599 results about "Dielectric plate" patented technology

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 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 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.

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 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 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.

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 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 discloses a 2-bit multi-polarization reconfigurable electric control metasurface antenna which comprises a linear polarization feed source horn and a reflection type metasurface. The reflective metasurface comprises a plurality of metasurface units arranged periodically, and each metasurface unit comprises a first metal layer, a first dielectric plate, a second metal layer, a prepreg layer, a third metal layer, a second dielectric plate and a fourth metal layer which are sequentially and coaxially stacked from top to bottom. And two pairs of p-i-n diodes are integrated on each metasurface unit and are used for regulating and controlling linearly polarized waves from the feed source. According to the metasurface antenna, the radiation capacity of dual linear polarization and dual circular polarization is achieved through the single linear polarization feed source and the single reflection type metasurface at the same time, the beam scanning capacity of + / -60 degrees is achieved, and the aperture efficiency is high. In addition, a direct-current control circuit for controlling a p-i-n diode switch is designed on the back surface of the reflective metasurface, so that the integration level of the metasurface system is greatly improved. The metasurface antenna has the advantages of being simple in structure, large in polarization number, low in structural complexity and high in integration degree.

The present application relates to the technical field of communications, and discloses a base station antenna unit, a base station antenna array, and a base station. The base station antenna unit comprises a dielectric plate, a metal ground plate, a first dielectric resonator, a second dielectric resonator, a dielectric coupling path, and a feeding structure; the metal ground plate and the feeding structure are arranged on two sides of the dielectric plate, respectively, and a cross-shaped slot is formed on the metal ground plate; the first dielectric resonator and the second dielectric resonator are of a symmetrical structure, and the first dielectric resonator and the second dielectric resonator are arranged on the dielectric plate; the dielectric coupling path is arranged on the dielectric plate, located between the first dielectric resonator and the second dielectric resonator, coupled to the first dielectric resonator and the second dielectric resonator, and located above the cross-shaped slot; and the feeding structure has two feeding ports, feeding input by means of different feeding ports excites the cross-shaped slot to generate an orthogonal electric field, and electromagnetic waves of the orthogonal electric field reach the first dielectric resonator and the second dielectric resonator by means of the dielectric coupling path.

The embodiment of the invention relates to an infrared light conduction structure, an infrared control circuit and an infrared control method, a second infrared module is used for receiving an infrared signal and providing a compensation infrared signal for a first infrared module so as to counteract the influence of ambient light in infrared gesture recognition, so that the infrared gesture recognition is more accurate; and the first infrared module and the second infrared module are both arranged on the dielectric plate, and the dielectric plate can realize PCB multiplexing by redesigning a PCB on which the first infrared module is originally mounted, so that the problems of high cost and unstable reliability caused by adding additional optical devices are avoided. Meanwhile, a third infrared module can be integrated on the dielectric plate, so that the conduction efficiency of infrared receiving signals is improved, the integration degree of the infrared light conduction structure is higher, layout and production of circuit devices are facilitated, and the production cost is reduced.

This plasma processing device includes: a processing container; a placement table on which a substrate is placed inside the processing container; and an upper electrode provided at a position separated from the placement table. The upper electrode includes: a dielectric plate; and an electrode plate which is layered on the dielectric plate and to which high-frequency power is supplied. A cooling mechanism for cooling the electrode plate is connected to the electrode plate. A heat-transfer gas supply space is formed between the electrode plate and the dielectric plate. Furthermore, the plasma processing device includes: a heat transfer adjustment unit that adjusts the thermal conductivity of a heat-transfer gas supplied to the heat transfer gas supply space; and a control unit that controls the heat transfer adjustment unit.

The invention provides a broadband circularly-polarized metasurface antenna which comprises a first dielectric plate, a second dielectric plate, a metasurface radiator, a sequential feed network, a metal reflecting plate, a coaxial cable, a feed probe and a metal short-circuit needle. The first dielectric plate is arranged above the second dielectric plate in parallel; the metal reflecting plate is printed on the lower surface of the second dielectric plate; the metasurface radiator comprises a square patch printed in the middle of the lower surface of the first dielectric plate, and an inner ring metasurface array, an outer ring metasurface array and a quarter-wavelength branch printed on the upper surface of the first dielectric plate. The broadband circularly polarized metasurface antenna provided by the invention has the working bandwidth of 37.74%, the gain of 6.36-9.28 dBi and good directional radiation performance, and has the advantages of wide broadband, high gain and small size.

The invention discloses a Ka-band broadband filtering antenna, which comprises a probe, a ground paving layer, and a first horizontal dielectric plate, a first radiation patch, a second horizontal dielectric plate and a second radiation patch which are arranged on the ground paving layer, and is characterized in that the first radiation patch is provided with a c-shaped groove, the c-shaped groove is internally provided with a circular groove, and the circular groove is internally provided with a pair of branches; one ends of the two branches are combined to form a combined end connected to the first radiation patch, and the other ends of the two branches are parallel and have a gap to form a parallel opening end; and the center of the second radiation patch is close to the combined end of the two branches on the first radiation patch and far away from the parallel opening ends of the two branches on the first radiation patch. According to the invention, through collaborative design of slotting and branch knot loading, a filtering structure is innovatively constructed. The core innovation lies in the collaborative design of the two filtering structures and the spread spectrum structure, and the filtering frequency domain and the passband width are remarkably improved. The method can be widely applied to the fields of base stations, national defense and military industry and the like.

The invention relates to an antenna array and an antenna device, the antenna array comprises a plurality of array elements and a metasurface, the plurality of array elements are arranged at intervals along a first direction of the antenna array, and the metasurface and the array elements are arranged at intervals along a thickness direction of the antenna array; the metasurface comprises a plurality of metasurface units, the metasurface units are arranged in an array, each metasurface unit comprises a metasurface dielectric plate and a patch, the patches are arranged on the metasurface dielectric plates and used for adjusting the phase of electromagnetic waves radiated by the array elements, and the sizes of the patches of at least part of columns of metasurface units are different in the first direction. Therefore, at least part of the metasurface has a specific phase gradient, single-beam deflection can be carried out on electromagnetic waves radiated by the array element located below the metasurface with the phase gradient, and the phase of the electromagnetic waves radiated by the array element is adjusted, so that the beam directions of the electromagnetic waves radiated by the array element during feeding tend to be consistent, and the radiation efficiency of the array element is improved. And the phase consistency of the antenna array is improved.

The invention provides an antenna structure and communication equipment. The antenna structure comprises a first dielectric plate and a radiation patch arranged on the first dielectric plate, the radiation patch is provided with a first edge, a second edge, a third edge, a fourth edge, a fifth edge and a sixth edge, the first edge and the fourth edge are oppositely arranged, the fifth edge and the second edge are oppositely arranged, the first edge is connected with the fifth edge through the sixth edge, and the second edge is connected with the fifth edge through the third edge. The second edge is connected with the fourth edge through the third edge, obtuse angles are formed between the third edge and the second edge and between the third edge and the fourth edge, and obtuse angles are formed between the sixth edge and the first edge and between the sixth edge and the fifth edge; the radiation patch is provided with a slot penetrating through the radiation patch, and the slot is used for adjusting the resonance frequency point position and the resonance intensity. And / or the antenna structure further comprises a resonant ring which is arranged on the first dielectric plate and surrounds the radiation patch; the resonant ring is used for adjusting the number of resonant points.

The utility model provides an ultra-wide-band high-performance array antenna, which comprises a plurality of ultra-wide-band oscillator units arranged on a reflecting substrate in an array form, the ultra-wideband oscillator unit comprises a plurality of radiation parts arranged on the dielectric plate at intervals, and the radiation arm of any radiation part and the radiation arm of the adjacent radiation part are collinear to form a dipole; in one radiation piece, any two adjacent radiation arms are perpendicular to each other to form a dual-polarized oscillator; the ultra-wideband oscillator unit further comprises a parasitic branch knot. The parasitic branches are arranged between every two radiation pieces, and the parasitic branches are arranged on the dielectric plate in the horizontal direction and the vertical direction; the radiation part and the parasitic branch knot are coupled and connected to form a frequency expanding structure. According to the utility model, the S parameter of the oscillator unit is optimized by arranging the coupling frequency-broadening structure and the parasitic branch knot, electromagnetic waves are guided through the cooperation of the reflecting strip, the isolating strip and the director, the interference of high frequency to low frequency is reduced, the standing-wave ratio of the antenna is further reduced, and the directivity of the antenna is improved.

The invention relates to the technical field of ultra-wideband antennas, and discloses an ultra-wideband wide-angle scanning tight coupling antenna and array, and the antenna comprises an impedance matching layer, an antenna radiation layer, an antenna supporting layer and a metal floor which are stacked from top to bottom. The impedance matching layer comprises three layers of eccentric cross-shaped dielectric plates, and the first eccentric cross-shaped dielectric plate at the top layer and the second eccentric cross-shaped dielectric plate at the middle layer are provided with circular grooves at the intersection center position of the two groups of orthogonal dipoles; the antenna radiation layer is provided with two groups of orthogonally arranged unequal-width pentagonal dipoles; the antenna supporting layer is provided with two groups of feed short circuit columns and two groups of metal rib belts; and the metal floor is provided with a two-section stepped feed through hole. According to the invention, the scanning range is expanded under the condition of ensuring good matching.

The invention discloses a co-packaged optical switching module and an optical engine network. The co-packaged optical switching module comprises a photonic integrated chip and an optical switching bare core, and the photonic integrated chip is stacked above the optical switching bare core and is electrically connected with the optical switching 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 optical switching bare core; the optical switching 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 invention, which relates to the technical field of modern communication, discloses a metasurface-based high-gain low-profile dual-circularly polarized antenna comprising a first dielectric plate, a second dielectric plate arranged below the first dielectric plate, and a metasurface structure arranged above the first dielectric plate. Three rows and three columns of periodically arranged metasurface structures are arranged above the first dielectric plate, a multi-level cooperative working mechanism is constructed by combining 45-degree symmetrical composite gaps etched in a layer indirect floor and a microstrip feeder line which is orthogonally arranged on the lower layer, and the metasurface array realizes high-gain radiation by regulating and controlling the phase of electromagnetic waves. The composite slot structure efficiently converts microstrip line energy into an orthogonal degenerate mode through non-contact coupling, circular polarization purity is guaranteed, the axial ratio bandwidth is expanded to 24.2%, an orthogonal microstrip feeder line forms a 90-degree phase difference through accurately controlled size, high isolation and stable standing-wave ratio of double ports are guaranteed, and the antenna has a wide application prospect. And finally, dual-circular-polarization independent radiation is realized in a 5mm low-profile structure.

This application provides a multi-band shared-aperture antenna. The multi-band shared-aperture antenna includes a first antenna array, a second antenna array, and a reflection panel, where the first antenna array includes four first dielectric plates perpendicular, two adjacent first dielectric plates are perpendicular to each other, the first antenna array includes four hollowed butterfly dipole units, the dipole unit includes two radiation arms, the two radiation arms are respectively printed on two adjacent first dielectric plates, the radiation arm includes a first part and a second part, a first feeding stub is disposed on the first dielectric plate, the second part has a specified width in a direction perpendicular to the reflection panel, the second antenna array includes a plurality of second dielectric plates, four ring-shaped coils are disposed on any one of the second dielectric plates, and the ring-shaped coil is connected to a second feeding stub.

The invention discloses a multi-layer resistive film frequency selective surface composite wave-absorbing device with high bearing and wave-absorbing integrated functional characteristics. The composite wave absorbing device sequentially comprises a mechanical bearing layer composed of a wave-transparent dielectric plate subjected to impedance modification and a dielectric isolation layer from top to bottom. The wave-absorbing functional layer is formed by arranging three layers of resistive film frequency selective surfaces, three layers of dielectric isolation layers and six layers of wave-transparent dielectric plates at intervals; and the total reflection bottom plate is formed by a carbon fiber plate or a metal plate. According to the invention, a layer of resistive film frequency selective surface is embedded in the wave-transparent dielectric plate, so that the wave-absorbing bandwidth can be effectively expanded while the high-bearing mechanical property is ensured; a layer of wave-transparent dielectric plate is laid on the upper portion and the lower portion of the frequency selective surface of each resistive film in the wave-absorbing functional layer so as to further reinforce the mechanical bearing characteristic of the composite wave-absorbing device.

The invention discloses a folding transmission array antenna, a communication module and electronic equipment, and belongs to the technical field of antennae, the antenna comprises a transmission surface, a reflection polarization conversion surface, a feed source and a plurality of support pillars, the transmission surface is provided with a plurality of transmission array units, the reflection polarization conversion surface is provided with a plurality of reflection polarization conversion metasurface units, and the support pillars are arranged on the transmission array units. The reflective polarization conversion metasurface unit is made of a near-zero refractive index metamaterial; the transmission array unit is composed of a first dielectric plate, a second dielectric plate, a first metal layer, a second metal layer and a third metal layer; the reflection polarization conversion metasurface unit comprises a third dielectric plate and a metal plate, and a fourth metal layer and a fifth metal layer are arranged on the two faces of the third dielectric plate respectively; the communication module adopts the antenna; the electronic equipment adopts the antenna. The antenna profile is further compressed under the condition that the geometric position of the feed source is not changed, meanwhile, feed source blocking is avoided, high gain can be kept in a specific frequency band, and the dual requirements of a modern communication system for antenna miniaturization and high performance are met.

The invention provides a broadband millimeter wave circularly polarized antenna based on SIW feed. The broadband millimeter wave circularly polarized antenna comprises a first dielectric plate and a second dielectric plate which are aligned and superposed from top to bottom, a second metal layer is arranged on the upper surface of the first dielectric plate, a first metal layer is arranged on the lower surface of the first dielectric plate, a feed coupling gap is etched in the first metal layer, and a third metalized through hole group is arranged in the first dielectric plate; a metal ground is arranged on the lower surface of the second dielectric plate, a first metalized through hole group and a second metalized through hole group are arranged in the second dielectric plate, and a plurality of metalized through holes in the first metalized through hole group are sequentially connected to form a substrate integrated waveguide transmission structure with a closed tail end, namely an SIW feed structure. The working bandwidth of the circularly polarized antenna in the millimeter wave frequency band is greatly expanded, low-axial-ratio and high-gain left-hand circularly polarized waves can be realized in the working frequency band, the structural design is simple and reasonable, the profile is low, and the circularly polarized antenna has important practical significance for a mobile communication system.

The utility model provides a water film type dielectric barrier discharge water treatment device which comprises a dielectric plate, the dielectric plate is obliquely arranged, the dielectric plate is provided with an upstream face, and the upstream face comprises a plurality of plane areas and concave areas arranged between every two adjacent plane areas; the first electrode is grounded, and the first electrode is arranged opposite to the upstream face; and the second electrode is electrically connected with the power supply, and the second electrode is arranged on the side, away from the upstream face, of the dielectric plate. A discharge area is formed between the first electrode and the second electrode, active particles can be generated, and wastewater is treated through the active particles. A plurality of concave regions are arranged on the smooth dielectric plate, the concave regions can increase the surface area of the dielectric plate relative to a plane region, so that the retention time of wastewater on the dielectric plate is prolonged, and the relative specific surface area of the dielectric plate with the concave regions is far larger than that of a smooth flat plate, so that the contact area of the wastewater and active particles in a discharge region can be enlarged; the pollutant degradation efficiency is greatly improved.

The invention relates to a radiation unit, a base station antenna and a base station. The radiation unit comprises a radiation dielectric plate and two pairs of radiation arms which are arranged on the surface of the radiation dielectric plate and are orthogonally polarized. The balun structure comprises a first balun and a second balun, the first balun comprises a first feed conductor and a first grounding conductor which are arranged in the second direction and electrically connected, and the second balun comprises a second feed conductor and a second grounding conductor which are arranged in the second direction and electrically connected; the switching structure comprises a first connecting line and a switching piece which are arranged on the first surface and a second connecting line arranged on the second surface, and two ends of the first connecting line are respectively connected with the first grounding conductor and the second radiation arm; the second grounding conductor is welded with the switching sheet; one end of the second connecting line is connected with the switching sheet through a metalized via hole, and the other end is connected with the fourth radiation arm. When the balun structure is connected with the radiation arm, the switching operation is simplified.