54results about How to "Achieve coarse tuning" patented technology

The invention discloses a magnetically and electrically-adjustable microstrip antenna and an adjusting method thereof. The microstrip antenna comprises a magnetic-electric laminated material substrate, electromagnets, a microstrip feeder, a ferromagnetic phase and a piezoelectric phase, wherein the magnetic-electric laminated material substrate comprises the ferromagnetic phase and the piezoelectric phase from top to bottom, the ferromagnetic phase and the piezoelectric phase are adhered through epoxy resin, a layer of metal film is respectively plated on the front side surface of the piezoelectric phase and the rear side surface of the piezoelectric phase, the lower surface of the piezoelectric phase is grounded, a metal microstrip patch is produced on the upper surface of the ferromagnetic phase through a photoetching corrosion method, the metal microstrip patch serves as a microstrip radiating unit and is connected through the microstrip feeder, and a pair of electromagnets are placed at the left end of the magnetic-electric laminated material substrate and the right end of the magnetic-electric laminated material substrate. According to the antenna and the adjusting method, defects that working frequency ranges of traditional microwave devices are not adjustable or adjustable working frequency ranges are simplex and can not bee adjusted accurately are eliminated, and the antenna and the adjusting method are applicable to adjustable application in wireless communication. Simultaneously, due to the magnetically and electrically adjustable characteristic, defects that traditional magnetically adjustable microwave devices are high in loss, long in response time and the like during working are eliminated.

The invention discloses a laser communication capturing and tracking system. A variable-focus liquid crystal lens is combined with a liquid crystal optical phased array and a liquid crystal optical wedge; the receiving powers of a coarse capturing detection module and a fine tracking detection module are detected in real time in a process of capturing and tracking space laser communication; according to change of the optical receiving power, the variable-focus liquid crystal lens dynamically controls the beam-divergence angle of a laser communication system; the beam-divergence angle is self-adaptively controlled in the capturing and tracking process; and the capturing time can be effectively increased while the tracking precision is ensured. Based on the laser communication capturing and tracking system disclosed by the invention, the invention further provides a capturing and tracking method for self-adaptively controlling the beam-divergence angle of the liquid crystal optical phased array; and a laser communication link is established through respective laser communication capturing and tracking systems of two communication sides.