Patent application number | Description | Published |
20120319771 | APPARATUS FOR CALIBRATING AMPLITUDE AND PHASE ERRORS, MULTIPORT AMPLIFIER INCLUDING THE SAME, AND METHOD OF AMPLIFYING THE MULTIPORT AMPLIFIER - A multiport amplifier modulates a reference quadrature phase shift keying (QPSK) signal using an input RF signal to an input hybrid network, generates a plurality of binary phase shift keying (BPSK) signals by demodulating RF signals that are amplified by a plurality of power amplifiers, detects an amplitude error and a phase error of two corresponding amplified RF signals by comparing a QPSK signal that is generated by coupling two RF signals having a phase difference of 90° among the plurality of BPSK signals with a reference QPSK signal, and compensates the detected amplitude error and phase error. | 12-20-2012 |
20130207749 | DIGITAL ATTENUATOR WITH REDUCED PHASE DIFFERENCE - Disclosed is a digital attenuator, and more particularly, a digital attenuator for improving a performance in various respects, and also provided is a structure for reducing a phase difference of the digital attenuator by equipping an inductor as a phase retardation element. | 08-15-2013 |
20130259107 | APPARATUS AND METHOD FOR MULTIPORT AMPLIFICATION IN COMMUNICATION SYSTEM - Disclosed is an apparatus and a method for multiport amplification configured to amplify a signal input to a multi-input port and output the amplified signal to a multi-output port in order to normally transmit/receive a signal in a communication system. The apparatus and the method are configured to: amplify an input signal input through a multi-input port, detect a phase error and an amplitude error of the input signal, and then calculate a phase error value and an amplitude error value of the input signal; correct the phase error and the amplitude error of the input signal through the phase error value and the amplitude error value of the input signal; and then amplify the input signal of which the phase error and the amplitude error are corrected, and output the input signal to a multi-output port. | 10-03-2013 |
20140125427 | WIDE BAND SUM & DIFFERENCE CIRCUIT FOR MONOLITHIC MICROWAVE INTEGRATED CIRCUIT - Disclosed is a wide band sum & difference circuit for a monolithic microwave integrated circuit according to an exemplary embodiment of the present invention. The wide band sum & difference circuit for a monolithic microwave integrated circuit according to an exemplary embodiment of the present invention, including: a Range coupler having one terminal connected to a plurality of first ports that receive a signal and the other terminal connected to a plurality of second ports that output signals; one λ/4 line that is connected between one output terminal and one second port of the Range coupler in series; and one short stub λ/4 line that is connected with the other output terminal and the other second port of the Range coupler in parallel. | 05-08-2014 |
20140152395 | LOW PHASE SHIFT VOLTAGE VARIABLE ATTENUATOR - Disclosed is a low phase shift voltage variable attenuator. The low phase shift voltage variable attenuator may include: a first directional coupler including a first input terminal in which a signal is input, a first isolation terminal connected to a ground power source through a termination resistor, a first coupling terminal, and a first through terminal; a second directional coupler including a second input terminal through which an attenuated signal, which is the attenuated input input signal, is output, a second isolation terminal connected to a ground power source through a termination resistor, a second coupling terminal, and a second through terminal; and a signal attenuating unit connected to the first coupling terminal, the first through terminal, the second coupling terminal, and the second through terminal, and configured to attenuate a signal transmitted through the first directional coupler to transmit the attenuated signal to the second directional coupler. | 06-05-2014 |
20150035619 | PHASE SHIFTER AND METHOD OF SHIFTING PHASE OF SIGNAL - Provided is a phase shifter for shifting a phase of a signal the phase shifter including an input unit to split an input signal into a plurality of signals having different phases, a connection unit to change at least one of magnitudes and phases of the plurality of signals, apply the changed plurality of signals to a plurality of loads, and receive a plurality of return signals generated when the applied signals are returned by the plurality of loads, and an output unit to generate an output signal having a predetermined phase difference from the input signal based on the return signals. | 02-05-2015 |
20150180441 | MICROWAVE SWITCH AND METHOD OF MANUFACTURING MICROWAVE SWITCH - Provided is a microwave switch including at least one semiconductor device connected to a transmission line and grounded in parallel, and at least one inductor connected in series to the transmission line. When the semiconductor device is shorted, the inductor may perform impedance matching through an interaction with the semiconductor device. | 06-25-2015 |
20150256128 | MULTI-PORT AMPLIFIER AND METHOD FOR CONTROLLING THEREOF - The present invention provides a multi-port amplifier which adopts a pair of SP4T switches and a pair of hybrid couplers in order to flexibly adjust an amplification mode. By using the proposed invention, the limited system flexibility and reconfigurability due to fixed input and output relations are overcome regardless of a component failure in a system. Moreover, signal amplification based on effective signal distribution and combination can be consistently performed according to various port configurations by different switching modes. Thus, the overall practicality of outputs comparing to the conventional multi-port amplifier can be effectively increased within an available lifespan of the system. | 09-10-2015 |