93 results about "Antenna impedance" patented technology

The invention discloses an optimization method of a butterfly-shaped UHF antenna, and the method comprises the following steps: determining a preset angle range of a semi-apex angle based on the matching relation between the characteristic impedance of the butterfly-shaped antenna and the working frequency band width, so as to achieve the stable change of the input impedance and the broadening of the frequency band; according to the wavelength of the low-frequency end of the working frequency band, a preset proportional relation between the arm length and the wavelength is established to determine the value of the arm length, so that the requirement of the antenna impedance bandwidth on low-frequency-band signal receiving is met; a butterfly antenna is arranged in a metal back cavity to form a back cavity type antenna, the height of the back cavity is determined according to the wavelength corresponding to the strongest frequency of a signal so as to suppress back radiation and enhance forward radiation gain, and systematic improvement of electromagnetic wave signal receiving performance is realized through collaborative optimization of structural parameters of the butterfly antenna and the back cavity.

The invention provides a WIFI antenna impedance matching parameter generation method and device, equipment and a storage medium, and relates to the field of radio frequency circuit design. The method comprises the steps of obtaining input parameters in response to input operation; determining an initialization optimization parameter according to the input parameter; wherein the input parameter is basic data used for generating the impedance matching parameter of the WIFI antenna. On the basis of a preset optimization algorithm and the initialized optimization parameters, executing an operation of globally searching for an optimal solution, and determining candidate element parameters; and according to a preset application resonance constraint condition, carrying out forced correction on the candidate element parameters. Determining fundamental frequency impedance according to the forcibly corrected candidate element parameters; and if it is determined that the fundamental frequency impedance meets a preset fundamental frequency impedance matching degree threshold, determining that the candidate element parameters are WIFI antenna impedance matching parameters. Therefore, the problems of low design efficiency and single optimization target in the prior art are solved.

A wireless earbud may have a head and a stalk. A speaker may be disposed in the head. An antenna may be disposed in the stalk. One or more radios may transmit a radio-frequency signal in high and low bands over high and low band arms of the antenna. A signal coupler may be coupled to the antenna. The signal may include scheduled transmission blocks and optionally unscheduled transmission blocks. A processor may measure impedance of the antenna in the high and low bands using the signal coupler and the transmitted signal. The processor may detect a gesture based on an order of changes in the impedance in the high and low bands. The processor may take suitable action based on the detected gesture. The gesture may include, for example, a volume up or down gesture in implementations where the high and low band arms extend parallel to the stalk.

The invention discloses a dual circularly polarized phased-array antenna based on triangular grid arrangement. A phased-array antenna module sub-array is formed by triangular grid arrangement of phased-array antenna units; the radiation unit adopts a cross oscillator with a gradual change structure, the impedance matching is improved, and a feed network of a three-branch linear bridge is matched, so that the impedance bandwidth of the antenna is improved, and the requirements of more communication frequency bands are met; the orthohexagonal antenna unit appearance and the metal partition wall are adopted, so that mutual coupling between the antenna units is reduced, and the isolation degree between the antenna units and the overall performance are improved; triangular grid arrangement is adopted, and the problems that the scanning range of a traditional rectangular array is limited, and grating lobes are prone to occurring during large-angle scanning are solved; the device has higher polarization purity and lower cross polarization level, supports quick splicing of N * N subarrays, and has the advantages of simple structure, low cost and easiness in processing.

This invention relates to a broadband high-gain radar antenna based on a metasurface and its applications, belonging to the field of antenna design. From top to bottom, it consists of a metasurface layer (Rogers RO3003C substrate + periodic ideal electrical conductor rectangular elements), an air cavity, a radiating layer (ideal electrical conductor patch with rectangular slots), a ground plane with rectangular slots, and a feed layer (microstrip line), operating near 12.4 GHz. The metasurface elements are optimized through characteristic mode analysis, the air cavity improves impedance matching, and the microstrip line is fed through the rectangular slots of the ground plane and the slots of the radiating layer. CST simulations show that the antenna has an impedance bandwidth of 1800 MHz in the 11.6–13.4 GHz range, a peak gain of 8.37 dBi, and a radiation efficiency of nearly 100%, making it suitable for millimeter-wave radar and providing new ideas for its miniaturization and high performance.

An antenna impedance matching design circuit includes a load circuit, a filter circuit and a matching circuit which are connected to each other. The load circuit is connected to one end of the filter circuit for connecting a near field communication chip, and the matching circuit includes a plurality of capacitors.

The utility model discloses an integrated communication antenna, relates to the technical field of communication antennas, and aims to provide an integrated communication antenna which is low in cost, convenient to produce and assemble, and not easy to be influenced by other antennas, and adopts an FR4 material single-sided or double-sided copper-clad PCB (printed circuit board) or FPC (flexible printed circuit) board with stable performance as a circuit board to be positioned at the top layer, and a loading capacitor board is positioned at the middle layer. The substrate attached to the bottom layer (shared with other antennas) and the loading capacitor plate are arranged at an idle position, the impedance of the communication antenna can be effectively adjusted while other antennas on the bottom layer are not affected, the communication antenna integrally adopts a longitudinal integration mode, the required longitudinal space is very small, and compared with a traditional transverse integration mode, the miniaturization requirement is easier to meet.

The system can have a circuit including an output, an electrical signal source electrically connected to the output, and a meter electrically connected to the output, the circuit having a characteristic impedance being fixed; and an antenna electrically connected to the output of the circuit for receiving the source signal, the antenna having a near field and an antenna impedance, the antenna impedance matching with the characteristic impedance of the circuit when driven by the source signal, when a region of interest of the living subject is within a near field of the antenna and when the antenna is electrically insulated from the region of interest.

An apparatus for wireless communication includes a processing system. The processing system includes one or more processors and one or more memories coupled to the one or more processors. The processing system is configured to dynamically adjust antenna impedance matching circuitry in accordance with a codeword and as a function of a traffic pattern. The processing system is further configured to perform a wireless communication operation associated with the traffic pattern and in accordance with the codeword.

The invention relates to a broadband high-gain radar antenna based on a metasurface and application, and belongs to the field of antenna design. The antenna comprises a metasurface layer (RogersRO3003C substrate and a periodic ideal electric conductor rectangular unit), an air cavity, a radiation layer (an ideal electric conductor patch with a rectangular slot), a grounding plane with a rectangular slot and a feed layer (microstrip line) from top to bottom in sequence, and works near 12.4 GHz. The metasurface unit is optimized through characteristic mode analysis, the air cavity improves impedance matching, and the microstrip line is coupled with the radiation layer gap for feeding through the grounding plane rectangular groove. CST simulation shows that the impedance bandwidth of the antenna is 1800 MHz at the frequency of 11.6-13.4 GHz, the peak gain is 8.37 dBi, the radiation efficiency is nearly 100%, the antenna can be used for millimeter wave radar, and a new thought is provided for miniaturization and high performance of the antenna.

The invention discloses a long-wave antenna for improving the quality factor Q value of the antenna, and relates to the technical field of communication systems. A magnetic core is installed in the shell in a clearance fit mode, an enameled wire is wound around the magnetic core, a connector is fixedly installed at the upper end of the shell, the two ends of the enameled wire are electrically connected to the connector, and capacitors are electrically connected to the two ends of the enameled wire. The enameled wire comprises an insulating sleeve and a plurality of wire cores, and the insulating sleeve is mounted and sleeved on the outer side of the plurality of wire cores; the shell is filled with fireproof sealant, and the fireproof sealant wraps the outer sides of the magnetic core, the enameled wire, the connector and the capacitor. Compared with the prior art, the multi-core enameled wire is utilized, the antenna impedance is reduced and the inductance value of the antenna is improved under the condition that the volume of the coil is reduced, so that the technical effect of improving the quality factor Q value of the antenna is realized.

A sensor system configured to provide an indication of a sensed parameter, the sensor system comprising: a reader comprising a reader antenna configured to transmit a carrier signal; a tag comprising: a tag antenna configured to receive the carrier signal; power harvesting circuitry coupled to the tag antenna and configured to produce an operating voltage from the receiver carrier signal; the voltage-controlled oscillator, VCO, circuitry coupled to the power harvesting circuitry and configured to receive the operating voltage therefrom, wherein the VCO circuitry comprises a VCO configured to generate an output signal having a frequency which varies based on the sensed parameter, and wherein the VCO circuitry is configured to modulate an impedance of the tag antenna according to a timing parameter selected based on the frequency of the output signal from the VCO; a controller coupled to the reader antenna and configured to: (i) identify an indication of the timing parameter of the impedance modulation of the tag antenna based on detected changes in the reader antenna impedance, and (ii) determine an indication of the sensed parameter based on the identified indication of the timing parameter.

A circuit (100) for impedance transformation includes a first port (P1), a second port (P2), and a tap transformer (110), wherein the tap transformer (110) includes a first winding (111) and a second winding (112). Each winding includes a first terminal, a second terminal, and a plurality of taps, wherein the plurality of taps are connected at different positions between the first terminal and the second terminal. The circuit (100) further includes: a first programmable capacitor (C1) connected in parallel with the first winding (111); a second programmable capacitor (C2) connected in parallel with the second winding (112); a first set of switches (S1) connected between the plurality of taps on the first winding (111) and the terminal of the first port (P1); and a second set of switches (S2) connected between the plurality of taps on the second winding (112) and the terminal of the second port (P2). The circuit (100) is configured to transform the impedance between the first circuit (120) and the second circuit (130) by selectively connecting a first circuit (120) connected to the first port (P1) to one of the taps on the first winding (111) via a first set of switches (S1) and selectively connecting a second circuit (130) connected to the second port (P2) to one of the taps on the second winding (112) via a second set of switches (S2).

The utility model relates to the technical field of electronic equipment, in particular to a wearing state detection sensor, a headphone and audio equipment. The sensor comprises a wearing detection antenna, a directional coupler, a coupling signal detection circuit and a detection chip, the wearing detection antenna is connected with a coupling port of the directional coupler, the output end of the directional coupler is connected with the input end of the coupling signal detection circuit, and the output end of the coupling signal detection circuit is connected with the input end of the detection chip. The wearing detection antenna changes the antenna impedance when the human ear approaches, further changes the radio frequency power output by the directional coupler, and uses the coupling signal detection circuit to convert the radio frequency power into a voltage amplitude to detect the approaching and leaving conditions of the human ear, so as to judge whether the headset is worn, thereby achieving the low-cost and high-reliability headset wearing detection function.

A user equipment (UE) is provided that includes an antenna switch array for demultiplexing a reference signal sequentially to each antenna in a plurality of antennas. While the antenna switch array selects an antenna, the UE measures a reflection coefficient for the antenna. The UE then tunes the antenna responsive to the reflection coefficient measurement.

A thermally adaptive antenna system having an antenna structure, an EM) power signal, a DC power signal, an impedance tuner, a temperature sensor in the antenna, a DC-DC conversion component, and a microcontroller. The microcontroller provides a tuning command to the impedance tuner, causing the impedance tuner to compensate for an impedance change in the antenna due to a temperature change in the antenna. An environmentally adaptive antenna system has an antenna structure, an EM power signal, a DC power signal, an EM power splitter, a directional coupler, a reference receiver, a measurement receiver, an impedance tuner, and a controller. The controller calculates antenna impedance change based on observed changes in return loss, calculates a corresponding correction to the antenna impedance, and sends a command to the impedance tuner to implement the correction to the antenna impedance.

The invention discloses a PC5 antenna performance enhancement method and system based on an AI large model, and relates to the field of antenna performance enhancement, and the method comprises the steps: constructing an antenna performance knowledge base; constructing an antenna performance data set in combination with a simulation experiment; based on a similarity algorithm, introducing an environment variable, and constructing an antenna performance environment enhancement data set; constructing a PC5 antenna performance enhancement prediction model, and obtaining an antenna performance index prediction sequence; compressing the cloud PC5 antenna performance enhancement prediction model into a lightweight model, and dynamically predicting an optimal antenna tuning parameter according to vehicle real-time environment data; the optimal antenna tuning parameter is dynamically predicted according to the real-time environment data of the vehicle, and the antenna impedance is re-matched to a set value by using the reconfigurable impedance matching network. The method has the advantages that the training data used for PC5 antenna performance enhancement are effectively generated, and the PC5 antenna performance is dynamically enhanced through the cloud PC5 antenna performance enhancement prediction model and the lightweight model in combination with real-time monitoring data.

The utility model relates to a control circuit of an intermediate frequency antenna impedance matcher. The control circuit comprises a radio frequency relay main loop, a signal control circuit, a state feedback circuit and a display circuit. The circuit overcomes the long-standing defect that a main radio frequency path of an existing intermediate-frequency antenna impedance matching box is grounded through a signal relay contact for a long time, effectively prevents lightning stroke from generating induction current through an antenna end to damage components such as a capacitor and a relay in a control circuit, and guarantees stable operation of a matching box unit when an intermediate-frequency transmitter operates. The problem that electrical faults of a capacitor, a relay and the like in the matching box occur frequently in recent years is thoroughly solved, stability and reliability of intermediate frequency NAVTEX frequency broadcasting of a coast radio station are guaranteed, meanwhile, the technical scheme can be applied to other types of antenna impedance matchers in an extended mode, and the stability of the antenna impedance matching box is further improved.

The present disclosure relates to a diplexer with an impedance inverter. The diplexer can be used to isolate a transmitter and a receiver that share a common antenna. The diplexer is balanced by using an impedance gradient that provides an impedance that causes a balun of the diplexer to cut off access to the common antenna rather than replicate the antenna impedance. Such a cut off can have lower insertion loss than a diplexer that replicates the antenna impedance only to separate differential signals and common mode signals of the receiver and transmitter.

An apparatus for wireless communication includes a processing system. The processing system includes one or more processors and one or more memories coupled to the one or more processors. The processing system is configured to dynamically adjust antenna impedance matching circuitry in accordance with a codeword and as a function of a traffic pattern. The processing system is further configured to perform a wireless communication operation associated with the traffic pattern and in accordance with the codeword.

The invention discloses an antenna impedance matching control method in an RFID tag manufacturing process, which relates to the field of impedance matching, and comprises the following steps: generating a probe scanning track, and carrying out scanning configuration; obtaining a single-point frequency spectrum of each excitation point; obtaining the impedance difference of each excitation point; and outputting the corresponding suggested regulation and control strategy and feeding back to a preset prompting terminal for prompting. According to the method, the key geometric features and electrical features of the antenna structure in the RFID tag are analyzed, excitation points are adaptively increased based on the structural complexity, the scanning track of the probe is dynamically adjusted, and the accuracy and rationality of excitation point distribution are remarkably improved. Compared with a traditional fixed excitation point distribution method, the method can be focused on a structure complex area and an electromagnetic sensitive area, and differential scanning configuration of structure sensing driving is achieved, so that the spatial resolution and the overall accuracy of micro-area impedance matching evaluation are improved, and guarantee is provided for subsequent high-precision spectrum analysis and abnormal area recognition.

Methods, systems, and computer program products are provided for dynamically reconfigurable tuning for wireless power and data communications. A wireless charging (WLC) device may improve the efficiency of variable power and data communication to a chargeable device with variable relative positioning and coupling in 3D space by dynamically reconfiguring transmitter tuning. A WLC transmitter may be dynamically reconfigured (e.g., between symmetric and asymmetric antenna impedance matching) based on at least one of the type of wireless transmission or a wireless transmission efficiency for the type of wireless transmission. For example, the controller may dynamically select a configuration for wireless power (e.g., or data) transmission based on the most efficient configuration determined from dynamically measured efficiencies for asymmetric and symmetric wireless power (e.g., or data) transmission. Tuning may be dynamically reconfigured, for example, by controlling an automatically variable inductor (e.g., comprising at least one ring switch) to automatically vary inductance.

This disclosure provides techniques for impedance matching. A radio frequency (RF) device includes a power detector to determine a transmitter leakage and a post-processing unit to determine a receiver leakage, and determines if isolation is acceptable based on the leakages. The RF device may include a device for measuring antenna impedance. Otherwise, the RF device may select multiple tuner settings (e.g., capacitor values) for test signals to be transmitted and received at a target frequency, determine multiple sets of leakage values, determine multiple reflection coefficients based on the multiple sets of leakage values, and determine an estimated antenna impedance at the target frequency based on the reflection coefficients. The RF device then determines impedance tuner settings based on the measured or estimated antenna impedance. Alternatively, the RF device determines impedance tuner settings using an inverse machine-learning model based on a determined matching impedance.

Embodiments of the present application provide a communication device and a working method of the communication device to solve the problem of power waste caused by active signal receiving of a receiver in the prior art. The communication device comprises communication circuitry, which comprises an antenna, an impedance matching network, a control circuit, a receiver, a protocol processor, and a signal processing circuit. The antenna is connected with an input end of the impedance matching network, output ends of the impedance matching network are connected with the control circuit and the signal processing circuit respectively, an output end of the signal processing circuit and an output end of the control circuit are connected with the receiver respectively, and the receiver is connected with the protocol processor. The antenna sends the received radio frequency signal to the control circuit and the signal processing circuit through the impedance matching network. When the control circuit outputs a high level according to the radio frequency signal, the receiver is powered and receives the radio frequency signal sent by the signal processing circuit to send to the protocol processor, so that the protocol processor performs protocol processing on the radio frequency signal.

This disclosure provides techniques for impedance matching. A radio frequency (RF) device includes a power detector to determine a transmitter leakage and a post-processing unit to determine a receiver leakage, and determines if isolation is acceptable based on the leakages. The RF device may include a device for measuring antenna impedance. Otherwise, the RF device may select multiple tuner settings (e.g., capacitor values) for test signals to be transmitted and received at a target frequency, determine multiple sets of leakage values, determine multiple reflection coefficients based on the multiple sets of leakage values, and determine an estimated antenna impedance at the target frequency based on the reflection coefficients. The RF device then determines impedance tuner settings based on the measured or estimated antenna impedance. Alternatively, the RF device determines impedance tuner settings using an inverse machine-learning model based on a determined matching impedance.

The utility model discloses a radio frequency identification (RFID) near field antenna, which comprises an upper antenna layer, a substrate material layer, a metal connecting layer, a lower antenna layer and a chip, the upper antenna layer and the lower antenna layer are conductively connected through the metal connecting layer to form a continuous annular circuit structure, the antenna layer is annular, and the chip is arranged on the substrate material layer. The side end of the upper antenna layer is connected with a first parallel metal block through a first connecting line, the side end of the lower antenna layer is connected with a second parallel metal block through a second connecting line, the first parallel metal block and the second parallel metal block are vertically opposite and are separated through a substrate material layer, and a classic parallel plate capacitor structure is formed. Through the above mode, the antenna impedance is convenient to adjust, the antenna can be rapidly adapted to various RFID chips by adjusting the area of the antenna loop and the area of the parallel plate capacitor, the impedance matching problem of the antenna and the chip under the condition of small size is solved, and the reading distance of the small-size near-field antenna is improved.

The application relates to the technical field of smart home, in particular to a simulation method and system suitable for a multi-level family energy management system. The method comprises the following steps: obtaining smart home data, and extracting communication protocol data; detecting an equipment abnormal state based on the communication protocol data, and obtaining the equipment abnormal state; constructing a smart home model based on the smart home data, and performing smart home control simulation by using preset control instructions to generate smart home control data; performing energy consumption analysis according to the smart home control data to obtain energy consumption data; performing circuit board soldering hot state fault decoding according to the equipment abnormal state to obtain circuit board fault data; performing antenna impedance etching change diagnosis according to the equipment abnormal state to obtain antenna damage data, and performing signal decay spectrum deduction to generate signal attenuation data. The application improves the equipment fault detection, the self-adaptive ability of the system and the overall energy efficiency management rate based on the smart home technology.

A device for detecting an approach of a part of a user's body or of a portable user equipment, intended to be housed on board a motor vehicle, including: a near-field communication antenna configured to transmit signals at a high frequency selected between 3 and 30 MHz, the antenna being able to detect the approach of a portable user equipment and to communicate in near-field mode with the portable user equipment. The antenna including at least one winding that extends continuously in the form of a set of comb-shaped rods such that the antenna is able to generate a variation in capacitance in response to the approach of a part of a user's body; a controller for controlling the antenna; and a measurer for measuring a variation in impedance of the antenna, generated by the variation in capacitance.

This invention relates to the field of antenna technology, and specifically discloses an antenna and a wireless device, including a substrate and an antenna body. The antenna body is at least partially mounted on the surface of the substrate. The antenna body includes a main stub, an adjustable stub, a feed point, and a ground plane. The main stub is at least partially mounted on the surface of the substrate. The feed point is located on the main stub, and the ground plane is coupled to the main stub. The adjustable stub is located on the main stub and can move along a first direction to adjust the antenna impedance. Through this method, the antenna of this invention can match the impedance of the antenna to the impedance of the feed line by moving the adjustable stub, thereby enhancing anti-interference capability and radiation efficiency.

The application discloses a wide-beam circularly polarized antenna based on a cross dipole, wherein the end of an electric dipole is designed into a T-shaped structure to reduce the size of the antenna; a parasitic patch is introduced to widen the impedance bandwidth and the beam width of the antenna; and the beam is widened and the circular polarization angle range is increased through the method that the vertical monopole pattern is complementary to the cross dipole.