76results about How to "Simple feeding" patented technology

The invention discloses a broadband dual polarized antenna unit, which comprises a radiator and a balanced feeding device, wherein the radiator consists of four radiation fins which are symmetric in pairs and are orthogonally distributed; the balanced feeding device consists of an excitation core wire and a balanced balun; the balanced balun is simultaneously formed into a support of each radiation fin; a symmetric radiation array is as long as a half of wavelength and is as wide as a quarter of the wavelength; each radiation fin further comprises a supporting area and a radiation area which are mutually adjacent; the two short sides and long sides of the radiation area and the two waists of the supporting area form a continuous curve; the ratio of the waist length of the supporting area to the length of the short side of the radiation area to the length of the long side of the radiation area is 1:1:2; and the two waists of each of the two adjacent radiation fins are arranged in parallel and are at an interval less than 0.1 wavelengths. The dual polarized antenna unit is a radiation oscillator which is relatively wider than the broadband and has good indexes, such as a standing-wave ratio and the like in a relatively wider bandwidth.

The invention relates to a flat plate reflective array antenna which comprises the following components: a metallic bottom plate, a dielectric plate, a polarized grid plate, wave absorbing material surrounding edges, an antenna cover and a feed source, wherein the dielectric plate is installed on the top of the metallic bottom plate and is parallel with the metallic bottom plate; the polarized grid plate is supported on the dielectric plate through a supporting pillar, is parallel with the dielectric plate and the metallic bottom plate, and has a certain distance to the dielectric plate and the metallic bottom plate; the wave absorbing material surrounding edges are installed at the periphery of the metallic bottom plate so as to surround the dielectric plate and the polarized grid plate;the antenna cover is buckled with the metallic bottom plate so as to surround the dielectric plate, the polarized grid plate and the wave absorbing material surrounding edges; and the feed source is installed at the center of the bottom of the metallic bottom plate and passes through the metallic bottom plate and the dielectric plate. The antenna has the advantages of simple feeding, high gain, good directional diagram envelope, wide frequency band, small volume, light weight, easy installation and the like, and can be used for the fields of microwave communication, satellite communication and the like.

A high-gain low-profile null feed array antenna comprises a metal cover plate, a metal side plate, a metal bottom plate and a feed source. The metal cover plate locates at the upper part, the metal bottom plate locates at the lower part and the metal side plate locates at the middle part; the metal cover plate, the metal bottom plate and the metal side plate are connected with each other to form a cavity in which the feed source is arranged; the metal cover plate is a metal flat plate which is provided with a group of gap units arranged periodically; the feed source comprises a feeding patch located in the middle of the housing and a group of passive parasitized patches around; the feeding patch and the parasitized patch are printed on the upper surface of a same dielectric substrate; the lower surface of the dielectric substrate is attached on the upper surface of the metal bottom plate; and the feeding patch is activated by a cable through a radio frequency coaxial joint. The antenna has the advantages of simple feeding, high gain of more than 20dBi, high caliber efficiency of more than 60 percent and low cost.

The invention discloses a substrate integrated waveguide sinusoidally modulated leaky wave antenna, which aims at providing a simple power feeding, and u -1 order harmonic wave radiation utilizing leaky wave antenna. The invention is realized by the following technical scheme: A metal radiation patch array is arrange at that center of the upper surface of the antenna dielectric plate, a cop clad sheet sandwiched on the interface surface of the waveguide dielectric plate and the antenna dielectric plate is formed with a rectangular slot array corresponding to the metal radiation patch array, and the rectangular slot array couples electromagnetic energy from the waveguide to the metal radiation patch array above the antenna dielectric plate to realize linear polarization radiation; A lineararray metallize shielding via through that waveguide dielectric plate is for on both sides of the rectangular slot array from top to bottom, and a metal coupling probe through the waveguide dielectricplate is arranged on the inn sides of the contracted linear array at both ends of the linear array metallized shielding via; A sinusoidally modulated leaky wave antenna with field intensity on the plane of antenna dielectric plate is realized by exciting the substrate integrated waveguide with metal-coupled probes and U-shaped slots on the copper clad substrate.

The invention belongs to the technical field of microwaves and relates to a broadband circularly-polarized antenna for a handheld through-wall radar. The broadband circularly-polarized antenna sequentially comprises a radome 1, an upper patch layer 2, a PMI foam layer 3, a lower patch layer 4, a first dielectric layer 5, a coupling slot layer 6, a second dielectric layer 7, a feed microstrip 8 anda metal back cavity 9 from top to bottom, wherein a hollowed-out slot 61 is formed in the coupling slot layer 6; the shape of the feed microstrip 8 is a combined shape of a rectangle and a sector; and the metal back cavity 9 is a rectangular cavity with an open surface at one end and the open surface is toward the feed microstrip. According to the broadband circularly-polarized antenna, the technologies, such as slot-coupling feeding, a low-dielectric constant layer, laminated microstrip-coupled patches and a reflecting back cavity are comprehensively adopted, so that the antenna reaches theimpedance and beam bandwidth of over 30% under low profile requirements. The target of double-patch coupling resonance is achieved through tuning the transverse dimensions of upper and lower patches,and circular polarization is achieved by adopting the cutting angle design of the rectangular patches.

The invention discloses a low-profile broadband wide-angle tight coupling antenna unit and array, and belongs to the technical field of radar and communication. The antenna unit comprises a wide-anglematching layer, a coupling layer, an antenna layer and a feed layer, wherein the whole structure is processed by adopting a multi-layer printed board process. The antenna array is formed by arrangingantenna units according to a specified unit spacing rule. According to the antenna unit, a multi-layer printed board processing technology is adopted, so that the assembling and welding difficulty ofthe tightly coupled antenna array in the later period is greatly reduced, and the reliability of the antenna array is also improved; and the antenna array adopts a microstrip line aperture coupling feed structure, so that the design of a broadband balun of a traditional dipole tight coupling array antenna is omitted, and the design difficulty of the tight coupling array antenna is greatly simplified.

The invention provides a fractal structure-based dual-band circularly polarized antenna, which comprises an upper dielectric slab, an upper radiation paster, a lower dielectric slab, a lower radiation paster, a support column, an air layer and a bottom feeder line. The upper radiation patch is a Sierpinski third-order fractal structure. The lower-layer radiation paster is provided with a hollow structure. The miniaturization requirement of the actual application of the antenna can be met. Not only the double-frequency working requirements of a current communication system can be met, but also the anti-interference requirements of circularly polarized waves during the wireless wave antenna transmission process of the antenna can be met. The difference between two working frequency bands is larger, so that the two working frequency bands are less likely to be interfered by each other. The antenna is designed to be of a fractal structure, so that the bandwidth of the antenna is improved, wherein the circularly polarized bandwidth is at least larger than 200 MHz. A graded structure is adopted by the antenna for the generation of circularly polarized waves, so that the structure is simpler. The feed is simple and compact. By adopting the micro-strip line feed manner, the antenna is suitable for antenna installation and assembly. Compared with the conventional coaxial feed-point feeding manner and the multi-feed-point feeding manner, the feeding manner of the above antenna is greatly simplified.

The present invention discloses an L-shaped probe feeding broadband circularly polarized patch antenna. The antenna comprises two circular patches of the same structure, and an L-shaped probe. One patch rotates by 90 degree with the probe as a center point on a horizontal plane relative to another patch. Each patch is provided with two back-to-back notches. The two notches form diagonal perturbation. The L-shaped probe is coupled with the two patches and performs orthogonal feeding on the two patches. Due to adoption of the foregoing structure, under the condition of broad 3-dB axis ratio and impedance matched bandwidth, each patch uses a direct feeding manner, a power-diving phase shift network is not needed, and the antenna is realized by using multi-layer circuit technologies like LTCC and multi-layer PCB, and is convenient to integrate.

The invention discloses a millimeter wave multi-beam antenna for positioning. The millimeter wave multi-beam antenna comprises a main reflection surface and an auxiliary reflection surface which are parallel and coaxial with each other. The auxiliary reflection surface is connected to the main reflection surface via an assembling device. The assembling device can make the auxiliary reflection surface fixed relative to the main reflection surface, and can make the auxiliary reflection surface move coaxially relative to the main reflection surface in a direction perpendicular to the main reflection surface. The millimeter wave multi-beam antenna further comprises a feed source array and a feed network. The aperture surface of the feed source array and the virtual focus of the auxiliary reflection surface are on the same plane in parallel to the main reflection surface. A compact high-gain multi-beam antenna is achieved through a double-reflection structure and the feed source array, effectively increases the field of view coverage and improves positioning sensitivity.

A sum-difference beam antenna with asymmetric double artificial surface plasmon is composed of a dielectric substrate (1), and a transition section (2) from a coplanar waveguide to the artificial surface plasmon, an upper artificial surface plasmon (31) and a lower artificial surface plasmon (32) which are on the dielectric substrate (1). Metal conductors (4) are arranged on the two surfaces of the dielectric substrate (1), are symmetrically distributed on the two surfaces of the dielectric substrate (1) and are connected through metallized via holes (5), the upper artificial surface plasmon (31) and the lower artificial surface plasmon (32) share one common side edge (30) but have different dispersion characteristics, and two different modes are transmitted. When the end-fire direction isat different frequencies, the sum wave beams and the difference wave beams are alternately presented, and when the frequency varies between the frequency of the sum beam and the frequency of the difference beam, the beam direction scans around the end-fire direction. The antenna has the characteristic of simple feeding while realizing the sum-difference wave beams, and the feeding loss is reduced.

The invention discloses a multi-band dielectric resonance cell phone terminal antenna; the multi-band dielectric resonance cell phone terminal antenna comprises a rectangular ceramic dielectric medium (3) with a groove and a high dielectric constant, a multi-branch monopole (4), a dielectric board (1), a feed microstrip line (2), a printed ground (5) and a via hole (6). The antenna structure is characterized in that the use of the multi-branch monopole excite the rectangular dielectric medium with high dielectric constant, the electric field distribution in the medium is changed to make the medium generate a multi-mode resonance, thus achieving the requirements of the multi-mode multi-band of the terminal antenna, meanwhile, the dielectric medium is added with a groove, thus the radiation area of the dielectric medium can be increased as well as effectively reducing the weight of the antenna, thereby improving the radiation efficiency of the antenna. The multi-band dielectric resonance cell phone terminal antenna is characterized in small size, light weight, simple structure, wide working band, and high radiation efficiency. The multi-band dielectric resonance cell phone terminal antenna is low in manufacturing cost, simple in structure, easy to machining and integrate, can simultaneously meet the communication standards of 2G, 3G and 4G; and the multi-band dielectric resonance cell phone terminal antenna has a good popularization and application foreground.

The invention discloses a high-gain smoothing antenna which comprises a resonant cavity and at least one feed source placed in the resonant cavity. The resonant cavity is provided with a metal reflection plate, a metal enclosing frame and a metal grid. The metal reflection plate is used for fixing the feed source, the metal enclosing frame is erected on the reflection plate and the metal grid is used for covering the metal enclosing frame and provided with through holes used for outward irradiation of feed source signals. The feed source is a circular waveguide, or a square waveguide, or a rectangular waveguide or a loudspeaker. Through the mode, the high-gain smoothing antenna can integrate smoothing and gaining and meanwhile has the advantages of being easy to feed, high in gaining and the like.

The invention provides a method for generating omni-directional circularly polarized vortex electromagnetic waves, and solves the technical problems that in the prior art, omni-directional vortex electromagnetic waves are low in gain, and circular polarization is difficult to achieve. The implementation process comprises the following steps of: designing the lens shape of a cylindrical metasurfacelens component; setting parameters of the lens component; calculating expected vortex electromagnetic wave phase distribution and metal layer geometric rotation angle distribution of the initial model; establishing a lens component initial model and performing full-wave simulation; calculating convergence phase distribution and metal layer geometric rotation angle distribution of a final model; and obtaining a final model of the lens component, and carrying out full-wave simulation verification on the final model. A planar metasurface lens formed by periodically arranging transmission unit structures is conformal to a cylindrical surface to form a cylindrical metasurface lens component. The method for generating omni-directional circularly polarized vortex electromagnetic waves has the advantages of the relatively high gain, the relatively high circular polarization purity and the simple feeding, and can be applied to the field of communication.

The invention discloses a single-feed circular slit loading broadband circular polarization microstrip antenna, relates to an antenna, and specifically relates to a single-feed circular slit loading broadband circular polarization microstrip antenna, for solving the problems in the prior art that a conventional single-feed antenna has quite small bandwidth and cannot meet realistic needs. The antenna comprises an upper-layer medium substrate, a lower-layer medium substrate, a metal floor, a short-circuit probe, a feed probe, a feed small patch, a short-circuit small patch and a radiation patch. The upper-layer medium substrate and the lower-layer medium substrate are successively arranged side by side in parallel from top to bottom, the metal floor is printed at the upper surface of the lower-layer medium substrate, the radiation patch covers the upper surface of the upper-layer medium substrate, and the short-circuit probe and the feed probe are vertically arranged side by side between the upper-layer medium substrate and the lower-layer medium substrate. The antenna provided by the invention is applied to the field of wireless communication.

The present invention relates to a gamma-butenolide whose four positions contain aryl substituent and its solid phase synthesis method. Said invention provides the structure formula of said compound.

The invention discloses a synthesizing method of N, N'-diisopropyl thiourea, which comprises the following steps: adopting water as reacting solvent and 2-10% PEG-400 as catalyst; reacting thiourea and diisopropylamine with molar rate at 0.4-0.6: 1 under normal pressure to reflux for 20-36h; filtering; washing; separating to obtain the product.

The invention provides a method for industrial preparation of 6-methyl-3-aminopyridazine. The method comprises the following steps: 6-methyl-3-chloropyridazine is taken as the raw material, and subject to ammoniation with strong aqua ammonia, and the product is purified by recrystallization using water to obtain 6-methyl-3-aminopyridazine and a byproduct 6-methyl-pyridazine-3-ketone; and the byproduct 6-methyl-pyridazine-3-ketone is subject to chlorination with phosphorus oxychloride to generate 6-methyl-3-chloropyridazine. The method is simple in process, few in steps and high in yield, and as the byproduct can be regenerated into the reaction raw material, the production cost is reduced.

The invention discloses a dual-frequency circularly polarized Beidou antenna with wide-axis ratio beam, comprises an upper layer dielectric substrate and a lower layer dielectric substrate, The upperand lower surfaces of the upper dielectric substrate are respectively provided with an upper metal patch and a lower metal patch, the lower surface of the lower dielectric substrate is provided with ametal ground, the upper metal patch is loaded with a rectangular gap, a C-shaped branch and a rectangular branch, and the lower metal patch is loaded with two rectangular gaps and two isosceles triangular tangent angles. On the basis of the dual-frequency circular polarization characteristic, the invention has the advantages of wide axis ratio beam, low cost and easy machining, and can be well applied to the Beidou satellite navigation terminal equipment.

The invention discloses a leaky-wave antenna for improving radiation efficiency and a design method of a leaky-wave antenna. The leaky-wave antenna comprises a power divider and an antenna array. First leaky-wave antennas having periodic structures and second leaky-wave antennas having periodic structures are arranged at intervals to form the antenna array. The first leaky-wave antennas are different from the second leaky-wave antennas; and the radiation directions of the first leaky-wave antennas are identical with those of the second leaky-wave antennas. A certain first leaky-wave antenna or second leaky-wave antenna in the antenna array feeds external energy and carries out radiation; and the other end feeds the rest of energy after radiation into adjacent leaky-wave antennas at two sides respectively by the power divider. The first leaky-wave antenna or second leaky-wave antenna feeding the external energy carries out radiation respectively towards the leaky-wave antennas at directions of two sides and feeds the rest of energy after radiation into the adjacent leaky-wave antennas without feeding until the radiation efficiency meets a design requirement or radiation of the leaky-wave antennas at the outermost side of the antenna array have done. Therefore, the radiation efficiency of the leaky-wave antenna is improved.