221results about How to "Reduce section height" patented technology

The invention discloses an improved-type low-profile low-scattering strong-coupling UWB (ultra wide band) phased array, and the phased array comprises a series of dipole radiation unit layers which are regularly and periodically printed on one thin dielectric layer. A rectangular paste placed below a dipole antenna unit in each radiation unit layer can improve the capacity coupling of the tail endof the antenna unit. A metal periodic structure is added to a second wide angle impedance matching layer of the antenna, and the asymmetric processing of two grounded metalized through holes is performed. The above measures can effectively improve the unit active standing-wave ratio during H plane scanning, and effectively inhibit the mode item scanning. The second wide angle impedance matching layer can effectively reduce the single-station RCS during the vertical incidence of co-polarized waves. The antenna provided by the invention is especially suitable for a hidden carrier platform in anew generation.

The invention relates to a pre-tensioning prestressed composite beam structural system and a construction method of the pre-tensioning prestressed composite beam structural system. Lower longitudinal reinforcements are bound and lapped on lower longitudinal prestress wires in composite frame beam prefabricated components; the lower longitudinal reinforcements are inserted into frame pillars; second pre-buried steel plates are buried in the lower end portions of the composite frame beam prefabricated components; lower portion longitudinal prestress wires are buried in the composite frame beam prefabricated components; secondary beam longitudinal reinforcements are lapped and bound on the lower portion longitudinal prestress wires; the second pre-buried steel plates are welded with the secondary beam longitudinal reinforcements; first pre-buried steel plates opposite to the second pre-buried steel plates are arranged on the composite frame beam prefabricated components; pitch point steel plates are respectively welded on the first pre-buried steel plates and the second pre-buried steel plates; and the pitch point steel plates are connected through bolts, which enables the composite frame beam prefabricated components to connect with composite secondary beam prefabricated components. Wires and longitudinal reinforcements are lapped to use in the pre-tensioning prestressed composite beam structural system, and therefore the connecting mode of the pre-tensioning prestressed composite beam structural system is scientific and reasonable, and quality is safe and reliable.

The invention discloses a K / Ka dual-band common-aperture antenna array, aiming to provide an antenna array surface capable of reducing the antenna profile, covering K and Ka bands and sharing a dual-band aperture. The invention is implemented by the following technical schemes: K-band patches are distributed on a dielectric substrate in the form of a uniform rectangular array, Ka-band patches areinterspersed in the center of the interval of adjacent K-band patches in an interpolation manner, the K-band patches are in orthogonal connection with a bonding pad located on the bottom surface of the dielectric substrate through a feeder pillar that penetrates through the dielectric substrate, the bonding pad is connected with a coaxial feeder, and the coaxial feeder penetrates through a metal base plate to connect with the bonding pad and feeds in a touch-type connection manner, wherein the K-band patches are combined with the metal base plate through the feeder pillar to form a K-band antenna array surface, the feeder pillar is connected with the coaxial feeder through the bonding pad to form a K-band channel; and the Ka-band patches are combined with the metal base plate through the feeder pillar to form a Ka-band antenna array surface, and the feeder pillar and the bonding pad conduct the coaxial feeder to form a Ka-band channel.

The invention discloses an ultra-wideband planar phased array antenna and a beam scanning method thereof, and relates to the technical field of antennas. The ultra-wideband planar phased array antennacomprises a dielectric substrate, and a liquid crystal phase shifter network which is externally applied with a bias voltage and arranged on the dielectric substrate, wherein the liquid crystal phaseshifter network is composed of a plurality of liquid crystal phase shifter units. An antenna unit array which covers a plurality of frequency bands is arranged above the liquid crystal phase shifternetwork; and the antenna unit array is composed of a plurality of antenna units, wherein the antenna unit is a Vivaldi antenna with a slot line, and a liquid crystal phase shifter is powered through amicrostrip line-slot line structure. Compared with the prior art, the problems that the ultra-wideband phase-controlled profile is high in profile degree, large in antenna loss and low in utilizationrate are solved.

The invention provides a phased-array antenna subarray for circularly polarized wide-angle scanning, and aims at providing a phased-array antenna subarray which has a good wide-angle scanning gain characteristic and a good wide-angle scanning circular polarization characteristic, and can avoid derotation properly. The phased-array antenna subarray is achieved by the technical scheme as follows: three circularly polarized microstrip antenna radiation patches are distributed on a microstrip antenna dielectric plate (10) in a ternary rotary inversion subarray form; a metal layer (6) at the lower part of the microstrip antenna dielectric plate serves as a metal place for three microstrip antenna units; each coaxial joint inner core (3) and each coaxial joint outer core (4) form a coaxial feeding port; each coaxial outer core is connected with the metal place; each coaxial joint inner core is connected with the corresponding radiation patch located in the microstrip antenna dielectric plate in blind-inserting and non-contact manners; and the coaxial feeding ports perform electromagnetic coupling feeding and implement phase compensation on the microstrip antenna units to obtain a subarray radiating left-hand circular polarization electromagnetic waves or a subarray radiating right-hand circular polarization electromagnetic waves.

The invention discloses an ultra-low profile strong coupling ultra-wideband phased array antenna based on a magnetic medium type artificial magnetic conductor structure. The antenna comprises a radiation unit layer printed on an ultra-thin medium layer and an artificial magnetic conductor reflecting plate. The tail ends of dipole antenna units in the radiation unit layer are respectively extendedto the tail ends of adjacent dipole antenna units to form an interdigital capacitor capable of enhancing the capacitive coupling amount between the units. The antenna can achieve two-dimensional wide-angle scanning with + / -60 degrees in a 3.3-times frequency interval range, an artificial magnetic conductor structure by taking the magnetic medium as a medium substrate is loaded, and the height of the section of the antenna is only about 0.03 times of the high-frequency wavelength to meet the requirements of ultra-wideband wide-angle scanning and ultra-low section of the antenna. The ultra-low profile strong coupling ultra-wideband phased array antenna is especially suitable for an application platform requiring the ultra-wide working band and meeting the ultra-low section requirements of the antenna.

The invention discloses a Ka wave band flat plate gap array antenna monopulse feed network. The feed network is composed of parts such as a radiation gap feed layer, a power distribution network, a monopulse network and the like, wherein the power distribution network adopts a feed waveguide broadside opening inclined joint form, and is used for carrying out coupling feed on the radiation gap feed layer and controlling the feed power through adjusting a feed waveguide centre gap tilt angle; the monopulse network adopts four flat surface magic Ts to form a sum and difference channel in a bell socket manner, and is used for feeding to the power distribution network through a coupling gap, and each flat surface magic T is provided with an inverted-step-shaped metallic membrane, which is used for carrying out voltage standing wave ratio distribution and improving standing wave band width and amplitude-phase consistency band width of each magic T; and coupling folded wave guide is adopted, thus the array radiation gaps are arranged at the same interval, the distance between the last feed inclined joint and the short-circuit end is 1 / 2 waveguide wavelength, and the problem of mutual interference among feed waveguides is solved.

The invention provides a low-profile low-elevation high-gain circularly polarized electromagnetic dipole antenna for satellite communication, and belongs to the field of satellite mobile communication. According to the antenna, the electric dipole radiation arms are designed into specific fan shapes, so that the impedance bandwidth of the antenna is effectively expanded; the beam width of the antenna is expanded through the parasitic magnetic dipole, and the gain at the low elevation angle is increased; meanwhile, a novel AMC structure (an artificial magnetic conductor reflecting surface) is adopted and is suitable for an electromagnetic dipole antenna, the AMC structure is compact, the design is simple, and the profile height of the antenna can be effectively reduced; and an air layer is introduced between the dielectric substrate and the AMC, so that the impedance bandwidth of the antenna is widened, and the gain of the antenna is increased. Therefore, the overall size of the antenna is 0.48[lambda]0*0.48[lambda]0*0.054[lambda]0([lambda]0 is the working wavelength at the center frequency point of the antenna), and the antenna has the characteristics of miniaturization and low profile.

The invention discloses a large-scale MIMO antenna structure and a manufacturing process. The large-scale MIMO antenna structure comprises multiple antenna units arranged in an array; each antenna unit is composed of three or more layers of dielectric plates; the PCB substrate has a structure of two layers of dielectric plates and three metal layers, a power division network and a calibration network are merged on a transmission line structure of the middle metal layer, and upper conductive metal and lower conductive metal are grounded; each antenna unit is connected with the substrate through a metal probe for feed; and the antenna adopts an SMT process to be directly welded on a corresponding antenna unit pad on the substrate, the precision is ensured through welding, and no adjustment is needed. The profile is low, the structure is compact, the integration is high, the weight is light, only few assembly steps are needed, the production efficiency is high, and high consistency and stability can be ensured.

The invention provides a low-profile broadband circularly polarized antenna for 5G communication and a design method thereof and belong to the technical field of microwave passive devices and the antenna comprise an antenna radiation assembly, a reflector assembly and an antenna feed assembly. The antenna radiation assembly is used for signal radiation, and the reflector assembly is used for reflecting radiation signals of the antenna radiation assembly. The antenna radiation assembly comprises an upper layer microwave dielectric substrate and first and second irregular slotted rectangular patch antennas etched on the upper and lower surfaces of the upper layer microwave dielectric substrate. The reflector assembly comprises a lower layer microwave dielectric substrate and a plurality of AMC reflectors distributed on the upper surface of the lower layer microwave dielectric substrate at equal intervals. The AMC reflectors are loaded below the first irregular slotted rectangular patch antenna and the second irregular slotted rectangular patch antenna; and the antenna feed assembly provides feed for the first irregular slotted rectangular patch antenna and the second irregular slotted rectangular patch antenna. L-shaped grooves are respectively etched in the first irregular slotted rectangular patch antenna and the second irregular slotted rectangular patch antenna; and the antenna is low in profile and small in size, contains 5G, is compatible with a 4G frequency band, and is wide in bandwidth after being loaded with an artificial magnetic conductor.

The invention discloses a composite beam comprising a steel beam with concrete at the abdomen. The composite beam comprises a steel beam (1) and a floor plate (7), wherein the concrete (5) is poured at the abdomen of the steel beam (1); the outer wall of the concrete (5) is flush with the outer sides of an upper flange and a lower flange of the steel beam (1); a steel reinforcement cage (4) is embedded at the abdomen of the steel beam (1); an abdomen shearing force connecting piece (3) is welded at the abdomen of the steel beam (1); reliable bonding and joint working of the concrete at the abdomen of the steel beam and the steel beam (1) are ensured through the abdomen shearing force connecting piece (3); outer shearing force connecting pieces (2) are welded at the outer side of the upper flange of the steel beam (1); and combination and joint working of the steel beam (1) and the floor plate (7) are realized through the outer shearing force connecting pieces (2). Compared with the prior art, the combination with the floor plate is taken into account, the whole bearing capacity and rigidity are improved, the section height of a member is decreased, and the building clearance is increased, so that the economic performance is greatly improved.

The invention discloses a broadband low-profile helical antenna with a loaded parasitic patch. The broadband low-profile helical antenna with the loaded parasitic patch comprises a dielectric substrate, a metal grounding plate and a coaxial feed device, wherein the metal grounding plate is printed on the dielectric substrate, the outer surface of the coaxial feed device is connected with the grounding plate, an inner core of the coaxial feed device is connected with the bottom of a spiral metal piece, and a metal patch used for enhancing electromagnetic coupling with the spiral metal piece is arranged above the spiral metal piece. According to the broadband low-profile helical antenna with the loaded parasitic patch, a parasitic metal patch is loaded on the spiral metal piece in an electromagnetic coupling mode so that performances of a patch helical antenna can be effectively improved, profile height of the antenna is reduced, and meanwhile, symmetry of antenna radiation pattern in whole working bandwidth can be improved.

The invention discloses a circularly polarized ridge waveguide slot antenna. The circularly polarized ridge waveguide slot antenna comprises circularly polarized radiators, twist polarized cavities, excitation slots and a ridge waveguide, wherein the ridge waveguide comprises a metal ridge and a waveguide, the metal ridge is arranged on the bottom surface of the waveguide, the excitation slots are formed on the upper surface of the waveguide and used for transmitting energy in the ridge waveguide to the twist polarized cavities, one of the two twist polarized cavities is connected with the excitation slot and used for receiving a signal of a first polarization state radiated by the excitation slot, and the other polarized cavities is connected with the circularly polarized radiators and used for radiating the signal with the changed state out. The circularly polarized ridge waveguide slot antenna has the advantages of low profile, high efficiency and compact structure, is easy to process, can be taken as an array combination unit of a co-aperture dual circular polarization antenna or circularly polarized phased-array antenna, and is suitably used for airborne or satellite-borne occasions with limited requirement for weight and space.

The invention provides a dual-polarization dielectric resonator antenna unit, and the dielectric resonator antenna unit comprises a substrate, a dielectric resonator and a director, wherein the substrate, the dielectric resonator and the director are sequentially connected from the bottom to the top. The upper surface of the substrate is provided with a grounding surface, and a gap is disposed in the grounding surface in an etching manner. The lower surface of the substrate is provided with a microstrip feed line which is matched with the gap and is used for feed. The projections of the dielectric resonator and the director on the substrate cover the gap. According to the embodiment of the invention, the dielectric resonator antenna unit meets the requirements of low profile and high gain of a dual-polarization dielectric resonator antenna unit. Moreover, a feed structure of the dielectric resonator antenna unit is symmetric, and is liable to assemble. In addition, the invention also discloses a base station antenna comprising the dielectric resonator antenna unit.

The invention discloses a multi-channel tile-type phased-array transceiver array and a manufacturing method thereof, and belongs to the technical field of phased arrays. The array of the invention comprises a sub-array module layer, a heat dissipation layer and a functional circuit layer, and the sub-array module layer comprises a sub-array module. The sub-array module comprises an upper metal shell and a lower metal shell, wherein a closed cavity is formed between the upper metal shell and the lower metal shell. The upper surface of the upper metal shell is provided with an antenna circuit board, and a lower surface of the upper metal shell is provided with a transceiver circuit board. A power distribution / synthesis network and a power supply control interface are disposed on the transceiver circuit board. The lower metal shell is provided with a second RF connector and a low-frequency connector, and the low-frequency connector is mutually connected with the power control interface. The array has the advantages of good heat dissipation and airtightness, high degree of integration, small size, light weight and convenient use, can effectively reduce the profile height of the array,and is beneficial to realize integration and miniaturization of the array.

The invention belongs to the technical field of an omnidirectional circular polarized antenna and discloses a microminiature low profile omnidirectional circular polarized antenna. The antenna comprises a radiation portion, wherein the radiation portion comprises an upper medium board, four coupling plates, a circular metal ring, a circular metal disc and a center metal column, and the coupling plates, the circular metal ring and the circular metal disc are printed on an upper surface of the upper medium board. The antenna is advantaged in that four metal short circuit columns are connected between tail ends of the coupling plates and a metal floor, a current spreading path on the coupling plates is extended, the transverse dimension of the antenna is effectively reduced, and profile height is further reduced; the inner coupling plates are added in the outer coupling plates, coupling energy among antenna units is enhanced, compared with the prior art, on the condition that directional diagram performance is guaranteed, the dimension of the antenna is substantially reduced, the coupling energy among the control units can be excellently controlled through adjusting distances between the inner coupling plates and the outer coupling plates and length of the inner coupling plates, and thereby antenna work frequency is adjusted.

The invention discloses a large-scale MIMO active antenna array applied to 5G millimeter wave communication. The large-scale MIMO active antenna array comprises an antenna array, a multifunctional board, a multi-channel TR module and a wave control power supply module, wherein the antenna array is correspondingly arranged on the multifunctional board, and the multi-channel TR module and the wave control power supply module are fixed on the multifunctional board and connected with the antenna array; the invention adopts a large-scale array antenna technology to achieve directional signal transmission, utilizes the directional gain of the phased array antenna to offset the space path loss of the signals, and utilizes the characteristic of dynamically adjustable beam pointing of the phased array antenna to achieve the multiplexing of the space dimensionality of the signals to greatly reduce the mutual interference among users, powerfully improve the capacity of the system and achieve low-power and high-efficiency signal transmission.

The invention discloses a heavy truck frame assembly. The heavy truck frame assembly comprises a transverse beam (1), a left longitudinal beam (2) and a right longitudinal beam (3). The left longitudinal beam (2) is connected with the right longitudinal beam (3) through the transverse beam (1). C-shaped section beams are adopted as the left longitudinal beam (2) and the right longitudinal beam (3). The left longitudinal beam (2) and the right longitudinal beam (3) are of a symmetric structure. Each of the left longitudinal beam (2) and the right longitudinal beam (3) is composed of a front bearing section (21), a connecting transition section (22) and a rear bearing section (23), wherein an upper plane of the front bearing section (21), an upper plane of the connecting transition section (22) and an upper plane of the rear bearing section (23) are located on the same horizontal plane, and the section height of the front bearing section (21) is smaller than that of the rear bearing section (23). The heavy truck frame assembly has the beneficial effects that the bearing capability is high, the anti-twisting capability is high, the overall mass is low, and the fuel economy is high.

The invention discloses a compact low-coupling tri-polarized MIMO antenna based on a planar structure, and belongs to the antenna field of communication technology. The antenna is formed by stacking two layers of dielectric plates. The top surface of the upper dielectric plate is coated with a main radiator metal patch. The bottom surface of the lower dielectric plate is a grounding metal plate; aparasitic metal patch is arranged between the two layers of dielectric plates; a plurality of first metal via holes connected with the parasitic metal patch and the main radiator metal patch are formed in the upper dielectric plate; and a plurality of second metal via holes connected with the main radiator metal patch and the grounding metal plate are formed in the two layers of dielectric plates. Feed is carried out at different positions of the main radiator metal patch of the antenna, and three orthogonal polarizations can be realized at the same frequency. Compared with an existing tri-polarized MIMO antenna, the tri-polarized MIMO antenna has smaller size and lower coupling, is more suitable for small terminal equipment, is more suitable for forming an antenna array, and can also beused as a unit of a compact large-scale MIMO antenna.

The invention discloses an anti-multipath interference antenna for a GNSS. The anti-multipath interference antenna is miniaturized, low in profile, low in cost and easy to process. The anti-multipath interference antenna comprises a first medium layer and a floor fixed on the upper surface of the first medium layer. The floor is provided with an annular groove and divided into an internal area and an external area by the annular groove. The internal area and the external area are connected through a plurality of lumped resistors which are connected to the two sides of the annular groove in a bridging mode. A second medium layer and a microstrip patch layer are fixed on the upper surface of the internal area of the floor, wherein the microstrip patch layer is fixed on the upper surface of the second medium layer. According to the anti-multipath interference antenna, as it is unnecessary to arrange a multilayer fold structure on the floor, the profile height of the antenna can be reduced greatly. The antenna is small in size, light in weight, low in cost, small in lateral dimension and convenient to install and carry. Compared with a solid floor with the same size, the backward cross-polarization of the antenna can be lowered by 13dB or more to the maximum degree, and the maximum gain of co-polarization can keep unchanged basically. The anti-multipath interference antenna is suitable for being popularized and applied in the technical field of GNSSs.

The invention discloses an inverted-F broadband antenna suitable for vehicle's mobile communication. The inverted-F broadband antenna comprises a monopole radiating body and a metallic baseboard, wherein the monopole radiating body is formed by thickening one rectangular metal sheet by forming an edge profile, and the different positions along the edge profile of the rectangular radiating body are inward provided with multiple grooves, the monopole radiating body is arranged on the metallic baseboard, the long edge of the monopole radiating body is placed along a horizontal direction, the feed is supplied to the gap between the left lower endpoint of the monopole radiating body and the baseboard, and the right lower endpoint to the metallic baseboard is in a short-circuit status. The antenna operates in high and low frequency bands, the low frequency band is 689MHz-960MHz (VSWR (Voltage Standing Wave Ratio) is no more than 2.15 and the bandwidth is 31.60%), the high frequency band is 1260MHz-6500MHz (VSWR is no more than 2.17 and the bandwidth is 135.05%), and the antenna covers all mobile communication frequency bands of three operators 2G / 3G / 4G, thus the antenna is extremely wide in frequency band, excellent in directivity, high in efficiency, small in size, low in profile and easy to process; the antennas is suitable for the optimized antenna type of high-speed rail mobile communication and beneficial to reduce the air resistance of a train which runs at a high speed.

The invention discloses an ultralow-profile low-scattering ultra-wideband phased-array antenna based on electromagnetic metamaterial loading, which realizes E-plane + / -70-degree scanning and H-plane + / -60-degree scanning in a 6-18GHz broadband, and the profile height of the ultralow-profile low-scattering ultra-wideband phased-array antenna is only 0.28 high-frequency (18GHz) wavelength. The loaded electromagnetic metamaterial is composed of a split ring periodic structure, an I-shaped resistive patch, an intersecting long-strip periodic structure and a plurality of wide-angle impedance matching layers, and through the integrated design of the electromagnetic metamaterial and the phased-array antenna, the phased-array antenna has the ultra-wide-band and ultra-wide-angle scanning characteristic and meanwhile has the remarkably low profile height. In addition, the cross polarization RCS of the phased-array antenna is remarkably reduced within the full-frequency range of the working frequency of the phased-array antenna, and meanwhile, the radiation efficiency of the phased-array antenna is kept above 95%.

A device with a lead wire surface mounting radar transmitting-receiving assembly comprises an integrated box body and a cover plate, the integrated box body comprises a ring frame, a substrate and a plurality of lead wires used as power supply, control signal, radio frequency input and radio frequency output interfaces. The cover plate is welded with the top of the ring frame, the bottom of the ring frame is welded at the periphery of the right side of the substrate, and the backside of the substrate is equipped with a rectangular cavity. The lead wires are welded at the rectangular cavity on the backside of the substrate, and are in paired arrangement at the two sides of the substrate. A radar transmitting-receiving circuit is arranged on the right side of the substrate, and the lead wires are electrically connected with the radar transmitting-receiving via metal holes. According to the present invention, by utilizing the substrate, namely a package technology, the substrate used for device loading and circuit wiring is used as a part of the package directly, thereby saving a pedestal of an assembly box body. By an interface technology having no connector and a cascadable feed technology, the transmitting-receiving assembly can be surface mounted and can be in cascade use, so that the transmitting-receiving assembly is miniature and light, and the profile height and the mass surface density of an active antenna panel can be reduced effectively.

The invention discloses a tuned mass damper for controlling vertical high-frequency vibration of floor slabs and a manufacturing method thereof. The tuned mass damper mainly comprises a gantry rigid frame, a weight and damping units; the gantry rigid frame is composed of pillars and a horizontal steel beam; the weight fixed on the horizontal steel beam is driven by vertical bending deformation of the horizontal steel beam to linearly reciprocate in the vertical direction; the weight is in a variable section form, thus the weight is centrally stressed on the horizontal steel beam, and height of the weight is reduced; eddy current damping units are used as damping elements, including two sets, used to keep balanced lateral stress; the whole damper is mounted inside a floor slab through a bottom steel plate, and partial rigidity of the floor slab is enhanced by the bottom steel plate. The tuned mass damper and the manufacturing method thereof have the advantages that high frequency required by the tuned massage damper for use in damping vertical vibration of floor slabs of industrial workshops is achieved, height of the damper is effectively reduced, and embedding the damper into the floor slab is facilitated.

The invention discloses a coplanar waveguide feeding-based miniaturized wideband dielectric resonator antenna. The coplanar waveguide feeding-based miniaturized wideband dielectric resonator antenna comprises a dielectric substrate, a coplanar waveguide and an annular dielectric resonator; the coplanar waveguide includes a grounding plate, a radiation patch and a feeding part; the feeding part comprises an annular patch and central strip lines; the grounding plate includes two parts, wherein the two parts are of symmetrical structure relative to the central strip lines; two symmetrical L-shaped notches and two symmetrical rectangular notches are formed in the grounding plate; the radiation patch is composed of four 1 / 4 circular patches which are symmetrical to each other in pairs; and the annular dielectric resonator is located just at the center of the annular patch. According to the coplanar waveguide feeding-based miniaturized wide-band dielectric resonator antenna of the invention, a coplanar waveguide feeding annular printed monopole antenna and dielectric resonator antenna-hybrid radiation mechanism is adopted; and a plurality of working modes of the resonator can be excited; and therefore, bandwidth can be expanded. The coplanar waveguide feeding-based miniaturized wide-band dielectric resonator antenna has excellent impedance matching performance, high radiation efficiency and high peak gain. The coplanar waveguide feeding-based miniaturized wide-band dielectric resonator antenna has broadband work performance with small size ensured.

The invention relates to a broadband dual-polarized high-density and high-isolation array antenna loaded with composite isolators and belongs to the field of a base station array antenna. The antennacomprises a metal floor; two + / -45-degree wideband dual-polarized crossed dipole antennas are disposed in parallel on the metal floor; each + / -45-degree wideband dual-polarized crossed dipole antennacomprises four radiation patches and two crossed dipole T-type micro-strip feeders, and two SMP (Symmetrical Multi-Processing) connectors which are respectively connected with the T-type micro-strip feeders; the composite isolators are disposed on the peripheries of the two + / -45-degree wideband dual-polarized crossed dipole antennas; each composite isolator includes four dielectric substrates which are respectively disposed on the peripheries of the + / -45-degree wideband dual-polarized crossed dipole antennas to encircle into a square; a metal wall is disposed on each dielectric substrate, away from one surface of the + / -45-degree wideband dual-polarization crossed dipole antennas; and a metal strip is disposed on each dielectric substrate, close to one surface of the + / -45-degree wideband dual-polarization crossed dipole antennas.

The invention discloses a high-gain low-section annular antenna based on substrate integrated waveguide feed, solving a problem that a section of an annular antenna is too high so that the annular antenna is not easy to be conformal with a carrier in a present airborne radar. The high-gain low-section annular antenna of the invention comprises a radiation unit (1), an upper medium plate (2), a lower medium plate (5), an upper metal layer (6) and a lower metal layer (7); the radiation unit is arranged on the upper surface of the upper medium plate; the upper metal layer and the lower metal layer are respectively arranged on the upper surface and the lower surface of the lower medium plate; the radiation unit adopts a symmetrical double-ring structure; a rectangle gap (4) is formed on the upper metal layer; a metalized through array (3) and a transition structure (8) are formed on the lower medium plate; the metalized through hole array go through the upper metal layer, the lower medium plate and the lower metal layer and constitutes a substrate integrated waveguide feed structure with the upper metal layer, the lower medium plate and the lower metal layer. The high-gain low-section annular antenna of the invention has advantages of the low section and high gain, can work at an X waveband and can be used for the radar system under an airborne platform.