352 results about "Loop antenna" patented technology

The invention discloses a dam leakage detection method based on combination of a circuit and an electromagnetic field. The method comprises the following steps: step 1, placing an emission electrode at a certain depth in a water area on one side of an upstream face of a dam; 2, a loop electrode is placed at the position 3 meters away from one side of the downstream face of the dam; step 3, connecting the emission electrode and the loop electrode by using a power supply to form a planar array; 4, detecting a voltage signal of the electromagnetic wave by the collecting electrode; step 5, placing a horizontally polarized loop antenna on one side for transmitting, and symmetrically placing a vertically polarized loop antenna and a line antenna on the other side for receiving; and 6, detecting the vertical position of the leakage path by using a common depth method. According to the detection method disclosed by the invention, the detection efficiency and precision can be improved, weak leakage can be accurately positioned, the operation is simple, operation by using a ship in water is not needed, and a dam structure does not need to be damaged by drilling.

The invention relates to the technical field of quantum sensing and ocean detection, and discloses an ocean magnetic field sensor based on an NV color center and an ocean magnetic field measuring method.The sensor comprises a cylindrical pressure-resistant cabin, an optical platform arranged in the pressure-resistant cabin and a main control panel; a laser, a beam shaping unit, a dichroscope, a beam shaping lens group, an objective lens, a diamond NV color center chip, a plano-convex lens I, a band-pass filter and a photoelectric detector are mounted on the optical platform; two microstrip loop antennas are mounted on the outer side of the diamond NV color center chip; an FPGA + ARM dual-core processor, a digital lock-in amplifier and two microwave signal generators are installed on the main control board, and the microwave signal generators are connected with the microstrip loop antenna and achieve electromagnetic coupling with the diamond NV color center chip. The invention has the advantages of high sensitivity, good long-term stability and strong anti-interference capability, and provides a new generation of quantum sensing solution for applications such as ocean geomagnetic monitoring and underwater target identification.

The invention discloses a large loop antenna satellite attitude and orbit integrated control method based on improved explicit model predictive control, and relates to the technical field of large spacecraft attitude and orbit integrated control. The invention aims to solve the problem that a control method of a large-scale loop antenna satellite model is difficult to give consideration to calculation real-time performance and optimization of large-scale memory occupation in a complex space environment. The method comprises the following steps: parameterizing control input of a large-scale loop antenna satellite by using a Laguerre function, and performing order reduction on the control input to obtain a decision variable; the method comprises the following steps: rewriting a dynamic model of a large-scale loop antenna satellite attitude orbit into a Laguerre model predictive control form with constraints by using decision variables, then converting the Laguerre model predictive control form with constraints into an equivalent multi-parameter quadratic programming form, and carrying out display solution on the multi-parameter quadratic programming form to obtain a segmented affine function; and substituting the observation state of the large-scale loop antenna satellite into the piecewise affine function so as to construct attitude and orbit control input of the large-scale loop antenna satellite.

The invention relates to the field of array signal processing, and particularly discloses a DOA joint estimation method based on a quaternion polarization sensitive array. Electromagnetic wave dual polarization components are captured through the orthogonal dipole and the loop antenna, and a quaternion observation matrix is constructed; calculating a quaternion covariance matrix by adopting a sliding window mechanism, and separating a signal / noise subspace by adopting quaternion singular value decomposition; and constructing a spatial spectrum function in combination with a quaternion steering vector, and realizing joint estimation of an azimuth angle and a pitch angle through two-dimensional search. According to the method, the unified characterization capability of quaternions on polarization-airspace information is fully utilized, and the DOA estimation precision and the anti-interference performance of the multi-polarization signal are remarkably improved.

A system may include a loop antenna and a dipole antenna that includes at least two dipole arms. Each of the at least two dipole arms may be electrically connected to the loop antenna. Within the system, the loop antenna may be a balun for the dipole antenna. In some cases, the electrical connection between the loop antenna and the arms of the dipole antenna may create a combined loop-dipole, dual-wideband antenna. The combined antenna may be tunable using a tuner that is electrically connected to the combined antenna. Various other mobile electronic devices, apparatuses, and methods of manufacturing are also disclosed.

An RFID tag component, an RFID tag assembly and an object to be identified attached with the RFID tag assembly are disclosed. An RFID tag component includes an insulating ring; a film antenna bonded to the inner peripheral surface of the insulating ring, the film antenna formed by connecting an IC chip with a metal loop antenna, the metal loop antenna being flexible so the film antenna adheres to the inner peripheral surface of the insulating ring along a circumferential direction after being bonded to the inner peripheral surface; and a conducting medium layer adhering to an outer peripheral surface of the insulating ring in the circumferential direction and partially surrounding the insulating ring so a slot is between two ends of the conducting medium layer. The conducting medium layer is inductively coupled with the metal loop antenna to radiate RF signals from the IC chip outwardly through the slot.

Smartcard (SC) having a metal card body (MCB) which is a coupling frame (CF) with a slit (S), and a coupling loop antenna / structure (CLA, CLS) connected to termination points (TP) on each side of the slit (S) and coupled with the module antenna (MA) of a transponder chip module (TCM). A portion of the card body (CB) may be metal and another, coplanar portion of the card body may be a synthetic material which may be transparent or translucent. Currents may be collected from the interface between the two portions. The card body (CB) may have two metal layers of different materials, adhesively joined to each other using a thermosetting epoxy that converts from B-stage to C-stage during lamination.

A transaction card is described that includes a first layer, a second layer, a loop antenna, an inductive illumination antenna, and a light-emitting element. At least a one of the first layer and the second layer has a transparent planar portion through which light transmits. The loop antenna is inset between the first layer and the second layer. The light-emitting element has a first terminal and a second terminal. The inductive illumination antenna is inset between the first layer and the second layer and positioned proximate to the loop antenna such that, when the transaction card is positioned in a magnetic field, the inductive illumination antenna is induced with a current from the loop antenna. The inductive illumination antenna is connected to the first terminal and the second terminal.

Disclosed herein, among other things, are systems and methods for a hearing device antenna. One aspect of the present subject matter includes a hearing device configured to be worn in an ear of a wearer to perform wireless communication. The hearing device includes a housing, hearing electronics within the housing, and an inverted F antenna or loop antenna disposed at least partially in the housing and configured for performing 2.4 GHz wireless communication. In various embodiments, at least a portion of the antenna protrudes from an exterior of the housing.

A single-layer broadband vertically polarized endfire magnetoelectric dipole (ME-dipole) antenna and an antenna array. The main radiator of this antenna is a substrate-integrated closed loop, which consists of two horizontal metallic strips printed on the upper and lower surfaces of substrate and a pair of vertical metallic vias. Excited by a double-sided parallel-strip line at the center of the loop, the metallic vias function as electric dipoles while the entire loop aperture works as magnetic dipole. To facilitate integration, this magnetoelectric dipole loop antenna is fed by an open-ended substrate integrated waveguide (SIW), which also works as a backed cavity to enhance the front-to-back ratio. Moreover, rectangular slots are etched at the edges of the SIW aperture to further improve the front-to-back ratio and also the cross-polarization performance. Thus, a vertically polarized endfire ME-dipole loop antenna with a low-profile structure, broad bandwidth, and stable radiation performance is achieved.

A radio-frequency identification (RFID) tag, wherein an operational characteristic of the tag is susceptible to influence by a material comprising an object to which it is attached, comprising: a substrate comprising an attachment region and a flap region, the attachment region for coupling the RFID tag to a surface of an object; and, an RFID inlay formed on the substrate, comprising a loop antenna and a dipole antenna, the loop antenna and the dipole antenna each having first and second portions within the attachment and flap regions, respectively, wherein a relative portion of the loop antenna within the attachment region has a positive influence on the operational characteristic when attached to an object and a relative portion of the dipole antenna within the attachment region has a negative influence on the operational characteristic, whereby the net influence on the operational characteristic by the object can be minimized.

This application describes mechanisms to manage closed-loop antenna selection for a wireless device. The wireless device transmits sounding reference signal (SRS) resources configured by a cellular wireless network in an SRS resource set and receive SRS indicator (SRI) values to indicate antennas for subsequent uplink transmission of one or more physical layer channels by the wireless device, including a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH). The wireless device supplements the closed-loop antenna selection with an open-loop antenna selection and uses the open-loop antenna selection for non-PUSCH channels when a most recently SRI value can be considered stale. SRI-based closed-loop antenna selection is extended to frequency division duplexing (FDD) bands. Transmit precoding matrix indicator (TPMI) group values are also used to indicate differential transmit power capabilities of various antennas of the wireless device to the cellular wireless network.

The invention discloses a plasma regulation and control device based on a radio frequency inductive coupling technology, and relates to the technical field of plasma parameter regulation and control. In order to solve the technical problems in the prior art that although traditional gradient generation equipment can generate a high-density electrode, the time is short, and an experimental environment electrode and a continuous controllable electrode are difficult to generate plasmas with enough large area while ensuring the discharge uniformity, the invention provides a gradient generation device. According to the technical scheme provided by the invention, the plasma regulation and control device based on the radio frequency inductive coupling technology comprises a discharge chamber; the annular antenna main body sleeves the outer wall of the discharge chamber and is used for generating plasma in the discharge chamber; the binding post is arranged on the loop antenna and is used for connecting the input end and the output end of the radio frequency power supply; the rake type probe array is used for measuring the electron density and temperature of the plasma; and the servo system is used for driving the rake type probe array to move. The method is suitable for being applied to plasma parameter regulation and control work.

The invention relates to an annular antenna microgravity simulation experiment device based on a magnetic suspension technology. The annular antenna microgravity simulation experiment device comprises a rack, a linear guide rail group, a magnetic suspension driving module, a suspension rope, an annular deployable antenna, a driving rope and an antenna driving module, the linear guide rail group is horizontally arranged above the rack, and the tail end of the linear guide rail group is fixedly connected with the top end of the rack; the magnetic suspension driving modules are respectively arranged at the lower parts of the linear guide rail groups; the bottom of the magnetic suspension driving module is connected with nodes of the annular deployable antenna through suspension ropes. And the antenna driving module is arranged at one end of the bottom of the rack. The device has the characteristics of high-precision microgravity environment simulation, a large-aperture annular deployable antenna structure, excellent synchronous following performance and no friction, and solves the problems that the friction force is large, the antenna node and the gravity compensation device cannot be synchronized in real time and the like when the conventional large-aperture annular antenna performs a gravity compensation experiment by using a suspension method.

The utility model discloses a vehicle-mounted short-wave double-loop antenna lodging device, which comprises a case, a driving assembly, an antenna fixing platform and a rotating arm, the driving assembly is arranged in the case; the antenna fixing platform and the case are oppositely arranged, and the antenna fixing platform is provided with an antenna large-ring oscillator mounting interface, an antenna small-ring oscillator interface, an antenna supporting rod mounting interface, an antenna large-ring oscillator antenna adjustment connecting port and an antenna small-ring oscillator antenna adjustment connecting port; the antenna large-ring oscillator mounting interface is connected with the antenna large-ring oscillator antenna tuning connector; the antenna small ring oscillator interface is arranged at the center of the antenna support rod mounting interface and is connected with the antenna small ring oscillator antenna adjustment connector; and two ends of the rotating arm are respectively connected with the case and the side wall of the antenna fixing platform. According to the utility model, the installation height of the dual-ring antenna can be effectively reduced, so that the impact, vibration and wind resistance borne by the dual-ring antenna are reduced.

This invention provides an automatic tuner for a loop antenna used in shortwave communication, belonging to the field of shortwave communication technology. This tuner aims to solve the problems of existing automatic tuners for loop antennas, such as difficulty in balancing versatility and high power performance, and poor high-voltage withstand capability. The tuner includes: a matching circuit, which includes couplers for shunting forward and reverse radio frequency signals; a tuning actuator, which includes an oil-immersed variable capacitor and a drive mechanism; and a main control circuit. Based on the signal shunted by the coupler, the main control circuit autonomously calculates the standing wave ratio (VSWR) and generates a control signal to control the matching circuit and tuning actuator independently of the radio transceiver, thus completing automatic tuning. This invention improves voltage withstand and power handling capability by using an oil-immersed variable capacitor, and achieves universal tuning through the autonomous control of the main control circuit, overcoming the shortcomings of existing technologies and offering the advantages of high power, high reliability, and strong versatility.

A helix antenna structure includes loop antennas and a multilayered printed circuit board including printed circuit board layers. Each printed circuit board layer includes a peripheral loop antenna and each adjacent two loop antennas are electrically connected by a connection bridge functioning as a monopole antenna. A selected printed circuit board layer physically and electrically accommodates a transmitter inside ‘its’ peripheral loop antenna, and it further includes a first antenna feeding line which is connected to the loop antenna that is disposed on the selected printed circuit board layer and electrically connectable to a first output terminal of the transmitter. A second antenna feeding line is disposed on another printed circuit board layer and electrically connected to its loop antenna and connectable to another output terminal of the transmitter. The two antenna feeding lines lie in a plane perpendicular to an axis of the printed circuit board after its folding.

To provide a detection system capable of improving workability after opening after a container is opened.SOLUTION: The detection system includes a detection wireless tag in which a loop antenna part is arranged on an opening cutoff line displayed on the container, a confirmation wireless tag in which the loop antenna part is arranged in the area where the cutoff line is not displayed of the container, and a detection device. The detection device includes a device side antenna which transmits and receives signals to and from the loop antenna part by wireless communication, a reading part which can read the detection tag ID of the detection wireless tag and the confirmation tag ID of the confirmation wireless tag through the device side antenna respectively, a detection part which detects that the container is opened, when the detection tag ID cannot be read and when the confirmation tag ID can be read, and a storage part which stores an opening date when the container is opened, when it is detected that the container is opened.SELECTED DRAWING: Figure 1

A controllable electrical outlet may comprise a resonant loop antenna. The resonant loop antenna may comprise a feed loop electrically coupled to a radio-frequency (RF) communication circuit and a main loop magnetically coupled to the feed loop. The controllable electrical outlet may comprise one or more electrical receptacles configured to receive a plug of a plug-in electrical load and may be configured to control power delivered to the plug-in electrical load in response to an RF signal received via the RF communication circuit. The RF performance of the controllable electrical outlet may be substantially immune to devices plugged into the receptacles (e.g., plugs, power supplies, etc.) due to the operation of the resonant loop antenna. For example, degradation of the RF performance of the controllable electrical outlet may be less when the controllable electrical outlet includes the resonant loop antenna rather than other types of antennas.

To provide an antenna device capable of obtaining sufficient radiation characteristics even when arranged in a state of being close to a metal member, and a detection device.SOLUTION: The antenna device includes an annular substrate including a first surface, a second surface, and an opening penetrating between the first surface and the second surface, an annular antenna element provided on the first surface and surrounding the opening, a first feed line provided on the first surface and including a feed terminal connected to the antenna element, a second feed line provided on the second surface and including a connection terminal connected to a communication unit, the second feed line including an overlapping portion that overlaps a first portion of the first feed line in plan view, and a through hole that penetrates the substrate and connects the first feed line and the overlapping portion of the second feed line.SELECTED DRAWING: Figure 4

An antenna system mounted on a vehicle according to the present invention comprises: a first antenna comprising a plurality of conductive members and operating as a radiator in a first frequency band; and a second antenna disposed in the antenna system separate from the first antenna, and operating in a second frequency band higher than the first frequency band. The first antenna may include a loop antenna configured in a loop shape to surround the plurality of conductive members such that signals from the plurality of conductive members are coupled.

The embodiment of the invention provides an antenna device and electronic equipment, and the antenna device comprises a first antenna unit which comprises a feeding point, and the feeding point is used for feeding in an excitation signal to excite the first antenna unit to generate first resonance; the second antenna unit is an annular antenna, a gap is formed between the second antenna unit and the first antenna unit, the second antenna unit is electromagnetically coupled with the first antenna unit through the gap, and the excitation signal is further used for exciting the second antenna unit and the first antenna unit to jointly generate second resonance. According to the antenna device provided by the embodiment of the invention, a new resonance frequency band can be increased, the bandwidth of the antenna device can be expanded, the limitation between the size of the second antenna unit and the size of the first antenna unit is very small, and the size of the second antenna unit and the size of the first antenna unit can be freely set, so that the design of the antenna device has a greater degree of freedom; therefore, the design of the antenna can be simplified.

The packaging box comprises an upper shell body and a lower shell body, the rear side of the upper shell body and the rear side of the lower shell body are hinged together through a hinge, butterfly locks are arranged on the front side of the upper shell body and the front side of the lower shell body and used for fixing the upper shell body and the lower shell body together after the upper shell body and the lower shell body are closed, the lower shell body is filled with lower sponge, and the upper shell body and the lower shell body are connected through a hinge. A special-shaped groove, a circular groove and an L-shaped sinking groove are formed in the lower sponge. The packaging box has two use functions, can store the loop antenna, can replace a tripod to erect the loop antenna, can reduce the carrying difficulty during outdoor work, and meanwhile has the advantages of being simple in structure, low in machining cost, convenient to operate and the like.

The invention relates to the technical field of communication, in particular to a broadband radiation field generation and measurement system and a maximum shielding effectiveness estimation method. The system mainly comprises a transmitting end and a receiving end. The transmitting end is composed of a signal generator, a power amplifier and a monopole antenna, and the flexible deployment problem of the high-size monopole mooring antenna is solved by adopting an unmanned aerial vehicle air stretching mode; the receiving end is composed of an annular antenna, a low-noise amplifier and a spectrum analyzer, the spectrum analyzer is used for detecting low-frequency signal characteristics in the shielding body, the low-frequency signal characteristics are substituted into the maximum shielding effectiveness estimation method, and the maximum shielding effectiveness value is obtained through calculation. The system is flexible, detection and analysis of wide-range electromagnetic pulse signals can be achieved by adjusting the frequency of transmitted signals and replacing corresponding transmitting and receiving antenna types, and therefore the system can be widely applied to shielding effectiveness measurement.

The application relates to the technical field of antennas, in particular to an omnidirectional array antenna which comprises a first frequency band antenna unit, a second frequency band antenna unit and a third frequency band antenna unit distributed from top to bottom on the outer ring surface of a ring-shaped antenna support, and the first, second and third frequency band antenna units are arranged around the central axis of the ring-shaped antenna support; the distribution positions of the first and third frequency band antenna units are consistent in the horizontal projection direction of the ring-shaped antenna support; the distribution position of the second frequency band antenna unit is staggered with the distribution positions of the first and third frequency band antenna units in the horizontal projection direction of the ring-shaped antenna support; the polarization directions of the first and third frequency band antenna units are staggered in the horizontal projection direction of the ring-shaped antenna support; and the polarization direction of the second frequency band antenna unit is parallel to the horizontal projection direction. The application can solve the problems of traditional antennas in the aspects of multifunction integration, multi-frequency band compatibility and efficient data transmission.

A multiband loop antenna includes a first, electrically conductive, L-shaped partial structure on a first layer of a printed circuit board. The first partial structure has a first resonant frequency and a feed point of the antenna. The multiband loop antenna includes a second, electrically conductive, L-shaped partial structure on the first layer of the circuit board. The second partial structure is configured for a second resonant frequency. The first partial structure and the second partial structure are capacitively coupled to one another in a coupling region. The multiband loop antenna includes an electrically conductive first reference region. The first partial structure and the second partial structure are disposed on the first layer of the circuit board in such a way that they form a loop together with the first reference region. A household appliance including a communication unit having the multiband loop antenna is also provided.

The invention discloses an implantable RFID (Radio Frequency Identification) tag device with a broadband high-gain antenna layout, and belongs to the field of RFID tags. Comprising a base body, a first connecting part, a second connecting part, a third connecting part, a chip and an antenna structure, the first connecting part, the second connecting part, the third connecting part, the chip and the antenna structure are arranged on the base body, a high-dielectric-constant ceramic substrate is attached to a folded loop antenna to be matched with an impedance circuit, and therefore the working bandwidth of the RFID tag capable of being implanted into an animal body is widened, and the working bandwidth of 902-928 MHz required by the RFID industry standard can be completely covered. The folded loop antenna is adopted, the space is fully utilized, the gain value of the antenna structure is improved, and the tag reading distance and efficiency are effectively improved. And the RFID tag is sealed and wrapped by the glass tube, so that the RFID tag has good insulation property, sealing property and corrosion resistance. And a relatively good clearance area is provided for the antenna, so that the radiation efficiency of the antenna is improved. The outer surface of the glass tube is coated with a biological container and a material, so that the biological living tissue cannot cause rejection reaction to the implanted RFID tag.

An electronic device is provided, comprising: a housing having a first surface facing a first direction and a second surface facing a second direction opposite to the first direction. The electronic device further comprises: a conductive pattern having a first conductive coil whose axis is substantially perpendicular to either the first or the second direction. The electronic device further comprises: a communication circuit configured to cause the first conductive coil to generate magnetic flux. The second surface comprises a first region made of a conductive material and a second region made of a non-conductive material. When viewed from the second surface, the first conductive coil is substantially disposed below the first region. The first conductive coil is configured to include: a first portion disposed near or on the second region to allow the magnetic flux to pass through the second region.

This application provides an antenna unit and an electronic device. A signal at a C-mode port and a signal at a D-mode port of a same loop antenna in any antenna unit are respectively excited by using two feeds, and the antenna unit is electrically symmetrically disposed, so that the signal at the C-mode port is self-cancelled at the D-mode port, and the signal at the D-mode port is self-cancelled at the C-mode port, to implement signal isolation between the two ports and interference self-cancel, and the signal at the C-mode port and the signal at the D-mode port can be complementary to each other in different radiation directions, to implement two antennas with high isolation and a low envelope correlation coefficient ECC based on the same loop antenna.

In one embodiment, a method implemented by an electromagnetic imaging system for imaging material within a metal container, the method comprising: transmitting to. and receiving signals from, a plurality of antennas attached to an interior wall of the metal container, the signals delivered over a plurality of channels, each of the plurality of antennas comprising a ferrite loaded, shielded half-loop antenna; measuring a plurality of scattering parameters (S-parameters) for all of the plurality of channels; calibrating the measurements; and providing an image of the material using an inversion algorithm based on the calibrated measurements.