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.

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.