172 results about "Antenna impedance" patented technology

A tight coupling array antenna based on an integrated microstrip balun is composed of a plurality of polarization units, each polarization unit comprises an antenna floor, a magnetic wave-absorbing material is arranged above the antenna floor, a supporting material is arranged above the magnetic wave-absorbing material, a radio frequency connector is arranged in the antenna floor, the radio frequency connector is connected with one end of a coaxial feeder line, and the other end of the coaxial feeder line is connected with the antenna floor. The other end of the coaxial feeder line sequentially passes through the antenna floor, the magnetic wave-absorbing material and the supporting material; a lower substrate is arranged above the supporting material; a feed balun is printed on the upper surface of the upper-layer substrate, and a multiplexing oscillator arm is printed on the lower surface of the upper-layer substrate; the multi-layer board technology is adopted, the antenna radiator, the coupling body and the feed balun are printed on different copper layers of the multi-layer board respectively, space optimization is achieved, antenna impedance matching is further optimized, and the antenna has the advantages of being excellent in performance and easy to install; according to the invention, the feed balun in the form of the multi-order microstrip transmission line is adopted to optimize all-order microstrip transmission line models, so that the compactness of the antenna unit is effectively improved.

A device for detecting an approach of a part of a user's body and / or of a portable user equipment, housed on board a motor vehicle, including: a near-field communication antenna configured to transmit and receive signals at a high resonant frequency between 3-30 MHz. The antenna includes at least one winding extending continuously in the form of a set of rods such that the rods have a variable capacitance connected to the antenna and the antenna is able to generate a capacitance variation in response to the approach of a part of a user's body; a measurer for measuring, through electromagnetic coupling with the antenna, an impedance variation or a frequency variation of the antenna. The measurer having a series resonant frequency at the selected high resonant frequency and able to detect the approach of a portable user equipment or the approach of a part of the user's body.

The invention relates to the technical field of smart home, in particular to a simulation method and system suitable for a multi-level home energy management system. The method comprises the following steps: acquiring smart home data, and extracting communication protocol data; detecting an equipment abnormal state based on the communication protocol data to obtain the equipment abnormal state; constructing a smart home model based on the smart home data, and performing smart home control simulation by using a preset control instruction to generate smart home control data; performing energy consumption analysis according to the smart home control data to obtain energy consumption data; circuit board soldering tin thermal state fault decoding is carried out according to the equipment abnormal state, and circuit board fault data are obtained; and performing antenna impedance alteration diagnosis according to the abnormal state of the equipment to obtain antenna damage data, and performing signal decay spectrum deduction to generate signal attenuation data. According to the invention, based on the smart home technology, the equipment fault detection, the self-adaptive capability of the system and the overall energy efficiency management rate are improved.

The invention discloses a novel metasurface matching layer for an ultra wide band curved surface array antenna, which comprises a curved surface supporting material layer, a dielectric substrate and a metasurface metal layer, and is characterized in that the dielectric substrate is bent and conformal on the curved surface supporting material layer, and the metasurface metal layer is arranged on the dielectric substrate; and a plurality of metasurface units are uniformly distributed on the metasurface metal layer. According to the novel metasurface matching layer, curved surface conformal can be realized, and the broadband impedance matching capability and the large-angle scanning performance of the ultra-wideband curved surface array antenna can be improved. According to the equivalent model theory of the novel metasurface matching layer, the novel metasurface matching layer provided by the embodiment of the invention can be equivalent to a dielectric layer with a high dielectric constant, the impedance matching of the antenna is improved, and compared with a common dielectric layer, the novel metasurface matching layer for the ultra-wideband curved surface array antenna provided by the embodiment of the invention has the advantages of light weight, low cost and the like. The cost is low, the processing is easy, and the development prospect is great.

The invention discloses a method and a system for building a microwave energy collection device of an electronic transformer, and the method comprises the steps: collecting and analyzing a first signal transmitted by a first object, and selecting an antenna; and performing simulation analysis according to the first characteristic parameter of the antenna, and further screening a proper antenna. And constructing a first network and a circuit of the first object, performing simulation, and collecting first signal energy. According to the microwave energy collection device for the electronic mutual inductor provided by the invention, the influence of an antenna and a matching circuit on the performance of a radio frequency energy collection system is fully considered; the antenna, the impedance matching circuit and the energy management circuit are comprehensively designed from the aspect of energy utilization efficiency, so that the electronic transformer can realize stable power supply by collecting microwave energy in a working environment.

The invention provides a multi-RFID tag sensing method and system, a terminal and a storage medium. The method comprises the following steps: acquiring antenna impedance of an RFID antenna under multiple groups of preset environment parameters and chip impedance of an RFID chip under multiple groups of preset input power; processing corresponding chip impedance and antenna impedance by using a self-tuning circuit in the RFID chip to obtain corresponding self-tuning values, and establishing a mapping relation between an average value of the self-tuning values and a near-field environment; constructing a target function based on the self-tuning value and the near-field environment, adjusting initial design parameters of the RFID antenna to maximize the target function, and obtaining optimized antenna design parameters; and designing a target antenna by using the optimized antenna design parameters, and receiving a signal of the RFID tag by using the target antenna. According to the method, the antenna parameters are optimized, the transmitting power is no longer adjusted one by one, and the efficiency of acquiring the near-field environment information when a plurality of RFID tags are processed is effectively improved.

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.

A radio frequency device has a multifunctional tuner that stores measurements of reflection coefficient parameter in a register. The radio frequency device also has a transceiver that has a transmitter. The transceiver may detect a transmitter signal from the transmitter to an antenna in an initial tuning state and then determine whether the transmitter signal is stable. In response to the transmitter signal being stable, the transceiver may measuring the reflection coefficient parameters at the multifunctional tuner. Furthermore, the radio frequency device has a baseband controller that has a memory to store instructions and a processor to execute the instructions. The instructions cause the processor to determine an antenna impedance based on the reflection coefficient parameters, and in response to determining that the antenna impedance is greater than or less than a threshold antenna impedance, iteratively tune the antenna using the multifunctional tuner.

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.

The invention belongs to the technical field of antennas, and provides a broadband circularly polarized millimeter wave magnetoelectric dipole antenna which comprises an excitation port, a microstrip feeder line, a 0.127 mm thick dielectric plate, a bonding layer, a metal floor, a grounding copper column, a 1.575 mm thick dielectric plate, a radiation patch and a parasitic patch. According to the millimeter wave circularly polarized antenna disclosed by the invention, the circular arc-shaped patch and the rectangular patch are effectively overlapped, and the axial ratio bandwidths of the two antennas are combined, so that a new radiation patch is formed, the broadband is realized, the axial ratio of the designed antenna unit is increased from 29.72 GHz-33.19 GHz to 27.95 GHz-43.33 GHz on the premise that the existing radiation performance is not influenced, and the antenna unit has a wide application prospect. The frequency band range of the antenna impedance matching lower than-10dB is 23.8-61.6 GHz, and the impedance matching relative bandwidth reaches 88.5%; the range of the frequency band with the axial ratio lower than 3dB is 27.95-43.33 GHz, and the relative bandwidth of the axial ratio reaches 43.1%; the frequency band range of the 3dB gain is 25.09-42.09 GHz, the relative bandwidth of the 3dB gain reaches 50.6%, the maximum gain 9.6 dBic is achieved at the 34GHz, the performance is excellent in all aspects, and the requirement of a broadband wireless communication system can be met.

The invention provides a dual-polarization wide-angle scanning planar tight coupling array antenna which comprises a plurality of antenna units which are periodically arranged and are composed of metasurface wide-angle impedance matching layers, metal radiators and metal floors. The wide-angle impedance matching layer is composed of two metasurfaces which are stacked up and down and respectively comprise a plurality of metal rings arranged periodically and square metal patches with gradually changing sizes. The wide-angle impedance matching layer of the metasurface can improve the influence of instability caused by rapid change of antenna impedance on a scanning angle, is beneficial for realizing impedance matching in a broadband, and has a relatively wide-angle-domain beam scanning capability; and the radiating body made of the metal material can eliminate bandwidth deterioration caused by common-mode resonance generated by the antenna in a frequency band range, so that the structure of the antenna is effectively simplified on the premise of ensuring the ultra-wideband characteristic.

Embodiments of the present disclosure relate to a terminal device (200) and a communication system (900) comprising at least one terminal device (902). The terminal device (200) comprises first circuitry (214) coupled to an antenna (202) and configured for a binary phase shift keying (BPSK) modulation based on a dual frequency signal received via the antenna. A first frequency part (204) of the dual frequency signal matches the antenna resonance frequency and is used for charging an energy storage, and a second frequency part (206) of the dual frequency signal is used for performing the BPSK modulation at a mismatched frequency of an antenna impedance. The terminal device (200) also comprises second circuitry (212) coupled to the first circuitry and configured to control a state of the first circuitry for performing the BPSK modulation. The terminal device can support BPSK backscatter with low complexity, cost, and a small size.

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.

The utility model relates to an all-round nonmetal RFID tag antenna which is not only good in universality, but also good in antenna use effect, two sides of an antenna impedance adjusting ring are respectively provided with an antenna radiation arm, and the lower side of the antenna impedance adjusting ring is provided with two connecting parts which are oppositely arranged. The connecting part is composed of a first oblique line section, a second oblique line section, a third oblique line section, a first transverse line section and a second transverse line section, the second oblique line section is arranged between the first oblique line section and the third oblique line section, one end of the first transverse line section is connected with the lower end of the first oblique line section, and one end of the second transverse line section is connected with the upper end of the second oblique line section; the upper ends of the first oblique line segments in the two connecting parts are respectively connected with the lower end of the antenna impedance adjusting ring, the two first oblique line segments are distributed in a splayed shape, and the lower ends of the third oblique line segments in the two connecting parts are respectively connected with the inner side ends of the corresponding antenna radiation arms. The all-round nonmetal RFID tag antenna has the advantages of being good in universality and good in antenna using effect.

The invention provides a low-power-consumption temperature interference resistant transmitter for a wireless sensor network. The transmitter provides a stable reference current by temperature compensation of a beta multiplier reference circuit (BMR). Or stable reference current is provided directly through an off-chip circuit. Through combination of a current starvation type voltage-controlled oscillator (CSVCO) and a frequency locked loop (FLL), stable carrier frequency is realized under the condition of low power consumption. The negative temperature coefficient resistor integrated in the FLL further enhances the adaptability of the system to temperature change. The transmitter further comprises a buffer and a switched capacitor power amplifier (SCPA), and the switched capacitor power amplifier (SCPA) facilitates impedance matching with the antenna in a mode of activating part of units, and meanwhile loss is reduced. OOK modulation is realized by controlling the on-off state of the SCPA. According to the low-power-consumption temperature interference resistant transmitter, the power consumption is reduced, the temperature interference resistant capability of the carrier generator is remarkably improved, and the low-power-consumption temperature interference resistant transmitter has a wide application prospect.

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 embodiment of the invention provides communication equipment and a working method of the communication equipment, which are used for solving the problem of power consumption waste caused by active signal receiving of a receiver in the prior art. The communication device includes communication circuitry including an antenna, an impedance matching network, a control circuit, a receiver, a protocol processor, and a signal processing circuit. The antenna is connected with the input end of the impedance matching network, the output end of the impedance matching network is respectively connected with the control circuit and the signal processing circuit, the output end of the signal processing circuit and the output end of the control circuit are respectively connected with the receiver, and the receiver is connected with the protocol processor; the antenna sends a received radio frequency signal to the control circuit and the signal processing circuit through the impedance matching network, and when the control circuit outputs a high level according to the radio frequency signal, the receiver supplies power, receives the radio frequency signal sent by the signal processing circuit and sends the radio frequency signal to the protocol processor, so that the protocol processor performs protocol processing on the radio frequency signal.

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.

The invention discloses a cable-free chip antenna impedance and gain measurement method, which comprises the following steps of: firstly establishing an electromagnetic model of a probe and a measured antenna, then establishing a free space propagation model based on a one-way transmission equation and a model of a measurement system, and then establishing an electromagnetic model of the measurement system comprising the probe, the free space propagation model and the measured antenna; the method comprises the following steps: firstly, deducing a complete electromagnetic model of a measurement system comprising any probe, free space propagation and any measured antenna, then determining scattering matrixes of the probe, the free space propagation and the measured antenna, and extracting antenna impedance and gain from near-field distance measurement; according to the invention, the influence of leakage current, scattering effect and the like of a traditional probe and a feed cable on a chip antenna is overcome, the method can be well applied to a scene in which a feed line has great influence on a measured antenna, and the measurement precision of the antenna is greatly improved.

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).

Method for controlling an NFC device. This description relates to a method for controlling a first NFC device (102) comprising an NFC controller (110) connected to an antenna (204), wherein a charging mode of a second, remote NFC device (108) via the antenna (204) is interrupted following detection, by the NFC controller (110), of a change in the impedance of the antenna (204), the interruption being followed by the initiation of communication, via the antenna (204), with a third, remote NFC device (112). Figure for the abstract: Fig. 4

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.