11 results about "Resonant filter" patented technology

This invention discloses a surface acoustic wave (SAW) device, comprising: a resonant filter element including multiple parallel resonators, one end of which is connected to at least one ground port; wherein at least two of the parallel resonators are connected to the same ground port, and the ground port connected to the at least two parallel resonators is a common ground port; and a packaging substrate located on one side of the resonant filter element; the packaging substrate includes a first substrate, which includes a common ground region and at least one independent cut-out region; the independent cut-out region is correspondingly disposed to at least one of the common ground ports and connected to the corresponding common ground port; the independent cut-out region is connected to the common ground region through a connecting portion, the extension direction of which is perpendicular to the SAW propagation direction of the SAW device. This invention improves the isolation performance of the device.

The application discloses a concave-convex deformation resonance type back-flushing stainless steel filter tank, and belongs to the technical field of stainless steel filter tanks. The filter tank comprises a protective shell, double-cone filter tanks rotatably arranged in the protective shell through collinear rotating shafts A and B, a busbar fixedly arranged on the rotating shaft A, two resonant filter screens with the same structure arranged in the double-cone filter tank, a vibration exciting assembly for exciting the resonant filter screen, vibration springs with two ends connected to the center points of the two resonant filter screens, a filter screen deformation driving assembly for driving the resonant filter screen to deform concave-convexly, a vibration power device for driving the vibration exciting assembly to work, and a turnover motor for driving the rotating shaft B to rotate in the positive direction and the reverse direction. The stainless steel filter tank has a reasonable structure, can significantly improve the flushing efficiency and the flushing quality, and effectively prevents impurities from blocking filter screen holes.

This invention discloses a high-precision, wide-tunable hybrid integrated external cavity semiconductor laser and its tuning method, comprising a semiconductor optical amplifier (1), a SiO2 extension chip (2), and a computer (3). A silicon-based ring resonant filter (02) is integrated on the SiO2 extension chip (2). The silicon-based ring resonant filter (02) includes a first micro-ring resonator (001) and a second micro-ring resonator (002), which are connected in series. The refractive index of the waveguide is adjusted using the waveguide thermo-optic effect to achieve "coarse" wavelength tuning and obtain a wide wavelength tuning range. A phase shifter (04) is integrated on the SiO2 extension chip (2), which is used for fine tuning of the cavity length to achieve "fine" wavelength tuning. This invention integrates a miniature spectrometer on the SiO2 extension chip to provide feedback wavelength information and achieve high wavelength tuning accuracy.

The invention discloses a harmonic suppression method and system for a power grid, and relates to the technical field of harmonic suppression, and the method comprises the steps: obtaining a plurality of pieces of training harmonic current data, carrying out the preprocessing of each piece of training harmonic current data, generating a harmonic feature set, and carrying out the weighting of a loss function based on a preset amplitude. And training a preset initial harmonic current prediction model according to the harmonic feature set to obtain a corresponding target harmonic current prediction model, obtaining harmonic current data of the power grid, performing harmonic distribution prediction on the harmonic current data by using the target harmonic current prediction model to obtain corresponding harmonic prediction current amplitude data, and performing harmonic prediction on the harmonic prediction current amplitude data. And performing optimization solution on a preset objective function by adopting the harmonic prediction current amplitude data to obtain corresponding treatment parameters, and adjusting the multi-branch parallel resonant filtering device of the power grid by adopting the treatment parameters. The technical problems that a traditional power grid harmonic suppression method is difficult to adapt to dynamic change requirements of power grid working conditions and the reliability of power grid operation is reduced are solved.

A display device includes light emitting elements disposed in pixels; a color conversion layer disposed on the light emitting elements; a color filter layer disposed on the color conversion layer; and a resonant filter disposed between the color conversion layer and the color filter layer. The resonant filter includes a first semi-transmissive layer, a second semi-transmissive layer, and a medium disposed between the first semi-transmissive layer and the second semi-transmissive layer.

The embodiment of the present application provides a kind of generation method, equipment and radio frequency transmitter of radio frequency signal, wherein the method comprises: the initial signal is mixed with first local oscillator signal and second local oscillator signal respectively, to obtain first output signal;The first output signal is resonant filtered using target filter parameter, to obtain second output signal, wherein the target filter parameter is set to be used to suppress third harmonic generated in signal transmission process, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components for generating third-order intermodulation signal and image signal.By the present application, the problem that the efficiency of suppressing interference signals in the output signal is low is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved.

This invention discloses an ultra-narrowband optical filter and its design method, belonging to the field of micro-nano optical device technology. It is a reflective all-dielectric guided-mode resonant filter, comprising, from bottom to top, a substrate, a planar waveguide layer, a single-layer one-dimensional subwavelength grating layer, and a single-layer anti-reflection film. The design method includes initial tuning of the resonant wavelength, optimization of the ultra-narrowband bandwidth, fine-tuning of the resonant wavelength, and synergistic optimization of sideband suppression. It clarifies the priority of adjusting each structural parameter, achieving narrowband reflection filtering through the guided-mode resonance effect of the grating and waveguide layer. Through the synergistic design of the single-layer anti-reflection film and the resonant structure, non-resonant broadband background reflection is suppressed without disrupting the ultra-narrowband resonant peak. At the target filtering wavelength of 1064nm, an ultra-narrowband filter with a peak reflectivity of 100% and a full width at half maximum (FWHM) as low as 0.03nm can be achieved, with a sideband suppression ratio exceeding 30dB. This solves the core defect of existing technologies that cannot simultaneously achieve ultra-narrowband filtering and high sideband suppression ratio.

The utility model provides a power amplification circuit and radio frequency steam ablation equipment, relates to the technical field of medical equipment, is used for solving the technical problems that in the prior art, a power amplification circuit in the radio frequency steam ablation equipment is large in switching loss, complex in control and difficult in synchronization, and comprises a zero-voltage switch module and a resonance filtering module, the zero-voltage switch module controls a signal to drive the controllable switch to be switched on and switched off periodically, and the input direct current is converted into pulse current; a resonant element in the zero-voltage switch module is used for enabling the voltage at the two ends of the zero-voltage switch to approach to zero when the zero-voltage switch is switched on or switched off; and the resonant filtering module converts the pulse current into a sinusoidal current with a target frequency, and transmits the sinusoidal current to the radio frequency steam ablation catheter, so that the power amplification circuit can realize zero-voltage turn-on or turn-off, the switching loss in the power amplification circuit is reduced, the zero-voltage switch module only needs to be provided with a controllable switch, and the control is relatively simple.

The invention discloses a surface acoustic wave device, and the device comprises a resonant filtering body which comprises a plurality of parallel resonators, and one end of each of the plurality of parallel resonators is connected to at least one grounding port; wherein one ends of at least two parallel resonators in the plurality of parallel resonators are connected to the same grounding port, and the grounding port connected with the at least two parallel resonators is a common grounding port; the packaging substrate is positioned on one side of the resonant filtering body; the packaging substrate comprises a first substrate, and the first substrate comprises a common grounding area and at least one independent cut area; the independent cutting regions are arranged corresponding to at least one of the public grounding ports, and the independent cutting regions are connected with the corresponding public grounding ports; the independent cut regions are connected with the common grounding region through connecting parts, and the extension direction of the connecting parts is perpendicular to the surface acoustic wave propagation direction of the surface acoustic wave device. The isolation performance of the device is improved.

The application discloses an extremely low frequency driven MMC topology circuit and a control method thereof, comprising three resonant filter modules, two ends of the resonant filter modules are electrically connected with upper bridge arm circuits and lower bridge arm circuits respectively, the upper bridge arm circuits and the lower bridge arm circuits each comprise N-1 high-capacitance voltage submodules and one low-capacitance voltage submodule; the N-1 high-capacitance voltage submodules are connected in series in turn, and the low-capacitance voltage submodule is connected in series at the end. The application utilizes the resonant circuit to suppress the double frequency component of the submodule capacitance voltage, thereby suppressing the submodule capacitance voltage fluctuation; based on the output waveform performance improvement problem under the extremely low frequency driving condition, the application can suppress the harmonic content by increasing the output level number, and simultaneously realizes the effective tracking of the output current and the submodule capacitance voltage balance by combining the multivariable closed loop control.

This invention provides a voltage setting method, apparatus, device, and readable storage medium. The method includes: starting from a first preset voltage value, gradually increasing the voltage value of an adjusting element according to a preset step size until the voltage value of the adjusting element reaches a second preset voltage value; recording a first monitoring value corresponding to the optical signal intensity at the input of a micro-ring modulator and a second monitoring value corresponding to the optical signal intensity at the output of the micro-ring modulator at each voltage value, wherein the second monitoring value changes with the voltage value of the adjusting element; determining whether there is distortion in the resonant filter spectrum of the micro-ring modulator based on the recorded information; selecting a target second monitoring value from the recorded second monitoring values ​​according to a selection strategy corresponding to the determination result; and setting the voltage value of the adjusting element to the voltage value corresponding to the target second monitoring value. Through this invention, the wavelength of the incident optical signal is positioned at a specific location in the filter spectrum of the micro-ring modulator.