86 results about "Spiral antenna" patented technology

The invention relates to the technical field of antennas, in particular to a quadrifilar helix antenna. The four-arm-like helical antenna comprises a grounding plate, an active radiation arm and a passive radiation arm, the active radiation arm and the passive radiation arm are connected to the grounding plate, differential signals are fed into the active radiation arm to generate antenna resonance, and the passive radiation arm is coupled to the active radiation arm which feeds the differential signals to generate parasitic resonance. The two active radiation arms and the two passive radiation arms are sequentially arranged in a spiral symmetrical structure around the central area of the antenna, and the parasitic resonance frequency of the passive radiation arms deviates from the antenna resonance frequency of the active radiation arms. According to the antenna structure, the feed structure is remarkably simplified, the manufacturing complexity and cost are greatly reduced, and meanwhile, high port isolation and stable circular polarization performance are realized in a compact layout.

The invention belongs to the technical field of antennas, and relates to a circularly polarized antenna array, which comprises four antennas distributed in an array, the antenna comprises a first radiation layer, a first dielectric layer, a second radiation layer, a second dielectric layer and a floor layer which are sequentially stacked from top to bottom, the first radiation layer comprises two spiral radiation arms which are arranged at an interval and are distributed in a central symmetry manner so as to form a circularly polarized spiral antenna; the second radiation layer and the first radiation layer are connected and have the same structure; the first radiation layer and the second radiation layer are connected with the feed structure; the radiation arms comprise a first radiation arm and a second radiation arm; the initial ends of the first radiation arm and the second radiation arm are arranged in the middle of the first dielectric layer, the terminal of the first radiation arm is arranged in the middle of the antenna array, and the terminal of the second radiation arm is arranged at the corner of the antenna array. According to the invention, ultra wide band, high gain, circular polarization and interference resistance can be realized at the same time, the axial ratio performance is good, and miniaturization is facilitated.

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 present invention relates to the technical field of communication antenna equipment, and in particular to a dual-frequency four-arm helical antenna structure and its design optimization and control method. The dual-frequency four-arm helical antenna includes an FPC substrate, and the FPC substrate is made of polyimide material. Four helical antennas are integrated on the FPC substrate. The material of the helical antenna is made of electrolytic copper foil conductor. The total thickness of each helical antenna is less than 0.15 mm, and the four helical antennas are arranged on the FPC substrate in a 90° directional spiral form to enhance the directionality and gain rate of signal transmission. Each spiral antenna is independent of each other and has a phase difference. The present invention proposes an innovative dual-band four-arm helical antenna design that achieves precise frequency control and performance balance of dual bands through precise structural parameter optimization. It not only has good radiation characteristics and a wide bandwidth, but also effectively reduces interference between frequency bands, and solves the problems of frequency accuracy, size and weight existing in the prior art.

The invention discloses a dual-frequency four-arm helical antenna with ultra-low profile and wide-angle radiation characteristics. The dual-frequency four-arm helical antenna comprises a first circular ring dielectric substrate, sickle-shaped radiation arms, an FPC dielectric substrate, helical radiation arms, a circular ring-shaped support, a covering film, a floor and a coaxial feed. The antenna can realize wide axial ratio beam width, wide half-power beam width and relatively high gain in a working frequency band range of satellite navigation, has an ultra-low profile, can be used for realizing an unmanned aerial vehicle-mounted satellite navigation terminal with low wind resistance and high sensitivity, and effectively improves the positioning precision and speed of a high-speed motion carrier.

The invention relates to the technical field of communication antenna equipment, in particular to a double-frequency four-arm helical antenna structure and a design optimization and control method thereof. The double-frequency four-arm spiral antenna comprises an FPC base material, the FPC base material is made of polyimide materials, four spiral antennas are integrated on the FPC base material, the spiral antennas are made of electrolytic copper foil conductors, the total thickness of each spiral antenna is smaller than 0.15 mm, the four spiral antennas are arranged on the FPC base material in a 90-degree directional spiral mode, and the thickness of each spiral antenna is smaller than 0.15 mm. And the helical antennas are used for enhancing the directivity and gain ratio of signal transmission, are mutually independent and have phase differences. The invention provides an innovative dual-band four-arm helical antenna design which realizes dual-band accurate frequency control and performance balance through accurate structural parameter optimization, not only has good radiation characteristics and wide bandwidth, but also effectively reduces interference among the frequency bands; the problems of frequency precision, size, weight and the like in the prior art are solved.

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 present invention provides a high-gain axial mode helical antenna resistant to strong vibrations, and relates to the field of antenna technology. The axial mode helical antenna comprises: a thin-walled support structure, a radome and a helical wire; the thin-walled support structure comprises: a central sleeve, a rib plate and an arc plate; the helical wire is installed on the thin-walled support structure, and the thin-walled support structure is fixedly installed in the radome; the thin-walled support structure adopts a configuration with high bending load-bearing efficiency, which can reduce the dependence on high-rigidity and high-strength materials. The structure adopts a two-dimensional weaving process to meet the needs of engineering use. Compared with the current antenna support tube formed by an expensive three-dimensional weaving process, the cost of the satellite-borne helical antenna can be significantly reduced; and the thin-walled support structure significantly improves the antenna vibration fundamental frequency and the root stress during the vibration process under the premise of controlling the weight, and additionally enhances the system's bearing capacity and the bending strength of the cantilever root.

The invention discloses a large-size spiral deployable antenna, and relates to the technical field of spiral antennas. Comprising a main rod and an auxiliary rod, a through hole and a plurality of movable holes are formed in the outer wall of the top of the main rod, a fixing ring is fixedly arranged on the top of the inner wall of the main rod, and a plurality of U-shaped seats are fixedly arranged on the outer wall of the bottom of the fixing ring. The control ring is pressed to drive the supporting rod to move downwards, the supporting rod abuts against the surface of the limiting clamping plate downwards, the limiting clamping plate is stressed to rotate downwards, the limiting clamping plate is separated from the auxiliary rod, the auxiliary rod can be adjusted upwards or downwards, after adjustment is completed, the control ring is loosened, and the control ring and the supporting rod reset upwards under the elastic effect of the compression spring. After the stress on the limiting clamping plate disappears, the limiting clamping plate rotates upwards under the elastic action of the torsion spring, the auxiliary rod is clamped and fixed again, the folding and unfolding of the large-size helical antenna can be realized through the arranged adjustable auxiliary rod, the weight and the size of the large-size helical antenna are reduced, and the installation space of the helical antenna is greatly reduced.

The invention discloses an ultra-wideband receiving and transmitting four-arm helical antenna system, which realizes a receiving and transmitting shared antenna and a receiving and transmitting simultaneous antenna of which the antenna volume is greatly reduced, and can drain radiation current to a metal cavity under the condition of not increasing the additional volume of the antenna, thereby improving the impedance matching and gain of the antenna. The use of a wave-absorbing material is reduced, and the gain of the antenna is improved; a decoupling beam forming feed network is used for decoupling, so that high isolation of a transmitting port and a receiving port in a wide frequency band can be realized under the influence of adverse factors such as common caliber between transmitting and receiving antennas, large decoupling difficulty caused by a small distance between the transmitting antenna and the receiving antenna and the like; high isolation between an upper transmitting port and a receiving port can be realized in a wide frequency range, and meanwhile, the antenna has a simple beam forming feed network, considerable profile height, good standing-wave ratio characteristic and good far-field performance parameters. The antenna is widely applied to the technical field of antennas.

1. The name of this design product: Satellite-borne conical spiral antenna (X-band). 2. Purpose of this design product: This design product is used for sending and receiving X-band radio signals. 3. The key point of the design of this product lies in the shape of the product. 4. The picture or photo that best illustrates the design points: three-dimensional picture. 5. The front and rear views of this design product are symmetrical, and the rear view is omitted; the left and right views of this design product are symmetrical, and the right view is omitted.

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.

The invention discloses a miniaturized axial mode helical antenna based on artificial surface plasmon, comprising a plastic cylindrical support structure, a metal structure wound on the plastic cylinder and a metal floor at the lower layer. The metal structure comprises an artificial surface plasmon structure and a matching structure located below it. The artificial surface plasmon structure comprises 5 turns of artificial surface plasmon unit structure wound along the axial direction of the plastic cylinder, which is directly connected to the matching structure; the matching structure comprises a microstrip line structure for adjusting the input port impedance and a metal feeding probe. The invention reduces the length of the metal strip by 20%, while the physical aperture, height and volume are reduced by 36%, 20% and 49% respectively. The invention has good axial mode radiation performance and right-hand circular polarization (RHCP) characteristics, and also has the characteristics of high bandwidth and high gain, and is simple to process and low in cost, which helps to improve the system integration of wireless communication technology.

A grating antenna includes a waveguide, a plurality of groove structures, arranged inwards on a surface of the waveguide and periodically along a light transmission direction; a plurality of grating structures, arranged outwards on two sides of the waveguide, symmetrically and periodically in the light transmission direction; a period size of the groove structures is consistent with a period size of the grating structures, the groove structures and the grating structures have a certain relative displacement offset in the light transmission direction, and an intensity of a first radiation light field generated by the groove structures is substantively equal to that of a second radiation light field generated by the grating structures. According to the disclosure, a high-efficiency unidirectional radiation characteristic of the grating antenna in a free-space can be realized, and a radiation efficiency of the grating antenna does not oscillate along with wavelength in a target wavelength domain.

1. Name of the Design Product: Spaceborne Conical Spiral Antenna (S Band). 2. Use of the Design Product: The design product is used for transmitting and receiving S-band radio signals. 3. Design Key Points of the Design Product: Lies in the shape of the product. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective view. 5. The front and rear views of the design product are symmetrical, so the rear view is omitted; the left and right views of the design product are symmetrical, so the right view is omitted.

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.

The present invention proposes an equiangular spiral antenna for seismic logging, comprising a dielectric substrate and a metal patch located on the upper surface of the dielectric substrate. The metal patch constitutes the two arms of the novel equiangular spiral antenna, and the two arms are centrosymmetrical around the center point of the dielectric substrate, and their shapes and boundaries are composed of spiral lines and circular arcs. Unlike traditional equiangular spiral antennas, which usually have feeding points at the inner ends of the two arms, the feeding points of the present equiangular spiral antenna are at the outer ends of the two arms. Both arms of the antenna are above the dielectric substrate and are centrosymmetrically distributed at the center of the circular dielectric substrate. The novel equiangular spiral antenna proposed in the present invention utilizes the characteristics of the wider bandwidth of the equiangular spiral antenna and is made of flexible materials to better fit the well wall environment during logging, thereby realizing the reception of seismic signals and having a high signal-to-noise ratio, and has broad application prospects.