Inventor

KIM CHANG-JOO

KR64 patents

⚠️ This page may combine multiple inventors who share the name “KIM CHANG-JOO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

KIM CHANG-JOO

KOREA ELECTRONICS TELECOMM

Method for seamless inter-frequency hard handover in radio communication system

Multi-satellite access antenna system

Horn antenna for circular polarization using planar radiator

Arrangement structure of electromagnetic band-gap for suppressing noise and improving signal integrity

Ultra isolation antenna

Microstrip patch antenna having high gain and wideband

Microstrip patch antenna using MEMS technology

Method for controlling power level based on packet error rate in wireless personal area network system

Circular polarized helical radiation element and its array antenna operable in TX/RX band

Method of generating pilot pattern for adaptive channel estimation in OFDMA systems, method of transmitting/receiving using the pilot pattern and apparatus thereof

Antenna system for tracking mobile satellite and carrier having the same

High-gain radiating element structure using multilayered metallic disk array

Method for performing handover based compressed mode and common frequency of neighbor cells

Method for deciding array spacing of array antenna by using genetic algorithm and array antenna having sofa structure with irregular array spacing

Method for designing multiband antenna using genetic algorithm device linked to full electromagnetic wave analyzing device

Offset hybrid antenna using focuser

Method for measuring antenna characteristics out operational frequency range of chamber

Inverted L-shaped antenna

Method for managing multiple frequency assignment using terminal&#39;s received performance in OFDMA WRAN system

Small monopole antenna having loop element included feeder

Method for controlling power level of received signal in ultra wide band transmission system

Method and apparatus for radio propagation modeling using ray-tracing method

Method for generating two-dimensional orthogonal variable spreading code and MIMO system using the same

Comb polarizer suitable for millimeter band applications

Method for identifying OFDM communication signal using OFDM symbol estimation

Probe and antenna using waveguide

Method for evaluating spectrum utilization efficiency in radio system sharing frequency

Cable to waveguide transition apparatus having signal accumulation form of backshort and active phase shifting using the same

Apparatus and method for generating pulse based on time delay and wave transform and transmitter of multi-frequency band communication system using the same

HWANG SUNG-HYUN

Method of generating pilot pattern for adaptive channel estimation in OFDMA systems, method of transmitting/receiving using the pilot pattern and apparatus thereof

Method of generating pilot pattern for adaptive channel estimation in OFDMA systems, method of transmitting/receiving using the pilot pattern and apparatus thereof

Network communication method and network device using preamble

UM JUNG SUN

Communication method using a preamble to share characteristic information, method for generating the preamble, and communication system to which the methods are applied

Method and device for transmitting a preamble in a wireless communication system

Method and device for communication between devices with different transmission coverage

JUNG YOUNG-BAE

Multi-mode antenna and method of controlling mode of the antenna

Antenna system for tracking satellite

KOREA MACHINERY & METAL INST

Tin-bismuth based lead-free solder for copper and copper alloys

Improvement of surface property of tip and nozzle for gas welder made of copper and copper alloys by chemical conversion coating treatment

HWANG SUNG HYUN

Apparatus and method for controlling subcarrier spacing in a wireless communication system

Method for using flexible bandwidth in OFDMA-based cognitive radio system, base station and subscriber station using the same

YUN JE-HOON

Isolation antenna for repeater

KANG BUB JOO

Method of frequency channel assignment using effective spectrum sensing in multiple frequency assignment system

SIM DONG-UK

Electromagnetic absorber using resistive material

OH SOON-SOO

Apparatus and method for measuring antenna radiation patterns

ELECTRONICS & TELECOMMUNICATIONS RES INST

Method of generating pilot pattern for adaptive channel estimation in OFDMA systems, method of transmitting/receiving using the pilot pattern and apparatus thereof

SAMSUNG ELECTRONICS CO LTD

Method and apparatus for canceling tone signal noise generated when using a speakerphone in a digital key telephone apparatus

EOM SOON-YOUNG

Shaped-beam antenna with multi-layered metallic disk array structure surrounded by dielectric ring

UM JUNG-SUN

Apparatus and method for communication in cognitive radio network

KO GWANGZEEN

Hybrid beaconing method

Method for managing multiple frequency assignment using terminal's received performance in OFDMA WRAN system