56results about How to "Good circular polarization characteristics" 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.

The present application discloses a broadband circularly polarized magnetoelectric dipole antenna. By setting a metal parasitic ring, the circularly polarized bandwidth of the antenna can be greatly improved without changing the main structure of the antenna. At the same time, the broadband circularly polarized magnetoelectric dipole antenna of the present application adopts the feeding method of slot coupling, and adopts the metal feeding strip on the lower surface of the dielectric substrate to couple the coupled signal to the horizontal metal patch above the metal floor through the rectangular slot and vertical metal patch, and set a metal parasitic ring around the metal patch module to introduce a new circularly polarized resonant mode for the magnetoelectric dipole antenna, so that the antenna has a better circular polarization in the broadband operating bandwidth. Polarization characteristics. In addition, the structure of the metal parasitic ring will not affect the structure of the antenna, and, on the premise of maintaining the broadband circular polarization bandwidth, the gain fluctuation in the working frequency band is small, and the gain bandwidth of the broadband and better flat gain.

The invention relates to a compact circularly polarized microstrip antenna and its antenna array. The upper and lower dielectric plates and the substrate of the circularly polarized microstrip antenna are the same square, the square radiation patch is attached to the surface of the upper dielectric plate, and the substrate is attached to the upper surface of the upper dielectric plate. Attached to the upper surface of the lower dielectric board, the microstrip feeder is attached to the lower surface of the lower dielectric board. There is an air layer between the substrate and the upper dielectric board. In the center of the substrate, there are cross grooves in which vertical and horizontal grooves bisect each other vertically and horizontally. There are 3 to 7 grooves on each side of the radiation patch on the top layer. The groove on the center line is the deepest, and the depth of the grooves on both sides gradually decreases. The groove of is symmetrical about the center of the radiation patch. The compact circularly polarized microstrip antenna is an antenna array composed of array elements. Each power divider is connected to each array element feeder, and multiple array elements are arranged in a straight line on the same plane, or arranged in a square array on the same plane. The invention has better circular polarization characteristics, reduces the size of the antenna, reduces the distance between elements of the antenna array to 0.6λ, and has a compact structure of the antenna array.