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

The invention discloses a symmetrical function-optional spatially parallel coupling magnetoelectricity-adjustable microwave filter and a method. The two ends of a GGG substrate are connected with the two ends of another GGG substrate through piezoelectric phases, ferromagnetic phase films grow on the GGG substrates, metal microstrip lines are made on the upper surfaces of the ferromagnetic phase films by adopting the film coating technology, and the two GGG substrates are oppositely arranged in parallel. Metal films are plated on the upper surfaces of the piezoelectric phases and the lower surfaces of the piezoelectric phases. The two metal microstrip lines are provided with four ports, the port in one side of the corresponding metal microstrip line serves as an input port, and the two ports in the other sides of the metal microstrip line serve as output ports. The symmetrical function-optional spatially parallel coupling magnetoelectricity-adjustable microwave filter and the method overcome the defects that a traditional filter is not adjustable in working frequency band and a traditional magnetism-adjustable microwave device is large in loss, long in response time and the like, on the basis, the selectivity of functions of band pass and band stop is added by using the ports, the defect that the band pass and the band stop are single in performance when the device is used is overcome, and the symmetrical function-optional spatially parallel coupling magnetoelectricity-adjustable microwave filter and the method can be widely and flexibly applied into wireless communication.

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.

The invention relates to a coarse and fine adjustment combined pressure annunciator. The annuciator comprises a socket, a shell, a micro switch, a hard core, a membrane, a regulation spring, a spring disc, an adjusting bolt, a nozzle, a disc spring, an adjusting nut and a limit swivel nut, wherein the work pressure is controlled by the disc spring serving as a sensitive element, and the adjustingnut and the limit swivel nut are matched to realize the coarse adjustment for a working pressure point; the adjusting spring, the spring plate and the adjusting bolt are added based on the coarse adjustment, the adjusting spring is compacted by the membrane and the spring plate, and the spring plate is limited by the bolt; and the fine adjustment for the work pressure point can be realized by rotating the adjusting bolt. Therefore, the pressure annunciator solves the problems of difficult point adjustment, low accuracy and low product qualification rate of the conventional pressure annunciator, and improves the accuracy and qualification rate of the product.

The invention discloses a method for adjusting the motion of a large vibrating screen. The method comprises the following steps: (1) constructing a calculated projectile intensity-excitation circularfrequency database of the vibrating screen; (2) collecting displacement signals of a screen body in horizontal and vertical directions and motor speed signals of an excitation system; (3) obtaining amplitudes of displacement signals and the actually measured excitation circular frequency under the circumstance of stable motion of the vibrating screen; (4) calculating the actual projectile intensity; and (5) carrying out coordination control on the excitation system and a vibration isolation system on the basis of the required projectile intensity. The invention also discloses a system for adjusting the motion of the large vibrating screen. The system comprises a displacement detecting module, a rotation speed detecting module, a signal collecting card, a computer, a frequency converter, anactuator and a coordination controller. By means of the method and the system for adjusting the motion of the large vibrating screen, which are disclosed by the invention, the technical problems of low adjustment accuracy, small range, low efficiency and the like of conventional motion adjusting techniques can be solved.