Abstract:
A cost-effective multiple band resonator for a chipless RFID tag of the present invention may comprise a dielectric support plate of a dielectric material having a thickness and a predetermined dielectric constant; a pair of mutually parallel insulating parts to expose the surface of the dielectric support plate on one surface of the dielectric support plate; a waveguide signal line formed by coating a conductive material excluding a plurality of resonance patterns exposing the surface of the dielectric support plate along an area defined by the pair of the insulating parts; and a partially coated ground contact surface formed as one surface of the dielectric support plate excluding an uncoated area is partially coated within a ground contact area installed in the outside of the pair of the insulating parts with the conductive material and as the surface of the dielectric support plate is exposed in the uncoated area.
Abstract:
본 발명은 온도의 변화에 관계없이 일정한 전류가 흐르게 하는 온도 보상 회로 및 이를 구비하는 장치를 제공한다. 본 발명에 따른 온도 보상 회로는, 일정한 전류를 흘려주는 전류원과 상기 전류원에 연결된 제2 전류 미러에 공통으로 연결된 온도 보상 회로에 있어서, 일정한 전압을 공급하는 전압원, 상기 전압원에 연결되어 상기 전압원으로부터 전압을 공급받으며 온도에 비례하여 출력 전류를 변화시키는 제1 트랜지스터, 상기 제1 트랜지스터의 출력단 및 상기 전류원에 연결된 제1 전류 미러, 및 상기 제1 전류 미러의 출력단과 접지단 사이에 연결되어 상기 제1 전류 미러에 흐르는 전류를 조절하는 제1 저항을 구비한다.
Abstract:
PURPOSE: A predistortion linearizer is provided to increase the integration of a circuit by using a simple circuit instead of an attenuator to control the size of a distortion signal. CONSTITUTION: A parallel predistortion linearization system(201) improves the linearity of a nonlinear amplifier by generating a signal which has the same size of a distortion signal while having the opposite phase to the distortion signal. A first resistor(202) is connected between the input terminal and the output terminal of the parallel predistortion linearization system. A second resistor(203) is connected to one end of the first resistor and is interposed between the output terminal of the parallel predistortion linearization system and the ground. A power amplifier(204) is comprised of a nonlinear amplifier which is connected between the input terminal of the signal and the other terminal of the first resistor.
Abstract:
PURPOSE: A digital pre distorter and this signal distortion method of the pipeline of using the cord algorithm reduce the use area of the digital pre distorter by constituting the core unit and polynomial part with the form of pipeline. CONSTITUTION: A core unit(230) comprises a plurality of core blocks outputting the amplitude and phase of the digital signal. Core blocks are composed of the form of pipeline. A distorter(240) distorts the phase outputted in the core unit. Distorter comprises the register Block(240a) storing the coefficient of the inverse function of the polynomial part(240b) distorted and the signal inputted to the core unit to the amplitude inputted to the core unit and the value coping with phase with the inverse function according to the amplitude.
Abstract:
A Doherty amplifier is provided to improve efficiency while maintaining linearity by tuning output harmonic impedance of a carrier amplifier and a peak amplifier. A carrier amplifier performs the amplification operation of a signal regardless of the input signal level. A peak amplifier performs an amplification operation from a high power output when the input signal level is above the predetermined level. An output synthesizing circuit synthesizes and outputs the output of the carrier amplifier and the peak amplifier. An input branch circuit distributes the input signal to the carrier amplifier and the peak amplifier. A carrier amplifier output harmonic impedance tuning net(HTC) is installed in a rear part of the carrier amplifier and tunes the output harmonic impedance of the carrier amplifier. A peak amplifier output harmonic impedance tuning net is installed in the rear part of the peak amplifier and tunes the output harmonic impedance.
Abstract:
A small Doherty amplifier with an extended bandwidth according to embodiments of the present invention comprises a main amplifying unit; an auxiliary amplifying unit; a load impedance modulating unit which is connected between output nodes of each of the main amplifying unit and the auxiliary amplifying unit to provide the main amplifying unit with load impedance modulated according to the operation of the auxiliary amplifying unit; and a harmonic control matching circuit unit which performs impedance matching of a reference frequency and at least one harmonic component of a signal component in the output nodes of the auxiliary amplifying unit.
Abstract:
무선으로 전력을 전송할 때, 가변전력을 전송하는 장치 및 방법에 관한 것으로 고효율 가변전력 전송 장치는 일정한 진폭의 고주파 신호를 시간축에서, 상기 고주파 신호의 온/오프의 반복을 통해 변조함으로써 가변전력을 출력하고, 일정 레벨의 공급전압에 기초하여 상기 가변전력을 타겟 디바이스의 요구 전력에 대응하도록 증폭하며, 전원소스로부터 수신한 교류전압을 직류전압으로 변환하고, 상기 직류전압에 기초하여 생성된, 상기 일정 레벨의 공급전압을 상기 전력증폭기에 공급한다.
Abstract:
According to embodiments of the present invention a wideband transmission line balun transformer comprises: a first magnetic material core having flatness in a first band; a second magnetic material core having flatness in a second band which is inconsistent with the first band; and one or more transmission lines wound around a cross section of each magnetic flux of the first and second magnetic material core respectively or together. [Reference numerals] (11) First balun circuit; (13) Second balun circuit