38results about How to "Beam width" patented technology

The invention discloses a multimode satellite navigation terminal antenna with broadband and circular polarization wide-beam, which is applied in places with higher demands on the properties of the broadband and the circular polarization. The multimode satellite navigation terminal antenna is composed of an antenna body and a feed network, wherein, the antenna body consists of a radome (1), a media support, a metallic radiating patch (2), four L-shaped metallic feed probes (3) and a metallic reflecting plate (4); the feed network consists of a four-way microstrip power-dividing phase shift network (5) and a metallic shielding box; the four L-shaped metallic feed probes (3) of the antenna body are electrically connected with the microstrip power-dividing phase shift network (5) of the feed network by metals. The multimode satellite navigation terminal antenna with broadband and circular polarization wide-beam leads the relative bandwidth of the microstrip antenna to reach a point above 40 percent. Meanwhile, since the microstrip antenna with nested media is adopted, the low-elevation gain of the microstrip antenna is greatly improved. With a 5-degree elevation angle gain larger than -5dBi, the multimode satellite navigation terminal antenna with broadband and circular polarization wide-beam is also provided with excellent mechanical characteristics and temperature characteristics.

Disclosed is a beam monitor system in which signals outputted from a plurality of wires are divided in a multi-wire type monitor for measuring a beam profile of a charged particle beam, an identical number of the wires are grouped, the signals of the respective groups are taken out one piece by one piece to be connected with each other, and the number of the pieces, corresponding to a number of the wires belonging to the one group, are put together to be connected to a signal processor storing connection information.

The invention discloses a broadband wide-beam rectangular monopole antenna and relates to an onboard antenna with broadband wide-beam features. The monopole antenna comprises a rectangular pasting piece printed on a dielectric substrate, a coplanar waveguide and an edge gradual-change structure floor. Feeding is carried out in a coplanar waveguide mode. Radiation loss is lowered. The lower end of the rectangular conductor pasting piece is subjected to smoothing processing. Impedance matching is optimized. A groove is formed in the bottom of the pasting piece. The edge gradual-change structure floor is designed, and an antenna beam can be effectively widened. The antenna has the advantages of being small in size, simple in structure, convenient to machine, wide in beam, easy to integrate and the like, in a broadband, the width of the 1.5 dB beam of the antenna in a vertical face reaches 120 degrees, all-direction scanning is carried out in a horizontal plane, impedance bandwidth is 7.1 GHz-12.8 GHz, the maximum gain can reach 3.8 dB, the radiation features are stable, the requirement for the performance index of the onboard antenna is met, and the monopole antenna is suitable for being used as a conformal unit of the onboard antenna.

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.

An adjustable aerodynamic lens system for aerodynamic focusing of aerosols comprises a hollow tube having an inlet terminal, an outlet terminal and a focusing segment located between the inlet terminal and the outlet terminal. The focusing segment includes a plurality of section tubes assembled in a manner to selectively focus aerosols of a specific average size. Each of the section tubes has a focusing orifice, and the diameters of the two adjacent focusing orifices are different. In specific, the section tubes having their focusing orifices of appropriate diameters are chosen according to the average size of aerosol particles to be focused, and assembled in sequence, so as to make aerosol fluid passing through to form a beam of aerosol particles with good focusing quality.

A space multi-target detection system and method, the method comprising: performing cross-correlation calculations on each of multiple receiving antenna signals; obtaining a brightness distribution function according to the cross-correlation calculation results, and realizing comprehensive aperture mapping of the observation area; using The observed data or predictive calculation realizes the suppression of the cosmic background noise in the synthetic aperture map; according to the observation data or the orbital mechanics model, corrects the image blur caused by the movement of the space object in the synthetic aperture map; judges by the threshold Realize the identification and direction estimation of multiple targets in the synthetic aperture image; for the selected target direction, realize the time delay and phase difference calculation of each antenna relative to the phase center, and perform time delay and phase adjustment; according to the time delay and phase The difference calculation value realizes the alignment of each antenna signal in the selected target direction; the signal value of each receiving antenna is added in the same direction to realize the observation of the signal source in the selected target direction.

The invention discloses a wide-beam multi-arm slot helical antenna, which is used to solve the problem of complex feed structure of the existing four-arm helical antenna. Including annular cylindrical dielectric substrate (1), annular conical dielectric substrate (2), annular cylindrical metal patch (3), annular conical metal patch (4), series-fed microstrip line (5), coaxial interface ( 6) and load resistor (7); the inner and outer surfaces of the annular columnar dielectric substrate (1) are respectively printed with a series-fed microstrip line (5) and an annular columnar metal patch (3). The series-fed microstrip line (5) N evenly distributed sector-shaped pieces (51) are provided on the annular columnar metal patch (3), and coupling adjustment gaps (31) corresponding to the sector-shaped pieces (51) are etched on the annular columnar metal patch (3); the outer surface of the annular cone-shaped dielectric substrate (2) An annular conical metal patch (4) printed with etched radiating spiral slits (41). The invention has the advantages of simple feed structure and wide beam, and can be used in fields such as communication and navigation.

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 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.