Ls Industrial Systems Co., Ltd.

Nethom Co., Ltd.

Hyung Jun Jeon

Jin Kuk Hong

Yeong Hwan Kim

Heon Soo Choi

Chang Su Choi

Jae Yul Choo

Jeong Ki Ryoo

Jae Hwan Im

Jung Ki Ruy

Disclosed is a gate system arranged on two gate frames and detects a tag passing between the two gate frames, the gate system including at least two gate frames that are vertically arranged facing with each other; at least two antenna units that are arranged on the at least two gate frames, respectively; and a reader that is arranged on each of the at least two gate frames and enables the at least two antenna units to emit electromagnetic wave to an article passing between the at least two gate frames using a predetermined frequency signal, and obtains information stored in a tag using a signal that the at least two antenna units receives from the at least two antenna units.

Gate system

Disclosed is a vector modulator. The vector modulator can control the amplitude and phase of an input signal, by not using amplitude variable attenuators but using phase shifters. Further, the vector modulator has a simple configuration and enables an input signal to be exactly modulated. Furthermore, the vector modulator can modulate the phase of an input signal throughout all areas in the polar coordinate system.

Vector modulator

Disclosed is an RF transceiver in which transmission and reception are simultaneously performed, wherein a magnitude of a transmission leakage signal mixed into a receiving signal is measured, the maximum and minimum scopes on I/Q vector phase-plane in which an offset vector exists is set using the measured magnitude of the transmission leakage signal, the offset vector offsetting the transmission leakage signal as much as possible, a detection area in which the offset vector exists is determined in the set scope, and the offset vector is detected.

Method and apparatus for detecting offset signal of transmission leakage signal in RF transceiver

Disclosed is an RFID-based reader configured to allow a UHF band RFID reader unit to recognize an RFID tag in a short distance, and to minimize an erroneous recognition, the reader including a gate frame discretely installed at both sides of an entrance and exit, a parabolic surface type reflective plate perpendicularly installed inside of the gate frame, an array antenna arranged on the reflective plate for receiving a tag information transmitted from an RFID tag, and an RFID reader unit for controlling an operation of the array antenna and converting the tag information received from the array antenna to a tag data.

Reader based on RFID

An vector modulator using a time delay and a phase shifter is disclosed, the vector modulator including a time delay () varying a phase of an input signal by time-delaying the input signal; a first coupler () converting the signal outputted in changed phase through the time delay to an I channel signal and a Q channel signal each having a 90&#xb0; phase difference and outputting the I/Q channel signals; a first phase shifter () varying the phase of the I channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable I channel signal; a second phase shifter () varying the Q channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable Q channel signal; and a second coupler () coupling phase-variable I/Q channel signals and outputting the coupled signals.

Growing community of inventors

Hwaseong, South Korea

Hyung Jun Jeon