150results about How to "Extended current path" patented technology

The invention discloses a planar-broadband dual-polarization base station antenna and belongs to the field of mobile communication base station antennae. The planar-broadband dual-polarization base station antenna mainly solves the problems that an existing base station antenna is complex in structure and has difficulty in being integrated with other devices. The planar-broadband dual-polarization base station antenna comprises radiation oscillators (1), feed baluns (2), a baffle board (3), coaxial cables (4), supporting columns (5) and a dielectric material plate (6). The radiation oscillators (1) are dual-polarization planar oscillators at +/-45 degrees, and the feed baluns (2) are planar feed baluns at +/-45 degrees. The radiation oscillator at -45 degrees and the feed balun at +45 degrees are printed on the upper surface of the dielectric material plate (6), and the radiation oscillator at +45 degrees and the feed balun at -45 degrees are printed on the lower surface of the dielectric material plate (6). The dielectric material plate (6) is fixed to the square baffle board (3) through the supporting columns (5). According to the planar-broadband dual-polarization base station antenna, planarization of the radiation oscillators and the feed baluns are achieved, meanwhile, the structure of the baffle board is simplified, and a stable directional diagram characteristic can be obtained in broadband.

The invention discloses a miniaturized low profile ultra-wideband logarithmic periodic monopole array antenna, which is characterized by using 22 monopoles operating at different frequencies to realize ultra-wideband characteristics. A radiation directional pattern is directed to the end-fire direction of an array. Part of the monopoles introduce a capacitor to reduce the profile of the overall cell by loading a plate capacitor to the top end; and a substrate with a higher dielectric constant is used to miniaturize a feeding line and the overall structure. The invention can satisfy the standing wave ratio VSWR (2.5, the height of the profile is 0.053 Lambda <l>, and the width is 0.061 Lambda <l> in the bandwidth range of 10.7:1, wherein the Lambda <l> is the wavelength corresponding to thelowest frequency point in the free space. The invention has the advantages that the vertical polarization end-fire directional pattern can be stably realized in the ultra-wideband range, and has thecharacteristics of low profile, compact structure, easy conformality and simple design. The design method and the result can provide theoretical guidance and performance evaluation methods for an airborne platform antenna unit and array, and can provide a new idea for solving conformal antennas on metal body platforms.

The invention discloses a broadband circular polarization capsule antenna combining a plane and a flexible medium and is a capsule antenna which is applied to the internal of the human body and has a broadband circular polarization characteristic and is arranged inside an endoscope. The broadband circular polarization capsule antenna firstly adopts a single-layer circular Rogers medium substrate which has a diameter the same as that of a capsule and coaxial feeding is performed from a bottom; two metal bands are perpendicular to each other on the upper surface of the substrate, wherein one of the metal bands is connected to the ground through short circuit in a position close to the end of a capsule wall and a non-balance feeding mode is formed with the coaxial feeding; on the basis of that, two metal bands on the upper surface of the substrate extend L-shaped branches to the capsule wall so as to achieve following effects: an antenna radiation caliber of the antenna is enlarged and radiation efficiency is increased. Furthermore, the broadband circular polarization capsule antenna of the invention does not occupy too much space inside the capsule while increasing current paths, can better realize miniaturization, forms two orthogonal modes in a needed frequency band and lays the groundwork for circular polarization performance.

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 an ultra-wideband planar monopole antenna. The ultra-wideband planar monopole antenna comprises a dielectric substrate, a monopole radiation patch, a lumped device and a grounding plate, wherein the monopole radiation patch is formed by loading a monopole antenna main body and a top end, a part, near to the grounding plate, of the monopole radiation patch employs a triangular corner and is mainly used for impedance matching of a high-frequency part. A lumped component loaded by the antenna main body is mainly used for reducing a working frequency band of the antenna andgain of a smooth antenna in the whole frequency band, a plurality of rectangular open-circuit branches are loaded at a top end of a monopole, the capacitance between the antenna and floor is improved, and the working frequency band of the antenna is further reduced. By loading the lumped component and additionally arranging open-circuit branches on ground, the antenna size is effectively reducedas well as favorable ultra-wideband characteristic is maintained, and the application of the antenna in the monitoring field is facilitated.

An embodiment of the invention provides a miniaturized Vivaldi antenna capable of realizing wide band. The antenna structure comprises three layers, wherein the second layer is a dielectric substrate prepared from a non-conductive material; the first layer comprises the floor in an antenna feed structure, two antenna radiation arms, two parasitic patches and two loaded lumped resistors; the third layer is a microstrip in the antenna feed structure; the two parasitic patches are arranged below the two antenna radiation arms respectively; and the lumped resistors are used for being connected with the parasitic patches and the antenna radiation arms. By virtue of the parasitic patches, the antenna dimension is not enlarged, the current path on the surface of the antenna and the equivalent electrical length can be prolonged, and the shape and the dimension can be adjustable; and by virtue of the loaded resistors, energy reflection can be reduced, and antenna impedance characteristic can be improved, so that miniaturization of the antenna can be realized effectively, and the dimension of the antenna can be less than or equal to 0.3 times of the corresponding wavelength at the lowest working frequency.

The invention discloses a vehicle-mounted 4G knife type antenna comprising a dielectric substrate, an antenna radiating unit printed on the front side of the dielectric substrate, and a metal floor. The antenna radiating unit consists of a low-frequency radiated branch segment, a high-frequency radiated branch segment, and a short-circuit branch segment connected between the antenna radiating unit and the metal floor. A microstrip feeder line for feeding power for the antenna is arranged at the edge of the antenna radiating unit; and a parasitic coupling patch is arranged on the back of the dielectric substrate. The antenna has the following advantages: the requirement on the shark fin outer case dimension is met; the 4G frequency band bandwidth is covered; the standing wave characteristic in the frequency band is good; and the antenna is suitable for automotive 4G communication.

The invention provides a loop type coupling antenna, which includes: a feed-in wire, a coupling conductor, a first coupling part, a second coupling part, a second conductor and a ground surface, one end of the coupling conductor belongs to the first coupling part, another end belongs to the second coupling part; the feed-in wire connects with the first coupling part for providing a feed-in signal to the first coupling part; the feed-in signal couples to the second coupling part through the coupling conductor; one end of the second conductor connects with the second coupling part, another end connects with the ground surface that conduct signal of the second coupling part to the ground surface by using the second conductor. Impedance match can be adjusted efficiently by using the first coupling part, and antenna operation frequency width can be increased. The second coupling part and the second conductor reduce resonant frequency, and shorten wavelength of resonant path center frequency.

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 provides a frequency selection surface with miniaturized low frequency number ratio, which mainly solves the technical problems that two resonant frequency points in low frequency band are far away from each other and the electric size of a unit is large on the existing dual-band frequency selection surface. The frequency selection surface comprises a dielectric plate (2),a metal patch (1) printed on an upper surface of the dielectric board and a metal patch (3) printed on a lower surface of the dielectric board,a metal through hole (4) and a metal connecting wire (5) connectingadjacent units, Each metal patch consists of four metal strips arranged on the surface of the dielectric plate. The first two metal strips form two resonant points of TE polarization and the second two metal strips form two resonant points of TM polarization. The four metal strips of the upper and lower metal patches are connected through metal vias to prolong the current path. The invention realizes good miniaturization effect while possessing low-frequency digital ratio characteristics, and can maintain stable performance for different polarization and angles, and can be applied to antenna sub-reflector of communication system and small communication equipment.

The present invention discloses a differential feed implantable circularly polarized antenna working in an ISM (Industrial Scientific Medical) frequency band. The differential feed implantable circularly polarized antenna comprises an upper layer dielectric substrate, a lower layer dielectric substrate, an antenna radiation unit, a symmetrical coaxial and a floor. The antenna radiation unit is located between two layers of dielectric substrates; the floor is located below the lower layer dielectric substrate; and the symmetrical coaxial includes an upper right coaxial and a lower left upper coaxial, the upper right coaxial and the lower left upper coaxial are located at the diagonal of the antenna radiation unit and are centrally symmetrical with respect to the dielectric substrates. According to the invention, a current path is effectively prolonged, the size of an antenna is reduced, and circular polarization is generated so that multipath loss and polarization mismatch of signals may be effectively inhibited. The differential feed implantable circularly polarized antenna working in an ISM (Industrial Scientific Medical) frequency band has small size, wide axial ratio bandwidth and the like, and is applicable to the field of the human body local area network communication.

The invention provides an integrated luminous-region high-power vertical-cavity surface-emitting laser, comprising: an emitting hole, wherein isolating channels formed in the emitting hole divide theemitting hole into narrow emitting regions communicated with one another, and an insulating layer is arranged in each isolating channel; a conductive layer filling the isolating channels and extendedto two sides to gain ohmic contact with the narrow emitting regions. The emitting hole of the vertical-cavity surface-emitting laser with large oxidization pore size is divided into the narrow emitting regions; the narrow emitting regions gain contact with the conductive layer; on one hand, a current path in the emitting hole is extended, and the current density of the middle region of the vertical-cavity surface-emitting laser with large oxidization pore size can be effectively increased; on the other hand, current may propagate transversely from the conductive layer, distribution uniformityof current density in the mitting hole is greatly improved, and conversion efficiency is improved. In addition, coherence of outgoing light in large range is maintained. The integrated luminous-regionhigh-power vertical-cavity surface-emitting laser is applicable to laser radar, infrared cameras, depth recognition detectors and other fields.

The invention provides a high-voltage metal oxide semiconductor transistor, comprising a doped substrate, two first separation structures, a grid structure, a source area, a drain area, two separation structures and two shifting areas; wherein, two first separation structures are respectively arranged in the doped substrate; the grid structure is arranged on part of the two first separation structures and the doped substrate between the two first separation structures; the source area and the drain area are respectively arranged in the doped substrate at one side of the two first separation structures; two second separation structures are respectively arranged below the two first separation structures; furthermore, the upper surface of the second separation structure is less than the lower surface of the first separation structure; two shifting areas are respectively arranged in the doped substrate; furthermore, the source area, the drain area, two first separation structures and two second separation structures are surrounded.

The invention relates to the technical field of antennas, and particularly relates to a helicopter conformal omnidirectional short wave antenna for helicopter short wave radio communication. The conformal omnidirectional short wave antenna for helicopter short wave radio communication is composed of an antenna radiator (1) and a cable assembly (2), wherein the antenna radiator (1) and the cable assembly (2) are welded as a whole by a core wire, and a bottom feed mode is adopted. The conformal omnidirectional short wave antenna for helicopter short wave radio communication is characterized in that the conformal antenna technology is adopted, the antenna radiator (1) is mounted on the inner surface of a non-metallic and non-carbon fiber skin of the helicopter, the antenna radiator (1) has three sections, and the three sections are connected into a Z type with the consistent shape with the inner surface of the skin of the helicopter through fasteners. The antennas has better performance, and also has the advantages of simple layout, large radiation elevation angle, no jitter noise, no wire breaking phenomenon and no freezing phenomenon.

The invention discloses a graphene-based circularly-polarized intake antenna for a capsule endoscope device. The material of each radiation unit and floor of the antenna is a copper-coated graphene film, and the material of the copper-coated graphene film has relatively high carrier density, so that the working bandwidth and gain of the intake antenna can be increased. A graphene double-S combinedstructure radiation patch (4) and a graphene double-S combined structure radiation patch (5) are connected through four short-circuit probes to form a composite spiral structure, so that the circularpolarization characteristic is generated, and the bit error rate is reduced while multipath interference is suppressed. The hook-shaped combined structure of a graphene hook-shaped combined structureradiation patch can reduce the resonant frequency of the antenna and increase the impedance bandwidth of the antenna. The size of the antenna is only Pi*(4.5)<2>mm<3>, and the antenna has the characteristics of wide frequency band, circular polarization, interference resistance, good electromagnetic compatibility, small size and the like. The antenna is suitable for an ISM2.4GHz frequency band, and can meet the working requirements after the complex environment is ingested.

The invention relates to a miniaturized frequency selective surface, and belongs to the field of radar antennas. The frequency selective surface is formed by arranging a plurality of S*T same units inan equal-period mode, wherein each unit is composed of a dielectric plate in a regular hexagonal prism shape, two layers of metals printed on the upper surface and the lower surface of the dielectricplate and a metal via hole set vertically penetrating through the dielectric plate, the two layers of metals on the upper surface and the lower surface of the dielectric plate are respectively composed of three metal strip lines which are in rotational symmetry, each metal strip line is bent into an arrow shape, and the upper metal strip line and the lower metal strip line are connected through ametal via hole which vertically penetrates through the dielectric plate to form a 2.5 D frequency selection unit structure. The frequency selective surface designed by the invention has a good miniaturization characteristic, can still keep the band elimination performance in a stable frequency band when different polarized electromagnetic waves are incident at a large angle, and is suitable for the fields of wireless communication and radar.

The invention discloses a broadside coupled feeding multi-band frequency broadband planar antenna, which comprises a medium substrate, wherein the medium substrate comprises one surface regarded as a front side and another surface which corresponds to the front side and is regarded as an opposite side, the front side of the medium substrate is provided with a metal strip in the width direction, a first bent strip and a second bent strip are connected with the metal strip, the opposite side is provided with a metal surface and a monopole, the monopole is arranged from one side to the other side in the width direction, the monopole and the metal surface are separated by a gap, the monopole is fed by a feeding port formed by two feeding points which are near one side of the medium substrate and are respectively positioned and arranged at two sides of the gap, the mutual parts of projections of the metal strip and the monopole are overlapped, and in positions beyond the region being overlapped with the projection of the monopole, the metal strip is bent at the other side opposite to the feeding port and is then in short circuit with the metal surface through the metal through hole to form a short circuit strip. The broadside coupled feeding multi-band frequency broadband planar antenna has the advantages that the structure is simple, and the integration with a radio-frequency circuit system arranged on a PCB (printed circuit board) is easy.