73 results about "Rf field" patented technology

The invention relates to the field of electromagnetic field technology and radio frequency signal testing, in particular to a radio frequency standard field generation system and method based on near-field beam forming, and the system comprises a control unit, a radio frequency signal generation unit, a radio frequency field control unit and a broadband radiation antenna array. The control unit carries a near-field electromagnetic wave synthesis mathematical model and is used for receiving a target field type setting requirement and calculating excitation amplitude and injection compensation phase required by each radiation unit configured in the broadband radiation antenna array; the radio frequency signal generation unit comprises a pulse modulation laser source and a plurality of semiconductor radiation units and is used for generating high-power programmable radio frequency signals; the radio frequency field control unit comprises an optical delay line and an FPGA matrix and is used for performing amplitude and phase regulation and control on the high-power programmable radio frequency signal output by the radio frequency signal generation unit; and the broadband radiation antenna array is used for receiving the regulated radio frequency signal and radiating the regulated radio frequency signal to the near-field space of the darkroom, and a target field pattern is formed through multi-unit electric field vector superposition.

This specification provides a circuit unit for implementing near field communication and an NFC device. The solution includes an NFC antenna, an NFC chip, and an excitation circuit, where the NFC antenna is connected to the NFC chip, the NFC chip is connected to the excitation circuit, and the NFC chip is configured to: obtain first energy in a case that the NFC antenna senses a radio frequency field of a user terminal device, and provide a part of the first energy to the excitation circuit; and the excitation circuit is configured to generate and send an excitation signal by using energy obtained from the NFC chip, wherein the excitation signal is used to excite the user terminal device to communicate with a device comprising the circuit unit.

The invention discloses a microwave measurement and control device, and relates to the technical field of particle acceleration. The antenna comprises a backboard, a radio frequency unit and a tuning unit. The backboard is provided with a high-speed serial transmission channel; the radio frequency unit is connected with the backboard to collect radio frequency field state data of the accelerator cavity; the tuning unit is connected with the backboard to output a driving signal to adjust the resonant frequency of the cavity. Wherein the radio frequency unit and the tuning unit establish a direct connection link through a high-speed serial transmission channel, and the tuning unit cooperatively adjusts the resonant frequency of the cavity according to radio frequency field state data. A traditional CPCI architecture is optimized through the backboard, the high-speed serial transmission channel comprises the first communication channel, radio frequency field state data does not need to be transferred and is directly transmitted to the tuning unit through the high-broadband and high-performance first communication channel, the problems of large transmission delay and cooperative lagging caused by bandwidth sharing of an existing CPCI architecture are effectively solved, and the communication performance of the CPCI architecture is improved. Tuning can be rapidly carried out through closed-loop control, and the stability of the accelerator beam is remarkably improved.

The present application discloses a payment method and system, and a related apparatus. The method comprises: after entering a radio frequency field of a collection device, receiving a first payment request sent by the collection device, wherein the first payment request comprises a first amount and an identifier of one or more payment modes supported by the collection device; on the basis of the first payment request, determining a first payment mode from among the one or more payment modes supported by the collection device; and completing payment by means of the first payment mode. In this way, an electronic device can complete payment by means of a touch with the collection device, thereby simplifying payment steps and improving payment efficiency.

The application discloses a power supply field service smart cabin intelligent management and control method and system based on multi-source fusion, relates to the technical field of electric power Internet of Things and smart operation and maintenance, and comprises the following steps: triggering RFID batch scanning through radio frequency field micro disturbance, and performing time sequence consistency verification on the scanning result to obtain tool unique identification information and current in-place state data; collecting environment data in the smart cabin, time aligning and fusing the environment data and the tool in-place state data in an event-driven mode to generate a multi-source perception data set; performing health state analysis on the tool according to the multi-source perception data set, optimizing the storage position and access path of the tool according to the analysis result, and outputting a tool storage and taking scheduling strategy; and the application solves the problems of low tool state perception accuracy, poor multi-source data fusion quality, inability to identify health evolution trend and unreasonable storage path optimization in the power supply field service smart cabin.

The invention provides a high-precision microwave electric field intensity measurement system and method based on CTC phase change, and belongs to the technical field of microwave measurement. Comprising a quantum sensing unit, an optical excitation and detection module, a microwave regulation and scanning module, an auxiliary radio frequency field module and a signal processing and control center. The method comprises the following steps: S1, preliminary preparation of Rydberg-state atoms; s2, preparing CTC phase atoms; s3, identifying a phase change critical point; and S4, measuring and calculating microwave electric field intensity measurement sensitivity improvement at the phase change critical point. According to the invention, a Rideburg system is prepared to a CTC phase change critical point area which is extremely sensitive to electric field intensity change response, and high-precision measurement of microwave electric field intensity is completed by using the extremely high gain of the system to an electric field intensity change signal at the moment.

The invention provides a tire pressure monitoring data direct-reading method, device and system based on passive NFC (Near Field Communication), and the method comprises the following steps: a tire pressure monitoring device enters a radio frequency field coverage range generated by an external intelligent terminal, a power management chip in the device converts a formed unstable direct-current voltage into a constant working voltage to supply power to the device, and after the device is electrified, the power management chip supplies power to the tire pressure monitoring device; tire pressure monitoring data of a tire corresponding to an installation position is collected, the collected tire pressure monitoring data is packaged into a uniform resource locator (URL) containing query parameters, the URL is written into an NFC storage area of the device and is read by an external intelligent terminal, and the external intelligent terminal is directly triggered to call a web browser of a system based on a protocol format of the URL. According to the device, power is supplied through passive NFC radio frequency, and the tire pressure monitoring data are output in a uniform resource locator mode, so that the device can achieve real-time collection, transmission and direct reading display of the tire pressure monitoring data under the condition that a battery and a special application program are not needed.

The invention relates to a near field communication method and device. The first device operates in a card mode and includes an NFC controller. The second device operates in a reader mode. In an NFC communication method, a first device exits an observer mode when an NFC controller receives content of a captured radio frequency field sequence.

The utility model relates to a radio-frequency excitation control device for tumor hypoxia research, which comprises a mounting frame, a radio-frequency signal excitation module is mounted on the upper side of the left part of the mounting frame, a radio-frequency signal control module is mounted on the upper side of the right part of the mounting frame, and the radio-frequency signal control module is electrically connected with the radio-frequency signal excitation module. An electric push rod is mounted on the right side of the mounting frame, a lifting table is connected to the telescopic end of the electric push rod, a radio frequency coil is connected to the lifting table, and the radio frequency coil is also electrically connected with the radio frequency signal control module. The electric push rod drives the lifting platform to vertically move, the radio frequency coil is driven to accurately adjust to a target height, and a radio frequency field uniformly covers a sample area, so that test requirements of samples of different specifications are met, an electromagnetic environment is closed by the protective frame, test safety is favorably improved, influence of electromagnetic diffusion on the test is prevented, and test efficiency is improved. Meanwhile, an operator can observe the test condition in real time through the transparent structure in the middle of the protective frame.

The present teachings generally relate to generating a pseudo-barrier via an axial RF field. A first voltage is applied to a first pair of rods arranged in a multi-pole configuration, a second RF voltage is applied to a second pair of rods, and a difference between magnitudes and / or phases of the first and second RF voltages is adjusted. As discussed in more detail herein, such a pseudo-barrier may be employed in a variety of different applications. As an example, such a pseudo-barrier may be used to trap ions within a rod group that includes a plurality of rods arranged in a multi-pole configuration. In other applications, adjusting the height of the pseudo-potential barrier established in the rod set along with the application of a DC potential between the rod set and an external electrode can be used to cause mass-selective extraction of ions trapped within the rod set. In other applications, such a pseudo-barrier may be employed in a multiplexing method to perform mass spectrometry.

This application discloses a high-precision microwave frequency measurement method and system based on continuous-time crystal phase transitions, belonging to the field of quantum sensing technology. This method utilizes the characteristic of the Rydberg atom system at the critical point of a continuous-time crystal phase transition where the response slope of the detected light transmission signal to the microwave frequency is significantly enhanced, breaking through the resolution limit of traditional linear responses. The system includes a quantum sensing unit, an optical excitation and detection module, a microwave modulation and scanning module, an auxiliary radio frequency field module, and a signal processing and control center. By precisely adjusting the parameters, the system is driven to the vicinity of the critical point, the critical frequency is identified, and its high response slope is used to achieve precise frequency measurement. This invention employs a two-stage measurement process, balancing wide dynamic range and high precision, and can be flexibly tuned to adapt to different frequency bands, possessing broad application prospects, especially in microwave communication, frequency metrology, and other fields with significant technical value.

Disclosed in the present application are a ticket checking method and system, and a related apparatus. The method is applied to a first electronic device, on which a first account has been logged in to. The method comprises: after entering a radio-frequency field of a gate, receiving a first item identifier sent by the gate; on the basis of the first item identifier, determining a first opening identifier (OpenID), wherein the first OpenID is generated on the basis of the first item identifier and the first account, and the first OpenID is used for the gate to verify whether the first account logged in to on the first electronic device has a permission to open the gate; and sending a first response to the gate, wherein the first response comprises the first OpenID. In this way, the first electronic device can complete ticket checking by means of touching the gate, thereby simplifying steps of ticket checking, improving the efficiency of ticket checking, and bringing a better experience for users.

Apparatuses and methods for accelerating charged particles include an accelerator. The accelerator includes a cavity comprising a chamber and conductive walls enclosing the chamber, and having one or more inlets and one or more outlets, an electro-magnet substantially surrounding at least a portion of the cavity; two or more rods disposed predominantly longitudinally within the chamber; and one or more RF couplers. The RF couplers are configured to generate a rotating or non-rotating dipole radio frequency field within the cavity by exciting the RF couplers in phase to accelerate the charged particles entering the cavity through the one or more inlets. The radio frequency field operates predominantly in transverse electromagnetic mode.

This invention provides a radio frequency field characteristic testing device and method. A linear slide bar, a magnetic scale, and a motor are all fixed on a scanning chassis. The linear slide bar and the magnetic scale are placed side by side. A slider slides on the linear slide bar, and a receiving antenna is mounted on the slider via an adapter. The magnetic head of the magnetic scale is mounted on the slider, and the magnetic scale measures the displacement of the receiving antenna. The motor drives the receiving antenna to move. One end of a cylinder is located on the bottom surface of the scanning chassis away from the linear slide bar, and the cylinder has the function of extending and retracting in a direction perpendicular to the normal of the scanning chassis. The other end of the cylinder is located on a connecting flange, which is fixed to the inner frame of the turntable. This invention differs from the standard gain horn of the scanning bracket. This invention uses a small circularly polarized antenna and makes full use of the turntable's own rolling axis structure. The linear guide bar and the rotation of the turntable form a planar scan. The structure is relatively simple and compact, and it is suitable for measuring the electromagnetic field characteristics in the quiet zone of a hardware-in-the-loop simulation system.

A radio frequency (RF) drying apparatus is provided. The RF drying apparatus includes: a drying chamber including a grounding body and a roller, the grounding body surrounding N (N≥3) electrodes for generating an RF field, and the roller being electrically insulated from the electrodes; and a processor configured to, in an active mode, periodically select and activate M (M<N) electrodes from the N electrodes, deactivate one or more of the remaining (N-M) electrodes, select M (M<N) electrodes for activation to generate an AC signal, and deactivate (N-M) electrodes to inactive state so as not to generate an AC signal; and form an RF field inside the drying chamber based on the generated AC signal.

Provided in the embodiments of the present application are an NFC polling method, an NFC system and a related apparatus. When an NFC card reading device supports a first NFC protocol and a second NFC protocol, the NFC card reading device may be enabled to transmit card search requests of the first NFC protocol and card search requests of the second NFC protocol within each of a plurality of polling duration periods in an order of a card search request of the first NFC protocol, a card search request of the second NFC protocol, a card search request of the first NFC protocol and a card search request of the second NFC protocol. When an NFC apparatus supports the first NFC protocol and the second NFC protocol, after entering a radio frequency field, the NFC apparatus may preferentially choose to reply to the NFC card reading device with a card search response of the first NFC protocol, such that the NFC card reading device and the NFC apparatus preferentially choose the first NFC protocol to perform NFC interaction.

The present application relates to the technical field of communications. Disclosed are a ticket checking method and system, and a related apparatus. The method is applied to a first electronic device, wherein a first electronic device is logged in with a first account. The method comprises: after entering a radio-frequency field of a gate machine, receiving a first authentication request sent by the gate machine, wherein the first authentication request comprises a first random number and a first identifier of the gate machine; on the basis of the first identifier, determining a first order token; on the basis of the first order token and the first random number, determining first authentication information; and sending a first authentication response to the gate machine, wherein the first authentication response comprises the first authentication information and the first random number. In this way, a first electronic device can use a preset encryption algorithm model to encrypt a first order token on the basis of a first random number, and send to a gate machine first authentication information obtained after encryption, such that the security of a ticket checking process can be improved.

A mass spectrometer comprises: a first ion optical device in a relatively low gas pressure region; a second ion optical device in a relatively high gas pressure region, the first and second ion optical devices receiving respective RF voltages from respective RF power supplies for generating respective RF fields that confine ions in respective trapping regions of the ion optical devices; and a gas conductance restriction, restricting gas flow from the relatively high gas pressure region to the relatively low gas pressure region, the gas conductance restriction having an aperture to allow ions to pass from the second to the first ion optical device. The first and second RF power supplies are independent to allow the RF voltages for generating the first RF field to have a different amplitude from the RF voltages for generating the second RF field.

The invention provides a pulse laser pumping cesium atom magnetometer and a measuring method. The magnetometer comprises a physical probe part and a circuit part. The physical probe comprises a VCSEL laser, an optical element, a cesium atom absorption gas chamber, a radio frequency coil and a photoelectric detector; the circuit part comprises a photoelectric conversion circuit, a differential amplification circuit and a radio frequency excitation circuit. The method comprises the following steps: carrying out optical pumping on cesium atoms by adopting pulse laser, inducing magnetic resonance through a radio frequency field, detecting precession signals by utilizing a time division multiplexing mechanism, forming self-oscillation through differential amplification and feedback, and calculating the external magnetic field intensity through oscillation frequency. The invention further provides a scheme for adaptively switching between a high-sensitivity working mode and a wide-bandwidth working mode based on the change degree of a magnetic field measurement value and a scheme for accumulatively detecting a magnetic field for mobile platform application. The invention has the characteristics of high sensitivity, large bandwidth, small volume and low power consumption, and is suitable for geomagnetic field and magnetic field measurement in a wider range.

The invention discloses a radio frequency processing circuit, a radio frequency processing device and communication equipment, relates to the field of radio frequency, and is used for reducing the size and cost of the radio frequency processing circuit. The radio frequency processing circuit comprises a first transmission line, a first end of the first transmission line is coupled to a first port of the radio frequency processing circuit, and a first adjusting circuit is coupled between a second end of the first transmission line and a second port of the radio frequency processing circuit. The length of the first transmission line is smaller than one fourth of the wavelength corresponding to a to-be-transmitted radio frequency signal of the radio frequency processing circuit. The first end of the second transmission line is coupled to the first port of the radio frequency processing circuit, and a second adjusting circuit is coupled between the second end of the second transmission line and the third port of the radio frequency processing circuit. And the length of the second transmission line is smaller than one fourth of the wavelength corresponding to a to-be-transmitted radio frequency signal of the radio frequency processing circuit. An isolation circuit is coupled between the second end of the first transmission line and the second end of the second transmission line.

The invention provides an NFC card adding method and a related device. After entering a radio frequency field generated by the NFC card reading equipment, the electronic equipment receives a first command sent by the NFC card reading equipment through NFC, and the first command carries equipment feature information of the NFC card reading equipment. And the electronic equipment sends a second command to the NFC card reading equipment through NFC, wherein the second command is used for indicating that the electronic equipment does not open the NFC card matched with the NFC card reading equipment. And the electronic equipment receives a third command sent by the NFC card reading equipment through NFC. And the electronic equipment sends a fourth command to the NFC card reading equipment through NFC, wherein the fourth command carries the first verification information of the electronic equipment. And if the first verification information is used for indicating that the electronic equipment has the card opening permission, the electronic equipment receives first card information sent by the NFC card reading equipment through NFC, and opens the first NFC card based on the first card information. Therefore, the electronic equipment can be quickly and conveniently opened.

A transmitter of an RFID communication system to transmit an amplitude modulated transmitter data signal in resonance in an RF-Field over the air and to receive a modulated receiver data signal, which transmitter comprises: a transmitter stage to generate the amplitude modulated transmitter data signal with a particular frequency and waveform based on a carrier signal generated by a carrier signal stage; an antenna connected to the transmitter stage via a matching circuit to transmit the amplitude modulated transmitter data signal in resonance in the RF-Field over the air; a receiver stage connected via the matching circuit to the antenna to receive the modulated receiver data signal; wherein the transmitter furthermore comprises a wave shape measurement stage to measure the shape of the received modulated receiver data signal with equivalent time sampling.

The invention relates to a near-field communication method and device, electronic equipment and a storage medium, the near-field communication method is applied to a receiving end of near-field communication, and the near-field communication method comprises the following steps: when the pulse width of a radio frequency field transmitted by a transmitting end of near-field communication is smaller than a preset pulse width, acquiring a historical time point when the transmitting end transmits the radio frequency field; acquiring a calibration time interval of the transmitting terminal for transmitting the radio frequency field; and determining a starting time point of the near field communication module of the receiving end according to the calibration time interval and the historical time point so as to receive the next radio frequency field transmitted by the transmitting end.

This application provides a method and related apparatus for switching near-field communication (NFC) analog cards. An electronic device activates a first NFC analog card. The electronic device is then powered off. After entering the radio frequency field of an NFC card reader, the electronic device switches to and activates a second NFC analog card when specified switching conditions are met. This allows users to switch the activated NFC analog card, improving the speed and efficiency of NFC card swiping. Furthermore, the user can switch the activated NFC analog card even when the electronic device is powered off, making it suitable for more card-swiping scenarios.

To provide a circuit unit and a near field communication (NFC) device for achieving near field communication.SOLUTION: The circuit unit 300 includes an NFC antenna 301, an NFC chip 302, and an exciting circuit 303, where the NFC antenna 301 is connected to the NFC chip 302, and the NFC302 chip is connected to the exciting circuit 303. The NFC chip 302 is configured to obtain first energy when the NFC antenna 301 senses a radio frequency field of a user terminal device, and provide a part of the first energy to the excitation circuit 303, the excitation circuit 303 is configured to generate and emit an excitation signal by using the energy obtained from the NFC chip 302, and the excitation signal is configured to excite the user terminal device to communicate with a device including the circuit unit 300.SELECTED DRAWING: Figure 3

The application relates to an InAs / AlSb heterojunction type radio frequency field effect transistor device and a preparation method thereof. The device comprises a GaAs substrate, an AlGaSb buffer layer, a p-type GaSb interlayer, a lower barrier layer, an InAs channel layer, an upper barrier layer, an InAlAs hole blocking layer, an InAs cap layer, a source electrode, a drain electrode and a gate electrode. The GaAs substrate, the AlGaSb buffer layer, the p-type GaSb interlayer, the lower barrier layer, the InAs channel layer, the upper barrier layer and the InAlAs hole blocking layer are stacked in sequence. The source electrode and the drain electrode are both located on the InAs cap layer and are spaced apart by a certain distance. The InAs cap layer is provided with a gate slot, the gate slot is located between the source electrode and the drain electrode and on the InAlAs hole blocking layer, and the gate electrode is located in the gate slot. In the radio frequency field effect transistor device, the p-type GaSb interlayer is inserted between the AlGaSb buffer layer and the lower barrier layer, the p-type GaSb interlayer can eliminate some holes caused by the collision ionization effect, inhibit the movement of the holes in the direction of the substrate, thereby improving the direct current characteristics of the device and improving the performance of the device.

The invention discloses a radio frequency assisted freezing system which comprises a radio frequency generation module, a radio frequency processing module, a low-temperature freezing module and an optical fiber temperature measurement module, the radio frequency generation module can provide stable pulse radio frequency signals and comprises a radio frequency generator, a relay pulse generator and an impedance matcher, and the relay pulse generator and the impedance matcher are electrically connected with the radio frequency generator. The radio frequency processing module is used for providing a radio frequency action space for food and comprises a radio frequency processing device, the low-temperature freezing module can provide freezing cooling capacity for the system and comprises a low-temperature refrigerator, the impedance matcher and the radio frequency processing device are arranged in the low-temperature refrigerator, and the optical fiber temperature measuring module is arranged on the outer side of the low-temperature refrigerator; and the optical fiber temperature measurement module is used for accurately monitoring the food temperature. Through the synergistic effect of the radio frequency field and low-temperature freezing, the crystallization process of water molecules in the food can be effectively interfered, the food is promoted to generate an obvious supercooling phenomenon, a large number of ice nucleuses are formed at the temperature lower than the freezing point in an explosive mode finally, and the final quality of the frozen food is greatly improved.

Methods and devices to improve the switching speed of radio frequency FET switch stacks are disclosed. The described methods and devices are based on bypassing drain-sources resistors when the FET switch stack is transitioning from an ON to an OFF state. Several implementations of the disclosed teachings are also presented.

A first device operates in card mode and includes an NFC controller. A second device operates in reader mode. In an NFC communication method, the first device exits an observer mode on reception by the NFC controller of content of a captured sequence of a radio frequency field.

Various examples are provided related to bimodal electron paramagnetic resonance (EPR). In one example, a bimodal resonator includes a detection coil; first and second excitation coils, where the excitation coils are non-parallel separated by a fixed angle; and excitation controllers coupled to the first and second excitation coils. The excitation controllers can adjust radio frequency (RF) fields generated by the first and second excitation coils to produce a resonator field substantially parallel with the detection coil. In another example, a method including generating a first RF field by exciting the first excitation coil; generating a second RF field by exciting the second excitation coil; and producing a resonator field substantially parallel with a detection coil of the bimodal resonator by adjusting the RE field of the first excitation coil, the RF filed of the second excitation coil, or both.