Abstract: This invention discloses a power divider, a radio frequency transceiver and a multi-stage power divider, the power divider comprises a variable gain amplifier, a power dividing circuit, a power detection circuit and a comparison circuit. The variable gain amplifier comprises a first input terminal, a control terminal and a first output terminal, the first input terminal is configured to receive a first local oscillation signal, and the first output terminal outputs a variable output signal to the power dividing circuit. The power dividing circuit outputs a second local oscillation signal to a next stage power divider and outputs a third local oscillation signal to an up/down converter. The power detection circuit outputs a detection voltage. The comparison circuit receives a reference voltage and the detection voltage and compares the reference voltage with the detection voltage and outputs a bias voltage to the power terminal based on a comparison result.

Abstract: A single beam steering system and a multi-beam steering system are provided. The single beam steering system includes a fine-beam tuner and a phased array unit. The fine-beam tuner includes at least one power divider/combiner, a plurality of level controllers and a plurality of switchable inverters. The fine-beam tuner is used to control phase differences between a plurality of phased array signals of the phased array unit. The multi-beam steering system includes an N×N phased array unit, a plurality of M-channel power dividers/combiners and a plurality of the fine-beam tuners mentioned above, wherein the N is an integer greater than 1, and the M is an integer greater than 1. The fine-beam tuners are used to control phase differences between a plurality of phased array signals of the N×N phased array unit.

Abstract: This invention discloses a power divider, a radio frequency transceiver and a multi-stage power divider, the power divider comprises a variable gain amplifier, a power dividing circuit, a power detection circuit and a comparison circuit. The variable gain amplifier comprises a first input terminal, a control terminal and a first output terminal, the first input terminal is configured to receive a first local oscillation signal, and the first output terminal outputs a variable output signal to the power dividing circuit. The power dividing circuit outputs a second local oscillation signal to a next stage power divider and outputs a third local oscillation signal to an up/down converter. The power detection circuit outputs a detection voltage. The comparison circuit receives a reference voltage and the detection voltage and compares the reference voltage with the detection voltage and outputs a bias voltage to the power terminal based on a comparison result.

Abstract: A switch-type phase shifter including a phase shifting unit is provided. The phase shifting unit includes two half circuits and a first switch connected to the half circuits and receiving a first control signal. Each half circuit includes a first variable capacitor, a second variable capacitor, a second switch and a variable inductor. The two ends of the first variable capacitor are coupled to the input and the control nodes of the half circuit respectively. The two ends of the second variable capacitor are coupled to the output and control nodes of the half circuit respectively. The first and second ends of the second switch are coupled to the output and input nodes respectively, and the third end thereof is coupled to the control node and receives a second control signal. The two ends of the variable inductor are coupled to the input and output nodes respectively.

Abstract: A dual band beam generator comprises a Butler matrix, two first phase shifter and two second phase shifter. The Butler matrix includes first to eighth transceiver ports, the first to fourth transceiver ports are disposed at one side of the Butler matrix, and the fifth to eighth transceiver ports are disposed at an opposite side of the Butler matrix, two first ports of the two first phase shifters are respectively connected to the fifth and eighth transceiver ports of the Butler matrix, and two first ports of the two second phase shifters are respectively connected to the sixth and seventh transceiver ports of the Butler matrix.

Abstract: The disclosure provides a Butler Matrix. The Butler Matrix includes: a plurality of couplers having a circuit of a cuboid structure, a plurality of crossover lines, a plurality of three-dimensional crossover lines having a three-dimensional structure, and a plurality of phase shifters. The phase shifters, the crossover lines, and the three-dimension crossover lines are been coupled between one of the couplers and the other of the couplers.

Abstract: A phase shifter with broadband and a phase array module using the same are provided. The phase shifter includes at least one phase shifting unit. The phase shifting unit includes a first switch, a first capacitor, a second capacitor, a first inductor, a second switch, a second inductor, a first resistor and a second resistor. The first capacitor is connected between the first inductor and a second end of the first switch. The second capacitor is connected between the first inductor and a third end of the first switch. A second end of the second switch is connected to a ground end. The two ends of the second inductor are respectively connected to a ground end and a third end of the second switch. The first inductor is connected between the first capacitor and the third end of the second switch.

Abstract: The disclosure provides a Butler Matrix. The Butler Matrix includes: a plurality of couplers having a circuit of a cuboid structure, a plurality of crossover lines, a plurality of three-dimensional crossover lines having a three-dimensional structure, and a plurality of phase shifters. The phase shifters, the crossover lines, and the three-dimension crossover lines are been coupled between one of the couplers and the other of the couplers.

Abstract: The disclosure provides a method for beamforming and a control apparatus using the same. An embodiment of the method includes: adjusting a first amplitude magnification of a first baseband signal, and adjusting a second amplitude magnification of the first baseband signal; generating a first signal according to the first baseband signal and the first amplitude magnification, and generating a second signal according to the first baseband signal and the second amplitude magnification; inserting a phase difference between the first signal and the second signal; and converting the first signal and the second signal having the phase difference therebetween into a beamformed signal to control an antenna.

Abstract: A modular transmission line device includes a power input module, a transmission line module, a load module and a plurality of LED modules. The power input module, the transmission line module and the load module are sequentially electrically connected and assembled. The power input module transmits an AC voltage to the transmission line module and the load module. The AC voltage is used to generate an electromagnetic wave in the transmission line module according to a loading impedance of the load module and a characteristic impedance of the transmission line module. Each LED module is electrically connected with and assembled with the transmission line module. The LED modules radiates according to the electromagnetic wave.

Abstract: A near-field antenna measurement method and a measurement system using the same is disclosed. The measurement method chooses a measurement block to measuring an antenna signal emitted by an antenna under test on the measurement block. Firstly, a plurality of initial measurement points is chosen on measurement block and initial electric field values of the antenna signal at the initial measurement points are measured. Then, a plurality of initial interpolation points cooperating with the initial measurement points on the measurement block is chosen to comply with the sampling theorem. Interpolation is performed on the initial electric field values to obtain initial electric field interpolation values respectively corresponding to the initial interpolation points. Finally, the initial electric field values and the initial electric field interpolation values are processed to obtain electric filed convergence values of the antenna signal at the initial measurement points and the initial interpolation points.

Abstract: A switchable bandpass filter includes a first stepped-impedance resonator, a second stepped-impedance resonator wirelessly coupled to the first stepped-impedance resonator, and a first diode connected to one end of the second stepped-impedance resonator.

Abstract: A differential signal driven direct-current voltage generating device is proposed, which is designed for use with a PLL (phase-locked loop) circuit or a DLL (delay-locked loop) circuit system for generating an output of a direct-current (DC) voltage in response to a pair of differential signals, such as phase-difference signals; and which is characterized by the utilization of a capacitor-switched voltage doubler for doubling the output voltage of a charge pump so that the doubled voltage can be used as a control voltage for a PLL-VCO (voltage-controlled oscillation) or a DLL-VCDL (voltage-controlled delay line) circuit for generation of an output oscillating signal with a wider frequency range.

Abstract: A switched-capacitor charge pump device is proposed, which is designed for integration to a circuit system, such as a PLL (phase-locked loop) circuit system, for generation of an output direct-current (DC) voltage with a wide amplitude range; and which is characterized by the utilization of two switched-capacitor circuit units in addition to the output capacitor circuit and the utilization of an output voltage comparing circuit (such as a Schmitt trigger) for comparing the end-result output DC voltage against a half-amplitude drive voltage such that when the switched-capacitor circuit units are subjected to a charging-discharging action for voltage pump-up or pump down operations, the switched-capacitor circuit units are switched between a full-amplitude drive voltage and a half-amplitude drive voltage. This feature allows the invention to provide an output DC voltage with a wider amplitude range than prior art.

Abstract: A unilateral feedback power amplifier utilizes new feedback techniques and devices to make the amplified high-frequency signal unilateral, let the output power, power gain and impedance matching simultaneously accomplish the optimal values, and enhance the stability of the system. In this feedback amplifier, a generalized multi-port feedback circuit is in shunt with the input terminal and the output terminal of the power transistor. This generalized multi-port feedback circuit receives an amplified high-frequency signal and eliminates the reverse admittance of the amplified high-frequency signal to let the admittance value of the output amplified high-frequency signal approach zero so as to be unilateral. Moreover, the generalized multi-port feedback power amplifier differs from the conventional power amplifier of cascaded architecture in that the ground terminal of the power transistor is directly connected to the system ground.

Abstract: A differential signal driven direct-current voltage generating device is proposed, which is designed for use with a PLL (phase-locked loop) circuit or a DLL (delay-locked loop) circuit system for generating an output of a direct-current (DC) voltage in response to a pair of differential signals, such as phase-difference signals; and which is characterized by the utilization of a capacitor-switched voltage doubler for doubling the output voltage of a charge pump so that the doubled voltage can be used as a control voltage for a PLL-VCO (voltage-controlled oscillation) or a DLL-VCDL (voltage-controlled delay line) circuit for generation of an output oscillating signal with a wider frequency range.

Abstract: A switched-capacitor charge pump device is proposed, which is designed for integration to a circuit system, such as a PLL (phase-locked loop) circuit system, for generation of an output direct-current (DC) voltage with a wide amplitude range; and which is characterized by the utilization of two switched-capacitor circuit units in addition to the output capacitor circuit and the utilization of an output voltage comparing circuit (such as a Schmitt trigger) for comparing the end-result output DC voltage against a half-amplitude drive voltage such that when the switched-capacitor circuit units are subjected to a charging-discharging action for voltage pump-up or pump down operations, the switched-capacitor circuit units are switched between a full-amplitude drive voltage and a half-amplitude drive voltage. This feature allows the invention to provide an output DC voltage with a wider amplitude range than prior art.

Abstract: A single-pole-double-throw switch is provided, which is configured to be integrated with a bandpass filtering function and includes four quarter-wavelength transmission lines connected in series, five resonators connected in parallel to each other, and four transistors connected in parallel to four of the five resonators. When two of the four transistors are turned on and the others are turned off, the single-pole-double-throw switch is equivalent to a third-order quarter-wavelength short-circuited stub bandpass filter.

Abstract: A switchable bandpass filter includes a first stepped-impedance resonator, a second stepped-impedance resonator wirelessly coupled to the first stepped-impedance resonator, and a first diode connected to one end of the second stepped-impedance resonator.

Abstract: A power amplifier includes a first transformer, a first transistor, a first resistor, a second transformer, a second transistor, a second resistor, and a bias circuit. The first transformer drives the first transistor. The second transformer drives the second transistor. The first transformer is connected in series with the second transformer. The first transistor is connected in series with the second transistor. Therefore, the power amplifier has input impedance and output power both greater than those of a conventional power amplifier.