53results about How to "Improve out of roundness" patented technology

The invention discloses a ridge waveguide planar array antenna employing mechanical center feeding. The ridge waveguide planar array antenna comprises a grid layer, a radiation layer, a coupling layer, a feed network layer and a center feed layer, which are sequentially stacked, wherein the mechanical center of the center feed layer is provided with a feeding opening which is vertical to an antenna array and is used for inputting and outputting a signal; the feed network layer is composed of a single ridge waveguide; and ridges are arranged at the centers of narrow sides of various branches of a ridge waveguide power divider on the feed network layer. Through introducing the grid layer and the center feed layer, adopting the design of a ridge waveguide power dividing network, and successfully combining with other structure layers, the targets of improving the out-of-roundness of an antenna radiation pattern, improving the antenna standing wave bandwidth and realizing mechanical center feeding of the antenna are achieved.

The invention provides a mini enhanced dual-polarization omnidirectional ceiling antenna. The antenna comprises a single cone, a horizontal polarization unit and a step-shaped floor which are arranged in a vertically coaxial and centrally overlapped manner from top to bottom successively, the single cone comprises a first single cone radiator and a second single cone radiator which are arranged in a crossing manner, the bottom of the single cone is provided with a feed point, and a coaxial feed cable is connected to the feed point in the bottom of the single cone by penetrating the step-shaped floor and the horizontal polarization unit from bottom to top successively. Within the frequency range from 0.8GHz to 2.70GHz, the single-cone ceiling antenna realizes effective impedance match, an ideal omnidirectional radiation performance, a substantial edge coverage enhanced effect, a consistent in-band coverage range, higher efficiency, higher port isolation degree (better than -24dB), small size and low profile and is suitable for indoor coverage. The antenna is also characterized by being novel in ideas, clear in principles, universal in methods, easy to realize, low in cost and suitable for batch production, the antenna can be used to replace a routine dual-polarization omnidirectional ceiling antenna, and can be used for design and improvement of a vertical-polarization enhanced omnidirectional ceiling antenna and a planar Alford loop antenna.

The invention relates to a high-strength spring steel wire machining method for an automobile bearing spring. The raw materials comprise carbon, silicon, manganese, phosphorus, sulfur, copper, nickel, chromium, molybdenum and iron. According to the high-strength spring steel wire machining method for the automobile bearing spring, a wire rod made by mutual cooperation between various assemblys and content thereof is very excellent in decarburization layer depth, non-metallic inclusion, surface quality, mechanical property and the like; after the wire rod is subjected to acid pickling and phosphatizing, the cold drawing is conducted on the wire rod, and a semi-finished product meeting the outer diameter requirements is formed; then a finished product is made through quenching, tempering and other working procedures; the calibrating straight length, the quenching temperature, the tempering temperature and the turning speed during the drawing process are chosen carefully, so that the wire diameter stability, the non-circularity, the tensile strength, the face shrinking rate and the like of the finished product are all higher than those of a finished product prepared through a traditional oil-quenching tempering spring steel wire technology.

The invention relates to a novel double-compacted steel wire rope and a production technology thereof, and aims to provide a steel wire rope which is stable in physical property and is compacted tightly as well as a production technology of the steel wire rope. All pickled and phosphatized steel wires are drawn for the first time, then annealed, dried and drawn again after dried, and various finished steel wire products are formed. Third center steel wires, inner-layer steel wires, filling steel wires and third outer-layer steel wires are twisted and then rolled, steel wire rope first outer-layer strands are produced and twisted on the outer side of a rope core in a wrapping manner, a steel wire rope is twisted, the twisted steel wire rope is forged, and the forged steel wire rope is warehoused. The section area of each steel wire rope first outer-layer strand after rolling is 8%-10% smaller than that before rolling, and the section area of the steel wire rope after forging is 10%-13% smaller than that before forging. The rope core adopts 7*7 independent steel cores.

The invention discloses a manufacturing method of austenitic stainless steel [section sign]150 small-specification continuously-cast circular tube blanks, and relates to the field of stainless steel production processes. The manufacturing method includes the specific preparation process of production in an electric arc furnace; AOD, LF, continuous casting; finishing; and delivery. According to themethod, on one hand, the smelting process is optimized, it is guaranteed that molten austenitic stainless steel can achieve the high-cleanliness metallurgical quality, and while the oxygen content and the inclusion content in steel are reduced, the situation that high-melting-point aluminum oxide is gathered on a continuous casting tundish water gap to affect continuous casting pouring is reduced. On the other hand, reasonable continuous casting process parameters are determined, and reasonable primary cooling water and secondary cooling water preparation parameters, crystallizer vibration parameters, covering slag types, pouring temperature, withdrawal speed, withdrawal and straightening machine pressure, electromagnetic stirring parameters and the like are formulated. Secondary oxidization is reduced in the pouring process, and contamination of the molten steel is reduced. The continuously-cast circular tube blanks produced with the method can be directly subjected to tube penetration, round steel forging and rolling procedures are reduced, the productivity can be greatly improved, and the production cost is reduced.

The invention discloses an improved structure of a wideband omnidirectional antenna, which comprises a shunt-fed wideband feed network and a plurality of groups of wideband vibrator sets connected with the shunt-fed wideband feed network, wherein all wideband vibrator sets respectively comprise first radiator, second radiator and parasitical vibrator which are sequentially arranged; choking tubesare respectively arranged on the heads and the ends of all wideband vibrator sets; the first radiators, the second radiators, the parasitical vibrators and the choking tubes are respectively in collinear connection and fixed on a metal support tube; an inner conductor of a coaxial feeder of the shunt-fed wideband feed network is respectively and electrically connected with the first radiators or the second radiators of various wideband vibrator sets; and an outer conductor of the coaxial feeder is electrically connected with the metal support tube. The improved structure has the advantages that: as the radiators, the parasitical vibrators, the choking tubes and the metal support tubes are collinearly arrayed and the coaxial feeder is integrated inside the radiators, the unroundness of theantenna is good and the small-sized integration of the antenna volume is realized while meeting wideband low standing wave and the shunt-fed wideband feed network improves the signal quality of the covering area while resisting the interference.

The invention discloses a vertical polarization omni antenna. The vertical polarization omni antenna comprises a base plate, a monopole, a coaxial cable and a short circuit paster. The monopole comprises a first center part and a plurality of first radiation parts. The inner end of each first radiation part is connected with the first center part, each first radiation part extends in the direction far away from the first center part, and the monopole is arranged above the base plate. The short-circuit paster comprises a second center part, a plurality of second radiation parts and a plurality of connecting parts, wherein the inner end of each second radiation part is connected with the second center part, each second radiation part extends in the direction far away from the second center part, the connecting parts are correspondingly connected with the second radiation parts in a one-to-one mode, each connecting part is connected with the base plate, and the short-circuit paster is arranged above the monopole and separated from the monopole. The vertical polarization omni antenna has the advantages of being small in size, simple in structure, easy to machine, low in cost, good in out-of-roundness and cross polarization index, very wide in working frequency band and the like.

The invention discloses an ultra wide band horizontal polarized horizontal omnidirectional antenna, comprising at least three arms integrated antenna elements. The arms integrated antenna elements comprises a folded dipole element and a parallel feeder. The folded dipole element comprises two inverted U shaped conductor sheets that are mirror symmetric as the upper arm and the lower arm. The right ends of the two inverted U shaped conductor sheets are connected by bent portion. The left ends of the two inverted U shaped conductor sheets are disconnected and respectively connected with one of two parallel feeders. The at least three arms integrated antenna elements are rotationally distributed around a center point. The parallel feeder converges at the center point. The center point is a feed point. The ultra wide band horizontal polarized horizontal omnidirectional antenna utilizes a folded dipole as a radiation element, in order to obtain the high impedance and fed and broadband after arraying and parallel feed. The ultra wide band horizontal polarized horizontal omnidirectional antenna increases gains significantly, optimizes the maximum radiation direction, puts up and down into the ideal level, obtains better cross polarization ratio and improves efficiency significantly. The ultra wide bandwidth simplifies the design of feed network, and is more convenient to debug and optimize.

The invention relates to an indoor distribution antenna. The antenna is characterized by comprising a horizontal polarization radiation unit, the horizontal polarization radiation unit is composed of two parts located on the top surface and the bottom surface of a dielectric plate, the bottom surface part comprises a circular patch, four pairs of inverted L-shaped patches, four T-shaped patches and four parasitic patches, the top surface part is provided with a one-to-four power divider; and the antenna further comprises a vertical polarization radiation unit which comprises eight E-shaped patches, a circular hollow patch and four metal sheets connected with the circular hollow patch and the horizontal polarization radiation unit. The indoor distribution antenna has the characteristics of low cross polarization level, high port isolation, low out-of-roundness, high gain and low profile.

The invention relates to a dual-polarized high-isolation indoor distribution antenna. The antenna is characterized by comprising a vertical polarized antenna which comprises two semicircular copper sheets perpendicular to each other and a circular copper sheet located above the semicircular copper sheets, and feeds through a feed hole located in the center of a dielectric plate; the antenna further comprises a horizontally polarized antenna which is composed of two parts located on the upper surface and the lower surface of the dielectric plate, four printed dipoles, four arc parasitic patches and four metal strips are arranged on the upper surface of the dielectric plate, a one-to-four power divider is arranged on the lower surface of the dielectric plate, and a dumbbell-shaped structure formed by gaps and rectangular holes is arranged in the middle of the printed dipoles. The indoor distribution antenna can cover the frequency bands of 1.71 GHz to 2.69 GHz and 3.3 GHz to 3.6 GHz at the same time, is applied to 3G/LTE/5G, and has the characteristics of high port isolation, low out-of-roundness and low profile.

The invention provides a satellite navigation antenna which comprises a first printed symmetrical dipole circuit board and a second printed symmetrical dipole circuit board. Two printed symmetrical dipole circuit boards are orthogonally arranged on a grounding plane printed circuit board to form an orthogonal polarization antenna. The bottom layer of each printed symmetrical dipole circuit boardsis a downdip symmetrical dipole, and the top layer is a microstrip balun. The top layer of the grounding plane printed circuit board is a grounding plane, and the bottom layer is provided with an antenna feed network. The satellite navigation antenna uses the printed symmetrical dipoles as antenna radiation units, and has the advantages of light weight and low cost.

The invention relates to the field of double-frequency antennas, particularly to a double-frequency omnidirectional dipole antenna, and solves the problems of double-frequency bandwidth and out-of-roundness and efficiency of an omnidirectional directional diagram of an antenna horizontal plane in the prior art. The antenna comprises a microwave dielectric substrate, which comprises an edge gap anda feed gap and is of a bilateral symmetry structure, wherein the left and right planes are divided into fixed area areas, metal patches are symmetrically arranged on the left and right planes, the antenna has a high-frequency-band working frequency band and a low-frequency-band working frequency band, the absolute value of S11 of the low frequency band is smaller than -10 dB, the impedance bandwidth is 4.1%, namely 2.4 GHz to 2.5 GHz, the absolute value of S11 of the high-frequency band is smaller than -10dB, and the impedance bandwidth is 18%, namely 5GHz-6GHz. The dual-frequency omnidirectional dipole antenna disclosed by the invention is in horizontal omnidirectional radiation, the dual-frequency bandwidth and the out-of-roundness and efficiency of an omnidirectional directional diagram of the horizontal plane of the antenna are effectively improved, the structure is simple, and the production and maintenance costs are reduced.

The invention provides a broadband vertical polarization omnidirectional array antenna with an adjustable unit number. The antenna comprises an omnidirectional transmission array and a power divider,wherein the omnidirectional transmission array and the power divider are perpendicular to each other and are connected through a metal wire, the omnidirectional transmission array is a cylindrical transmission array formed by uniformly distributing N identical directional transmission arrays along the central axis of the omnidirectional transmission array, and each directional transmission array is formed by vertically arranging eight eight-mesh antenna units which are further connected through a one-to-eight combined power divider. The antenna is advantaged in that the antenna is arranged onfixed or mobile wireless communication equipment through equipment, can be used for mutual communication in a mobile communication system, a future vehicle-mounted navigation system, an unmanned aerial vehicle system and other communication systems, and has advantages of wide band, high gain, excellent out-of-roundness, easiness in processing, low cost, simple structure and the like.

The invention relates to an implementation method of a high-gain omnidirectional biconical antenna array. The implementation method is mainly used for improving the omnidirectional degree of an omnidirectional antenna in a broadband range and acquiring a pitching wave beam with good in-band consistency at the same time. The high-gain omnidirectional biconical antenna array is composed of a plurality of cylindrical loading special-shaped sleeve biconical antenna units arrayed by pitching surfaces and an array feeder, wherein the top of a cone of each sleeve biconical antenna unit is provided with a cylindrical load so as to improve an in-band voltage standing wave ratio; each array unit is directly excited through a coaxial line, an inner conductor of the coaxial line is connected with an upper half cone of the unit, and an outer conductor is connected with a lower half cone; one upper biconical antenna feed coaxial line passes through the inner conductor of one lower unit feed coaxial line in sequence to form a nested coaxial line, and feed structures do not interfere with each other; and the nested coaxial line is converted into an independent feed connector through a coaxial ridge waveguide conversion pair below the coaxial line. The method is suitable for design and implementation of the high-gain omnidirectional biconical antenna array.

A satellite-navigation anti-interference microstrip array antenna provided in the invention adopts triangular Y-shaped slot microstrip array elements. By using the antenna, miniaturization of the antenna array can be realized, cross coupling among array elements is effectively overcome and an anti-interference capability is increased. The antenna comprises N microstrip antenna array elements, a medium substrate and a metal reflection base plate. The microstrip antenna array elements are arranged on an upper surface of the medium substrate according to a certain interval. The metal reflection base plate is arranged on a lower surface of the medium substrate. Each microstrip antenna array element comprises a triangle metal radiant panel. The triangle metal radiant panel is provided with a Y-shaped slot. The Y-shaped slot comprises three bar-type slotting. Initiating terminals of the three bar-type slotting are intersected and converged and tail terminals are pointed to three edges of a triangle respectively. The triangular Y-shaped slot microstrip array elements are used for controlling flowing of a surface current and radiating a circular polarized wave. An edge of each bar-type slotting of the Y-shaped slot is provided with a coaxial feed point used for feeding in an electromagnetic wave signal.