4$ Butler Matrix for 5G Applications

  Son Trinh-Van;Jong Min Lee;Youngoo Yang;Kang-Yoon Lee

  64
  Citations

• Symmetric Three-Way Doherty Power Amplifier for High Efficiency and Linearity

  Hyunuk Kang;Hwiseob Lee;Hansik Oh;Wooseok Lee

  62
  Citations

• An Efficient Reconfigurable RF-DC Converter With Wide Input Power Range for RF Energy Harvesting

  Danial Khan;Seong Jin Oh;Khuram Shehzad;Muhammad Basim

  61
  Citations

• Design and Optimization of a Broadband Waveguide Magic-T Using a Stepped Conducting Cone

  Unknown

  58
  Citations

• Doherty Power Amplifier Based on the Fundamental Current Ratio for Asymmetric cells

  Hansik Oh;Hyunuk Kang;Hwiseob Lee;Hyungmo Koo

  57
  Citations

• Broadband Doherty Power Amplifier Based on Asymmetric Load Matching Networks

  Jin-hee Kwon;Min-cheol Seo;Hwi-seob Lee;Je-hyun Gu

  55
  Citations

• Compact loop-coupled spiral antenna for multiband wireless USB dongles

  Unknown

  51
  Citations

• Capacitively Coupled Microstrip Comb-Line Array Antennas for Millimeter-Wave Applications

  Unknown

  46
  Citations

• Circularly Polarized Semi-Eccentric Annular Dielectric Resonator Antenna for X-Band Applications

  Jong Min Lee;Sung-Jin Kim;Gina Kwon;Chan Mi Song

  45
  Citations

• Optimization of a Shared-Aperture Dual-Band Transmitting/Receiving Array Antenna for Radar Applications

  Unknown

  42
  Citations

• Broadband circularly-polarised Spidron fractal slot antenna

  Unknown

  42
  Citations

• Retroreflective Transceiver Array Using a Novel Calibration Method Based on Optimum Phase Searching

  Hyungmo Koo;Jongseok Bae;Woojin Choi;Hansik Oh

  41
  Citations

• CMOS Power Amplifier Integrated Circuit With Dual-Mode Supply Modulator for Mobile Terminals

  Junghyun Ham;Jongseok Bae;Hyungchul Kim;Mincheol Seo

  37
  Citations

• A -20 to 30 dBm Input Power Range Wireless Power System With a MPPT-Based Reconfigurable 48% Efficient RF Energy Harvester and 82% Efficient A4WP Wireless Power Receiver With Open-Loop Delay Compensation

  Sang-Yun Kim;Hamed Abbasizadeh;Behnam Samadpoor Rikan;Seong Jin Oh

  32
  Citations