33results about How to "Low profile" patented technology

This invention belongs to the field of microwave communication technology, specifically relating to a PIFA antenna for 5G dual-band coverage. The invention includes a rectangular metal patch on a top surface, a substrate, and a metal ground plane stacked from top to bottom. A row of grounding vias is disposed through the substrate, and this array of grounding vias is located at the lower end of one side of the rectangular metal patch on the top surface. A coaxial feeding structure is disposed below the rectangular metal patch on the top surface. The antenna excites its fundamental mode TM through the coaxial feeding structure. 0.5,0 Mode and three higher-order modes TM 0.5,1 Pattern, TM 0.5,2 Pattern, and TM 0.5,3 The pattern includes a rectangular metal patch on the upper surface with a first slot along its vertical center line; the first slot has an opening on the side furthest from the grounding via for adjusting the TM. 0.5,1 Pattern and TM 0.5,3 The resonant frequency of the mode; a pair of second slits are orthogonally arranged on both sides of the first slit; the second slits are used to modulate the TM. 0.5,0 Pattern and TM 0.5,2 The resonant frequency of the mode. The antenna design proposed in this invention has advantages such as simple structure, relatively wide dual-band coverage, small size, and low profile.

The application discloses a medium strip MIMO filtering antenna with self-decoupling characteristics, and a 1*2 antenna unit array structure comprises two high dielectric constant medium strip resonators of a top layer, an upper layer low dielectric constant substrate layer, two metal strip structures of a middle layer, a lower layer low dielectric constant substrate layer, a metal ground layer and a bottom layer feeding structure. The two high dielectric constant medium strip resonators are arranged above the upper layer low dielectric constant substrate layer and arranged in an E plane; the two metal strip structures of the middle layer are respectively opposite to the two high dielectric constant medium strip resonators. A half-wave length mode of a signal is fed into the middle layer metal strip to excite a TM 10 mode of the top layer medium strip through coupling, so as to form a radiation band with two resonance points, and the two medium strip resonators are respectively arranged in a weak field area of each other, so that the designed antenna has filtering and decoupling functions at the same time, and a low profile and high efficiency effect are achieved.

This invention discloses a broadband circularly polarized integrated feed transmission array antenna covering the entire Ka-band, comprising an array surface and an integrated feed. The phase center of the integrated feed coincides with the focal point of the array surface, illuminating the array surface perpendicularly and forming a 45-degree angle with the array surface in the horizontal direction. The array surface comprises multiple array elements of different sizes arranged linearly. Each array element includes two orthogonally arranged first and second dielectric substrates, which have the same height but different thicknesses. The integrated feed comprises a stacked first and second PCB board. A substrate integrated waveguide is disposed on the first PCB board with coupling slots, and a substrate integrated waveguide cavity and annular metal patches surrounding the substrate integrated waveguide cavity are disposed on the second PCB board. This invention achieves a wide axial ratio bandwidth and gain bandwidth, and has the advantages of low profile, light weight, easy fabrication, and low cost.

The application discloses a compact planar Van Atta array loaded with cross structure, comprising 2N 2 antenna pairs, each of which is composed of two antenna units as receiving unit and transmitting unit respectively, wherein at least two antenna pairs are connected by a cross structure, each cross structure connects two antenna pairs, the cross structure is formed by cascading two branch line couplers, has the characteristic that signals are transmitted only along diagonal ports, and the connection line length of the cross structure and the antenna units is adjusted, so that the two antenna pairs connected by the cross structure have equal phase. The application connects the antenna pairs by the cross structure, so that the structure of the planar Van Atta array is more compact and is easy to integrate; the direction backtracking function can be realized by only using a single-layer structure, the antenna profile is lower, the antenna does not need to be perforated, the cost is lower, and the application can be applied to a two-dimensional array, so that the application prospect is wider.

The application discloses a millimeter wave flat plate slot array antenna with a filtering function, and relates to the technical field of radio frequency communication. The copper-based micro coaxial line-quasi-planar waveguide transition structure is connected with the staggered vertical layout cross-coupled millimeter wave filter, and is integrated with the quasi-planar waveguide feed power division network to realize a three-dimensional quasi-planar low-loss integrated feed circuit, and the feed circuit excites the high-mode flat plate slot antenna array through a coupling slot. The application utilizes the multi-layer metal plane and vertical design capability of electrochemical additive technology, breaks through the key problems of low-process-complexity low-loss interconnection integrated transition interface, low-loss miniaturized filtering structure and array antenna remaining limited special-shaped physical space integrated, and meets the actual application requirements of miniaturization and integration of the millimeter wave radio frequency communication system.

The invention relates to a low-scattering array based on integration of a absorption and transmission integrated metasurface and a Vivaldi antenna, the low-scattering array is composed of N * N units, and each unit comprises a loss layer, an antenna radiator, an air layer between the antenna radiator and the loss layer, and a floor. The loss layer takes a dielectric plate as a substrate, resonators are printed on the upper surface and the lower surface of the dielectric plate, and each resonator is formed by sequentially rotating 90 degrees, 180 degrees and 270 degrees along the anticlockwise or clockwise direction by taking the center of the square dielectric plate as a rotating center and positioning. The antenna radiator takes a dielectric plate as a substrate, a first surface of the dielectric plate is printed with a metal patch of a radiation structure, a second surface of the dielectric plate is printed with a feed network composed of an impedance conversion microstrip line and a fan-shaped microstrip line which are connected in sequence, and the floor is a metal plate with a rectangular gap. According to the metasurface and antenna integrated structure, the bandwidth of the metasurface and antenna integrated structure is greatly widened while out-of-band scattering reduction is achieved, the low-profile characteristic is shown, and the actual application requirement of a broadband antenna system is met.

The invention relates to the field of antennas, and particularly discloses a dual-polarized antenna, which comprises a slot antenna layer for radiating a first polarized wave and a microstrip antenna layer for radiating a second polarized wave, wherein the slot antenna layer comprises a waveguide structure, the waveguide structure comprises a plurality of radiation units arranged along a first direction, and each radiation unit comprises a plurality of radiation slots extending along a second direction; the micro-strip antenna layer comprises a plurality of micro-strip oscillator units arranged along a first direction, and each micro-strip oscillator unit comprises a plurality of micro-strip oscillators arranged along a second direction; the microstrip antenna layer is arranged on the slot antenna layer, at least one microstrip array unit is arranged between the radiation units, and projections of the microstrip arrays and the radiation slots on the waveguide structure are not overlapped; the antenna is simple in structure, has the characteristics of low profile, miniaturization and light weight, can obtain the electromagnetic scattering characteristics of a target in different polarization directions, and is suitable for a high-frequency dual-polarized antenna.

A bath pedal convenient to install comprises a pedal body, and a containing area capable of containing a lifting rope is arranged at the bottom of the pedal body. A hollow pipe is installed at the bottom of the pedal body, and the interior of the hollow pipe is hollow to form a containing area. And the hollow pipe is fixed at the bottom of the pedal body through an adhesive. The bath pedal has the advantages that the containing area capable of containing the lifting rope is innovatively arranged at the bottom of the bath pedal body, and the core advantage of the structure is that an acting point is provided for the installation process. During installation, installation personnel can enable a lifting rope to penetrate through the hollow flat pipes arranged at the bottom of the pedal. Afterwards, the two persons can respectively pull the two ends of one lifting rope, and the whole bath pedal can be horizontally lifted easily and stably like a lifting handle. The problem that in the prior art, due to the fact that pedals are heavy and lack suitable grabbing points, force is difficult to apply especially in narrow spaces such as three faces leaning against the wall is thoroughly solved.

The application relates to a waveguide coplanar slow wave line, belonging to the technical field of frequency scanning antennas, and solves the problem of large space occupation caused by independent design of the slow wave line and the radiation unit of the frequency scanning antenna in the prior art. The waveguide coplanar slow wave line is integrated with a rectangular waveguide; the slow wave line has multiple omega-shaped bends. One radiation unit is arranged on the slow wave line every interval of the omega-shaped bends. The application realizes the longest length of the slow wave line under the premise of fixed spacing of the radiation units, and realizes low profile design by arranging the slow wave line and the waveguide to be coplanar.

The utility model discloses a low profile electromechanical rear derailleur, including base member, movable component, connecting rod mechanism, chain guide, motor module and power supply, the motor module sets up on base member for driving movable component moves relative to base member, the power supply sets up on movable component for giving motor module power supply, the base member is equipped with the installation position, chain guide includes chain guide wheel and tension pulley, the chain guide wheel has the wheel plane, and the installation position has the reference point, and the reference point is the reference point closest to the radial center plane of bicycle rear wheel, when the chain is located the minimum freewheel piece, the distance between reference point and wheel plane is greater than or equal to 0. The rear derailleur outwardly stretches the distance smaller, makes the rear derailleur whole almost hide in the inside of frame, can improve the safety of riding, when falling the car, effectively avoided the damage of rear derailleur, also solved the problem that the wiring is difficult, and the dismounting maintenance is difficult.

The utility model provides a kind of high-density antenna isolation degree enhancement antenna array, belong to antenna technical field, its antenna body is rectangular, and the array unit of rotational symmetry is equipped in top surface four corners, interval is 0.3λ.Antenna body adopts microstrip+dielectric filling to realize low profile, and array unit contains metal radiator outer cover high dielectric constant support insulator to reduce size.Antenna body top surface center cross metal isolation component is made of four vertically arranged concave section isolation plate, and it is accurately placed between adjacent units.The structure effectively blocks electromagnetic coupling path, and the actual measurement isolation degree is improved by more than 15dB compared with traditional scheme, and the surface current dissipation is guided by quasi-periodic boundary condition, without significantly increasing loss.Rotational symmetry layout naturally tolerates process error, ensures phase consistency, and the yield is better than asymmetric design.

This invention provides a dual-band filtered planar lens antenna for satellite communication, comprising a lens array composed of multiple lens units. Each lens unit includes a first substrate, a second substrate, a third substrate, and a fourth substrate arranged sequentially from top to bottom. A radiating patch for the dual-band filtered antenna is disposed on the upper surface of the first substrate. A broadband magnetoelectric dipole is disposed on the fourth substrate. A serpentine stripline is disposed on the upper surface of the third substrate. One end of the serpentine stripline is connected to the metallized via of the feed end of the radiating patch of the dual-band filtered antenna via a first vertical feed probe, and the other end of the serpentine stripline is connected to the feed arm of the broadband magnetoelectric dipole via a second vertical feed probe. The advantages of this invention are: it achieves dual-band filtering and beamforming functions through the radiating patch of the dual-band filtered antenna, generates radiation nulls on both sides of the two passbands, and maintains a high roll-off coefficient using the serpentine stripline structure, thus overcoming the shortcomings of traditional designs.

The invention discloses a dual-frequency decoupling patch antenna loaded with a short-circuit stub. The dual-frequency decoupling patch antenna comprises a top metal layer, a dielectric substrate, a bottom metal layer and a coaxial probe feed structure, the top metal layer is provided with at least two rectangular metal patch units arranged along the same direction, each patch unit is provided with a double-frequency slot, short-circuit stubs consisting of metal strips and metalized through holes are symmetrically loaded on two sides, and the metalized through holes penetrate through the dielectric substrate and are electrically connected with the bottom metal layer. After the signal is injected, the patch unit excites the quasi TM10 mode radiation at the double frequency points, and the short-circuit stub line enables the feed port of the coupling patch to form a weak field area, thereby achieving the dual-band mutual coupling suppression and directional diagram decoupling. The antenna is simple in structure and low in profile, a linear array can be formed, coupling of adjacent and non-adjacent units is effectively reduced, and the radiation performance of the antenna is improved.

The invention discloses a low-profile multi-frequency vertical polarization antenna integrated structure which comprises a U-band antenna, an L-band antenna, a C-band antenna and feed of the three antennas, a U-band antenna assembly and an L-band antenna assembly are microstrip antennas loaded with short circuit columns and are composed of media and radiation patches, and the U-band antenna assembly and the L-band antenna assembly are microstrip antennas loaded with short circuit columns. The C-band antenna assembly is a short-circuit loaded metal monopole antenna and is composed of a stepped metal structure and a dielectric layer, the three antenna assemblies all adopt short-circuit loading, the height of the antenna is reduced, the U-band antenna, the L-band antenna and the C-band antenna are sequentially overlapped from low to high, the antennas are isolated by loading media, longitudinal integration of the three antennas is achieved, and the antenna structure is compact. Wherein the U-band antenna assembly directly adopts coaxial line feeding at the center of the bottom, the L-band antenna assembly and the C-band antenna assembly are respectively connected with coaxial lines at the other two sides of the bottom through microstrip lines for feeding, and the coaxial lines penetrate through short circuit columns of the antenna, so that the influence on the structure and the performance of the antenna is reduced; the microstrip line is arranged in a dielectric layer between the antennas, and short circuit columns are loaded around the microstrip line, so that energy leakage is reduced. Integration of multi-band antennas is achieved, an effective feeding method is provided for integration of multiple antennas, and meanwhile the antenna has the advantages of being low in profile, easy to achieve and convenient to machine.

The invention discloses a phased array radar system, and relates to the technical field of weather radars. The radar system comprises a radar body, a servo system and an antenna system, the antenna system comprises at least one antenna unit, and each antenna unit comprises a bottom copper sheet, a dielectric substrate and a top copper sheet which are stacked from bottom to top; a plurality of grooves are formed in the top-layer copper sheet and comprise a central groove located in the central area and side grooves symmetrically formed in the two sides of the central groove, the number of the side grooves is even, the side grooves are arranged in pairs, and each pair of side grooves are symmetrical about the central axis of the top-layer copper sheet. Through the synergistic effect of the central groove and the symmetrical side grooves, the current distribution on the surface of the top copper sheet is changed, the antenna gain is effectively improved, the side lobe level of an E surface is inhibited, and the beam width of an H surface is narrowed, so that the requirement on the power of a TR assembly is reduced, the system energy consumption is reduced, and the detection precision is improved.

This invention discloses a low-profile, dual-circularly polarized Ka-band phased array antenna, primarily addressing the problems of high profile, complex structure, and inability to polarize multiplex traditional circularly polarized phased array antennas. The antenna feeding structure and metal patch structure of this invention are symmetrical. The left and right circularly polarized feed ports are directly connected to the radiating patch, respectively exciting the patch to generate left-hand and right-hand circular polarization, achieving control from single to dual circular polarization. The direct connection of the left and right circularly polarized feed ports to the radiating patch excites the patch to generate left-hand and right-hand circular polarization without introducing any additional structures, simplifying the antenna design process and enabling polarization multiplexing of the circularly polarized antenna. The antenna of this invention consists of two dielectric substrates, eliminating the need for a complex intermediate feed network, resulting in an antenna with advantages of simple structure and low profile.

The invention relates to the technical field of aviation aircraft design, and discloses a variable camber wing based on a bistable composite material structure driving multi-section rotation, which comprises a wing leading edge structure, a multi-section rotation rigid skin, an internal truss structure connected with the multi-section rotation rigid skin, a bistable composite material driving structure and a transmission mechanism, the bistable composite material driving structure is arranged between the rigid skin hinge and the transmission mechanism; and the transmission mechanism is arranged between the truss structure in the rigid skin and the sliding chute of the wing leading edge structure. The control precision and reliability are improved through relative change of the three rigid wings, and the problems that in the prior art, the structure is complex, the weight is large, the actuation efficiency is low, and the bearing capacity is low are solved.

The application discloses a low-profile heavy-load 2R1T parallel platform and belongs to the technical field of parallel robots. The low-profile heavy-load 2R1T parallel platform comprises a static platform, a dynamic platform, three driving branch chains and three constraint branch chains connecting the static platform and the dynamic platform; the lower ends of the three driving branch chains are connected to three connecting points of the static platform through Hooke joints, and the three connecting points form an equilateral triangle; in an initial state, the axes of the three driving branch chains are parallel to each other and are perpendicular to the static platform and the dynamic platform respectively; the three constraint branch chains are distributed in space and are perpendicular to each other and are parallel to three coordinate axes of a Cartesian coordinate system respectively. The three driving branch chains are all in the UPS structure, and the three constraint branch chains are in the SS structure, the variable PUU structure and the SS structure respectively. The low-profile heavy-load 2R1T parallel platform is a parallel mechanism, has the advantages of large bearing capacity, low profile, low gravity center, difficulty in toppling and structural stability, and the mechanism can obtain an analytical solution through establishment of a kinematic equation.

This invention discloses a bandwidth-reconfigurable dual-polarized dielectric patch antenna for full-duplex communication. The antenna consists of a rectangular dielectric patch with a pair of grooves etched along its edges and two substrate layers. In the X-polarization direction, a single port is used to excite the fundamental mode TM. 10 mode and higher mode TE 12 This mode is used for broadband transmitter operation. For the Y-polarization direction, a differential feed structure is used to excite a degenerate TM. 01 Mode and Inversion™ 02 This mode is used for broadband receiver operation. A metal ground plane is placed between two substrates, and two sets of slots are etched on it for aperture coupling between the dielectric patch resonator and the metal microstrip line located at the bottom of the lower substrate. A variable capacitor is placed in the coupling slot in the Y-polarization direction to tune the operating bandwidth of the dielectric patch antenna in the Y-polarization direction. This gives the antenna advantages such as bandwidth reconfigurability, high isolation, low profile, and simple structure, making it promising for applications in full-duplex systems.

The application discloses a kind of modularizable integrated millimeter wave plane active phased array architecture, which is highly scalable by cascading N×M standard sub-modules in master version, and the system-level feasibility verification is completed in 2×2 sub-module array configuration;Each subarray module is arranged adjacently, and the relative sequential rotation topology of 0°, 90°, 180° or 270° is introduced;The array of the verification system subarray module adopts non-uniform spacing distribution design, and the system radio frequency link is constructed by cascading multi-channel beamforming chip and wilkinson power divider;The signal is amplified and synthesized to the total interface, and the system realizes agile scanning of beam by FPGA driving, and is packaged in active heat dissipation metal shell.The application has the characteristics of low profile and easy integration, and by irregular distribution of array elements and module rotation combination, high gain is maintained in wide-angle scanning domain, and the terminal's ability to capture and stable tracking of high-speed moving satellite is significantly enhanced.

The invention belongs to the technical field of electromagnetic wave regulation and control, and particularly discloses a transmission and reflection integrated beam regulation and control unit and a metasurface array system.The beam regulation and control unit is of a seven-layer structure including four metal layers and three medium / bonding layers from top to bottom, transmission and reflection mode switching is achieved through PIN diode on-off control, and the metasurface array system is formed. 180-degree phase difference can be generated in the two modes, interlayer signal transmission is achieved through plated-through holes, the electromagnetic performance is improved through inductors, and direct-current and alternating-current signals are isolated. The array system is composed of M * N units and is matched with a feed source antenna and a control module, transmission beam scanning, reflection, retroreflection and transmission and reflection cooperative work are achieved through three control methods, and directional communication and radar echo camouflage / enhancement are completed at the same aperture. The device is compact in structure, low in cost, low in power consumption, stable in phase regulation and control, adaptive to light platforms such as an unmanned aerial vehicle and capable of being applied to scenes such as cooperative communication and electronic countermeasure.

The application discloses a broadband dual-circularly polarized phased array antenna loaded with a mixed decoupling structure and relates to the technical field of antennas.The broadband dual-circularly polarized phased array antenna loaded with the mixed decoupling structure comprises a first metal layer, the first metal layer comprises a Chinese character-shaped metal strip and four pairs of concave Chinese character-shaped metal strips, the first metal layer is arranged on the upper surface of a top layer dielectric substrate, a second metal layer is arranged on the lower surface of the top layer dielectric substrate, the Chinese character-shaped metal strip is connected with the second metal layer through a grounding metal column, a third metal layer is arranged on the upper surface of a bottom layer dielectric substrate, a metal bottom plate is arranged on the lower surface of the bottom layer dielectric substrate, the second metal layer is connected with the metal bottom plate through an isolation metal column, the isolation metal column passes through an intermediate layer prepreg adhesive sheet and the bottom layer dielectric substrate, the third metal layer is connected with the metal bottom plate through a metal probe, and the third metal layer is bonded with the second metal layer through the intermediate layer prepreg adhesive sheet.The application provides a decoupling scheme with high performance, low cost and easy integration.

The application discloses a dual-band multi-polarization common-aperture array antenna, and relates to the technical field of microwave antennas, comprising a low-band horizontal polarization array antenna, a low-band vertical polarization array antenna, a high-band vertical polarization array antenna and an electromagnetic surface realized by a dielectric, a copper foil sheet and a dielectric metallization structure; wherein the dielectric is a laminated structure realized by four-layer dielectric plates, and the four-layer dielectric plates are respectively a first dielectric plate, a second dielectric plate, a third dielectric plate and a fourth dielectric plate; each array antenna comprises a plurality of two-dimensionally distributed planar dipoles, and the planar dipoles of the low-band horizontal polarization array antenna are first planar dipoles; the height of the dual-band multi-polarization common-aperture array antenna is 0.12 lambda 0, less than half of the height of a conventional dipole antenna, and the radiation arm length is also shorter, so that the dual-band multi-polarization common-aperture array antenna has the characteristics of flatness and low profile compared with a conventional dipole realized by a metal rod or a metal plate.

The invention discloses a low-power-consumption integrated beam scanning antenna based on a programmable metasurface, which is formed by arranging m * n metasurface antenna units, and the metasurface antenna units can perform 2-bit phase regulation and control, the unit comprises a top-layer patch, a first-layer dielectric substrate, a direct-current bias layer, a PP layer, a metal floor, a second-layer dielectric substrate and a feed transmission line which are stacked in sequence, the top-layer patch comprises an extension branch knot, a slotted square ring patch and an internally nested square patch, and the extension branch knot is arranged on one side of a non-slotted side of the slotted square ring patch; the extension branch knot, the square patch and the slotted square ring patch are connected through radio frequency switches; the direct current bias layer provides direct current bias voltage for the radio frequency switch; the feed transmission line is used for realizing radio frequency energy transmission. The antenna provided by the invention can realize a good beam scanning effect under the conditions of low power consumption and high integration level, and is expected to be further applied to the fields of space-air-ground integrated communication, Internet of Things and the like.

The invention discloses a multi-beam digital transmission metasurface design method adaptive to direct communication of the Internet of Vehicles. The metasurface works in a 5.9 GHz frequency band and is composed of 40 * 40 double-C-shaped slot loading units, 2-bit transmission phase coding is achieved by adjusting inner-layer slot parameters of the units, and the transmission amplitude is superior to-2dB. According to the design, a quadrant partition beam forming method is adopted, an array is divided into four sub-regions, superposition codes of a focusing phase and a specific deflection phase are loaded respectively, and therefore four symmetrically-distributed high-gain beams are synchronously generated. Simulation results show that main beams of the array respectively point to azimuth angles of 45 degrees, 135 degrees, 225 degrees and 315 degrees, pitch angles are all 30 degrees, the maximum gain reaches 14.2 dBi, the narrow-beam and low-sidelobe characteristics are achieved, and the problem of efficient coverage of one source and multiple directions in an Internet of Vehicles scene is effectively solved.

The application discloses a broadband low-profile frequency selective surface and a design method, comprising a plurality of periodically arranged frequency selective surface units, the frequency selective surface units sequentially comprise an upper layer metal resonant structure, a first dielectric layer, an intermediate metal resonant structure, a second dielectric layer and a lower layer metal resonant structure; the upper layer metal resonant structure and the lower layer metal resonant structure constitute a double-mode coupled resonator, the intermediate metal resonant structure is used for providing an additional resonant frequency and adjusting electromagnetic coupling of the upper layer metal resonant structure and the lower layer metal resonant structure, so that the frequency selective surface forms a plurality of adjacent resonant frequencies in a target frequency band and realizes a broadband bandpass response. The application realizes a broadband bandpass response through cooperation of a plurality of resonant frequencies, and improves a control freedom degree of structure parameters on resonant frequencies and coupling strength.

The invention discloses a high-order mode microstrip antenna with a high-gain single beam and double beams, which comprises a dielectric substrate, one surface of the dielectric substrate is provided with an antenna radiation patch, the other surface of the dielectric substrate is provided with a metal floor, the antenna radiation patch adopts coaxial feed, and the antenna radiation patch is provided with four grooves and two gaps; a high-order mode TM02 mode and a high-order mode TM50 mode are excited through coaxial feed, through the synergistic effect of four grooves and two gaps, the out-phase current of the microstrip antenna working in the TM50 mode flows around the antenna radiation patch, and the sidelobe level of the high-order mode microstrip antenna working in the TM50 mode is reduced; due to the fact that the groove and the gap are loaded in the vertical direction of the TM50 mode current, namely the horizontal direction of the TM02 mode current, the symmetrical dual-beam performance of the TM02 mode is not affected.

The application discloses a broadband high-gain circularly polarized array antenna and a beam forming method, belongs to the technical field of wireless communication, and solves the problem of how to improve the circularly polarized working bandwidth of a radial line array antenna. One end of each coupling probe penetrates through the top of a radial line cavity feeding structure from the outside, penetrates into a preset length of an air cavity, and the other end of the coupling probe is correspondingly connected with a radiation array element outside the radial line cavity feeding structure. A plurality of the radiation array elements are arranged into multiple concentric circular rings and are annularly distributed on the top of the cavity of the radial line cavity feeding structure. Adjacent circular rings of the radiation array elements are arranged in a circumferential direction with a preset angle of rotation, there is a preset distance difference between the adjacent circular rings of the radiation array elements in the radial direction, and there is a preset phase difference between the adjacent circular rings of the radiation array elements. The application effectively expands the circularly polarized working bandwidth of the antenna by introducing a sequential rotation feeding technology between adjacent circumferential array elements.

This invention discloses an optically transparent fractal monopole antenna for Bluetooth ISM and 5G Sub-6GHz, belonging to the fields of microwave antenna design and transparent optoelectronic technology. The antenna includes a transparent laminated composite dielectric substrate, a transparent metal mesh radiating layer disposed on its upper surface, and a coplanar waveguide feeding structure. The transparent laminated composite dielectric substrate consists of a PMMA substrate and a PET film from bottom to top. The transparent metal mesh radiating layer constitutes a ring-based iteratively stacked fractal monopole radiator, which is generated through a three-order iterative fractal process: the first order is an outer ring, the second order is eight intersecting stacked inner rings formed by scaling and rotation, and the third order is a petal-shaped continuous radiating surface formed by filling the overlapping region and connecting the central hollow region. This invention achieves continuous broadband coverage of the core frequency bands of Bluetooth ISM and 5G Sub-6GHz within a compact size, possessing both excellent optical transparency and stable radiation performance.

The invention discloses an embedded common-caliber antenna structure which comprises a truncated conical cavity, and a high-frequency circular microstrip patch antenna group and a low-frequency circular microstrip patch antenna group are sequentially and coaxially arranged in the truncated conical cavity from top to bottom. The high-frequency circular microstrip patch antenna group comprises a high-frequency feed part which is arranged coaxially with the truncated cone cavity, and the low-frequency circular microstrip patch antenna group comprises a low-frequency feed part which is arranged coaxially with the truncated cone cavity. An isolating ring belt is arranged between the high-frequency circular micro-strip patch antenna group and the low-frequency circular micro-strip patch antenna group, and a gap is reserved between the isolating ring belt and the truncated conical cavity; according to the invention, the problem that the horizontal plane gain is low after the common-aperture antenna is embedded into the cavity is solved, and the compact antenna structure and the high isolation of the common-aperture antenna are ensured.