560 results about "Passband" patented technology

The invention relates to a circularly polarized quasi-absorption filtering phased-array antenna. A unit of the antenna comprises a multi-layer dielectric substrate, a semi-cured layer, a metal floor, a stacked patch and an orthogonal H-shaped gap, the first dielectric substrate is provided with a parasitic square loop, the second dielectric substrate is provided with a cross-shaped strip, and radiation zero points are introduced to the upper and lower edges of a passband respectively; the 3dB orthogonal directional coupler and the L-shaped feeder form a feed network, circularly polarized radiation is realized through slot coupling, and an isolation port of the 3dB orthogonal directional coupler is connected with a 50-ohm resistor, so that the energy of a lower stop band is absorbed, the energy of an upper stop band is reflected, and a quasi-absorption filtering characteristic is presented; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good filtering performance, and when array scanning is 0-45 degrees, the overlapping impedance bandwidth is 12%, the axial ratio bandwidth is 15.8%, and the maximum scanning loss is 2.3 dB; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good quasi-absorption filtering performance, and has huge potential in millimeter wave satellite communication application.

The invention provides a signal acquisition system of a photoelectric detector. In the signal acquisition system, a transimpedance pre-amplification circuit is arranged at the output end of the photoelectric detector, and a passive high-pass filter circuit is connected between the transimpedance pre-amplification circuit and a post-voltage amplification circuit. And a feedback network is formed in the transimpedance pre-amplification circuit and is used for converting a current signal output by the photoelectric detector into a proportional first voltage signal and outputting the proportional first voltage signal. The filter circuit is a third-order LC high-pass filter circuit and is used for suppressing direct current, low frequency and self-beat frequency components and keeping a 10-90MHz pass band flat. The rear voltage amplification circuit adopts a voltage amplification structure of a voltage operational amplifier, the voltage gain Av is 6-10, and the super-band gain is limited through a shunt capacitor. According to the embodiment of the invention, through the structure and parameter setting, the noise gain peak value is suppressed, and the system stability is improved.

The invention provides an inhaul cable self-vibration fundamental frequency automatic identification method and system based on a harmonic product spectrum, and relates to the technical field of structure monitoring, and the method comprises the steps: receiving vibration acceleration data of an inhaul cable, carrying out the windowing processing of the vibration acceleration data through employing a Hanning window, and generating a windowed signal; carrying out fast Fourier transform on the windowed signal, and improving the frequency resolution by implementing zero filling to obtain an initial frequency spectrum; smoothing the initial frequency spectrum to form a smooth frequency spectrum; performing passband clipping on the smooth frequency spectrum to zero the passband outer amplitude to form a clipped frequency spectrum; calculating the signal-to-noise ratio of the frequency spectrum after cutting, and comparing the signal-to-noise ratio with a preset threshold value; if the signal-to-noise ratio is lower than a preset threshold value, judging that the signal quality is unqualified and terminating the processing flow; and if the signal-to-noise ratio is equal to or higher than the preset threshold value, continuing the normal processing flow. According to the invention, automatic and high-precision identification of the self-vibration fundamental frequency of the inhaul cable can be realized.

Methods and systems for mitigating the effects of defects in a quantum processor are provided. A mitigation system includes a quantum processor comprising a plurality of qubits. The system includes a light emitting source that can be tuned to produce light pulses of different wavelengths. The system includes an array of bandpass filters. Each bandpass filter is aligned with a qubit on the quantum processor and has a unique pass band. The system may include a controller configured to receive a selection of a qubit and to tune the light emitting source to emit a light pulse having a wavelength that falls within a range of a bandpass filter that is aligned with the selected qubit. The light pulse is used to scramble an ensemble of strongly coupled two-level system (TLS) in the processor.

The invention relates to a wide-temperature-range stable dual-band infrared optical filter for an extreme environment and a preparation method thereof. The wide-temperature-range stable dual-band infrared optical filter comprises a front film system, a substrate and a back film system, the front film system and the back film system are formed by alternately overlapping germanium layers and zinc sulfide film layers; the drift distance of the central wavelength of the passband of the infrared optical filter is less than 0.05% within the temperature range of-120 DEG C to + 85 DEG C. According to the invention, the internal stress of the film layer is obviously reduced through the optimized film system design, so that the excellent stability of the optical performance in an extreme temperature environment is realized, the technical problem that some special infrared spectrum detection systems work in a wide temperature range is solved, and a reliable solution is provided for high-end aerospace infrared application.

The invention provides a dielectric waveguide filter, a construction method and a dielectric waveguide duplexer. The construction method of the dielectric waveguide filter comprises the following steps: selecting a dielectric material based on a given target passband index; establishing a matrix four-mode dielectric waveguide resonator, and adjusting the size of a rectangular dielectric waveguide to enable the resonant mode frequency to reach a target frequency band; carrying out electromagnetic field distribution analysis on a single four-mode dielectric waveguide resonator with a set size, positioning the distribution position of a resonance mode according to the distribution condition of an electromagnetic field, and respectively embedding four blind holes in the position where the electromagnetic field is strongest in distribution so as to realize polarization fixation and frequency regulation and control on the resonance mode; selecting a coupling topology to construct a dielectric filter based on frequency regulation and control of the four-mode dielectric waveguide resonator; the additional coupling blind holes are added on the basis of the coupling topological structure so as to regulate and control the mutual coupling between the adjacent resonators. According to the technical scheme, the problem that the size of a filter in the prior art is large is effectively solved.

A sensor module for Raman spectroscopy includes a sensor package which encloses an application specific integrated circuit (ASIC), a light emitter arrangement, a light detector arrangement and a filter arrangement. The light emitter arrangement is electrically connected to the ASIC and operable to emit light with multiple excitation wavelengths to excite Raman scattering in an external probe to be placed outside of the sensor module. The light detector arrangement is operable to generate sensor signals from incident light emitted back from the external probe due to the Raman scattering. The filter arrangement is operable to filter the incident light according to a target passband. The ASIC is operable to drive the light emitter arrangement at the excitation wavelengths to shift a Raman spectral band of the external probe into the passband of the filter arrangement.

An electronic device may include wireless circuitry having a first circuit, a second circuit, and an impedance matching network coupled between the first and second circuits. The impedance matching network can include a transformer having a primary coil and a secondary coil and a first feedforward resistor having a first terminal coupled to the primary coil and having a second terminal coupled to the secondary coil. The impedance matching network can further include a second feedforward resistor coupled between the primary coil and the secondary coil. The first and second feedforward resistors can be configured to provide a flat passband gain response for the impedance matching network.

A multi-band antenna includes a first column of radiating elements that are configured to operate in a first operating frequency band mounted on a reflecting plate; a second column of radiating elements that are configured to operate in a second operating frequency band mounted on the reflecting plate; a first fence and a second fence located on both sides of the reflecting plate that extend forward from the reflecting plate, where the first and second columns of radiating elements are arranged in between the first and second fences, the first fence and the second fence respectively comprise a frequency selective surface with a passband and a stopband, the passband covers at least the first operating frequency band, and the stopband covers at least the second operating frequency band.

The invention discloses a Ka-band broadband filtering antenna, which comprises a probe, a ground paving layer, and a first horizontal dielectric plate, a first radiation patch, a second horizontal dielectric plate and a second radiation patch which are arranged on the ground paving layer, and is characterized in that the first radiation patch is provided with a c-shaped groove, the c-shaped groove is internally provided with a circular groove, and the circular groove is internally provided with a pair of branches; one ends of the two branches are combined to form a combined end connected to the first radiation patch, and the other ends of the two branches are parallel and have a gap to form a parallel opening end; and the center of the second radiation patch is close to the combined end of the two branches on the first radiation patch and far away from the parallel opening ends of the two branches on the first radiation patch. According to the invention, through collaborative design of slotting and branch knot loading, a filtering structure is innovatively constructed. The core innovation lies in the collaborative design of the two filtering structures and the spread spectrum structure, and the filtering frequency domain and the passband width are remarkably improved. The method can be widely applied to the fields of base stations, national defense and military industry and the like.

The present application provides a filter having a passband partially overlapping at least a wavelength range of 800 nm to 1100 nm. The filter includes a filter stack alternately stacked by a hydrogenated silicon layer and a low refractive index layer. Each hydrogenated silicon layer has a refractive index greater than 3 in the wavelength range of 800 nm to 1100 nm and an extinction coefficient less than 0.0005 in the wavelength range of 800 nm to 1100 nm.

The invention discloses an underwater acoustic signal modulation mode identification method and a related device, and relates to the field of signal modulation mode identification in non-cooperative underwater acoustic communication, and the method comprises the steps: firstly obtaining an original passband signal, and processing the original passband signal to obtain an I-path complex signal and a Q-path complex signal; extracting spatial features of the I-path complex signal and the Q-path complex signal by using a residual convolutional network module to obtain a spatial feature sequence; then, a bidirectional gating circulation unit module is used for learning information of the spatial feature sequence from the front direction and the back direction respectively, and the information obtained through learning is spliced to obtain a time sequence feature vector; and performing feature mapping and classification on the time sequence feature vectors to obtain classification confidence coefficients of different modulation modes, and determining the modulation mode corresponding to the maximum classification confidence coefficient as a classification result. According to the invention, high-precision and automatic underwater acoustic signal modulation mode identification can be realized.

The invention provides an integrated passive band-pass filter. The integrated passive band-pass filter is provided with a symmetric structure region and an asymmetric structure region, the symmetric structure area is provided with a symmetric axis, structures in the symmetric structure area are symmetrically arranged, the symmetric axis penetrates through the asymmetric structure area, and the structures in the asymmetric structure area are asymmetrically arranged relative to the symmetric axis; comprising two first filtering units which are arranged in a symmetric structure area and are connected with input and output ports located at the same side of a symmetric axis; the two second filtering units are arranged in the symmetric structure area, and the second filtering units are connected with the first filtering units located on the same side of the symmetric axis; and the third filtering unit is at least partially arranged in the asymmetric structure area, and the third filtering unit is connected with the two second filtering units. According to the filter structure, the roll-off characteristic of the two sides of a passband is increased through the multi-order circuit design, the asymmetric structure is arranged in the middle of the structure, mutual interference of inductors and large occupied space are avoided, the symmetric structures on the two sides can be debugged and optimized at the same time, the debugging and optimization frequency can be reduced, and the design period is shortened.

A radio-frequency module includes one or more first electronic components disposed on one main surface and one or more second electronic components disposed on another main surface. The one or more first electronic components include at least one of a filter whose passband includes a first band, a switch connected to the filter, a power amplifier connected to the filter, and a switch connected to the filter. The one or more second electronic components include at least one of a filter whose passband includes a second band in which the frequency of a harmonic wave of a signal in the first band is included, a switch connected to the filter, a low-noise amplifier connected to the filter, and an inductor connected to a path that forms a connection between the first low-noise amplifier and an antenna connection terminal.

An ESA antenna includes a layer of filters between the layer of radiating elements and the ground layer. The filter layer obviates certain post processing steps. The filters define a passband at the operating range of the antenna and a stopband defined to prevent crosstalk or reduce known external interference. Each filter includes alternating cells of a resonator cell formed by two split ring resonators and a resonator cell formed by a complementary split ring resonator and a complementary patch / stub. A particular implementation of the filter defines an operating range around 23 gigahertz with a passband to stopband transition of less than 500 megahertz. Vias may connect the filter layer to a surface component layer with beamforming integrated circuits, bypassing the routing layer.

The invention relates to the technical field of oil and gas pipeline detection, in particular to a pipeline eddy current-magnetic leakage aliasing signal decoupling and processing method, which comprises the following steps: S101, collecting pipeline defect aliasing original signals by using a coil and a magneto-sensitive element; s102, performing frequency division through low-pass and band-pass filters, extracting direct-current and alternating-current high-frequency and low-frequency components, and inputting the components into a CNN model to extract peak values and defect type labels; s103, judging the direction and position of the defect: judging whether the defect is located in a near inner wall area or a far inner wall area of the pipeline wall according to a voltage signal of a detection coil when high and low frequency current is introduced into an excitation coil, and judging the position of the volume type defect in combination with a defect type label; and S104, establishing a correlation curve of various defects and the voltage signal intensity, comparing signal peak values, and calculating the actual depth of the defects through interpolation. According to the invention, only one coil is adopted for excitation, two detection methods of eddy current and magnetic flux leakage can be realized at the same time, the design size of the detector is reduced, and the trafficability of a complex pipeline is improved.

According to the electroencephalogram acquisition and signal processing system and the information processing method provided by the invention, the control module is arranged, so that an upper computer is prevented from directly interacting with massive electroencephalogram acquisition data, and a data processing transfer station and a temporary control core are provided, so that the processing efficiency of electroencephalogram signals is improved. Furthermore, the control module comprises a processing unit and a programmable logic unit, the programmable logic unit can control a plurality of acquisition front ends in parallel to realize high-sampling-rate and high-passband signal acquisition, and the processing unit plays a role in connection in the whole electroencephalogram acquisition and signal processing system and can help the upper computer to control and manage the programmable logic unit, so that the accuracy of the electroencephalogram acquisition and signal processing system is improved. And meanwhile, a part of functions which can be realized without continuous data transmission are shared. The control module is provided with a programmable logic unit and a processing unit to realize parallel operation of two independent threads, namely a control flow thread and a data flow thread, so that the control flow and the data flow of the whole system are separated, and the data processing efficiency and the stability of the system are improved.

The invention belongs to the technical field of microwave communication, and relates to a coaxial double-stop-band filter, which comprises an inner conductor, an outer conductor, an insulating medium body, a signal input port and a signal output port, and is characterized in that the inner conductor is coaxially sleeved in the outer conductor, and the insulating medium body is positioned between the inner conductor and the outer conductor; two ends of the inner conductor are respectively connected with signal connecting ends of the signal input port and the signal output port; the outer conductor comprises a metal cylinder, the two ends of the metal cylinder are fixedly connected with the signal input port and the signal output port respectively, two defected ground structures which are symmetrically distributed relative to the central plane of the outer conductor are arranged on the metal cylinder, and each defected ground structure comprises a first gap and three second gaps which are arranged in parallel at intervals. The length direction of the second gaps is parallel to the axial direction of the metal cylinder, and the three second gaps are communicated through the first gap. The dual-band interference suppression performance is excellent, the passband insertion loss is low, the structure is novel, the power capacity is large, and processing is easy.

The invention discloses a high-order digital decimation filter with a variable decimation multiple, which comprises a cascade comb filter used for downsampling and anti-aliasing filtering, filtering high-frequency components and obtaining low-frequency density signals, and a compensation filter connected to the output end of the cascade comb filter and used for compensating passband attenuation and performing double decimation on the signals, and the output end of the compensation filter is connected with a half-band filter for realizing third-stage signal extraction. The invention further discloses a filtering method of the high-order digital decimation filter with the variable decimation multiple. Aiming at the defects that a traditional single-stage FIR filter is high in hardware requirement, complex in design, high in filter order and not easy to implement and the like, and aiming at the defect that a CIC filter is insufficient in passband flatness, a CFIR compensation filter is used for compensation, and finally a half-band filter is used for frequency reduction.

The invention discloses a bearing fault diagnosis method and system based on a simulated physical neural network. The method comprises the following steps: S1, preprocessing a collected vibration signal to obtain a to-be-diagnosed signal; s2, executing a hybrid optimization algorithm to obtain an optimal transmission band parameter and an optimal weight parameter; s3, configuring a feature extraction module according to the optimal transmission band parameter, and writing the optimal weight parameter into a classification module; s4, inputting the to-be-diagnosed signal into a feature extraction module to obtain a simulation feature vector; s5, inputting the simulation feature vector into a classification module, and outputting a classification voltage signal; and S6, determining a fault type, and outputting a result. According to the method, a hybrid optimization algorithm is adopted, the ratio of the inter-class dispersion degree to the intra-class polymerization degree of the feature vectors is calculated, optimal adaptation of feature extraction and classification tasks is achieved, and the diagnosis precision and generalization ability are improved; by constructing a full analog domain signal processing architecture, analog-to-digital conversion and digital calculation are not needed, and microwatt-level power consumption and microsecond-level real-time response are realized.

An electronic device may include wireless circuitry having a first circuit, a second circuit, and an impedance matching network coupled between the first and second circuits. The impedance matching network can include a transformer having a primary coil and a secondary coil and a first feedforward resistor having a first terminal coupled to the primary coil and having a second terminal coupled to the secondary coil. The impedance matching network can further include a second feedforward resistor coupled between the primary coil and the secondary coil. The first and second feedforward resistors can be configured to provide a flat passband gain response for the impedance matching network.

The invention discloses an ultra-wideband miniaturized band-pass filter based on slot lines and defected ground resonators, which belongs to the technical field of communication and comprises three metal layers, two dielectric layers and metal holes. The three metal layers comprise a top metal layer, a middle metal layer and a bottom metal layer from top to bottom, and the bottom metal layer is a ground plane; the metal holes penetrate through the three metal layers and the two dielectric layers; the two dielectric layers comprise a first dielectric layer and a second dielectric layer, the first dielectric layer is located between the top metal layer and the middle metal layer, and the second dielectric layer is located between the middle metal layer and the bottom metal layer; the top metal layer comprises a CPW feeder line and a slot line resonator, and LPUs are embedded in the CPW feeder line; the middle metal layer comprises a DGS resonator; and the slot line resonator and the DGS resonator are electromagnetically coupled to form a passband together. According to the invention, ultra wide band and miniaturization are realized through coupling of the slot line and the defected ground resonator.

Techniques for performing readout and reset of fluxonium qubits are disclosed. When fluxonium hardware components are coupled to a quantum metamaterial through a readout resonator, said components may be dispersively coupled such that a quantum state of the corresponding fluxonium qubit is read out through the quantum metamaterial, and then the state of the fluxonium qubit is subsequently reset in order to proceed with a quantum computation to be performed. Alternatively, when fluxonium hardware components are coupled directly to a quantum metamaterial, a quantum state of a fluxonium qubit is read out using resonance fluorescence, and then may be subsequently reset back to its ground state, also using resonance fluorescence. A width of a passband of the quantum metamaterial, along with frequencies of the control sequences used, may be tuned such that either readout or reset is selectively activated.

This invention discloses an infrared narrow-band passband and wide-cutoff-band high-optical-density filter based on a CaF2 substrate. It comprises a front film system and a back film system designed on both sides of the CaF2 substrate, with each film system consisting of alternating deposits of Ge and ZnS. The front film system is: 0.762(0.5HL0.5H)^M1 + 1.246(0.5LH.5L)^M2; the back film system is: 0.56(0.5HL0.5H)^M3 + 0.39(0.5HL0.5H)^M4 + 0.28(0.5HL0.5H)^M5 + 0.2(0.5HL0.5H)^M6L. The resulting filter, when tested with a spectrometer, achieves a cutoff bandwidth of 1000nm-7100nm and 8500nm-20000nm, with an average cutoff optical density reaching OD4; the transmission band of 7669±120nm has an average transmittance of 98.85%, and a half-wavelength of 470nm±30nm.

The invention provides a nonlinear ultrasonic detection method and device based on a photonic crystal, and relates to the technical field of nonlinear ultrasonic detection.The photonic crystal structurally comprises rectangular protrusions and a main board, and the upper surface and the lower surface of the main board are each provided with a plurality of identical rectangular protrusions periodically arranged in the transverse direction; primitive cells of the phononic crystal are formed by symmetrically attaching rectangular protrusions to the upper surface and the lower surface of a main board, and the method comprises the steps that the energy band structure of phonons and crystals is calculated through a constructed finite element model of the primitive cells of the phononic crystal, and the passband range and the forbidden band range of the phononic crystal are analyzed; in nonlinear ultrasonic detection of damage of a material, the photonic crystal is attached to the material, propagation of second harmonics generated nonlinearly by a system is prevented through a forbidden band range, and fundamental waves pass through a passband range. Therefore, through the attached photonic crystal, the nonlinear wave of the system is effectively filtered to reduce the influence of nonlinear ultrasonic detection, and the accuracy and sensitivity of the nonlinear ultrasonic detection are improved.

The invention discloses a small-sized wide instantaneous bandwidth radio frequency receiving front-end SiP module based on an HTCC, and belongs to the technical field of microwaves and radio frequency. The radio frequency receiving front end is realized on the basis of an SiP module of the HTCC, the mirror image frequency is far away from the radio frequency signal frequency spectrum through a high local oscillator dual-frequency conversion mode, and the spurious component generated by frequency mixing is moved to a high-frequency area outside an intermediate-frequency passband, so that wide instantaneous bandwidth and high spurious suppression are realized. According to the invention, miniaturization of the SiP module is realized based on the HTCC technology; a secondary frequency conversion superheterodyne circuit architecture and a high local oscillator design are combined, so that the instantaneous working bandwidth is widened to 4GHz, and meanwhile, high spurious suppression is realized; in addition, the vertical interconnection structure is improved, long-distance low-loss transmission of radio-frequency signals is achieved, and the size is further reduced. The ultra-wideband low-noise amplifier has the advantages of miniaturization, wide instantaneous bandwidth, low noise amplification and high spurious suppression, and a solution is provided for miniaturization and low-cost mass production of an ultra-wideband radio frequency system.

The invention discloses a power control method and device and related equipment, and belongs to the technical field of communication. The method is applied to the electronic equipment, the electronic equipment comprises a radio frequency link, and the radio frequency link comprises a power amplifier, a filter and an antenna port which are connected in sequence; the method comprises the steps that the working frequency of an antenna port and the first reference frequency corresponding to the frequency band range to which the working frequency belongs are acquired, and the first reference frequency is the passband edge frequency of a filter; determining a target frequency interval according to the first reference frequency, and adjusting the transmitting power of the power amplifier to be the maximum transmitting power under the condition that the working frequency is in the target frequency interval; or determining the target transmitting power of the antenna port according to the first reference frequency, and adjusting the transmitting power of the power amplifier according to the target transmitting power.

The invention relates to the technical field of power supply ripple test, in particular to a high-precision ripple test method of a high-voltage power supply, the high-voltage power supply and a system, and the method comprises the steps: collecting a ripple signal and a voltage sequence of the high-voltage power supply; performing instability analysis, feature point detection and difference features before and after curve fitting on the voltage sequence to obtain an unstable feature value of the voltage sequence, and obtaining a voltage fluctuation noise factor of the ripple signal in combination with an energy distribution condition and a frequency distribution condition of the ripple signal on a frequency domain; and according to the difference between the extreme value of the ripple signal frequency and the ripple signal center frequency, combining the voltage fluctuation noise factor to obtain a final passband bandwidth, and designing a band-pass filter to filter the ripple signal to obtain a ripple test result of the high-voltage power supply. The invention aims to remove the noise generated by unstable fluctuation of the voltage in the ripple signal and improve the accuracy of the high-voltage power supply ripple test.

The application provides a single-layer three-passband terahertz filter metamaterial, which comprises a metamaterial sheet layer and a plurality of artificial microstructures arranged in an array in the metamaterial sheet layer, each artificial microstructure and a corresponding part of the metamaterial sheet layer are defined as a metamaterial unit together, each metamaterial sheet layer can be regarded as being arranged by the array of the metamaterial units, when electromagnetic waves enter the metamaterial, the artificial microstructures are coupled to enable the metamaterial to reflect electromagnetic waves of other frequencies by reflecting terahertz wave bands of three specific frequency ranges, namely, the metamaterial is equivalent to a three-passband terahertz filter, and the application demand of different terahertz frequency bands can be met; in addition, compared with traditional metal-dielectric and metal-dielectric-metal filter metamaterials, the metamaterial composed of only a single metamaterial sheet layer has the advantages of light weight, low price and easy processing, the metamaterial can greatly reduce the processing difficulty of designing and processing terahertz devices, and is beneficial to the development of terahertz technology.

The application relates to the technical field of tunable N-path filter, in particular to a tunable N-path reflection-free filter and a superheterodyne receiver. The tunable N-path reflection-free filter comprises a signal source, an N-path band-pass filter unit, an N-path band-stop filter unit, an output resistor and a phase-splitting clock generating circuit. The output end of the signal source is connected with one end of the N-path band-pass filter unit and the N-path band-stop filter unit respectively, the other end of the N-path band-stop filter unit is connected with the output resistor, the gate of a plurality of MOS switches in the N-path band-pass filter unit and the N-path band-stop filter unit is connected with the phase-splitting clock generating circuit, and the phase-splitting clock generating circuit outputs a control signal. The tunable N-path reflection-free filter provided by the application has excellent frequency selectivity, can effectively suppress high-order harmonics, and can adjust the passband and the stopband by changing the switching frequency. Meanwhile, the filter can eliminate the reflected signal, prevent the intermodulation interference and gain fluctuation of the mixer and the high-gain amplifier in the system.