36results about How to "Improve cross polarization" patented technology

A multiple mode feed horn is provided for transmitting and receiving signals. The feed horn includes a transverse electric throat section, a transverse electric profile section, and a transverse electric aperture section. The transverse electric profile section propagates a first transverse electric (TE) mode. The transverse electric aperture section propagates a second TE mode. The multiple mode feed horn prevents propagation of traverse magnetic modes from said throat section to said aperture section.

A ball (1) for use in a sporting activity can comprise a body having an electrical circuit (21) on a flexible substrate (20) received therein. The electrical circuit (21) comprises a dipole antenna (26) integrally formed with the electrical circuit (21) on the flexible substrate (20). The dipole antenna can comprise two arms (23, 24) each folded in a semi-circular shape.

The embodiment of the invention discloses a dual-polarization array antenna unit. The dual-polarization array antenna unit comprises a plurality of radiation units, a first polarization feed network and a second polarization feed network, wherein the first polarization feed network and the second polarization feed network are correspondingly connected with the radiation units respectively. A plurality of feed ports, connected the radiation units, of the first polarization feed network are first feed ports and a plurality of feed ports, connected with the radiation units, of the second polarization feed network are second feed ports, wherein the adjacent first feed ports are connected in a constant-amplitude same-phase feed mode and the adjacent second feed ports are connected in a constant-amplitude reverse-phase feed mode. The embodiment of the invention further discloses a low-profile high-isolation MIMO antenna composed of the dual-polarization array antenna unit. The dual-polarization array antenna unit and the low-profile high-isolation MIMO antenna have the advantages that the overall peripheral size can be effectively reduced, the manufacturing technology is simple and cross polarization and isolation can be effectively improved.

The invention provides a multi-beam antenna comprising a reflection plate, three or more columns of parallel low-frequency arrays fixed on the reflection plate, and frequency selection surfaces arranged on all axes of the low-frequency arrays or/and arranged at the two sides along the extending directions of the low-frequency arrays. Low-frequency radiating units of each two columns of low-frequency arrays are staggered. Therefore, on the premise that the miniaturization is guaranteed, the isolation and cross polarization between the low-frequency radiating units are improved and the performances of the antenna are enhanced; and objectives of simple structure and low cost are achieved.

The invention discloses a differential Quasi-Yagi antenna with a filtering function. The differential Quasi-Yagi antenna with the filtering function comprises a substrate, wherein the substrate comprises an upper layer, a lower layer and a middle layer, the upper layer and the lower layer are both formed by microwave medium chips, and the middle layer is formed by prepregs. The differential Quasi-Yagi antenna with the filtering function further comprises a director (11), a radiating element (12), a reflector (13), a filter (14) and a transition structure (15). The differential Quasi-Yagi antenna with the filtering function has the advantages that the filtering function and the radiating function are integrated on the premise that the original size of the antenna is not increased, the structure is compact, cross polarization performance is high, and loss is low.

The invention provides an anti-radiation anticorrosive coating and a preparation method thereof. Melamine formaldehyde resin and arachidonic acid modified epoxy resin are used as film-forming substances, organic modified nano powder is used as an auxiliary material, the organic modified nano powder is prepared by mixing three-dimensional flower-like cobaltosic oxide and spiral carbon nanofibers toreact to obtain nano powder, and loading polyaniline on the surface of the nano powder to obtain the anti-radiation anticorrosive coating. And the obtained coating product has excellent radiation resistance and corrosion resistance, and is particularly suitable for related products of electrical equipment.

The invention discloses a high-gain automobile millimeter wave radar array antenna. The high-gain automobile millimeter wave radar array antenna comprises a millimeter wave radar chip interface, a first receiving linear array antenna, a second receiving linear array antenna, a third receiving linear array antenna, a fourth receiving linear array antenna, a transceiving isolation linear array antenna, a first transmitting linear array antenna, a second transmitting linear array antenna, a third transmitting linear array antenna and a fourth transmitting linear array antenna. The core architecture of the high-gain automobile millimeter wave radar array antenna adopts a four-transmitting and four-receiving antenna array mode, adopts eight angle-feed array elements with same phase and same amplitude as a transmitting unit, and combines a combination method of tangential circular polarization and surface slotting of a symmetrical structure to reasonably suppress the sidelobe level of the antenna, control the size and the position of an antenna parasitic unit, optimize the radiation characteristic of the antenna and improve the impedance matching characteristic. The high-gain automobilemillimeter wave radar array antenna has the advantages of high precision, high response speed, high resolution, high stability, miniaturization and low cost, and can be used for medium-distance and long-distance detection millimeter wave radar system schemes.

The invention relates to a small compass B1 frequency band micro-strip center-fed antenna. The antenna comprises a metal radiation unit, a dielectric substrate, a ground plane, a feed port and a probe; the metal radiation unit is installed on the upper surface of the dielectric substrate, the ground plane is installed on the lower surface of the dielectric substrate, the feed port is installed onthe lower surface of the ground plane, feed points are arranged in the metal radiation unit, the dielectric substrate and the ground plane, the probe is connected with the metal radiation unit throughthe feed port, and a probe feed circuit is formed; the metal radiation unit comprises a corner square metal patch, a U-shaped resonant tank is formed in the middle of the corner square metal patch, the center of the U-shaped resonant tank is consistent with the center of the corner square metal patch, the probe is located in the center of the corner square metal patch. Accordingly, the B1 frequency band of a compass system can be completely covered, the structure is simple, the return loss is low, arraying is conducted easily, and due to the fact that the center feed structure is introduced,the antenna obtains low cross polarization and high axial ratio beam width.

The invention discloses a dual-polarized broadband antenna array with a high-isolation suspended microstrip line for balanced feeding. The antenna array mainly comprises an antenna body and a feed network for feeding the antenna body, the antenna body is formed by arranging a plurality of antenna units. The antenna unit comprises an upper dielectric plate, a middle dielectric plate, a lower dielectric plate, a first polarization coaxial probe and a second polarization coaxial probe. A radiation patch is printed on the upper surface of the upper dielectric plate and is connected with the firstpolarization coaxial probe and the second polarization coaxial probe, and a grounding reflection plate is printed on the lower surface of the lower dielectric plate. Compared with the prior art, the dual-polarized broadband antenna array has the advantages of high isolation, the high gain and the wide impedance bandwidth.

The invention discloses an array antenna for an automobile radar sensor, and the array antenna comprises a millimeter wave receiving and transmitting chip bonding pad, a first receiving linear antennaarray, a second receiving linear antenna array, a third receiving linear antenna array, a fourth receiving linear antenna array, a first transmitting linear antenna array, a second transmitting linear antenna array, and a third transmitting linear antenna array. The core architecture of the array antenna adopts a three-transmitting four-receiving antenna array mode, and adopts ten in-phase non-equal amplitude angle feed array elements as a basic unit structure to control the size and position of an antenna parasitic unit, reasonably suppress the sidelobe level of the antenna and optimize theradiation characteristics of the antenna. The impedance matching characteristic is improved by combining a combination method of tangential circular polarization and surface slotting of a symmetricalstructure . According to the scheme, high precision, high response speed and high resolution can be achieved, and a millimeter wave radar system scheme for medium-distance and long-distance detectioncan be achieved.

The invention discloses a millimeter wave radar array antenna which a one-to-twelve input power division matching network and first to twelfth angular feeder arrays. The core architecture of the invention adopts an in-phase non-equal amplitude angle feed ten-element structure, and a corner cut circular polarization method of a symmetrical structure and a combination method of surface slotting arecombined to control the size and position of an antenna parasitic unit, the antenna sidelobe level is reasonably suppressed and the radiation characteristics of the antenna is optimized. Meanwhile, amultilayer substrate design structure and a TSV interconnection technology are utilized, the signal interference of an antenna feeder structure on an antenna resonance unit is reasonably avoided, thedielectric loss is reduced, the radar detection sensitivity and overall detection performance are improved, and circuit integration and equipment miniaturization are facilitated.

The embodiment of the invention discloses a dual-linear polarization feed source horn. The horn comprises a dual-groove corrugated horn unit, a square-to-circle transition waveguide and a quadrature coupler unit which are connected in sequence; the double-groove corrugated horn unit comprises a transmission waveguide and a double-groove feed source horn; the transmission waveguide is connected with the square-to-circle transition waveguide and the double-groove feed source horn; the quadrature coupler unit comprises a first input interface, a second input interface, a first Chebyshev transition waveguide connected with the first input interface, a first turning waveguide connected with the first Chebyshev transition waveguide through a first T-shaped junction, and a second Chebyshev transition waveguide connected with the second input interface. The second turning waveguide is connected with the second Chebyshev transition waveguide through a second T-shaped junction; and the first turning waveguide and the second turning waveguide are connected with the square-round transition waveguide through a cross rotary junction. The dual-linear polarization feed source horn is simple in structure, small in size and wide in working bandwidth, and has good cross polarization performance.

The invention discloses a miniaturized 5G base station antenna. The base station antenna includes a base plate, a plurality of radiation units fixed on the base plate and spaced apart from each other, a feeding post installed on the base plate for feeding power, and a base plate arranged on the base plate. And electrically connect the feeding column and the feeding network of each radiation unit. The height of the base station antenna of the invention is relatively low, which saves the overall space of the antenna and reduces the cost; the cross polarization is better and the gain is higher.

The invention relates to the technical field of antennas, in particular to a millimeter wave broadband corrugated horn and a manufacturing method thereof. The millimeter wave broadband corrugated horncomprises a circular waveguide, a variable-mode section, a variable-angle section and a radiation section. The circular waveguide is a first optical wall waveguide, one end of the circular waveguideis a feed source input end, and the other end of the circular waveguide is connected with the inner wall of the variable-mode section. The variable mode section is composed of a second optical wall waveguide and a plurality of periodic ripple structures with gradually changed second ripple grooves. The variable-angle section is composed of a third light wall waveguide which is linearly opened anda plurality of periodic third corrugated groove structures, the radiation section is composed of a fourth light wall waveguide which is linearly opened and a plurality of periodic fourth corrugated groove structures, and the diameter of the inner wall of the variable-mode section is the same as that of the inner wall of the circular waveguide. According to the millimeter wave broadband corrugatedhorn provided by the invention, the transition section with the most common groove depth change is adopted to realize the transition from the optical wall waveguide to the corrugated waveguide.