1177 results about "Dielectric plate" patented technology

The invention discloses an ultra-wideband low-profile dual-polarization curved surface phased-array antenna, and belongs to the field of antenna engineering technology and wireless communication. The phased-array antenna comprises a plurality of pitching surface sub-arrays which are arranged along the axial direction; the pitching surface subarray is composed of a plurality of curved surface antenna units which are uniformly distributed along the circumference, and the whole pitching surface subarray is fan-shaped; the curved antenna unit comprises a curved dielectric block, a metasurface matching layer, a radiator layer, a vertical feed balun, a wave-absorbing resistance layer and a metal floor layer, wherein the metasurface matching layer and the radiator layer are conformally arranged on the upper surface and the lower surface of the curved dielectric block. According to the antenna, the flexible dielectric plate is used as a carrier of a radiation dipole and is matched with the PCB metal floor, so that the normal active standing-wave ratio of the antenna is smaller than 3.0 in ten octaves in two linear polarization directions of horizontal polarization and vertical polarization, and + / -60-degree scanning is realized in an azimuth plane.

The invention discloses a liquid metal-based polarized reconfigurable radiation-scattering integrated antenna array, which is composed of four sub-arrays, each sub-array comprises a metasurface antenna layer, a metalized ground layer and a feed network layer, the metasurface antenna layer is formed by periodically arranging units and is placed on the upper surface of a first dielectric plate, and the metalized ground layer is arranged on the upper surface of the first dielectric plate. The antenna is mainly used for realizing circular polarization radiation and reducing a radar cross section. The feed network layer is mainly composed of Wilkinson power dividers and is placed on the lower surface of the second dielectric plate; and a metalized ground layer is arranged between the two dielectric plates. In the feed network layer, the signal transmission path of the feed network is changed by regulating the position of the liquid metal, so that the polarization reconfigurable function of the sub-array is realized; according to the invention, the reduced bandwidth of the radar cross section of the antenna array is expanded by arranging the sub-arrays at different heights. According to the invention, the liquid metal is adopted to control the feed network, the reconstruction of antenna polarization is realized, and the working bandwidth of radar scattering reduction is widened through the unequal-height placement of the sub-arrays.

The invention discloses a radiation-receiving type low-profile dual-beam array antenna and a folding decoupling design method. The low-profile dual-beam array antenna is composed of a transmission metasurface, a polarization conversion metasurface and a horn feed source. The transmission metasurface is formed by periodically extending and arranging m * m radiation-receiving units in a plane at equal intervals, and efficient transmission and spin decoupling focusing phase regulation and control of electromagnetic waves of a specific frequency band are achieved. The radiation-receiving unit is composed of three layers of metal and two layers of dielectric plates. The polarization conversion metasurface is formed by periodically extending and arranging n * n polarization conversion units in a plane at equal intervals, and efficient reflection, polarization conversion and wave beam non-mirror image deflection phase regulation and control of electromagnetic waves of a specific frequency band are achieved. The polarization conversion unit is composed of two layers of metal and a layer of dielectric plate. The low-profile dual-beam array antenna provided by the invention can generate two independently regulated orthogonal circularly polarized waves through spin decoupling under the excitation of a circularly polarized wave feed source, and has the remarkable advantages of high aperture efficiency, low profile and the like.

A modular structure supports elevated rail segments for delivering electrical power to a moving work machine, such as a hauler at a mining site. Opposite ends of a roadside barrier contain complementary tubular couplers arranged vertically. A lower end of a dielectric post positioned in one of the tubular couplers has opposing dielectric plates at an upper end. A top edge of each plate has a creepage concavity between a pair of rail recesses. Another dielectric post of similar configuration is positioned in the other of the tubular couplers. Holes within the couplers and the posts ensure alignment of respective rail recesses in which conductive rails are placed. Dielectric inserts frictionally lock the rails into the rail recesses.

The invention discloses a co-packaging type optical engine module and networking. The co-packaged optical engine module comprises a photonic integrated chip and a processor bare core, and the photonic integrated chip is stacked above the processor bare core and electrically connected with the processor bare core; the photonic integrated chip is configured to transmit and receive data in an optical signal mode, and an optical signal transmitting and receiving end of the photonic integrated chip is located on one side far away from the processor bare core; the processor die is configured to process the data. According to the scheme provided by the invention, intermediate substrates such as a silicon dielectric plate and an adapter plate are canceled, the transmission path is further shortened, the data transmission efficiency is improved, in addition, the signal loss can be remarkably reduced by the tight coupling, and the high-speed signal integrity is improved.

The utility model discloses a double-frequency circularly polarized fusion antenna with a large frequency ratio, which comprises a first dielectric plate and a second dielectric plate, the first dielectric plate is positioned above the second dielectric plate, and the lower surface of the first dielectric plate is a copper-clad layer serving as a grounding plate. And a first metal radiator, a second metal radiator, a third metal radiator and a fourth metal radiator are arranged on the upper surface of the antenna. One end, close to the center of the dielectric plate, of the radiator is loaded with a metal column and connected with the grounding plate, and one end, away from the center of the dielectric plate, of the radiator is loaded with a millimeter wave metal probe. A microwave feed network and four 180-degree phase difference power dividers are arranged on the lower surface of the second dielectric plate, an output port of the microwave feed network is connected with the four microwave metal probes, and output ports of the 180-degree phase difference power dividers are connected with the eight millimeter wave metal probes. The dual-frequency circular polarization antenna has a dual-frequency circular polarization characteristic, can effectively reduce the influence of a multipath effect, and achieves the multiplexing of the radiator, thereby reducing the demands for the space resources of communication equipment.

The invention relates to an ultra-wideband frequency reconfigurable tight coupling dipole array with wide beam scanning. The ultra-wideband frequency reconfigurable tight coupling dipole array comprises a plurality of antenna units, the antenna unit comprises a tight coupling dipole radiation unit, a reconfigurable layer, a wide-angle impedance matching structure, a feed structure and a metal floor; the wide-angle impedance matching structure, the tight coupling dipole radiation unit and the feed structure are sequentially located on the first dielectric plate from top to bottom, and the first dielectric plate is placed perpendicular to the horizontal plane. The reconfigurable layer, the metal floor and the first dielectric plate are vertically arranged in an intersecting mode, and the reconfigurable layer is located above the metal floor. The reconfigurable layer and the double-layer double-sided capacitor loading ring structure are used for achieving the frequency reconfigurable function of the ultra-wideband array, and meanwhile the high radiation efficiency and the large-angle scanning capacity of the ultra-wideband array are effectively guaranteed. In addition, the invention also designs a feed structure containing a capacitor loading short-circuit pin, so that no common-mode resonance in the working frequency band of the ultra wide band is ensured.

The invention discloses a mirror symmetry correlation receiving radiation metasurface and a polarization and complex amplitude regulation and control method thereof. The polarization state of the receiving and radiating end of the metasurface and the complex amplitude regulation and control method from any polarized wave to any polarized wave are regulated and controlled by controlling the in-plane mirror symmetry of the receiving and radiating metasurface patch structure. The polarization and complex amplitude regulation and control method is realized by a receiving and radiating metasurface, the metasurface structure is composed of five layers of metal and four layers of dielectric substrates, and the total thickness is about 0.086 lambda. Wherein the first-layer structure and the fifth-layer structure consist of circular rings with two pairs of arc-shaped grooves etched at the edges and C-shaped grooves etched at the centers; the relative rotation angle of the C-shaped groove and the arc-shaped groove is changed to control the elliptical angle of electromagnetic waves, the overall rotation angle of the C-shaped groove and the arc-shaped groove controls the polarization angle of the electromagnetic waves, and the opening size of the C-shaped groove is used for regulating the transmission amplitude; the transmission phase is regulated by changing the length of the third-layer transmission line; meanwhile, the four layers of dielectric plates are used for isolating radiation and receiving modes. The metasurface and the method have the ultra-thin characteristic and the ultra-high pixel resolution.

The invention discloses an ultra-wideband balancer applied to high-power microwave measurement and a manufacturing method and device. The ultra-wideband balancer comprises a thick slot line layer, a microstrip line dielectric plate and a microstrip line layer, wherein the microstrip line dielectric plate and the microstrip line layer are stacked on one side of the thick slot line layer in the second direction, and the microstrip line layer is provided with an output port; the first input port and the second input port are respectively connected with an SMA connector, the phase difference of input signals of the two SMA connectors is 180 degrees, and the output port is connected with an SMA connector; a resonant cavity and a thick slot line resonator are formed between the first thick slot line structure and the second thick slot line structure, and the thick slot line resonator and the microstrip line layer form electromagnetic coupling, so that an input signal which is input by the first input port and the second input port and has a phase difference of 180 degrees is output from the output interface as an anti-phase microwave synthesis signal; the ultra-wideband balancer has larger power capacity, the problem that the power capacity is limited due to the fact that the slot line is too thin is solved, and the ultra-wideband balancer applied to high-power microwave measurement has larger power capacity.

The embodiment of the invention provides an antenna decoupling structure, an antenna array and communication equipment, which are used for improving the problem of mutual coupling of antennas. The antenna decoupling structure comprises a dielectric plate, two scatterers and a load. The two scatterers are arranged on the first surface of the dielectric plate and are oppositely arranged along a first direction, and the first direction is parallel to the first surface. The load is electrically connected between the two scatterers, the load and the two scatterers form a resonant structure with an opening, and the opening is located between the two scatterers. The antenna decoupling structure provided by the embodiment of the invention can be applied to an antenna array, and the antenna array can be applied to communication equipment, so that the problem of mutual coupling of antennas is solved, and the communication efficiency is improved.

The invention discloses an omnidirectional broadband high-gain rectification antenna which comprises an antenna unit radiation structure, an antenna unit radiation patch, an upper dielectric plate, a first rectification circuit, a second rectification circuit, a metal plate, a lower dielectric plate and an antenna unit feed structure. Wherein the first rectifying circuit and the second rectifying circuit are both printed on the upper surface of the upper-layer dielectric plate; the first rectifying circuit is connected with the first port of the antenna unit and is used for receiving radio frequency energy in the environment; and the second rectifying circuit is connected with the second port and the third port of the antenna unit and is used for receiving radio frequency energy from the fixed radio frequency source. The antenna can be applied to radio frequency energy collection and wireless energy transmission at the same time, and has the characteristics of omnidirectional broadband and high gain. The antenna can be widely applied to the field of microwave rectification antennas.

The invention discloses a frequency selective surface unit, an array, a structure and an antenna. The frequency selective surface unit comprises a dielectric plate; the first metal patch comprises a plurality of first extension parts connected with the central part of the dielectric plate, and the plurality of first extension parts extend towards the periphery from the central part of the dielectric plate; the second metal patch comprises a plurality of second extension parts, each second extension part is connected to the tail end of one first extension part, the plurality of second extension parts extend along the edge of the dielectric plate, and the second extension parts are arranged at intervals; wherein the first metal patch and the second metal patch form an LC equivalent resonance circuit. According to the frequency selective surface unit, the array, the structure and the antenna provided by the invention, the frequency response range can be expanded, multi-band electromagnetic waves can be effectively processed, and the performance of the frequency selective surface unit in the aspects of working band, bandwidth coverage, angle stability and the like can be improved.

The invention discloses a broadband low RCS array antenna loaded with FSR. A wave absorbing layer is printed on the upper surface of a first dielectric plate, a wave transparent layer is printed on the upper, middle and lower surfaces of a second dielectric plate, a radiation layer is printed on the upper surface of a third dielectric plate, and a metal bottom plate is printed on the lower surface of the third dielectric plate; the second dielectric plate comprises two layers of dielectric plates which are stacked together; the wave absorbing layer comprises a metal square ring with four branches and lumped resistors loaded on the four sides of the metal square ring, and each branch is a metal rectangular ring which is connected to the vertex of the metal square ring and is provided with a bent metal strip; the wave-transparent layer comprises a pair of metal rings and a perforated metal plate, the pair of metal rings are placed on the upper surface and the lower surface of the second dielectric plate respectively, and the perforated metal plate is placed in the middle of the second dielectric plate; the radiation layer comprises a microstrip antenna array loaded on the upper surface of the third dielectric plate, a feed network of the microstrip antenna array, and a metal bottom plate on the lower surface of the third dielectric plate; and the radiation layer adopts coaxial line feed.

The invention discloses a transmission type one-bit phase metasurface unit for 5G millimeter waves, and belongs to the field of reconfigurable metasurfaces. The two sides of the receiving patch of the unit are respectively bridged with two PIN diodes which are arranged in the same direction; the radiation patch is respectively connected with the receiving patch and the metal ground through the metal through hole and the metal blind hole; a direct-current bias microstrip circuit and a metal ground which are separated by a semi-solidified substrate are arranged between the two dielectric plates, and the direct-current bias microstrip circuit is connected with the two rectangular patches through metal blind holes. Therefore, the center of the receiving patch is equipotential with the metal ground, and the two sides of the receiving patch are equipotential with the direct-current microstrip circuit, so that the two PIN tubes are always in opposite conduction conditions when the voltage is changed. When the state changes, the induction current directions of electromagnetic waves on the upper surface receiving patch are opposite, and transmission electromagnetic waves excited on the lower surface radiation patch through the metalized through holes generate a phase difference approximate to 180 degrees. The one-bit transmission phase regulation of 5G millimeter waves is realized, and the method has important application prospects in the fields of wireless communication, beam forming and the like.

According to the frequency polarization reconfigurable transmission array antenna unit and the transmission array antenna, an orthogonal crisscross radiation patch is used as emission layer metal of the antenna unit, and polarization conversion and phase switching of the unit in different frequency bands are realized by controlling output voltage of a circuit to change on-off states of four diodes; therefore, the characteristics of high gain, high interference resistance, high polarization matching degree, high flexibility, adjustable polarization and beam scanning of the transmission array antenna are realized. Meanwhile, as the orthogonal cross-shaped radiation patch is used as the transmitting unit, and the X-polarization rectangular receiving patch is used as the receiving unit, both the transmitting unit and the receiving unit are printed on the dielectric plate, the structure is simple and compact, the processing is convenient, and the cost is low.

A transparent antenna unit, comprising: a phase modulation layer, wherein the phase modulation layer comprises a first dielectric plate, a tunable dielectric layer and a second dielectric plate which are stacked in sequence, a first functional electrode located between the first dielectric plate and the tunable dielectric layer, and a second functional electrode located between the tunable dielectric layer and the second dielectric plate, and the orthographic projections of the first functional electrode and the second functional electrode on the first dielectric plate overlap with each other; and a transparent feed layer located on the layer of the first dielectric plate away from the first functional electrode, and connected to the first functional electrode or the second functional electrode.

The embodiment of the utility model provides a dual-polarization dielectric dipole antenna, the antenna comprises a cross-shaped radiation unit and a guide sheet, the cross-shaped radiation unit comprises a first dielectric plate and a second dielectric plate which are in cross-shaped vertical cross connection; the feed balun circuit on the second dielectric plate crosses the side edge of the top of the first dielectric plate and is connected with the radiation arm on the same side surface of the second dielectric plate; a through hole is formed in the position, at the crossed connection position of the first dielectric plate and the second dielectric plate, of the second dielectric plate and is flatly attached to the first dielectric plate, so that the feed balun circuit on the first dielectric plate is connected to the radiation arm on the same face of the first dielectric plate through the through hole along the penetrating plane. According to the embodiment of the invention, the number of holes in the cross-shaped radiation unit is reduced, so that the antenna is simple to manufacture, and the production cost and the intermodulation distortion risk are reduced. In order to further reduce radiation unit holes, the two groups of feed balun circuits can be wound and crossed from the top, or one group of radiation arms are optimized into slot coupling feed, and coupling perforation is canceled.

The invention discloses a cylindrical Luneberg lens antenna with azimuth plane and pitching plane scanning capability, which comprises a Luneberg lens, the Luneberg lens comprises a support plate and a plurality of dielectric plate units arranged on the support plate, the thickness of each dielectric plate unit is gradually changed, and the dielectric plate units are anisotropic; a first feed waveguide disposed on a side surface of the luneberg lens to perform linear polarization beam scanning; and the second feed waveguide is arranged at the bottom of the luneberg lens so as to carry out circular polarization beam scanning. According to the antenna, the scanning dimension of the cylindrical luneberg lens is expanded, beam scanning of an azimuth plane and a pitching plane is realized, and meanwhile, the advantages of simple feed and low cost of the antenna are reserved; and by using the anisotropic unit, the functions of the cylindrical luneberg lens and the polarizer are integrated into a single structure, so that the structural compactness is improved on the premise of not sacrificing the original beam scanning performance of the azimuth plane and the pitching plane. The invention relates to the technical field of antenna engineering.

The invention discloses an amplitude-phase-adjustable microstrip line high-directional coupling structure and a multichannel coupler. The amplitude-phase-adjustable microstrip line high-directional coupling structure comprises a dielectric plate, and an input port, a transmission port, a coupling port and an isolation port which are arranged on the dielectric plate, the input port is connected with the transmission port through the microstrip line, and the transmission port is used for being connected with the antenna port; the coupling port is connected with the isolation port through the two-stage coupling passband; the coupling port is used for outputting a coupling signal; the length of the coupling part of the two stages of coupling passbands can be adjusted; and a phase regulator for regulating the phase is arranged between the two stages of coupling passbands. The phase difference is formed through the distance between two stages of coupling, the amplitude and the phase are adjusted, coupling output is achieved at a coupling port, high isolation is achieved at an isolation port, and the problem that due to the fact that upper and lower media of a microstrip line high-directionality coupler are not uniform, the phase velocities of odd and even modes in the microstrip coupler are different, and the directionality of the microstrip line high-directionality coupler is poor is effectively solved. And the directivity is poor.

The present disclosure provides a phase shifter with an adjustable output mode, capable of switching the output mode of a conventional antenna in a vertical plane, includes a fixed dielectric plate provided with a fixed circuit; a moving sliding plate, the moving sliding plate is provided on the side of the fixed dielectric plate, a plurality of sliding circuits are provided on the moving sliding plate corresponding to each of the fixed circuits, the fixed circuits are capable of being coupled with at least one of the corresponding sliding circuits to form a phase-shifting circuit together, and the moving sliding plate slides with respect to the fixed dielectric plate, is capable of switching the sliding circuits coupled with the fixed circuits, and is capable of adjusting the phase of the output signal of the phase-shifting circuit; the present disclosure further provides an antenna using the phase shifter.

Provided in the present application are a radiating unit, an antenna and a base station. The radiating unit comprises two pairs of radiating arms which are orthogonally arranged in a polarized manner, and a pair of baluns for respectively feeding the two pairs of radiating arms, wherein each balun comprises a dielectric plate and a balun line; the balun line comprises a balun feeder which is arranged on a front face of the dielectric plate and a balun grounding wire which is arranged on a back face of the dielectric plate; and the balun feeder and the balun grounding wire respectively feed two radiating arms of the same polarization. The radiating unit respectively feeds the two pairs of radiating arms by means of the pair of baluns, and the balun feeder and the balun grounding wire of each balun respectively feed two radiating arms of the same polarization, such that two radiating arms of the same polarization can be fed by using one balun, so that the number of baluns is reduced, thereby reducing the size of the radiating unit, reducing the mutual coupling interference between baluns of two adjacent radiating units, and thus facilitating antenna integration.

The invention provides a novel low-cost miniaturized TRSiP packaging structure, which relates to the field of wireless communication equipment and comprises an upper ceramic dielectric plate, a lower ceramic dielectric plate, a radio frequency circuit and a metal enclosure frame, a first metal bonding pad is arranged on the upper surface of the upper-layer ceramic dielectric plate, and a second metal bonding pad is arranged on the upper surface of the lower-layer ceramic dielectric plate; the radio frequency circuit comprises a radio frequency generation assembly and a metal column. The radio frequency generation assembly is arranged on the lower ceramic dielectric plate, the radio frequency generation assembly is connected with the second metal bonding pad, the lower end of the metal column is connected with the second metal bonding pad, and the upper end of the metal column is connected with the first metal bonding pad; and the metal enclosure frame is arranged between the upper-layer ceramic dielectric plate and the lower-layer ceramic dielectric plate and surrounds the radio frequency circuit. The structure has the advantages of being low in cost, small in size, high in integration, good in air tightness and high in structural strength, and the reliability is greatly improved.

The invention discloses an antenna and an antenna preparation method. The antenna is printed on a dielectric plate and comprises a feeding point, a first grounding point, a main radiating body and a first parasitic branch knot, and the feeding point is used for receiving current transmitted by a mainboard and transmitting the current to the main radiating body; the main radiator is connected with the feeding point and is used for generating a first resonance frequency band based on current; the first parasitic branch knot is connected with the first grounding point and is used for generating coupling with the main radiator to generate a second resonance frequency band. According to the invention, the technical problems of small resonance coverage range and large size of the printed antenna in the prior art are solved.

The invention provides an ultra-wide-band wide-scanning-angle planar tight coupling array antenna. The antenna comprises a plurality of antenna units which are periodically arranged; the antenna unit comprises a coating layer, a radiation layer, a wave absorbing layer and a metal floor which are sequentially arranged from top to bottom and are not in contact; the radiation layer comprises a radiation layer dielectric plate, and a radiation patch and a coupling patch which are printed on the upper surface and the lower surface of the radiation layer dielectric plate; the radiation patch adopts an interdigital dual-polarization dipole structure; the coupling patch consists of a circular metal patch and four quasi-isosceles trapezoid metal patches which are spliced on the circumference of the circular metal patch and are uniformly distributed; the wave-absorbing layer comprises a wave-absorbing layer dielectric plate and an annular thin-film resistor printed on the upper surface of the wave-absorbing layer dielectric plate. The coupling patch can increase the coupling capacitance between the dipoles so as to offset inductive reactance introduced by the floor and suppress resonance points in a frequency band, and the thin-film resistor in the wave absorbing layer can convert energy of incident electromagnetic waves into heat energy, so that the energy is dissipated and attenuated, the resonance points in the frequency band are suppressed, and the working bandwidth is widened.

The invention provides a low-cost dual-polarization electric scanning base station antenna applied to 5G communication, and provides an effective method for the design of a low-cost electric control scanning base station antenna. According to the invention, an antenna array surface is formed based on 2-bit dual-polarized microstrip antenna units, the antenna array surface and a feed network are in plug-in connection, and the feed phase of each antenna unit is controlled through an external wave control circuit board, so that phased wave beam scanning is realized. The base station antenna has the beneficial effects that compared with a traditional fixed beam base station antenna, the coverage range of the base station antenna can be effectively expanded; according to the invention, the microstrip antenna units are separated from each other and are not printed on a whole dielectric plate, so that the array scale can be flexibly controlled according to actual requirements; the antenna unit integrates two functions of radiation and phase shift, so that an external phase shifter is omitted, and the processing, assembling and maintenance costs are greatly reduced.

The invention relates to the technical field of high-voltage commutation, and discloses a control method and system for a composite LC filter of a high-voltage converter station, and a storage medium. According to the method, on the basis of staggered solid / liquid-filled dielectric plates and series hollow inductors in a sealed oil tank, by obtaining a capacitance / inductance adjusting instruction, the filling and pumping volume and speed of insulating liquid and magnetic liquid are controlled according to the absolute value of an adjusting value, and continuous and accurate adjustment of the filtering frequency and reactive power is achieved. The method comprises multiple optimization: monitoring high fluctuation of liquid, synchronously filling, pumping and radiating, balancing efficiency and energy consumption according to an adjusting frequency adaptive circulation speed, and performing reverse linkage cooperative adjustment on a dielectric medium pump and a magnetic liquid pump; and magnetic liquid leakage and insulation abnormity are treated in stages, so that operation is guaranteed. The method solves a traditional adjustment dead zone, does not need a power electronic device, is low in cost, is small in loss, is adaptive to outdoors, and improves the electric energy quality and equipment safety of a converter station.

The invention belongs to the technical field of antennas, and particularly relates to an ultrathin full-space metasurface unit with dual-band amplitude-phase regulation and control and a multi-beam generator. In order to solve the problems that component design cost is high, unit amplitude is low, and incident wave energy cannot be efficiently regulated and controlled, the full-space metasurface unit comprises a first metal layer and a second metal layer, the first metal layer is located above the second metal layer, a dielectric plate is arranged between the first metal layer and the second metal layer, and the dielectric plate is located between the first metal layer and the second metal layer. A first C-shaped groove and a double split ring resonator are etched on the first metal layer from outside to inside in a hollowed-out manner, a second C-shaped groove and an elliptical groove are etched on the second metal layer from outside to inside in a hollowed-out manner, and the opening directions of the first C-shaped groove and the second C-shaped groove are perpendicular to each other. And the multi-beam generator is designed based on the total space metasurface unit.

The utility model provides a gas distribution device of a flat plate type plasma system applied to peald equipment, and relates to the technical field of plasma equipment. Comprising a vacuum cavity, a medium flat plate, an atmosphere side process pipeline and a vacuum side process pipeline, and the vacuum side process pipeline comprises a plurality of process gas pipe branches parallel to the medium flat plate so that ionized gas can be evenly distributed in the vacuum cavity; a plurality of gas holes with openings facing the medium window are uniformly distributed in each process gas pipe branch along the length direction of the process gas pipe branch, so that gas directly flows to the medium window after coming out of the process gas pipe branch, and continuously flows to the vacuum cavity after being rebounded by the medium window, and a gas rebounding area is just positioned in a high ionization area of plasma; and the ionization rate of the process gas is further improved. According to the scheme, the plasma distribution uniformity of the flat plate type plasma system can be improved.

The invention provides a single-feed broadband circularly polarized patch antenna for navigation. The single-feed broadband circularly polarized patch antenna comprises a first dielectric plate, a second dielectric plate, a third dielectric plate, a metal shielding box and a coaxial cable, an antenna radiator is printed on the first dielectric plate, a coplanar waveguide structure is printed on the second dielectric plate, and a feed structure is printed on the third dielectric plate; the coaxial cable feeds power to the coplanar waveguide structure on the second dielectric plate through the feed structure on the third dielectric plate; and the coplanar waveguide structure on the second dielectric plate feeds the antenna radiator on the first dielectric plate in a coupling manner. The coplanar waveguide structure and the patch antenna are combined, the axial ratio bandwidth of the single-feed circularly polarized antenna is successfully improved through the coplanar waveguide coupling feed technology, the maximum working bandwidth of the single-feed circularly polarized antenna is improved by more than one time, and the problem that the single-feed circularly polarized antenna is narrow in bandwidth and difficult to apply to satellite navigation is solved. And the method has extremely high applicability and flexibility in multi-system and multi-band satellite navigation application.

The utility model discloses an air dielectric RNRD antenna structure. The air dielectric RNRD antenna structure comprises a ground reflecting plate, a dielectric plate, a radiation sheet assembly, a grounding coupling assembly and a feed assembly. The dielectric plate is arranged on one side of the ground reflecting plate, and the dielectric plate and the ground reflecting plate are arranged at an interval to form a gap for air medium circulation; the radiation sheet assembly comprises a first radiation sheet and a second radiation sheet, the first radiation sheet and the second radiation sheet are attached to the side, back to the ground reflection plate, of the dielectric plate, the first radiation sheet is provided with a hollow area, the second radiation sheet is located in the hollow area, the grounding coupling assembly comprises a grounding coupling branch knot and an induction sheet, and the feed assembly comprises a coupling feed point. And a direct feeding point and a direct feeding needle. According to the technical scheme of the utility model, the grounding coupling assembly, the feed assembly, the first radiation sheet and the second radiation sheet generate direct feed or coupled feed, so that the section of the RNRD antenna structure is lower, the size and the volume are lighter, and the manufacturing cost of the antenna is reduced.