235 results about "Signal reflection" patented technology

The invention relates to the technical field of FPC (Flexible Printed Circuit) laminated structure optimization, in particular to a module FPC laminated structure optimization system based on signal integrity, which comprises a laminated parameter sensitivity extraction module used for defining the thickness of a dielectric layer, the thickness of a copper foil and a dielectric constant as closed interval values with upper and lower boundaries according to FPC design specifications. According to the method, the accumulated deviation area and the normalized confidence score are obtained in combination with integral operation, conversion from a frequency domain to a time domain and from qualitative analysis to quantitative evaluation is achieved, tiny flaws of impedance continuity are captured, inferior paths are screened based on the confidence score, and a physical junction area is positioned. The geometric gravity center of the deviation area is calculated to be matched with the slope and the length of the gradient line, a smoothly-transited geometric figure is constructed, structural compensation can be achieved in areas where impedance is prone to sudden change such as a reinforcing plate junction and covering film pressing, and signal reflection caused by physical sudden change of a stacked structure is eliminated.

The invention discloses an impedance matching method and system for chip testing, electronic equipment and a medium, and relates to the technical field of data processing. The method comprises the following steps: establishing electrical connection between a test probe and a to-be-tested chip test point, and sending a preset detection signal; acquiring incident power and reflection power of the detection signal; calculating a first signal reflection coefficient based on the incident power and the reflection power, and determining an impedance deviation value and an adjustment direction according to a difference value between the first signal reflection coefficient and a preset standard reflection coefficient; determining a parameter adjustment step length according to the impedance deviation value; sequentially adjusting a variable resistor, a variable capacitor and a variable inductor in the impedance matching network according to the step length and the adjusting direction; detecting a second signal reflection coefficient when the impedance real part and imaginary part of the variable element reach the target range; and judging whether the second signal reflection coefficient converges to a preset range, and if yes, taking the current matching network parameter as an impedance matching result. By implementing the technical scheme provided by the invention, the impedance matching accuracy of the chip test can be improved.

The utility model discloses a signal receiving device for communication technology, which comprises a base and a signal reflecting plate, one side of the signal reflecting plate is fixedly connected with a signal receiver, the base is connected with the signal reflecting plate through an adjusting device, the adjusting device comprises a support, the bottom end of the support is fixedly connected with a plurality of groove drums, and the groove drums are arranged in the support. According to the utility model, through the arrangement of the adjusting device, the supporting column is connected with the signal reflecting plate through the supporting seat, so that the supporting seat and the signal reflecting plate can be pushed to rotate when the pressing ring moves upwards to be far away from the interior of the base; the orientation angle of the signal reflecting plate can be adjusted by pulling the telescopic rod to control the screw rod to move on the inner wall of the support, so that the orientation angle and the inclination angle of the signal reflecting plate are adjusted, the convenience and the flexibility of the signal receiving device during use are improved, and the signal receiving device is applied to the technical field of signal receiving devices.

The application relates to the technical field of radio frequency antennas, in particular to a radio frequency antenna regulation and control device and method based on a low-dimensional semiconductor material, which comprises a flexible PCB substrate, a low-dimensional semiconductor radio frequency transistor arranged on the flexible PCB substrate, a dual-frequency antenna structure arranged on the flexible PCB substrate, the dual-frequency antenna structure comprising a fundamental frequency antenna and a harmonic antenna, a plurality of gold wire bonds, a gate terminal of the transistor being connected to the fundamental frequency antenna, and a source terminal being connected to a ground return circuit of the flexible PCB substrate, and an open-circuit matching branch arranged in the dual-frequency antenna structure, which is used for realizing impedance matching at a fundamental frequency point and a second harmonic frequency point. Through the above technical scheme, low-dimensional semiconductor radio frequency transistor and dual-frequency antenna are connected in a low-loss mode, high-frequency signal transmission stability is improved, the collaborative work of fundamental frequency signal receiving and second harmonic signal radiation is completed, the dual-frequency impedance matching effect is improved, parasitic parameters and signal reflection are reduced, and the device can reliably work under flexible deformation.

The invention provides a coaxial-coplanar waveguide broadband matching structure for a millimeter wave frequency band and an installation method. The coaxial-coplanar waveguide broadband matching structure for the millimeter wave frequency band comprises a coaxial plane center line structure, a coaxial plane coplanar gradient line structure and a coaxial plane coplanar waveguide structure which are sequentially arranged in the millimeter wave propagation direction, and the coaxial plane center line structure is fixedly connected with the coaxial plane coplanar gradient line structure. The coaxial plane coplanar tapered line structure is fixedly connected with the coaxial plane coplanar waveguide structure; the coaxial plane center line structure is used for forming a sheet-shaped axisymmetric field force line; the coaxial plane coplanar gradual change line structure is used for realizing gradual change of a field force line; the coaxial plane coplanar waveguide structure is used for forming a specific field force line, the specific field force line enables an electric field to be emitted to the plane grounding layers on the two sides, and the magnetic field shrinks. According to the coaxial-coplanar waveguide broadband matching structure for the millimeter wave frequency band, signal reflection caused by interconnection of the coaxial structure and the coplanar waveguide can be reduced, and impedance mutation is avoided.

The application relates to the field of antennas and discloses an ultra-wideband omnidirectional antenna and a detection device. The ultra-wideband omnidirectional antenna comprises a conical conductive structure, a grounding conductive structure, a feeding structure and a signal reflection structure. The grounding conductive structure comprises a connecting surface. The top end of the conical conductive structure is connected to the connecting surface of the grounding conductive structure, and the axis of the conical conductive structure is perpendicular to the end surface of the grounding conductive structure. The grounding conductive structure comprises a high-frequency signal end and a low-frequency signal end. The distance from the high-frequency signal end to the top end of the conical conductive structure is smaller than the distance from the low-frequency signal end to the top end of the conical conductive structure. The feeding structure is electrically connected to the top end of the conical conductive structure. The signal reflection structure is connected to the end surface of the grounding conductive structure where the grounding conductive structure is connected to the conical conductive structure, and the signal reflection structure is arranged between the high-frequency signal end and the top end of the conical conductive structure. Through the arrangement, the ultra-wideband omnidirectional antenna can generate gain for radio signals of a lower frequency.

The invention relates to the technical field of communication, discloses a dynamic impedance matching method and system for a radio frequency switch and an attenuator, and aims to solve the technical problems that signal reflection is increased, insertion loss is increased and system performance is reduced due to the fact that a traditional fixed impedance matching network cannot adapt to port impedance change during state switching of the radio frequency switch and the attenuator. The method comprises the following steps: monitoring control signal changes of a radio frequency switch and an attenuator in real time, and generating a state identification code representing a current working state; and taking the identification code as an index, and retrieving a corresponding optimal tunable network control parameter from a pre-stored calibration parameter lookup table. By means of the scheme, rapid and accurate impedance matching can be achieved under all working state combinations, reflection loss and insertion loss are remarkably reduced, signal integrity and linearity are improved, and the overall performance and environmental adaptability of the system under broadband and multi-state application are improved.

This invention discloses a TDR-based system and method for measuring the thickness of multilayer dielectric materials, relating to the field of microwave testing technology, enabling thickness measurement of multilayer dielectric materials in a non-destructive environment. The system includes: a vector network analyzer, an antenna module, and a metal calibration plate. The vector network analyzer emits microwave pulses at a set frequency to the multilayer dielectric material under test. The antenna module focuses the reflected waves generated by the microwave pulses as they pass through the multilayer dielectric material. The metal calibration plate is placed on the starting layer of the multilayer dielectric material to generate the first corresponding time-domain signal reflection peak when the microwave pulse is incident, thus locating the starting position of the multilayer dielectric material. The vector network analyzer also acquires the frequency-domain signal focused by the antenna module, performs a Fast Fourier Transform on the frequency-domain signal to obtain a time-domain signal, calculates the time-domain signal based on the starting position, and outputs the thickness parameters of each layer in the multilayer dielectric material under test.

The invention discloses a positioning method, a positioning system and a vehicle, when a target object is positioned, a first electromagnetic wave signal subjected to phase agility is emitted, a first echo signal reflected based on the first electromagnetic wave signal is received, and positioning operation is performed on the target object according to the first electromagnetic wave signal and the first echo signal. According to the positioning method, the angle resolution of angle positioning of the target object can be improved, meanwhile, angle ambiguity is not generated, and then the positioning precision of angle positioning is improved.

This invention discloses a multi-channel programmable miniaturized high-speed FBG demodulation system and method based on an AWG (Optical Fiber Optic Generator), belonging to the field of fiber optic sensing technology. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation system includes a high-stability broadband light source module, a low-loss isolation module, a miniaturized programmable fiber optic amplifier, a circulator, a two-stage miniaturized high-speed optical switch, a high-crosstalk AWG module, a photoelectric conversion module, a programmable A / D conversion module, and a core control module. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation method involves the optical signal entering an FBG sensor array, the FBG sensor reflecting the optical signal, the reflected optical signal entering the AWG module, and the output light undergoing photoelectric conversion to calculate the center wavelength of the FBG sensor. This invention, based on an AWG, improves demodulation accuracy while ensuring the demodulation range, achieving continuous wavelength demodulation within the AWG wavelength range.

The invention discloses a method and system for controlling a robot to return to a base station, the robot and the base station, and relates to the technical field of smart home. According to the method for controlling the robot to return to the base station, whether a near-field signal can be received or not is judged when the relative movement distance of the robot is not larger than the farthest coverage distance of the near-field signal; and the original signal / reflected signal identification of the returned guide signal is realized. When the near-field signal cannot be received, the received signal is a reflected signal of the returned guide signal, the robot cannot return to the vicinity of the base station, and the posture of the robot needs to be adjusted to receive an original signal of the returned guide signal; and when the near-field signal can be received, the robot normally returns to the vicinity of the base station and can move to the docking position of the base station according to the guidance of the near-field signal. By identifying the original signal / reflected signal of the returned guide signal, the robot is intelligently guided to the base station, and the autonomy and intelligence of charging and returning of the robot are improved.

The invention belongs to the technical field of synthetic aperture radars, and discloses a high mountain and valley region-oriented SAR corner reflector arrangement method, which realizes accurate positioning and installation angle optimization of an SAR corner reflector by introducing an MDDG model and an R index evaluation index and combining GNSS high-precision positioning and R-D equation iterative optimization, and improves the positioning accuracy of the SAR corner reflector. High spatial precision and long-term stability of InSAR monitoring are ensured; according to the method, after the SAR corner reflector is installed, the installation angle is optimized through RCS time sequence analysis and UAV image; according to the method, the installation stability, the signal reflection quality and the observation precision of the SAR reflector can be improved, the arrangement and positioning of the reflector can be optimized especially under complex terrain and environment conditions, and the problems of signal attenuation, shielding, positioning errors, signal aliasing and the like of the reflector in the prior art are solved.

The present disclosure is directed to a quantum processor system. The system includes a first cryogenic chamber, a signal reflecting element disposed within the first cryogenic chamber, a second cryogenic chamber, and a quantum device disposed in the second chamber. The signal reflecting element is configured to split an input signal into a first signal component and a second signal component. The system further includes a first signal line and a second signal line. The first signal line is configured to supply the input signal from an external environment to the signal reflecting element and to supply the reflected first signal component from the signal reflecting element to the external environment. The second signal line is configured to supply the transmitted second signal component from the signal reflecting element to the quantum device. The signal reflecting element electrically couples the first signal line to the second signal line.

The invention discloses a high-isolation low-loss filtering structure and method for a PCB strip line. According to the high-isolation low-loss filtering structure provided by the invention, the main transmission strip line, the filtering auxiliary strip line with the spur line structure and the grounding layer with the hollowed-out area are integrated in the PCB, so that external discrete filter elements and welding procedures and shielding separation cavities required by the external discrete filter elements are effectively omitted, and therefore, the size of a module is remarkably reduced; weight and complexity. Meanwhile, due to the integrated design, impedance discontinuity and signal reflection caused by the fact that signals are converted between the inner layer and the surface layer of the PCB through the via holes are avoided, and signal integrity is guaranteed. And finally, on the premise of not introducing additional elements, high-performance filtering is realized, and an effective solution is provided for miniaturization and high performance of the radio frequency front-end module.

A detection device includes a sound generator, an optical transmitter, a compound waveguide, an optical receiver, a processor, and a housing element. The sound generator generates a sound signal. The optical transmitter generates an incident light signal. The compound waveguide transmits the sound signal and the incident light signal to a human body portion. Thus, the human body portion transmits a reflected light signal back to the compound waveguide. The compound waveguide further generates a mixed light signal according to the incident light signal and the reflected light signal. The optical receiver receives the mixed light signal. The processor is coupled to the optical receiver. The processor obtains the physiological information of the human body portion according to the mixed light signal. The sound generator, the optical transmitter, the compound waveguide, the optical receiver, and the processor are disposed inside the housing element.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a responding device may receive a signal from an initiating device. The responding device may estimate, from the signal, a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps. The responding device may select one or more taps, from the multiple taps, that are within a first time window that starts at a first offset from a reference point and that has a first specified time duration. The responding device may transmit, to the initiating device, a CIR report that indicates the one or more taps. Numerous other aspects are described.

The embodiment of the application provides a printed circuit board, a preparation method thereof and electronic equipment, and belongs to the electronic field. The printed circuit board comprises an isolation substrate and a plurality of blind holes distributed on the surface of the printed circuit board; the blind holes comprise coaxial first blind holes, second blind holes and third blind holes; the aperture of the first blind hole is larger than the aperture of the third blind hole; and the isolation substrate comprises a base body and an insulating layer arranged on the surface of the base body. The printed circuit board is used to improve the filling density of the blind hole and the uniformity of the copper layer, thereby reducing signal reflection, crosstalk and transmission delay.

The technology described herein is directed towards automatically completing two-factor authentication for a user based on detection of a distinct metasurface of a wearable (or other) device associated with a user. The wearable device includes a passive metasurface that interacts with a transceiver coupled to a computing device, such as a personal computer or laptop. The transceiver transmits a wireless radio frequency signal towards the metasurface integrated into the wearable device, whereby the metasurface reflects an altered instance of the incoming signal back to the transceiver. The radiation pattern of the reflected signal is distinctly altered per metasurface, providing a distinct signature of that particular metasurface that can be detected by a computing device expecting that signature. The receipt of an expected, matched signal's signature at the computing device authenticates the user, whereby the computing device operates to automatically complete the two-factor authentication request on the user's behalf.

The utility model relates to the technical field of electronic equipment, in particular to a camera module capable of preventing signal interference, which comprises a PCB (printed circuit board) and a fixed base, and is characterized in that the fixed base is positioned above the PCB and is fixedly connected with the PCB, a lens component is arranged on the fixed base, a sensing component is arranged on the surface of the PCB, and the lens component is positioned above the PCB. The lens assembly comprises a lens body, a wide angle and a protective cover, through cooperative use of the above structures, signal attenuation is reduced, a USB interface is close to the edge, connection with external equipment is facilitated, the integrity of USB signals is ensured through reasonable wiring layout, and for high-speed signals such as a camera image data transmission line, the data transmission efficiency is improved. A differential wiring mode is adopted, and the wiring length and spacing are strictly controlled so as to match impedance, reduce signal reflection, thicken power supply wiring, reduce line resistance, ensure the stability of power supply and reduce the power consumption of the camera.

Provided in the embodiments of the present disclosure is a vehicle-mounted antenna, comprising: at least two antenna elements, which are vertically arranged on a high-frequency printed circuit board; a phase-shifting feed network, which is fixed on the high-frequency printed circuit board, and is connected to each antenna element; and a first metal frame, which is arranged around the at least two antenna elements on the periphery of the high-frequency printed circuit board, and comprises a plurality of grid bars spaced apart and vertically arranged, wherein the surface of each grid bar that faces the antenna elements is formed as a signal reflection surface; the first metal frame comprises a first frame surface and a second frame surface, and the area of signal reflection surfaces of the first frame surface is greater than the area of signal reflection surfaces of the second frame surface; and a first preset angle is formed between the first frame surface and at least one antenna element, and a second preset angle is formed between the second frame surface and a corresponding antenna element, the second preset angle being different from the first preset angle. By means of the antenna, the gain characteristics of an elevation cut of the antenna can be adjusted, thereby achieving the effect of improving the gain of a low elevation cut of the antenna.

The utility model relates to heat stroke prevention technical field, and disclose a kind of temperature monitoring equipment testing device, including sealed cabin, temperature monitor and human body model, the inside of the sealed cabin is provided with detection assembly, the inside of the sealed cabin is provided with environmental component;The detection assembly includes reciprocating screw rod rotationally embedded in the inside of sealed cabin, and reciprocating screw rod is connected with threaded block by ball nut pair, the top of the threaded block outer surface is fixedly connected in human body model, the temperature monitor is fixedly connected in one side of sealed cabin inner wall, the both sides of the threaded block outer surface are fixedly connected with push block shaft;The utility model is aimed at solving the test of temperature monitoring device, scene restoration degree far cannot match actual use demand, the tracking ability and response speed of device when personnel are moving cannot be verified, and the sweating state of human body under high temperature environment leads to temperature measurement signal reflection or scattering, leads to the problem of the deviation of reading and real data.

The utility model provides a drill-bit-shaped tungsten alloy test piece. The drill-bit-shaped tungsten alloy inlaid test piece comprises a bottom plate; the supporting frame is fixedly connected to the top of the bottom plate, the top of the supporting frame is fixedly connected with a test board, and two mounting plates are mounted at the top of the test board. According to the test piece inlaid with the drill-bit-shaped tungsten alloy, through the design, the contact area is large, uniform contact pressure can be provided, contact resistance can be remarkably reduced through large-area contact, the stability of signal transmission is guaranteed, signal reflection or loss is reduced, the finger-shaped process is simple, the production cost is relatively low, and the test piece is suitable for popularization and application. Benefited from the drill-bit-shaped tungsten alloy head which is similar to a triangular structure and is stable, more stable strength is achieved in repeated tests, poor contact caused by breakage of the head tungsten alloy is avoided, and therefore the more stable and reliable contact effect is achieved.

The invention provides a method, a device, equipment, a medium and a product for positioning a target object in a vehicle, the method is applied to a single-station single transmit-receive antenna, and the method comprises the following steps: sending a preset satellite flash SLP signal, and receiving an echo signal formed by the reflection of the target object to the satellite flash SLP signal through the single-station single transmit-receive antenna; according to the echo signal, obtaining the distance between the target object and the single-station single transceiver antenna; comparing the distance between the target object and the single-station single-transmitting-receiving antenna with a preset distance interval range of each seat in the vehicle relative to the single-station single-transmitting-receiving antenna, and determining an alternative seat where the target object is located; acquiring a target signal-to-noise ratio corresponding to the target object under the condition that a plurality of alternative seats exist; and according to the target signal-to-noise ratio and the gain corresponding to each alternative seat, determining a target seat where the target object is located in the plurality of alternative seats. Therefore, the target position of the target object can be accurately identified.

The present application relates to a radio frequency system and a communication device. The radio frequency system may include: a transceiver circuit; a receiving circuit; a first coupling circuit, configured to support coupling of a transmit signal on a transceiver path and coupling of a reflected signal of the transmit signal, and output a first forward coupled signal and a first backward coupled signal; a second coupling circuit, configured to selectively turn on the receiving path and the coupling path, support coupling of the first forward coupled signal and coupling of the reflected signal, and output a second forward coupled signal and a second backward coupled signal; and, a processing circuit, configured to determine second impedance information of the receiving path according to the second forward coupled signal and the second backward coupled signal.

This application provides a method, apparatus, and device for left and right eye recognition. The method involves emitting a first signal at a first angle and a second signal at a second angle; receiving reflected signals, including a first reflected signal and a second reflected signal, where the first reflected signal is the signal reflected back from the first signal and the second reflected signal is the signal reflected back from the second signal; and determining whether the currently measured eye is the left or right eye based on the first and second reflected signals. Both the first and second signals are optical signals, or both are coded signals, where the coded signal is an optical signal carrying a code. Embodiments of this application can automatically identify the left and right eyes.

This utility model relates to the field of circuit board packaging technology, and in particular to a circuit board and a solid-state drive. The circuit board provided by this utility model sets high-speed differential line pairs as inner layer traces, and uses vias / through holes through the pads of the high-speed differential lines to electrically connect the high-speed connector and the controller. Since the vias / through holes only need to pass through the pads, the number of wiring layers through which the vias / through holes pass is greatly reduced, which makes it possible to use back drilling process to better reduce the number of residual posts and shorten the length of residual posts, effectively reduce signal reflection or crosstalk, and improve signal quality.

The utility model discloses a single-aperture feed circuit, a near field communication system and electronic equipment, and relates to the technical field of communication, and the single-aperture feed circuit comprises a first feed unit and a second feed unit; the first end of the first feed unit is connected with the NFC chip through the CDMP interface, the second end of the first feed unit is connected with the first end of the second feed unit, and the second end of the first feed unit is further connected with a single-port feed point of a target antenna through an antenna elastic piece; and the first feed unit and the second feed unit are used for enabling the NFC chip to obtain the change of the target antenna in real time through the CDMP interface, and dynamically adjusting the impedance in the NFC chip. Compared with the prior art, signal reflection and loss can be reduced, and user experience is improved.

The invention provides an FRIS-assisted physical layer security communication method and system, the physical layer security communication system comprises a base station and an FRIS, the surface available area of the FRIS is divided into a plurality of sub-areas, each sub-area comprises a plurality of reflection units, all the reflection units in each sub-area form a sub-array, and each sub-array comprises a plurality of reflection units. Only one reflection unit in each subarray is selected and activated, and the activated reflection unit is used as an activation unit for reflecting a transmission signal of the base station to a legal user; the method comprises the steps that an optimization problem is solved, the optimization problem takes maximization of the safety rate of a legal user as an optimization target, constant modulus constraint, phase shift discrete constraint and activation unit position constraint are taken as constraint conditions, and an activation unit position and a passive beam forming variable are obtained. Compared with the traditional RIS, the FRIS-assisted physical layer security communication method and system can significantly improve the PLS performance of the system, thereby improving the security communication level of the system.

This application relates to the field of basketball sports technology, and discloses a basketball shooting scoring system and an infrared sensing specular diffuse reflection detection method. The system includes: an infrared emitting module for emitting infrared signals; an infrared receiving module for receiving reflected infrared signals; a specular reflection structure module for reflecting the infrared beam at a preset angle; a data acquisition module for acquiring the state of the reflected light signal; a trajectory analysis module for generating spectral data; and a scoring output module for displaying the shooting score in real time. The method includes: infrared signal emission; infrared signal reception and disturbance data generation; signal reflection and interference region formation; path disturbance matrix generation; trajectory analysis and feature extraction; trajectory determination and scoring feedback; and data recording and result output. This invention adopts a design combining an infrared emitting module and an infrared receiving module, which can accurately construct an infrared light path and capture the trajectory of a basketball shot.

The invention provides a flexible wireless passive multi-mode sensing integrated acquisition method and system, and the method comprises the steps: carrying out the integrated preparation and manufacturing of a flexible antenna, a flexible chip and a multi-mode sensor, enabling a ring oscillator to start oscillation to generate a periodic waveform, and enabling a clock to generate a slow periodic signal after the frequency division of a counter; when the capacitor voltage of the multi-mode sensor reaches a set threshold value, counting is stopped, and a counting value is sent to a channel encoder for channel encoding through a single-slope ADC; the coded logic signal enters a modulation module after the current is amplified by a buffer, the modulated signal is reflected back to a reader, the signal is received, demodulated and extracted and then decoded, and a count value of the charging time and a clock signal are obtained; and acquiring a sensing physical quantity signal according to the count value of the charging time, and acquiring temperature information according to the clock signal. According to the technical scheme, the technical problems that in the prior art, a multimode integrated sensor is usually large in size, an external power source is needed for power supply, and the integration and intelligence degree is low are solved.