45results about How to "Improve axle ratio" patented technology

The present invention provides a dielectric resonator antenna comprising: a dielectric resonator; a ground plane, operatively coupled with the dielectric resonator, the ground plane having four slots; and a substrate, operatively coupled to the ground plane, having a feeding network consisting of four microstrip lines; wherein the four slots are constructed and geometrically arranged to ensure proper circular polarization and coupling to the dielectric resonator; and wherein the antenna feeding network combines the four microstrip lines with a 90 degree phase difference to generate circular polarization over a wide frequency band.

First and second monopole conductive elements are disposed so as to be approximately mutually perpendicular and so that respective open ends are adjacent, and with respect to a straight line that passes between open ends of the first and second monopole conductive elements and through a center of a conductive ground plane, a first conductive ground plane portion formed on a first monopole conductive element-side of the straight line among the conductive ground plane and the first monopole conductive element are formed so as to be approximately symmetrical to a second conductive ground plane portion formed on a second monopole conductive element-side of the straight line among the conductive ground plane and the second monopole conductive element.

A polarization switching / variable directivity antenna according to the present invention includes a ground conductor plate 12 on a surface of a dielectric substrate 11, and has a radiation element 13, a directivity switching element 15, and polarization switching elements 16 provided on the ground conductor plate 12 side of the dielectric substrate 11. The radiation element 13 includes a first slot 17a formed by removing a loop-like portion from the ground conductor plate 12. The directivity switching element 15 includes a second slot 17b formed by removing a loop-like portion from the ground conductor plate 12 and directivity switching switches 18. The polarization switching elements 16 includes a third slot 17c formed by removing a linear-shaped portion from the ground conductor plate 12 and polarization switching switches 19a to 19d. Through control of the directivity switching switches 18, switching of a maximum gain direction of radiation directivity of the antenna is realized. Through control of the polarization switching switches 19a to 19d, switching of a rotation direction of a circularly polarized wave which is emitted from the antenna can be realized.

The present invention relates to a circularly polarized antenna which is applicable to small-sized communication modules and terminals to have a subminiature and ultralight antenna using a coaxial connector and a serial power distributor, including: an upper printed circuit board having a plurality of horizontal monopole radiation elements which are arranged at a constant interval; a lower printed circuit board having a feed network which is provided at a constant interval from the upper printed circuit board to face the upper printed circuit board; and a plurality of coaxial connectors which electrically connect each horizontal monopole radiation element of the upper printed circuit board with the feed network of the lower printed circuit board.

A microstrip antenna has two feed points. The microstrip antenna includes a feeder circuit which is configured to feed, to the two feed points, electric signals whose phases are different by 90° from each other. The feeder circuit includes a Wilkinson coupler unit and a phase-shift unit each of which is formed as a lumped constant circuit.

The invention belongs to the technical field of antennas, and provides an LTCC double-layer single-feed circularly polarized microstrip patch array antenna unit to solve the problem of the existing circularly polarized microstrip patch array antenna taking into account its low profile, circular polarization, and high The contradiction between gain and broadband development; in the antenna unit of the present invention, the size of the upper radiating metal patch is different from that of the lower radiating metal patch, and the resonance frequency of the lower radiating metal patch is higher than the center frequency of the antenna unit and the resonant frequency of the upper radiating metal patch The point is lower than the center frequency of the antenna unit; the cut angle size of the lower radiation metal patch is larger than the cut angle size of the upper radiation metal patch, and the cut angle dimensions of the upper and lower radiation metal patches make the single-point feed square patch produce Two orthogonal degenerate modes with equal amplitudes form a 90° phase difference; the present invention better takes into account the low profile and circular pole of the microstrip patch antenna by using the upper and lower radiating metal patches with the same shape and different sizes. Optimized performance requirements, while greatly improving the frequency bandwidth of the antenna.

The invention discloses a millimeter-wave four-polarized frequency scanning antenna, and relates to a multi-polarized frequency scanning antenna capable of being applied in fields such as millimeter-wave wireless communication system, radar detection and the like. An upper-layer metal copper-clad surface (1) and a lower-layer metal copper-clad surface (2) of the antenna are positioned on a front side and a back side of a dielectric substrate (3) respectively; and a metalized through hole (4) pass through the dielectric substrate (3) and is connected with the upper-layer metal copper-clad surface (1) and the lower-layer metal copper-clad surface (2) to form a substrate integrated waveguide 90 DEG directional coupler (5), a substrate integrated waveguide 16-groove 45 DEG slot leaky-wave antenna (6), a first clearance channel (61), a substrate integrated waveguide 16-groove -45 DEG slot leaky-wave antenna (7), and a second clearance channel (71). The whole antenna adopts substrate integrated waveguide for design, can be directly integrated with a radio-frequency circuit, and has the characteristics of low consumption, low cost, easy mass production and the like.

The invention belongs to the technical field of antennas, and in particular relates to a novel LTCC wideband circularly polarized microstrip patch array antenna, which is used to overcome the disadvantages of the existing circularly polarized microstrip patch array antenna in consideration of its low profile, circular polarization, and high Insufficient in terms of gain and broadband. The antenna includes a grounded metal layer, a lower dielectric substrate, a lower metal patch antenna, an upper dielectric substrate, and an upper metal patch antenna stacked in sequence from bottom to top. The upper and lower metal patch antennas are respectively composed of several The upper and lower metal patch units are composed of square metal patches with cut corners of the same size and rectangular grooves are opened at the corners, and rectangular grooves are opened on the four sides of the upper metal patch unit. Slits, rectangular slits are also opened on the other three sides of the metal patch unit on the lower layer except the feeding side. The present invention can have smaller size, higher gain, better circular polarization performance and wider frequency bandwidth under the limitation of the same number of array elements.

The invention provides a dual-band dual-circular polarization mixed dielectric resonator antenna for vehicle built-in, including a dielectric resonator, a dielectric substrate, a metal ground plane and a microstrip line; the microstrip line is arranged at the center of the bottom of the dielectric substrate, and the metal The ground plane is set on the surface of the dielectric substrate, and a gap is opened in the middle of the metal ground plane, and the gap is perpendicular to the bottom microstrip line; the dielectric resonator is set directly above the gap; the dielectric resonator includes a prism, and the upper part of the prism is provided with a mixing cylinder , the mixing cylinder is a hollow cylinder, the hollow cylinder is provided with a liquid, and the hollow cylinder is a metal dielectric; the upper and lower corners of the prism are provided with triangular prism-shaped gaps; through the gap coupling feed, the fundamental mode and High-order mode to obtain dual-band, the hybrid antenna is achieved by adding liquid to the hollowed-out cylindrical part, which expands the high-frequency bandwidth and has little effect on low-frequency, the gain of the antenna is improved after adding water, and water increases the gain at high frequencies Increase.

The invention discloses a ring-loaded microstrip patch antenna, comprising a reflecting plate (1), a lower patch (2), an intermediate patch (3) and a ring-loaded upper patch (4), wherein a short-circuit metal column (6) with a hole in the middle serves as a support among the three patches and the reflecting plate (1); a cover plate (5) is superposed on the upper patch (4); a feeder of the upper patch (4) passes through the hole in the middle of the short-circuit metal column (6), is connected with an impedance matching segment (12) on the cover plate (5) and then is fed onto the intermediate patch (3); a feeding port (8) of the intermediate patch (3) and a feeding port (9) of the lower patch (2) are connected with the circle center of the patches by lines to form included angles of 90 degrees to feed in circularly polarized radiation waves with equal signal amplitude and phase difference of 90 degrees; and the edge (11) of the upper patch (4) turns downwards to form a ring similar to the bottle cap. The edge of the upper patch turns downwards and the antenna utilizes the ring loading technology, thus increasing the gain of the upper patch and lowering the sidelobe and back lobe level.