103 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.

An electromagnetic (EM) probe for monitoring at least one biological tissue. The EM probe comprises a spiral antenna conductor (not shown) and an EM radiation absorbing layer (92) mounted along the antenna. The EM radiation absorbing layer has a plurality of substantially concentric frame shaped regions (93A-C) corresponding to portions of said spiral antenna having equal surface of antenna conductor, any of said plurality of concentric frame shaped regions has an EM radiation absorption coefficient different than any other of said neighboring concentric frame shaped regions.

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 invention relates to a rapid antenna anti-collision detection method, which can independently operate in a control box of a helical antenna or can operate in a control box of a plurality of helical antennas in a matched manner, so that the helical antenna does not generate collision risk, and a collision detection result can be rapidly and efficiently calculated. The method comprises the following steps: 1) establishing a three-dimensional coordinate system on the basis of rotary tables and mounting planes of two antennas; 2) taking the horizontal and pitching angles of the rotary table and the length of the antenna as input parameters of collision detection; 3) calculating a projection relation between an XY plane and a YZ plane based on coordinate projection; and 4) judging the collision risk according to a calculation result. According to the invention, the problems that the resource occupation is too high and the detection speed is not timely when the single-chip microcomputer in the control box carries out collision risk detection are solved, and the operation efficiency of the control box is improved through an optimized algorithm.

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.

Provided are an antenna device and a relay in which a wider band is achieved.　The antenna device comprises: a spiral antenna that is provided facing a window glass and that transmits and receives radio waves in a first frequency band; and a transmission unit that is connected to the spiral antenna, transmits a signal of the first frequency band, and transmits and receives radio waves in a second frequency band lower than the first frequency band.

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.

Provided is an antenna device that is small and low-profile, can reduce parasitic capacitance, and can be mixed with other media antennas without obstacles. The AM / FM antenna (13) is constructed by fixing a pair of capacitor-loaded vibrators (131, 132) to a retaining frame (133) through a fixing hole (1321), and fixing a helical antenna (134) at the bottom of the retaining frame (134). The capacitor-loaded vibrators (131, 132) are centered on a plane perpendicular to the roof and are opposite to each other at a specified interval and a specified angle. In addition, connecting parts are provided at locations lower than the upper edge, and are connected to each other via each connecting part. The edges of the capacitor-loaded vibrators (131, 132) are of a size that does not interfere with, for example, the SDARS antenna (14) and the GNSS antenna (19).

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 present invention discloses a dual-frequency four-arm helical antenna for low-orbit satellite communication, including a direct-feed helical unit, a coupled-feed helical unit, an antenna reflective base plate and a feeding network; the tops of the direct-feed helical unit and the coupled-feed helical unit are open-circuited and installed on the antenna reflective base plate in a coaxial nested manner; the coupled-feed helical unit is connected to the grounding point of the coupled-feed helical arm; the direct-feed helical unit is connected to the feeding point of the direct-feed helical arm; the feeding network is installed on the antenna reflective base plate, connected to multiple direct-feed helical arm feeding points, and is used to feed multiple direct-feed helical arms. The present invention simultaneously satisfies the dual-band operation of the four-arm helical antenna, and both dual-bands have approximately the same heart-shaped radiation pattern, so that the low-orbit satellite can have the best effect in both receiving and transmitting when communicating at a low elevation angle of the terminal.

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 invention discloses a preparation method of a superconducting niobium nitride thermal electronic bolometer. A silicon oxide / silicon double-layer substrate is adopted; the method comprises the following steps: growing a niobium nitride film on a silicon oxide surface of a substrate through radio frequency magnetron sputtering to serve as a buffer layer, and growing a niobium nitride film through direct current magnetron sputtering; drawing an external electrode through ultraviolet exposure of the double-layer photoresist, growing a titanium film and a gold film through magnetron sputtering, and preparing an electrode by lift-off stripping; drawing a planar helical antenna pattern through electron beam exposure, growing a titanium thin film and a gold thin film through magnetron sputtering, and preparing the antenna by utilizing lift-off stripping; defining a microbridge pattern through electron beam exposure, and transferring the microbridge pattern to the niobium nitride film through reactive ion etching; an area needing to be etched is defined on a substrate silicon surface through ultraviolet exposure, silicon is etched off through an FSE deep silicon etching machine, and a suspension bridge structure is prepared. According to the invention, the working temperature is increased to 9 K, and the sensitivity is still at a pw / Hz 1 / 2 magnitude.

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 utility model relates to a strapping type temperature measurement sensor structure. A cap of the temperature measurement sensor structure is provided with an accommodating inner cylinder, a helical antenna is arranged in the accommodating inner cylinder, one end of the helical antenna is welded and attached to a temperature measurement circuit board and is electrically connected with the temperature measurement circuit board, and the other end of the helical antenna is tightly attached to the bottom surface of the accommodating inner cylinder; a square groove is formed in an opening of the containing inner cylinder, the temperature measuring circuit board and the copper plate base are fixed in the square groove, and the temperature measuring circuit board is arranged between the copper plate base and the spiral antenna. The back surface of the copper plate seat is attached to the temperature measuring circuit board, and the front surface of the copper plate seat faces outwards; the cap is provided with two arc-shaped channels used for allowing binding belts to penetrate through, and the two arc-shaped channels are parallel to each other and arranged on the two sides of the containing inner cylinder. When the technical scheme of the utility model is used, the whole temperature measurement sensor is bound on the surface of the cable by adopting the binding belt, and the temperature change of the cable can be detected by the temperature measurement circuit board, so that the corresponding temperature monitoring on each cable can be realized, and the requirement of temperature measurement is met.

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.