345 results about "Stopband" patented technology

The invention relates to the technical field of wireless communication, in particular to a wide-stop-band filtering coupler based on a rectangular coaxial structure, which comprises a rectangular coaxial outer conductor upper cavity, an inner conductor circuit and a rectangular coaxial outer conductor lower cavity, and is characterized in that the inner conductor circuit is arranged between the rectangular coaxial outer conductor upper cavity and the rectangular coaxial outer conductor lower cavity through a medium supporting block; the inner conductor circuit comprises an input port, a straight-through port, a coupling port, an isolation port and a branch line coupler structure. Four ports of the branch line coupler structure are respectively in coupling connection with the input port, the straight-through port, the coupling port and the isolation port through a quarter-wavelength open-circuit parallel coupling line structure. The novel rectangular coaxial transmission line is adopted for design, so that the circuit has the advantages of the rectangular coaxial metal transmission line, the electromagnetic shielding structure enables the circuit not to be easily interfered by external electromagnetic wave signals, and the rectangular coaxial transmission line can control the impedance requirement by changing the proportion of the inner conductor and the outer conductor according to different design requirements.

The invention relates to the technical field of frequency conversion, in particular to a radio frequency microwave signal modulation method and system, and the method comprises the following steps: detecting the ratio of the time domain peak interval to the frequency domain main sideband energy of a radio frequency signal, inputting the time domain peak interval and the frequency domain main sideband energy into a cross-correlation algorithm for synchronism analysis, extracting the periodic characteristics of a time domain peak sequence, and obtaining a frequency domain peak sequence; and generating an energy coupling factor based on a difference operation result of the frequency domain energy density gradient value and the time domain peak interval. According to the method, periodic characteristics are analyzed and extracted through the ratio of peak spacing to main sideband energy to generate an energy coupling factor, a main frequency point offset and an energy tilt vector are fused to generate a harmonic tendency parameter, an interference source path is positioned by combining a frequency trajectory vector, and disturbance levels are divided by clustering energy and harmonic parameters. And a conflict direction is pre-judged and stop band parameters are pre-loaded by grey prediction of a main sideband frequency difference value trend, and a closed-loop regulation and control system is constructed to improve the anti-drift capability and reduce the spectrum conflict risk.

An IPD high-selectivity band-pass filter based on a weak coupling transformer technology comprises an LC parallel resonance circuit, an LC series resonance circuit, an LC parallel resonance circuit and a fourth capacitor C4, and inductors in the LC parallel resonance circuit and inductors in the LC parallel resonance circuit have a weak transformer coupling relation; the coupling coefficient required by the weak coupling transformer provided by the invention is very small and can be realized in a mode of adjacently placing metals on the same layer, so that the structural complexity of the filter is effectively reduced; the band-pass filter is based on an IPD technology, an extra decoupling equivalent inductor is introduced through a weak transformer coupling technology, the extra decoupling equivalent inductor and a parallel capacitor which is connected between the input end and the output end of the filter in a bridging mode form a new resonance path, and a transmission zero point is introduced into an upper stop band and a lower stop band of the filter respectively to improve the selectivity of the filter. According to the invention, the selectivity of the filter can be effectively improved on the premise of not additionally introducing an inductance element and not increasing the order of the filter.

The present invention relates to the field of electronic devices of wireless communication systems. Disclosed is an ultra-wideband and high-protection-efficiency filtering energy selective surface, comprising one or more layers of reflecting surfaces; each reflecting surface is mainly composed of a plurality of metal sheets which are located on the same plane, have the same shape and are arranged in central symmetry; a gap for electrical isolation is formed between every two adjacent metal sheets; each gap is provided with a PIN diode; the anodes and cathodes of all the PIN diodes are arranged in a clockwise or counterclockwise direction; and all the gaps form an interconnected gap structure on the plane where the reflecting surface is located. The ultra-wideband and high-protection-efficiency filtering energy selective surface can be achieved by a first-order filtering energy selective surface unit or a second-order filtering energy selective surface unit. The filtering energy selective surface of the present invention has a small surface thickness and a simple structure, can achieve fast roll-off filtering for low-power signals, achieve an ultra-wide suppression stopband, and achieve ultra-wideband and high-efficiency protection for high-power electromagnetic waves.

The invention discloses a broadband reflection-free filtering antenna which is provided with a stop-band energy absorption structure, a high-low impedance microstrip line and a yagi-like radiator which are connected in sequence. The yagi-like radiator is composed of a pair of dipole arms and two pairs of bilateral parallel parasitic patches. Wherein the stop-band energy absorption structure is composed of two microstrip line band-stop filters, two grounded chip resistors, a section of folded phase line and a section of input microstrip feeder line. The two microstrip band-stop filters are respectively connected with a grounded chip resistor, and the two microstrip band-stop filters are connected through a folding phase line. The antenna is high in structural compactness, and meanwhile, the integrated design of the filter and the antenna and the ultra-wide non-reflection bandwidth are realized.

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 discloses a broadband millimeter wave magnetoelectric dipole filtering antenna unit and a filtering array, the antenna is realized by adopting a multi-layer printed circuit board, and the antenna comprises a radiation layer printed circuit board and a feed layer printed circuit board. The radiation layer printed circuit board is provided with a magnetoelectric dipole radiator, and an electric dipole patch etched with an H-shaped gap reduces the size of the radiator while achieving low-frequency good filtering. A substrate integrated waveguide (SIW) cavity is arranged around the magnetoelectric dipole radiator, so that surface waves are suppressed, and the overall suppression effect of a stop band is enhanced. A strip line fed by a coaxial probe and a shielding SIW cavity structure are integrated on a feed layer printed circuit board, and the feed structure generates two radiation zero points at high frequency, so that good filtering response is realized. The antenna provided by the invention has the advantages of wide frequency band, small size, high out-of-band rejection level and frequency selectivity.

The invention provides an on-chip terahertz band-pass filter based on an artificial surface plasmon high-order mode, and the on-chip terahertz band-pass filter comprises a dielectric substrate, a feed microstrip line, a first transition structure, a short-branch artificial surface plasmon transmission region, a second transition structure, and a long-branch artificial surface plasmon transmission region. Feed microstrip lines are arranged at the two ends of the front face of the dielectric substrate respectively, each feed microstrip line is sequentially connected with a first transition structure, a short-branch artificial surface plasmon transmission area and a second transition structure, and a long-branch artificial surface plasmon transmission area is located in the middle of the front face of the dielectric substrate. Two ends of the long branch artificial surface plasmon transmission region are respectively connected with a second transition structure, and the whole back surface of the dielectric substrate is covered with a metal layer as a metal ground; the wide-stop-band microstrip antenna has the advantages of being wide in stop band, easy to machine, small in transmission loss and small in crosstalk, does not need punching operation, and is convenient to machine.

The invention provides a filtering patch antenna based on three-dimensional packaging integration, which mainly comprises five layers of dielectric substrates, four layers of bonding plates and an integral circuit structure, the whole circuit structure comprises a signal transmission metal column, a coupling strip line, a quarter-wavelength strip line resonator, an open-circuit strip line branch knot, a feed strip line, a microstrip patch, a grounding metal column and a grounding plate. The novel filtering antenna provided by the invention has the characteristics of high integration level, miniaturization, high selectivity, wide stop band and packaging, and can be well applied to the field of wireless communication systems.

The invention discloses a multi-band filter S parameter testing method and system based on segmented scanning, and relates to the technical field of radio frequency microwave testing. The method comprises the following steps: controlling a digital channel board card to drive a radio frequency switch through an upper computer, expanding radio frequency ports of a vector network analyzer, and enabling the number of the radio frequency ports to be matched with that of filter ports to be tested; test channels are divided according to the number of filter ports and test requirements, a segmentation parameter table and calibration parameters are configured for each channel, the segmentation parameter table comprises sub-segment scanning parameters, and the number of sub-segment scanning points is adjusted according to passband and stopband characteristics; the vector network analyzer performs segmented scanning on each channel based on the parameters; and the upper computer obtains the S parameter curve from the vector network analyzer to complete the test. The method can improve the S parameter testing efficiency and precision of the multi-band filter, and is suitable for mass production testing.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The disclosure provides a method and a device for filtering-based channel estimation. A method comprises configuring a filter design with a stopband region between at least two bandpass regions in a time domain associated with channel behavior, suppressing, via the filter design, multi-user interference (MUI) or orthogonal cover code (OCC) interference in the time domain, and providing frequency domain-based channel estimation (CE) based on the filter design.

The invention discloses a stop-band residual compensation method and device of a digital filter, a storage medium and a computer program product, and relates to the technical field of audio signal processing, and the method comprises the steps: collecting an original audio signal and a digital filtering signal; the digital filtering signal and the original audio signal are synchronously input into a pre-constructed stop-band residual noise dynamic compensation model to be processed, a smooth transition signal is obtained, and the stop-band residual noise dynamic compensation model takes a hardware filtering signal output by a hardware simulation filter as a target label; and superposing the smooth transition signal and the digital filtering signal according to a preset superposition proportion to obtain a calibration signal. The stop-band residual noise dynamic compensation model learns smooth transition characteristics when the hardware simulation filter reproduces parameter adjustment, and the flexibility of the digital filter is considered, so that the response speed when the digital filter adjusts the cut-off frequency in real time at high frequency is improved, and the stop-band residual energy at the moment of cut-off frequency adjustment is inhibited.

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.

A method and device for filtering-based channel estimation. A method comprises configuring a filter design with a stopband region between at least two bandpass regions in a time domain associated with channel behavior, suppressing, via the filter design, multi-user interference (MUI) or orthogonal cover code (OCC) interference in the time domain, and providing frequency domain-based channel estimation (CE) based on the filter design.

The invention provides a cavity filter, and relates to the technical field of filters. The cavity filter comprises a shell part, the shell part is constructed to form a first cavity and a second cavity, and a first coupling window is constructed between the first cavity and the second cavity. Wherein the first cavity is internally provided with a 1 / 4 wavelength resonance unit, and the second cavity is internally provided with a first coupling resonance unit and a second coupling resonance unit which are symmetrically arranged about the longitudinal center plane of the second cavity. The 1 / 4 wavelength resonance unit comprises a first cylinder and a second cylinder which are coaxially arranged, and the diameter of the first cylinder is larger than that of the second cylinder. The first coupling resonance unit comprises a first resonance part and a second resonance part, and the impedance of the first resonance part is larger than that of the second resonance part. The second coupling resonance unit comprises a third resonance part and a fourth resonance part, and the impedance of the third resonance part is larger than that of the fourth resonance part. The cavity filter provided by the invention has the advantages of wide stop band and miniaturization.

The invention discloses an ultrahigh-scanning-rate leaky-wave antenna based on double-layer offset quasi-complementary SSPP. The antenna comprises a dielectric substrate, double-layer single-side offset quasi-complementary SSPP structures on the upper surface and the lower surface of the dielectric substrate, a double-layer mode conversion structure and a dielectric substrate top layer periodic modulation branch knot. Wherein the longitudinal symmetry axis of the dielectric substrate top layer single-side strip SSPP unit and the longitudinal symmetry axis of the dielectric substrate bottom layer single-side slot SSPP unit are relatively offset, and a double-layer single-side offset quasi-complementary SSPP unit is jointly formed; the double-layer mode conversion structure is composed of a trapezoidal gradual change structure on the top layer of the dielectric substrate and a periodic gradual change slotting structure on the bottom layer of the dielectric substrate; and the dielectric substrate top layer periodic modulation branch knot is formed by compounding a rectangular structure and a semicircular structure loaded at the tail end of the rectangular structure, and is positioned on the opposite side of the top layer single-side strip SSPP structure. The wide-angle scanning ultra-narrow band-pass filter has the advantages of wide-angle scanning, ultra-narrow working bandwidth, ultra-high beam scanning rate and open stop-band suppression, and has very high practical potential in the fields of radar, imaging and the like.

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 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.

A micro-acoustic RF filter comprises first and second ports (101, 102). First and a second signal paths (120, 110) are coupled between the first and second ports and include a corresponding resonator (111, 121). The resonator of at least one of the signal paths is a micro-acoustic resonator. One of the signal paths includes also a phase shifter (232) serially connected with the resonator (111). The micro-acoustic RF filter achieves a broad passband determined by the resonance frequencies of the micro-acoustic resonators. The filter allows flexible adaption of the passband and stopband performance.

A switching converter controller includes: a stopband controller having a stopband controller input and a stopband controller output, the stopband controller is configured to provide stopband information at the stopband controller output responsive to a reference signal; a pulse-frequency modulation (PFM) controller having a first PFM controller input, a second PFM controller input and a PFM controller output, the first PFM controller input configured to receive a feedback error signal, the second PFM controller input coupled to the stopband controller output, and the PFM controller configured to selectively adjust a clock signal at the PFM controller output based on the feedback error signal and the stopband information; and a driver circuit having a driver circuit input coupled to the PFM controller output and configured to receive the clock signal, and having a driver circuit output adapted to be coupled to a power stage switch.

The invention relates to the technical field of terahertz wave application, in particular to a terahertz low-pass filter based on a frequency selective surface, which comprises a first dielectric layer, a second dielectric layer, a third dielectric layer, a first metal layer and a second metal layer. The first dielectric layer, the second dielectric layer and the third dielectric layer are stacked in sequence; the first metal layer is arranged on the surfaces of the first dielectric layer and the third dielectric layer, and the first metal layer is formed by arranging four metal sheets in a square shape; the second metal layer is arranged between the first dielectric layer and the second dielectric layer and between the second dielectric layer and the third dielectric layer, and the second metal layer is of an annular structure with a through hole. According to the terahertz wave filter, the filtering effect on terahertz waves can be achieved, the working frequency band can cover a microwave band and a terahertz band, the cut-off frequency of the terahertz wave filter can be regulated and controlled, and the cut-off frequency range of the terahertz wave filter is 0.01-1 THz; the device is simple in structure and low in preparation difficulty; the band-pass filter has high transmissivity in a passband, and has a good stop-band suppression characteristic at a high frequency.

The present invention provides a method for designing a pass-stopband response weighted constrained adaptive spatial filter, which belongs to the field of array signal processing technology. The present invention performs weighted constraints on the passband response error and constrains the stopband response at the same time, so that the overall output response is minimized. By designing a spatial filter through an optimization problem and converting it into a solution to the optimization problem, the optimal solution of the filter is obtained mathematically. The filter design described in the present invention is highly efficient and has a wide range of applications. It can suppress interference signals of various spatial incident models and can achieve a balance in the response errors in all directions of the passband.

The invention relates to the technical field of communication, in particular to a miniaturized wide-passband filter based on an EMSIW and a microstrip resonator. According to the miniaturized wide-passband filter, the two EMSIW cavities are adopted, the size of the filter can be effectively reduced, high-order modes TE120, TE210, TE220 and TE130 cannot be propagated in the EMSIW cavities, and therefore the filter has a wide stop band. Two microstrip resonators are embedded at a coupling window between two EMSIW cavities, and four-order quasi-elliptical filtering response is realized under the condition that no extra circuit area is occupied. Compared with other EMSIW filters, the filter has the advantages of being small in size, wide in passband, wide in stop band and good in selectivity, and has potential application value in a communication system.

The invention discloses a reflection type polarization conversion antenna with an adjustable stop band, which works in an X wave band and is composed of a dielectric substrate, a metal resonance structure layer arranged on one side of the dielectric substrate and a metal reflection layer arranged on the other side of the dielectric substrate, and the metal resonance structure layer comprises two groups of mutually nested symmetrical split circular ring resonance units. Through the technical means of translation, parameter adjustment and the like, the two groups of resonance units generate symmetry difference, so that different resonance units generate mutually counteracted surface current responses at a specific frequency, and a stop band for polarization conversion suppression is formed in a continuous working frequency band; the position and suppression intensity of the stop band can be controlled by adjusting the structural parameters of each resonance unit. While broadband high-efficiency polarization conversion is realized, a tunable narrowband polarization conversion zero point is introduced, and the tunable narrowband polarization conversion zero point has the advantages of simple structure, high regulation degree of freedom and good incident angle stability, and is suitable for communication, radar and signal monitoring systems of millimeter wave and microwave frequency bands.

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.

This invention discloses a miniaturized, wide-stopband low-pass filter design method, covering 3D model design, simulation optimization, circuit fabrication and testing, and design verification based on dielectric integrated suspension line technology. The core of the low-pass filter design is based on dielectric integrated suspension line technology. Furthermore, the core circuit of this filter employs three layers of surface-mount capacitors and a double-layer spiral inductor to reduce circuit size, while combining a honeycomb structure to extend the stopband. Compared to traditional circuit designs, the implemented filter exhibits self-encapsulation characteristics, achieving low insertion loss and an ultra-wide stopband range, providing an important basis for filter performance optimization.

The invention provides a frequency hopping band elimination filter which comprises a coaxial resonant cavity, a metal resonant column arranged in the coaxial resonant cavity and a digital capacitor array used for frequency tuning. The digital capacitor array comprises a plurality of capacitor chip sets, each capacitor chip set comprises a plurality of capacitor chips, each capacitor chip comprises an upper electrode and a lower electrode which are oppositely arranged, the lower electrodes are directly welded on the end surfaces of the metal resonant columns, the upper electrodes are connected with bonding wires, and the bonding wires are connected with the metal resonant columns. The bonding wire is used for being electrically connected with a control circuit. The digital capacitor is connected with the metal resonance column and the control circuit in a direct welding and gold wire bonding mode, lower and more stable insertion loss is achieved in the aspect of electrical performance, and extremely high connection consistency is ensured in the aspect of mechanical reliability; and a solid physical foundation is laid for the frequency hopping stop-band filter to realize high-Q-value, high-precision and high-reliability frequency tuning in the S wave band.

A filter manufacturing method and a filter manufactured by the filter manufacturing method are disclosed. The filter manufacturing method includes designating a use mode in a resonator to a first resonance mode, in response to designating to the first resonance mode, setting a band selected from a designated first frequency band to a passband in the resonator, switching the use mode in the resonator from the first resonance mode to a second resonator mode, in response to switching to the second resonance mode, setting a band selected from the first frequency band except for the passband to a stopband in the resonator, and manufacturing a primary filter including the resonator to which the passband and the stopband are set.

The invention relates to the technical field of intelligent sensors, in particular to an intelligent inclination angle sensing system and method with low power consumption, high precision and high sensitivity. According to the system, a multi-element sensing assembly is used for synchronously sensing MEMS core and shell double-source temperature, environment acceleration and composite inclination angle signals; the inclination angle signal calculation and error compensation unit executes physical signal conditioning, and filters dynamic vibration noise through frequency domain stop band suppression; a zero drift compensator is adopted, non-linear evolution characteristics of long-term creep errors are reconstructed according to a temperature historical reference sequence, the zero drift distance is calibrated in real time, and reference correction is carried out on an inclination angle signal; and the measurement state management unit monitors amplitude overrun and triggers reporting. Through the multi-source physical error decoupling and zero position self-calibration mechanism, the long-term stable maintenance of the inclination angle measurement basis and the accurate acquisition of the gravity vector in the field environment are realized.

The present application relates to filter device, multiplexer and communication device, provide the filter device of multi-band response with wide band and low loss passband, wide band stopband and narrow band and steep stopband. The filter (1) has: input and output terminal (100, 110);LC parallel resonant circuit (10) has inductor (L1) and capacitor (C1) connected in parallel with each other;And elastic wave series resonant circuit, have series arm resonator (s1, s2) connected in series with each other, LC parallel resonant circuit (10) and elastic wave series resonant circuit are connected in series between input and output terminal (100) and input and output terminal (110).