38results about How to "Beam width" patented technology

The invention discloses a wideband low sidelobe lens antenna based on novel artificial electromagnetic material. The antenna comprises a lens body with an axis in a same straight line, an impedance matching layer, and a feed source. A refractive index of the lens body shows gradient distribution along a radial direction, and a refractive index of the impedance matching layer shows uniform distribution along s axial direction. The lens body and the impedance matching layer are made from the novel artificial electromagnetic material. The new artificial electromagnetic material consists of basic units of periodic arrangements. In the invention, the wideband low sidelobe lens antenna based on the novel artificial electromagnetic material realizes, for a first time, simultaneously regulating an aperture field amplitude and phase distribution in a microwave band; a bandwidth of the lens antenna is quite wide; dispersion in a Ku band is not clear, and the performance is stable; the production is simple; the technology is mature; the price is not high; the promotion is easy; and structural parameters can be scaled to be suitable for different wave bands such as the microwave, millimeter wave and terahertz wave.

The invention relates to a space multi-target detection system and method. The method comprises the following steps: performing cross-correlation calculation on each of a plurality of receiving antenna signals; obtaining a brightness distribution function according to a cross-correlation calculation result and realizing comprehensive aperture mapping of an observed area; realizing the suppressionof cosmic background noise in the comprehensive aperture mapping by utilizing observed data or prediction calculation; correcting image blur caused by spatial target motion in the comprehensive aperture mapping according to the observed data or an orbital mechanics model; realizing the recognition and the direction estimation of multiple targets in the comprehensive aperture mapping through threshold value judgment; realizing calculation on time delay and phase difference of each of antennas relative to a phase center aiming at selected target direction and performing time delay and phase adjustment; realizing the alignment of each of the antenna signals in the selected target direction according to time delay and phase difference calculation values; performing co-directional addition on signal values of all the receiving antennas and realizing the observation of a signal source in the selected target direction.

The invention relates to a large-beam diameter ion source. The large-beam diameter ion source comprises a gas ionization device, an ion optical system and a neutralization device, wherein the gas ionization device is used for generating plasma, the ion optical system is used for extracting an ion beam from the plasma and accelerating the ion beam, the neutralization device is used for emitting electrons to the ion beam so as to generate a neutralization ion beam, the emission aperture of the large-beam diameter ion source is 100-200 millimeters, the ion optical system comprises a screen grid and an acceleration grid which are axially arranged on the same central line at intervals, a grid hole region with a grid hole is arranged at the middle part of the screen grid, and the aperture of the grid hole of the grid hole region is gradually increased towards the outside from a circle center of the grid hole region along a radial direction. In the large-beam diameter ion source, the screen grid with variable aperture is designed, so that the aperture of the screen grid is matched with plasma concentration distribution extracted by the screen grid, the same beam density is further extracted through different apertures to achieve the purpose of improving the beam uniformity, and the ion beam with wide beam and high directivity can be generated; and moreover, the effective beam diameter and the uniformity are large, and the beam stability is high.

The invention provides a satellite navigation circularly polarized microstrip antenna. A triangular Y-shaped groove microstrip radiation unit is adopted, which has the characteristics of high radiation efficiency, high low-elevation gain, wide band, wide wave beam and minimization, and is particularly suitable for receiving low-elevation satellite signals and increasing the center accuracy of an antenna phase. The satellite navigation circularly polarized microstrip antenna comprises a metal radiant panel, a dielectric substrate and a metal reflection bottom plate, wherein the metal radiant panel and the metal reflection bottom plate are arranged on the upper surface and the lower surface of the dielectric substrate respectively; the metal radiant panel is triangular; the triangular radiant panel is provided with a Y-shaped groove; the Y-shaped groove comprises three strip-shaped open grooves; the starting ends of the three strip-shaped open grooves converge in an intersecting way, and the tail ends point to the three edges of a triangle respectively; the triangular radiant panel provided with the Y-shaped groove is used for controlling surface current flow, and radiating circularly polarized waves; and the edges of the strip-shaped open grooves of the Y-shaped groove are provided with coaxial feeding points for feeding electromagnetic wave signals.

The invention discloses a micro-strip low-axial-ratio circularly-polarized antenna for aerial radiation field measurement. The micro-strip low-axial-ratio circularly-polarized antenna comprises a medium substrate. A plurality of circular slot units in central symmetry are formed in the front surface of the medium substrate through etching. The center of each circular slot unit is provided with a unit center rectangular groove. One side of each unit center rectangular groove is provided with one feed probe welding hole, and the feed probe welding hole adopts coaxial probe backward feed. The plurality of circular slot units are arrayed in a sequential rotation mode. The back surface of the medium substrate is provided with a copper-clad floor. The copper-clad floor is provided with grooves in the places corresponding to the circular slot units respectively; and the feed probe welding holes are arranged in the grooves respectively. The micro-strip low-axial-ratio circularly-polarized antenna improves circular polarization purity, realizes low-axial-ratio characteristics and is suitable for accurate measurement of an aerial microwave radiation field.

The antenna case with an air hole structure has excellent durability while lightweight and has improved electric characteristics of radio waves emitted from an antenna. The antenna case having the air hole structure includes a main body having a plurality of air holes and a pair of caps. The main body is formed into a tube shape to have the air hole structure, and both distal ends of the main body are opened. The pair of caps covers both opened portions of the main body, and includes an upper cap and a lower cap. The plurality of air holes formed in an internal portion of the main body reduce a weight of the main body, and improve electric characteristics of radio waves due to a dielectric constant of a resin. A conductor rod is inserted into the air holes, thereby improving a pattern of radio waves emitted from the antenna.

The invention discloses a ka-waveband dual-circular polarization switchable transceiving antenna which comprises an antenna radiation patch layer, an antenna feed layer, a TR assembly layer and probes. The antenna radiation patch layer comprises an antenna radiation patch dielectric layer, a slave radiation patch is arranged on the upper surface of the antenna radiation patch dielectric layer, a radiation metal ground layer is arranged on the lower surface of the antenna radiation patch dielectric layer, a main radiation patch is clamped in the middle of the antenna radiation patch dielectriclayer, and a coupling gap is formed in the radiation metal ground layer; the antenna feed layer comprises an antenna feed dielectric layer arranged under the radiation metal ground layer, a feed metalground layer is arranged on the lower surface of the antenna feed dielectric layer, and two T-shaped strip line feed structures are arranged in the antenna feed dielectric layer; the TR assembly layer comprises other radio frequency layers, a switching layer and a bottom microstrip layer. The probes comprise a first probe and a second probe. The phased array multilayer microwave plate dual circularly polarized antenna is formed by arranging the antenna radiation patch layer, the antenna feed layer and the TR assembly layer, and has the characteristics of broadband and wide beam.

The invention discloses a multi-channel pulse Doppler radar capable of detecting an underwater sound source in a cross-medium manner, which relates to the field of radar detection. The radar comprises a multi-beam parabolic cylinder antenna module, a transceiving module, a signal processing module and a data processing module; wherein the receiving and transmitting module is used for receiving a target echo signal or transmitting a transmitting signal to a parabolic cylinder reflector of the multi-beam parabolic cylinder antenna module; the data processing module is used for completing radar control, data communication and echo display; and the signal processing module is used for processing different radial speeds of sea wave clutters and water surface micro-motion signals relative to the radar detection direction. The method comprises the following steps: extracting a signal of which the Doppler frequency is not zero from a target echo signal, namely a water surface micro-motion signal, so as to effectively distinguish sea wave clutters and target echoes; therefore, a technical foundation is laid for cross-medium detection of underwater sound sources by adopting water surface and air radars, so that cross-medium communication becomes possible.

The invention provides a lighting device and a projection device. The lighting device is composed of a light source, a light homogenizer, an illumination lens, a polarizing beam-splitter (PBS), and asilicon-based liquid crystal LCoS. The light homogenizer is arranged between the light source and the illumination lens. With the light homogenizer, large-angle-range illumination light is provided for each pixel on LCos, so that the light beam projected by the projection eye lens is widened and thus the pupil of the human eye is covered by the full field of view.

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.

The invention discloses a full-polarization rectification antenna with a broadband wide power range and an energy transmission system. The full-polarization rectification antenna comprises a receiving antenna and a rectification circuit; the receiving antenna is a broadband wide-beam dual-polarization antenna and comprises a floor and a feed coaxial line; one side of the floor is provided with a metal wall and a radiator; the metal wall is arranged around the radiating body, and the feed coaxial line is connected with the radiating body and an input port of the rectifying circuit respectively; and the rectifying circuit is a double-input rectifying circuit with a wide broadband power range and is printed on the other surface of the floor. The antenna can be used for broadband microwave wireless energy collection, and has the advantages that the circuit matching performance can be improved in a broadband wide power range, the circuit efficiency is improved, and the conversion from unbalance to balance of power can be realized; after the antenna is combined with a dual-polarization receiving antenna, stable rectification efficiency can be maintained under the condition of different incident polarization rotation angles.

The invention belongs to the technical field of antenna design, and particularly relates to an L-band broom-shaped antenna. The antenna comprises a ridge waveguide feed source (1), a feed source reflection cavity transition structure (2) and a parabolic reflection cavity (3), wherein a ridge-shaped metal sheet extending along a broadside wave band wall is arranged in the ridge waveguide feed source (1); the feed source reflection cavity transition structure (2) is arranged at an outlet of the ridge waveguide feed source (1) and extends in a horn mouth shape, and smooth transition between the feed source reflection cavity transition structure (2) and the parabolic reflection cavity (3) is achieved. The parabolic reflection cavity (3) comprises a parabolic reflection cavity surface (31) and a radiation outlet (32) opposite to the parabolic reflection cavity surface, and beam reflection is carried out through the parabolic reflection cavity surface (31). The antenna has the advantages of wide directional diagram azimuth plane wave beam, narrow pitching plane wave beam, low side lobe level, high wave beam phase flatness and the like, the use requirement and the performance requirement of aircraft target near-field scattering characteristic detection on the measurement antenna are met, and the performance and the test efficiency of a test system are improved.

The invention relates to a Beidou pole-rod buoy antenna. The Beidou pole-rod buoy antenna comprises a plurality of antenna units which are overlaid together to form a pole-shaped structure, the antenna units comprise dielectric cylinder bodies and feed network circuit boards positioned on the bottoms of the dielectric cylinder bodies; a plurality of helical arms are arranged on the peripheries of the dielectric cylinder bodies at intervals; a short-circuit branch knot and a feed point are arranged at a lower end of each helical arm; the feed network circuit boards are provided with ground plates and micro-strip feed lines; the short-circuit branch knots at the lower ends of the helical arms are welded together with the ground plates on the feed network circuit boards; and the feed points at the lower ends of the helical arms are welded together with the micro-strip feed lines on the feed network circuit boards. The Beidou pole-rod buoy antenna has the characteristics of wide wave beam, low power consumption, light weight and the like, is stable and reliable in working, and is high in integral radiation performance, so that the problems of large weight and narrow wave beam existing in the conventional buoy terminal antenna are solved.