3results about How to "Improve Caliber Efficiency" patented technology

This invention discloses a high-power horn array antenna based on equal-power-division ridged waveguide feeding, characterized by high power capacity and high gain. A 4:1 unequal power distribution is achieved in the BJ100 waveguide placed along its short side by loading a cylindrical inductive post offset 5.2 mm from the branch centerline. Based on stepped impedance matching theory, an inductive module offset 5.2 mm from the branch centerline is loaded at the ridged waveguide branch to achieve a 4:1 unequal power distribution in the ridged waveguide placed along its long side. The antenna is entirely filled with sulfur hexafluoride gas to achieve even higher power capacity. A waveguide transition structure is applied to achieve a transmission transition between the standard rectangular waveguide and the ridged waveguide, and a metal plate is added to reduce the back lobe of the antenna pattern and improve the main lobe gain. The antenna feeding structure uses a standard BJ100 waveguide and its ridged waveguide, both with a waveguide wall thickness of 1.27 mm. This invention achieves a power capacity greater than 1MW in the 9.35~9.65 GHz frequency band, and within a 312mm×312mm aperture plane, the center frequency gain is greater than 29.6dBi, and the aperture efficiency across the entire frequency band is greater than 75%.

The application provides a broadband high-efficiency circularly polarized low-profile folded transmission array antenna, and relates to the field of antennas and microwave technology.The transmission array antenna comprises a feed source, a reflection array surface and a transmission array surface; the transmission array surface is arranged by a plurality of transmission units; each transmission unit comprises a transmitting patch; the transmitting patches are arranged according to a target rotation angle; the target rotation angle is an angle corresponding to the case that the transmission phase of each transmission unit is set to be the same as the first compensation phase of each transmission unit; the reflection array surface is arranged by a plurality of reflection units; each reflection unit comprises a polarization twist patch; the polarization twist patch comprises a pair of symmetrical curved sections and a connecting part connecting the two curved sections; the radii of the two curved sections are arranged according to a target radius; the target radius is a radius corresponding to the case that the reflection phase of each reflection unit is set to be the same as the second compensation phase of each reflection unit.The transmission array antenna has the advantages of high aperture efficiency and wide bandwidth.

This application discloses a foldable screen device, relating to the field of electronic product technology. The foldable screen device includes a first body, a second body, and a first switching tuning circuit. The first body and the second body are rotatably connected. The first body includes a first radiator, and the second body includes a second radiator. The first radiator includes a first feed point, and the second radiator includes a second feed point. The first radiator is a radiator for a first antenna, and the second radiator is a radiator for a second antenna. The first feed point is a feed point for the first antenna, and the second feed point is a feed point for the second antenna. The first feed point is grounded through the first switching tuning circuit. When the foldable screen device is in a folded state, the first radiator and the second radiator are opposite each other. When the first switching tuning circuit is in a first state, the first radiator forms an auxiliary parasitic unit for the second antenna.