4 results about "Electromagnetic wave polarization" patented technology

The application discloses a method for estimating the elevation angle of a slant ionospheric sounding incoming wave based on polarization response, which comprises the following steps: obtaining the polarization response information of the incoming wave through an orthogonal receiving antenna, so as to determine the limit polarization of the incoming wave signal from the ionosphere into free space, and determining the direction of the incoming wave through the relationship between the limit polarization and the elevation angle of the incoming wave and the geomagnetic field. The method for estimating the elevation angle of the slant ionospheric sounding incoming wave based on polarization response can be applied to the acquisition of the elevation angle information of the incoming wave through the processing and estimation of the polarization information of the electromagnetic wave, and can also be used as an auxiliary means of the traditional short-wave direction finding method.

This invention discloses a Ku-band wave-to-wave conversion structure, relating to the fields of millimeter-wave communication and radar technology. The Ku-band wave-to-wave conversion structure comprises a three-layer planar structure based on PCB / LTCC technology. The top layer is a graded dielectric substrate, the dielectric constant of which is gradually varied by a doping concentration gradient. The middle layer is a metal microstrip line array, with the linewidth and spacing continuously varying along the propagation direction. The bottom layer is a copper foil grounding layer. The Ku-band wave-to-wave conversion structure provided by this invention is used to achieve efficient conversion of electromagnetic wave polarization modes over a wide frequency band.

The application provides a conformal protective cover based on a gradient metasurface, which comprises a protective layer, a first phase gradient metasurface layer, a first dielectric layer, a second phase gradient metasurface layer and a second dielectric layer; the first phase gradient metasurface layer is sandwiched between the protective layer and the first dielectric layer; the second phase gradient metasurface layer is sandwiched between the first dielectric layer and the second dielectric layer. The profile of the protective cover is a hexagon, wherein the first layer of phase gradient metasurface is conformal to the circular arc-shaped protective layer, and the second layer of phase gradient metasurface is arranged between the circular arc-shaped first dielectric layer and the second dielectric layer. The phase gradient metasurface is composed of a plurality of phase gradient metasurface units arranged periodically, and each phase gradient metasurface unit comprises a square patch and a Jerusalem cross structure. The application is transparent to electromagnetic waves in a communication frequency band, and is stealthy outside the communication frequency band, and has the advantages of being insensitive to electromagnetic wave polarization, simple overall structure, light weight and easy processing.

This invention discloses a waveguide polarization adjustment device for a Ku-band transceiver channel, comprising a polarization adjustment rotor capable of adjusting the waveguide polarization angle of the Ku-band transceiver channel; a common waveguide with the polarization adjustment rotor rotatably mounted inside; a drive mechanism capable of driving the polarization adjustment rotor to rotate; and a positioning component capable of detecting and positioning the rotation angle of the polarization adjustment rotor. The polarization adjustment rotor includes a cylindrical waveguide channel, a first annular groove, a polarizing plate, and a second annular groove. The first annular groove is formed at one end of the polarization adjustment rotor, and the second annular groove is formed at the other end. A cylindrical waveguide channel is hollow inside the polarization adjustment rotor, and a polarizing plate is centrally mounted within the cylindrical waveguide channel. By continuously rotating the polarization adjustment rotor 360 degrees within the common waveguide channel, the polarizing plate inside the cylindrical waveguide channel deflects synchronously, achieving precise fine-tuning of the electromagnetic wave polarization angle arbitrarily from 0° to 360°.