42 results about "Spiral antenna" patented technology

A wideband spiral antenna system for a vehicle is provided. A planar spiral antenna is fabricated on a substrate. The planar spiral antenna includes an antenna feed. A first dielectric panel is disposed adjacent to a first side of the substrate. A dielectric puck has a first puck side disposed adjacent to the antenna feed on a second side of the substrate opposing the first side of the substrate. A radio frequency (RF) connector is disposed adjacent to a second puck side of the dielectric puck. The second puck side opposes the first puck side of the dielectric puck. One or more conductive vias extend from the antenna feed through the dielectric puck to the RF connector electrically coupling the antenna feed to the RF connector.

The application discloses a kind of plasma propulsion devices, belong to plasma electric propulsion technical field, comprising: discharge chamber, spiral antenna I, center arc structure, spiral antenna II, center compensation structure, radio frequency power supply and electromagnetic coil;Center arc structure is located in discharge chamber, spiral antenna I spiral is wound in the outer wall of discharge chamber, with the position opposite of center arc structure;Center compensation structure is located in discharge chamber, spiral antenna II spiral is wound in the outer wall of discharge chamber, with the position opposite of center compensation structure;Spiral antenna I and spiral antenna II are electrically connected with radio frequency power supply respectively;Two electromagnetic coils are wound and set in the outer wall of discharge chamber, respectively located in the two ends of spiral antenna II;Center compensation structure can release neutral particles under the action of heat;The application can improve ion number density, realize high specific impulse output of propulsion device, improve propulsion efficiency.

The utility model relates to the technical field of sensors, in particular to a miniature passive wireless sensor applied to temperature measurement of a high-speed motor rotor, which comprises a temperature sensing unit, a flexible connecting unit and a transmitting unit, and is characterized in that the temperature sensing unit comprises a surface acoustic wave resonator chip, a matching element and a temperature sensing end welding point; the transmitting unit comprises a spiral antenna unit, a fixed base and a transmitting end welding point. A first shielding layer, a second shielding layer and a third shielding layer are arranged, the first shielding layer and the second shielding layer which are good in conductivity are used for manufacturing a shielding cover and the like to surround an emission unit, a high-frequency magnetic field generates induction current on the surface of a metal shielding body, and a reverse magnetic field generated by the current can counteract part of an external magnetic field; and the first shielding layer is made of a permalloy plate, has high magnetic conductivity and can guide magnetic field lines to pass through the shielding layer, so that the magnetic field intensity of the space where the internal emission unit is located is greatly reduced.

A broadband spiral antenna system for a vehicle is provided. A planar spiral antenna is fabricated on a substrate. The planar spiral antenna includes an antenna feed. A first dielectric plate is disposed adjacent a first side of the substrate. A dielectric puck has a first puck side disposed adjacent the antenna feed on a second side of the substrate opposite the first side of the substrate. A radio frequency (RF) connector is disposed adjacent a second puck side of the dielectric puck. The second puck side is opposite the first puck side of the dielectric puck. One or more conductive vias extend from the antenna feed through the dielectric puck to the RF connector and electrically connect the antenna feed to the RF connector.

The invention belongs to the technical field of flexible hybrid electronics, and relates to a wireless passive sensing yarn based on multiple normal mode helical antennas and a preparation method thereof.The sensing yarn comprises a core yarn, a radio frequency chip and a sensing yarn antenna, the sensing yarn antenna is a whole formed by the multiple normal mode helical antennas spirally wrapping the core yarn, and the radio frequency chip is arranged on the core yarn; the plurality of normal mode helical antennas comprise a first conductor, a second conductor, a newly added third conductor and a newly added fourth conductor, and the first conductor, the radio frequency chip and the second conductor are connected in sequence; the third conductor forms a spiral coil in each spiral coil gap of the first conductor, and the fourth conductor forms a spiral coil in each spiral coil gap of the second conductor; the third conductor and the first conductor are not contacted, and the fourth conductor and the second conductor are not contacted. The impedance matching between the radio frequency chip and the sensing yarn antenna is good. The preparation method adopts a wrapping process. The sensing performance of the sensing yarn is stable, and the structure of the sensing yarn is miniaturized.

The application discloses an intelligent goods cabinet RFID reader-writer circular polarization array antenna and a preparation method thereof, and relates to the technical field of antennas.The circular polarization array antenna is composed of a plurality of unit antennas, the plurality of unit antennas are connected to form the circular polarization array antenna through a plurality of T-shaped power dividers, microstrip lines and impedance conversion microstrip lines, each unit antenna comprises a dielectric substrate, and the dielectric substrate is uniformly provided with a Wilkinson power division feeding network and four antennas.The application adopts a resonant four-arm spiral antenna structure, bends a copper sheet into an inverted F antenna form, reduces the size and improves impedance matching, feeds through a Wilkinson power division phase-shifting network, and realizes circular polarization of the antenna.The working frequency of the antenna can cover the most extensive 902MHz-928MHz frequency band standard.

The application relates to the technical field of antennas, in particular to a kind of four-arm spiral antenna. Four-arm spiral antenna includes ground plate, active radiation arm, passive radiation arm, active radiation arm and passive radiation arm are connected on ground plate respectively, active radiation arm feeds into differential signal to generate antenna resonance, passive radiation arm is coupled from active radiation arm of differential signal feed to generate parasitic resonance, two active radiation arms and two passive radiation arms are arranged in turn around the spiral symmetry structure of antenna center area, the parasitic resonance frequency of passive radiation arm deviates from the antenna resonance frequency of active radiation arm. The antenna structure significantly simplifies the feed structure, greatly reduces the manufacturing complexity and cost, while realizing high port isolation and stable circular polarization performance in compact layout.

A radio frequency device is characterized by having a spiral antenna and a radio frequency module, a first end of the spiral antenna is electrically connected with a radio frequency interface of the radio frequency module; the structure of the spiral antenna comprises a core material and a spiral conductor wound and fixed on the outer periphery of the core material; the material of the spiral conductor is single or multiple bundled metalized fibers or metal wires or carbon fiber wires, and the radius of each metalized fiber, metal wire or carbon fiber wire is less than 5 times of the skin depth when the radio frequency signal frequency is transmitted on the metalized fiber, metal wire or carbon fiber wire; the spiral antenna has an extremely high quality factor, thereby obtaining several times of communication distance compared with traditional spiral antenna under the same power.

The invention relates to the technical field of composite material structures, in particular to a structure and function integrated composite material spiral antenna tube and a manufacturing method thereof.The composite material spiral antenna tube comprises an inner structure layer, an inner layer adhesive film, a functional layer, an outer layer adhesive film and an outer structure layer which are sequentially arranged from inside to outside; the inner-layer adhesive film is respectively glued with the inner structural layer and the functional layer, and the outer-layer adhesive film is respectively glued with the functional layer and the outer structural layer; the inner structural layer and the outer structural layer are used for supporting the functional layer and participating in structural bearing of the aircraft, and the functional layer is used for realizing an antenna signal acquisition and conduction function; connecting pieces are arranged at the two ends of an inner cavity of the inner structure layer respectively and are in glue joint with the outer layer glue film. The functional layer comprises a sandwich, and a spiral copper wire is wound outside the sandwich. Through the design, the mechanical property and the wave-transparent property of the composite material and the information acquisition function of the antenna are mutually fused, and the composite material has the advantages of light weight, high strength, corrosion resistance, oxidation resistance and strong signal conduction and acquisition performance, and has structural bearing capacity.

The invention belongs to the technical field of wireless communication, and discloses a broadband circularly polarized wide-angle beam scanning antenna device based on a truncated Luneberg lens. Comprising a truncated Luneberg lens and an equiangular-Archimedes composite spiral feed source, the feed source adopts an equiangular spiral antenna at a high frequency and adopts an Archimedes spiral antenna at a low frequency, and 80% of relative bandwidth and good circular polarization characteristics are realized. The truncated luneberg lens is manufactured through a 3D printing process and is adaptive to a frequency band of 1.5-3.5 GHz, the truncated depth is 0.6 times of the radius to form a flat focal plane, and the refractive index gradient is 1.17-2.77. The flat focal plane is designed based on the Hamiltonian optical theory and supports feed source linear displacement to achieve + / -43-degree circular polarization wide-angle beam scanning. And the refractive index change is realized by the metamaterial structure units filled with the photosensitive resin by air in a layering manner. According to the invention, Hamiltonian optics, 3D printing and composite helical antenna technologies are integrated, and the antenna has broadband characteristics, high gain, low gain fluctuation and wide-angle scanning capability, and is suitable for various broadband wave beam scanning scenes.

A transponder (1) including an electronic system (3) for managing the sending and receiving of data and a spiral antenna (2), the spiral antenna (2) including a wound strip forming a plurality of coils (11), the electronic system (3) being connected to the spiral antenna (2) by two connection points (6) arranged on the strip. The coils (11) included between the two connection points (6) form a first set of coils (4), the spiral antenna (2) including a second set of coils (5) extending outside the connection points (6). Also, an electronic device, particularly a timepiece including such a transponder (1).

A planar spiral antenna resonator for fast manipulation of nuclear spin for qubit control in quantum computing and similar applications. The antenna exhibits wide bandwidth, and is configured with a central compact optical aperture for quantum sensing when coupled with a crystal lattice containing photo-luminescent defects, such as diamond with nitrogen-vacancy centers. The resonator features strong driving fields, with increased field-to-current ratios for rapid spin flips, exemplified by sub-microsecond proton quantum logic Pauli X-gate.

The invention provides an annular helical antenna array of an ocean laser microwave converged communication system, and relates to the technical field of laser microwave converged communication equipment. An annular antenna installation base perpendicular to the axial direction of the cylindrical metal shielding body is arranged on the periphery of the bottom of the cylindrical metal shielding body, and double-arm spiral antenna units are evenly arrayed in the circumferential direction of the annular antenna installation base. The double-arm spiral antenna unit comprises a double-spiral radiation conductor, a balun structure component and a feed port assembly which are electrically connected in sequence. The axial direction of the double-spiral radiation conductor is parallel to the axial direction of the cylindrical metal shielding body. The antenna unit adopts a double-arm spiral form, and a balun structure is introduced at a feed end to stabilize a relative phase relation between double arms, so that the unit presents a relatively good circular polarization characteristic in a required frequency band. The annular array formed by the plurality of spiral units is helpful for forming three-dimensional polarization consistency, and the adaptability of the system in a multi-path environment is improved.

The application discloses a single-feed sine spiral antenna based on a cross dipole structure and belongs to the technical field of wireless communication. The antenna comprises an upper layer radiation patch, a lower layer radiation patch, an upper layer medium, a lower layer medium, a ring-shaped parasitic metal patch and a coaxial connector; the upper layer radiation patch and the lower layer radiation patch each comprise two mutually orthogonal sine spiral structures, and the two sine spiral structures are connected through a phase shift loop; the upper layer radiation patch and the ring-shaped parasitic patch are respectively printed on the top and the bottom of the upper layer medium, and the lower layer radiation patch is printed on the bottom of the lower layer medium; the upper layer medium and the lower layer medium are concentrically attached together; the upper layer radiation patch and the lower layer radiation patch are respectively connected to the inner core and the outer shell of the coaxial connector to form a feed port; and the upper layer radiation patch and the lower layer radiation patch are centrally symmetrical with the medium circle center in a horizontal plane. The application has the broadband circular polarization characteristics of a traditional four-arm sine spiral antenna, is simple in structure and can meet the wireless communication requirements in different scenes.

The invention belongs to the technical field of medical instruments, and particularly relates to an efficient cryoablation needle which comprises a handle, a connecting pipe is fixed to one end of the handle, a needle rod is fixed to the end, away from the handle, of the connecting pipe, a needle head is fixed to the end, away from the connecting pipe, of the needle rod, and an expansion cavity is formed in the needle head. A transmission pipe is fixed to the other end of the handle, a connector is fixed to the end, away from the handle, of the transmission pipe, a fluid pipe and a coaxial cable are assembled in the connector, one end of the fluid pipe and one end of the coaxial cable extend into the expansion cavity, and an antenna is fixed to the position, located in the expansion cavity, of one end of the coaxial cable. A cooling working medium is input into the needle through the fluid pipe, so that the needle can perform cryoablation, microwaves are transmitted to the spiral antenna through the coaxial cable 1, so that the antenna can perform microwave ablation, and the device has the advantages of fast temperature rise, large ablation area, low cost and the like.

Provided herein are various enhanced antenna structures for radio frequency communications. In one example, an antenna a spiral antenna element having a single arm configured to couple to a radio frequency link at a central node. The antenna also includes a ground element comprising a conical frustum sharing an axis at the central node of the spiral antenna element and configured to couple to a ground reference for the radio frequency link.

A wideband spiral antenna system for a vehicle is provided. A planar spiral antenna is fabricated on a substrate. The planar spiral antenna includes an antenna feed. A first dielectric panel is disposed adjacent to a first side of the substrate. A dielectric puck has a first puck side disposed adjacent to the antenna feed on a second side of the substrate opposing the first side of the substrate. A radio frequency (RF) connector is disposed adjacent to a second puck side of the dielectric puck. The second puck side opposes the first puck side of the dielectric puck. One or more conductive vias extend from the antenna feed through the dielectric puck to the RF connector electrically coupling the antenna feed to the RF connector.

The utility model belongs to the technical field of satellite navigation antennas, and particularly discloses a double-arm spiral double-frequency circularly polarized navigation antenna, which comprises a cylindrical dielectric substrate and an antenna feed network, four radiation grooves with the same structure are etched on the upper surface of the cylindrical dielectric substrate, a spirally rising radiator spiral arm is arranged in each radiation groove, and the antenna feed network is connected with the antenna feed network. The bottom of the dielectric substrate adopts a power division-phase shifter for feeding, the reflection ground of the dielectric substrate is manufactured by adopting a copper coating process, the bottom end of the radiator spiral arm is connected with a microstrip line with the impedance of 50 ohms, and the microstrip line extends to the outer side of the common ground and the common plane. According to the double-arm spiral double-frequency circularly polarized navigation antenna, the size of the spiral antenna and a coaxial feed mode are optimized, so that the navigation antenna has excellent circularly polarized characteristics and impedance matching characteristics, and the navigation antenna has important significance for obtaining a solution from a new angle for the research of a satellite navigation antenna.

The invention relates to a microwave ablation needle with a circle-approaching antenna. The microwave ablation needle comprises a cable joint, a needle rod and a needle head, the needle is connected to the front end of the needle rod; a radiating antenna is arranged in the needle head, the inner end of the cable joint is connected with a coaxial cable, the other end of the coaxial cable extends into the needle head from the inside of the needle rod, and an inner conductor of the coaxial cable is electrically connected with the radiating antenna; the radiating antenna comprises a plurality of spiral parts which are sequentially connected end to end. Compared with a traditional linearly polarized antenna, the spiral antenna can generate a rotating electromagnetic field, so that energy is distributed more uniformly in tissues, and an ablation area closer to a sphere is formed. In addition, the spiral antenna has the advantages of being wide in frequency band, high in gain, good in directivity and the like, and technical support is provided for achieving accurate and controllable microwave ablation. A traditional linearly polarized antenna often generates an ellipsoidal or teardrop-shaped ablation area, but according to the scheme, an approximately spherical ablation area is more easily generated through a rotating electromagnetic field generated by a spiral antenna.

The present application relates to the field of electronic tags, in particular to a high-frequency universal electronic tag antenna assembly and an electronic tag. The present application discloses a high-frequency universal electronic tag antenna assembly and an electronic tag, wherein the electronic tag antenna assembly comprises a substrate, a planar spiral antenna body, a plurality of chip pad assemblies and a plurality of communication units, the planar spiral antenna body and the plurality of chip pad assemblies are arranged on the front surface of the substrate, the plurality of communication units are arranged on the back surface of the substrate, the plurality of communication units correspond to the plurality of chip pad assemblies one by one, and are used for connecting the plurality of chip pad assemblies to different positions of the antenna body respectively, the communication units and the chip pad assemblies are insulated by the substrate and can be connected to each other through the perforations. The electronic tag antenna assembly of the present application can be compatible with a plurality of high-frequency tag chips, is simple to use, is convenient for production and management, has low cost, and has a simple structure and is easy to implement.

The utility model discloses a tire RFID electronic tag comprising a carrier plate, a chip and an antenna, the chip is arranged on the carrier plate, and the antenna is connected with the chip; the antenna is of a spiral structure, an end portion used for being inserted into the antenna in the axial direction of the antenna is formed on the carrier plate, blocking pieces are arranged on the two sides of the end portion in a protruding mode, a boss is arranged in the middle of the carrier plate in a protruding mode, and the antenna abuts against the blocking pieces and the boss in the axial direction. According to the utility model, the spiral antenna is adopted and is in axial insertion connection with the carrier plate, and the boss and the separation blade are arranged at the middle part and the end part of the carrier plate, so that when the antenna is connected with the carrier plate, a part of the antenna between the boss and the separation blade is subjected to axial double-side abutting and limiting, and therefore, the carrier plate and the antenna are effectively and reliably fixed; therefore, subsequent welding and other production work are facilitated, and the yield is effectively improved.

Disclosed herein, among other things, are apparatus and methods for a high-efficiency antenna for hearing assistance device wireless communication. In various embodiments, a hearing assistance device includes a housing, a power source within the housing, and a radio circuit within the housing and electrically connected to the power source. A circular polarized spiral antenna is provided within the housing in various embodiments, the antenna configured to provide two electric field components configured to be used for wireless communications for the hearing assistance device. The device further includes a transmission line connected to a center of a spiral of the antenna and configured to electrically connect to the radio circuit, according to various embodiments.

The present application provides a spiral antenna. The spiral antenna comprises a feeding plate and four radiation elements. The feeding plate is configured to feed a signal and comprises a top surface. The four radiation elements are electrically connected to the feeding plate respectively and spirally surround a dielectric space away from the feeding plate respectively in the same direction, wherein the four radiation elements are arranged in a ring shape and are circular in any cross section parallel to the top surface of the feeding plate. Each of the radiation elements comprises a feeding unit and a radiation part. The feeding unit comprises a shorting part and a feeding part, wherein one end of the shorting part is connected to the feeding plate, the feeding part is arranged on one side of the shorting part with a spacing, and one end of the feeding part is connected to the feeding plate. The radiation part is configured to generate a wireless signal transmission and reception in a first frequency band. One end of the radiation part is connected to the shorting part, and the other end of the radiation part is connected to the feeding part.

The invention provides a helical antenna, an antenna device and an automobile. The spiral antenna comprises a spiral radiator, the spiral radiator comprises a plurality of first spiral sections and a plurality of second spiral sections, the plurality of first spiral sections and the plurality of second spiral sections are alternately arranged in the winding direction of the spiral antenna and are connected in series, the plurality of first spiral sections at least support a first working frequency band, and the plurality of second spiral sections at least support a second working frequency band. The second spiral sections at least support the second working frequency band, and the rotation radius of the second spiral sections is smaller than that of the first spiral sections. The antenna device comprises a spiral antenna and a floor assembly, the floor assembly comprises a bottom plate and a side wall, the bottom plate and the side wall surround to form a containing cavity with an opening in one end, the spiral antenna comprises a feed end, and the feed end is located in the containing cavity. The single spiral radiator has two spiral sections with different rotation radiuses, different working frequency bands can be supported, the spiral radiator is simple in structure and convenient to process, the production cost is reduced, and the size of the spiral antenna is reduced.

The application provides a high-temperature superconducting magnet magnetic confinement plasma thrust device, belonging to the technical field of space electric propulsion, and using a superconducting magnet to replace a conventional magnet, which is compact in structure and high in reliability. In the application, a vacuum ceramic tube is inserted at a center axis, a spiral antenna with different sizes is sleeved on different functional areas of the vacuum ceramic tube, a Dewar No.1 is sleeved on the right side of the ceramic tube, a radio frequency hole is opened on the upper part of the Dewar No.1 to connect a radio frequency flange, a refrigeration hole is opened on the lower part of the Dewar No.1 to connect a refrigeration flange, a Dewar No.2 is sleeved on the left side of the ceramic tube, a radio frequency hole is opened on the upper part of the Dewar No.2, the Dewar No.1 and the Dewar No.2 are connected through flanges, a main framework with a flange is sleeved on an inner barrel of the Dewar No.1, a superconducting magnet assembly is placed on the main framework, a split magnet is compressed through an epoxy compression end cover and a screw rod, insulation is performed through alternately inserting insulating epoxy plates and insulating aluminum plates between the split magnets, and a shell wiring assembly is inserted into a flange opening of the Dewar No.2. The application realizes conduction cooling of a superconducting magnet assembly.

The application discloses an antenna-coupled micro-bridge structure for a small-pixel microbolometer and a preparation method thereof, and belongs to the technical field of photoelectric detection. The spiral antenna and the electrode bridge leg are arranged alternately, the proportion of the small-pixel micro-bridge structure thermal isolation support bridge leg is improved, the bridge leg is lengthened, the thermal conductivity is reduced, and the temperature rise of the microbolometer is improved; when the spiral antenna arm is used for coupling the thermal sensitive unit to receive infrared radiation, the absorption of light energy can be more concentrated on the thermal sensitive unit, the temperature rise of the thermal sensitive unit is further improved under the condition that the total light absorption rate of the device is similar, the effective absorption area of the micro-bridge structure is equivalent to being increased, compared with the traditional microbolometer, energy can be better collected, and the detection efficiency is improved; while low thermal conductivity and high absorption rate are obtained, the thermal mass of the micro-bridge structure is reduced; the double-layer micro-bridge structure of the traditional upper absorption layer and the lower thermal isolation layer is replaced, the preparation process is simplified, and the device manufacturing cost can be reduced.

The application discloses an agricultural sensor adaptive topology networking device, method and storage medium. The device comprises a sink node and a plurality of sensor nodes, the sensor node comprises a microcontroller module, an environment perception module and a multi-mode radio frequency transceiver module, the microcontroller module reads the current relative humidity and photosynthetically active radiation attenuation rate, calculates the directed link cost, and when the directed link cost exceeds the cost threshold and the current packet loss rate change slope is greater than zero, the omnidirectional microstrip antenna is cut off and the directional spiral antenna is turned on, the media access control layer radio frequency transmission power is improved, and the network topology reconstruction is initiated by executing the directional routing request with the direction identifier. The application can solve the problem of route response lag caused by passive detection, and improve the stability of network structure and communication data.

In order to enable generation of plasma with higher density in a container with larger capacity, a plasma generating device according to this disclosure is includes a high-frequency circuit (20) having an inductive load and a high-frequency power supply (22) which supplies high-frequency power to the inductive load and a reaction container which is configured capable of pressure reduction and in which plasma is generated by applying the high-frequency power to the inductive load. The inductive load is constituted by a spiral antenna coil (21) disposed so as to surround a periphery of the reaction container, and the antenna coil is divided into at least two or more parts. The high-frequency circuit (20) has a plurality of paths (23) on which each of the antenna coils (21) divided into at least two or more parts is provided.

The invention discloses a compact three-frequency-band hemispherical beam combined antenna, which comprises a metal base, an azimuth turntable and UHF (Ultra High Frequency), L and S-frequency-band antennas. The UHF antenna is installed on the rotary table at an inclination angle of 35 degrees, and hemisphere coverage is achieved through rotation. The L antenna and the S antenna are installed on the two sides above the UHF antenna through a glass fiber support, and a low-profile microstrip antenna form and a four-arm spiral antenna form are adopted respectively. Through the UHF antenna 45-degree polarization design, the high-frequency antenna feeding point bias and the feeder common ground structure, mutual coupling between frequency bands is effectively inhibited. The overall size of the antenna is about phi 250 mm * H350 mm, the three frequency bands all have good hemispherical wave beams, low standing-wave ratios and optimal circular polarization performance, the antenna is suitable for mobile satellite communication equipment, and the integration level and the multifunctionality are improved.