16results about How to "Improve filtering performance" patented technology

The embodiment of the invention provides a manufacturing method of a display panel, the display panel and a display device, relates to the technical field of display, and aims to optimize the performance of the display panel. The manufacturing method of the display panel comprises the following steps: forming a light-emitting device layer on one side of a substrate, wherein the light-emitting device layer comprises a plurality of light-emitting elements; forming a first light control layer on one side, far away from the substrate, of the light emitting device layer, wherein the first light control layer comprises a plurality of openings which are mutually spaced; a second light control layer is formed, at least part of the second light control layer is located in the opening, the second light control layer comprises resin and dye, light curing treatment and heat curing treatment are carried out in the process of forming the second light control layer, and the light curing treatment is earlier than the heat curing treatment.

The invention discloses an anti-interference filter based on FFT (Fast Fourier Transform), and relates to the field of GNSS (Global Navigation Satellite System) receivers. A radio frequency front end is used for receiving GNSS signals and down-converting the GNSS signals into IF (Intermediate Frequency); the analog-to-digital converter ADC is used for converting the GNSS signal which is received by the radio frequency front end and moved to the intermediate frequency into a digital signal; and the anti-interference filter is used for converting the digital signal from time domain representation to frequency domain representation, eliminating an interference signal in a preset frequency range in a frequency domain according to a preset demand index, and inversely transforming the frequency domain signal subjected to interference elimination back to the time domain. The invention further discloses an interference suppression method of the anti-interference filter based on the FFT, the anti-interference filter based on the FFT is suitable for various GNSS receivers, the anti-interference performance of the receivers can be effectively improved, and the accuracy of navigation and positioning is ensured.

The invention belongs to the field of signal processing, and particularly relates to a feedback adaptive IMM filter for heavy tail noise. The invention provides a feedback adaptive IMM filter for heavy-tailed noise, aiming at the problems of unpredictability of target motion, complexity of a measurement system, performance reduction of an interactive multi-model filtering (IMM) algorithm caused by an introduced heavy-tailed process and measurement noise and uncertainty of a model probability. In the first layer, the initial fusion state is pre-filtered under the participation of target maneuvering characteristics. And the second layer: inferring a system state, a degree-of-freedom parameter, a scale matrix and a target maneuvering characteristic parameter by using the characteristics of Student-t distribution and a variational Bayesian method based on a pre-filtering result. And target maneuvering characteristic feedback acts on model probability calculation and pre-filtering.

The invention provides a method for preparing a photonic crystal fiber with sensing and filtering functions. The method comprises the specific steps that a first layer of air holes are formed in the circle center of quartz; by taking the first layer of air holes as the center, two second type of air holes and three third type of air holes are formed in the periphery of the first layer of air holes along a regular hexagon; by taking the first layer of air holes as the center, two first type of air holes and nine third type of air holes are formed in the periphery of the first layer of air holes along a regular hexagon; thirteen third-type air holes are formed in the periphery of the first-layer air holes in a regular hexagon mode with the first-layer air holes as the center; and preparing a preform according to the arranged cladding, melting and drawing wires, and depositing gold on a polished plane to obtain the photonic crystal fiber, and immersing the photonic crystal fiber in a liquid to be detected when in use. According to the invention, integration of the optical fiber sensor and the filter is realized, high-sensitivity sensing is realized in the X polarization direction, and polarization filtering with adjustable bandwidth and high extinction ratio is realized in the Y polarization direction.

The invention belongs to the technical field of filters, and particularly relates to a duplexer based on SISL and DGS. The duplexer comprises five layers of dielectric substrates which are sequentially arranged from top to bottom, wherein the five layers of dielectric substrates are sub1-sub5 respectively; the upper surface and the lower surface of each layer of dielectric substrate are covered with metal layers, and the ten metal layers G1-G10 are arranged from top to bottom. Three rectangular parts are cut off from the edges of the dielectric substrate sub1 and the dielectric substrate sub2, and the dielectric substrate sub1 and the dielectric substrate sub2 are overlapped; the five layers of dielectric substrates and the ten layers of metal layers are provided with through first metal through hole square arrays, and the metal through hole square arrays of the dielectric substrates and the metal through hole square arrays of the metal layers coincide. Two G-shaped DGS resonators are arranged in the metal layer G2; the duplexer designed by the invention is better in dual-passband out-of-band rejection effect, smaller in size and wider in stopband range.

The application provides a low-profile duplex filter antenna and belongs to the technical field of wireless energy transmission.The low-profile duplex filter antenna comprises an upper metal floor, a dielectric substrate, a lower metal floor, a cavity column, a perturbation via and a suppression via; the lower metal floor is arranged on the lower surface of the lower dielectric substrate; the upper metal floor is arranged on the upper surface of the dielectric substrate; the cavity column penetrates through the upper metal floor, the dielectric substrate and the lower metal floor and surrounds a substrate integrated waveguide cavity; the perturbation via and the suppression via penetrate through the upper metal floor, the dielectric substrate and the lower metal floor; a cross-shaped groove is etched in the center of the upper metal floor; two complementary split ring resonator grooves with different diameters are etched at the connection between the circular cavity and the two side rectangular cavities of the upper metal floor; two feed lines are led out from the two ends of the upper metal floor. The antenna has the characteristics of low profile, is easy to integrate, and simultaneously reduces the manufacturing cost of the antenna and facilitates processing and manufacturing.

The invention discloses a surface acoustic wave signal processing method and system based on an NQAM demodulation algorithm, and the method comprises the steps: obtaining a surface acoustic wave signal, carrying out the interference removal of the surface acoustic wave signal based on an IMS adaptive filtering strategy, and obtaining a target surface acoustic wave signal; and demodulating the target surface acoustic wave signal according to a preset NQAM demodulation algorithm to obtain phase information and amplitude information corresponding to the target surface acoustic wave signal. The error is reduced, the model complexity is controlled at the same time, and stable filtering performance can be ensured to be provided under the limiting condition.

A dual-polarization frequency reconfigurable microstrip patch filter antenna for full-duplex communication includes a stacked bottom dielectric substrate, a metal reflective floor, an intermediate dielectric substrate, a top dielectric substrate and a microstrip patch, a transmitting end microstrip feeder is arranged on the lower surface of the bottom dielectric substrate, a variable capacitance loaded frequency tuning microstrip line that overlaps the microstrip patch non-contactly through the top substrate is arranged on the upper surface of the intermediate dielectric substrate, and a pair of λ / 4 T-type microstrip line resonators symmetrical about the center line of the frequency tuning microstrip line are arranged on the horizontal center plane of the microstrip patch. The present invention introduces a pair of λ / 4T-type microstrip line resonators at the receiving port of the microstrip patch to generate two radiation zero points to obtain good filtering performance and generate a high-frequency resonance point that can be used to expand the working bandwidth of the antenna; the overlapping area of ​​the frequency tuning microstrip line and the microstrip patch is controlled by adjusting the variable capacitance, so that the resonance mode of the transmitting end of the microstrip patch can be tuned.

The invention relates to a dual-polarization high-selectivity frequency selective surface based on a three-dimensional slot line structure, which comprises a plurality of printed circuit boards which are transversely and longitudinally staggered to form a grid shape, each printed circuit board is formed by a plurality of basic unit arrays, and each basic unit comprises a patch unit, a dielectric substrate and a metal micro-unit which are sequentially stacked; the patch unit comprises two interactive patches, each interactive patch comprises a fixed strip and at least one interactive strip arranged at the end part of the fixed strip, and the interactive strips of different interactive patches are arranged in a staggered manner; each metal micro unit comprises a metal foil, a main groove line and a side groove line which are parallel to each other are etched on the metal foil, each main groove line is composed of two opposite T-shaped groove lines, each T-shaped groove line comprises a long groove strip and a short groove strip, the two short groove strips of each T-shaped groove line are oppositely arranged, and a rectangular groove with the width larger than that of each side groove line is formed in the middle section of each side groove line; the method is better in selectivity and angle stability.

The application belongs to the field of microwave technology and discloses a reconfigurable differential filter based on HMCSIW, which comprises a first layer metal layer, a first layer dielectric layer, a second layer metal layer, a second layer dielectric layer and a third layer metal layer, the first layer metal layer is composed of a rectangular patch of a half-mode combline, a pair of trapezoidal microstrip lines, a pair of open-circuit microstrip stubs and a DBCSRR structure, the second layer metal layer is composed of a rectangular slot and a folded SSPPs structure and is a common ground of the structure, and the third layer metal layer is completely consistent with the structure size of the first layer metal layer. The length of the open-circuit stubs connected in parallel on the HMCSIW is controlled by the conduction and shutdown of the PIN diode, so that the resonant frequency of the open-circuit stubs is controlled, then the low-frequency zero point of the filter will change, and the bandwidth and center frequency of the entire filter will change accordingly. The filter can be reconfigured and combined with the differential transmission line, and has a common-mode rejection characteristic.

The application discloses a common-mode and differential-mode integrated inductor, which comprises a common-mode magnetic core, a differential-mode magnetic core, a first coil and a second coil. The common-mode magnetic core comprises a main magnetic ring. The differential-mode magnetic core is arranged on the outer periphery of the main magnetic ring. The first coil comprises a first inverted U-shaped body which is arranged on one side of the main magnetic ring and has one end downwardly extended into the inner ring hole of the main magnetic ring and the other end downwardly extended along the outer side of the main magnetic ring. The second coil comprises a second inverted U-shaped body which is arranged on the other side of the main magnetic ring and one side of the differential-mode magnetic core and has one end downwardly extended into the inner ring hole of the main magnetic ring and the other end downwardly extended into the inner ring hole of the differential-mode magnetic core. Thus, through the optimization design of the magnetic core structure and the coil, the good balance of the common-mode inductance and the differential-mode inductance performance is realized, the common-mode and differential-mode electromagnetic interference signals in the power supply circuit can be effectively inhibited, the electromagnetic compatibility of the power supply circuit is improved, and the stable operation of the electronic equipment is ensured.

The present invention discloses a high-performance active low-pass filter, which relates to high-frequency communication front-end equipment. This solution is proposed to solve the shortcomings of the prior art, such as weak stopband suppression, poor stability, and insufficient bandwidth. A first MOS capacitor and a second MOS capacitor are provided; the first MOS capacitor is used to offset the parasitic capacitance between the signal input end and the signal output end of the P-way filter unit; the second MOS capacitor is used to offset the parasitic capacitance between the signal input end and the signal output end of the N-way filter unit. The advantage is that the MOS capacitor is used as a feedback loop to offset the main zero point of the circuit, improve the out-of-band suppression of the filter, and increase the circuit stability; and the low-pass filter is supplemented with a reasonable optimization design, so that the working bandwidth of the low-pass filter can eventually reach 100MHz to 5.1GHz, with good out-of-band suppression and stable filtering effect.

The invention belongs to the technical field of static frequency converters, and provides a coupled harmonic current filtering method and system for an SFC rectifier, and the method comprises the steps: firstly carrying out the Fourier transform analysis of a current signal and a voltage signal, extracting a coupled harmonic current component in the current signal, and determining the frequency and amplitude of the coupled harmonic current; constructing a correction transfer function according to the extracted coupling harmonic current components; superposing the correction transfer function and a preset basic transfer function to obtain a total transfer function; and finally, according to the obtained total transfer function, changing the equivalent inductance and capacitance values of the filter circuit, and filtering the current of the static frequency converter rectifier. Coupling harmonic current parameters are accurately extracted through a harmonic analysis unit, a constructed correction transfer function can be matched with specific coupling harmonic current in a targeted mode, and the defects that an existing filter is high in universality and poor in pertinence are overcome. The influence of harmonic coupling current is considered, and the filtering effect is improved by correcting the transfer function of the existing filter.

The invention relates to a power grid harmonic detection and control method for a self-adaptive generalized integrator, and the method comprises the steps: improving the stable filtering capability and frequency selection capability of the generalized integrator under a frequency fluctuation condition through introducing an orthogonal feed-forward amplitude compensation branch; the filtering performance of the original generalized integrator on fifth and seventh harmonics is optimized, and the harmonic detection precision is improved; by adjusting the coefficient of the single-stage controller, no-static-error tracking can be carried out on any harmonic signal, and the universality of control under different harmonic working conditions is improved.

The invention discloses a non-reflection filtering circularly polarized antenna based on an asymmetric feed network. The non-reflection filtering circularly polarized antenna comprises a power dividing part, an asymmetric feed part and a radiator part, the terminal open-circuit coupling feeder line and the terminal short-circuit coupling feeder line are orthogonally arranged in a plane space position; meanwhile, the asymmetric feed part generates a broadband 90-degree phase difference required by circular polarization radiation. Meanwhile, out-of-band reflection signals of the asymmetric feed part can generate a broadband 180-degree phase difference between two paths, the reflection signals are effectively dissipated by an isolation resistor loaded on the power dividing part, and therefore the broadband non-reflection performance is achieved. And then, a triangular element topological structure is constructed by adopting a stacked patch form, so that good filtering performance is realized. The non-reflection filtering circularly polarized antenna is simple in structure, and has the advantages of non-reflection bandwidth, excellent filtering characteristic and the like.

The present invention relates to a nonlinear filtering method based on self-attention and grid trajectory piecewise linear approximation. The method comprises: obtaining a nonlinear system and its initial state estimation value, performing state estimation by a Kalman filter algorithm embedded in a self-attention mechanism network, and training the network comprises: constructing a state trajectory according to the nonlinear system and the initial state estimation value, and approximating the original nonlinear model by a grid trajectory piecewise linear approximation method to obtain a grid piecewise approximate model of the system, constructing a training data set according to the nonlinear system model and randomly generated noise, constructing a pre-training data set according to the grid piecewise approximate model of the system and a batch estimation algorithm, performing batch pre-training on a simplified self-attention mechanism network according to the pre-training data set, and then saving the network weights, and then embedding it in a Kalman filter framework and performing end-to-end formal training using the training data set. The Kalman filter embedded with the self-attention mechanism of the present invention can obtain a better filtering effect.