4results about How to "Prevent external electromagnetic interference" patented technology

The invention discloses a planar integrated hollow rectangular dielectric waveguide, and relates to the field of planar integrated waveguides, and the planar integrated hollow rectangular dielectric waveguide comprises an upper dielectric layer, a middle dielectric layer and a lower dielectric layer which are distributed from top to bottom, and a metal ground plane attached to the lower surface of the lower dielectric layer. The left side air hole area, the middle wave guide area and the right side air hole area are distributed from left to right; the middle wave guide region is provided with an air slot in the center of the middle dielectric layer to form a hollow wave guide structure; a plurality of columns of air holes penetrating through the upper dielectric layer, the middle dielectric layer and the lower dielectric layer are formed in the left air hole area and the right air hole area, and an air hole array is formed. The planar integrated hollow rectangular dielectric waveguide designed by the application has the advantages of low loss, easy realization of integrated design and planar integration, and simple and stable structure.

The application relates to a shelter of a carbon fiber honeycomb composite board material with electromagnetic wave shielding, which comprises a metal plate and a metal frame, the metal plate is connected with a heat insulation foam plate, the sound insulation layer is connected with a fiber layer, the honeycomb plate is connected with a fixed plate, and the electromagnetic wave shielding layer is connected with a wave absorbing layer; the movable plate is connected with a spring, a honeycomb rod and a wave absorbing rod, and the rubber pad is connected with a guide groove; during installation, the guide groove is aligned with the rubber pad and connected, the spring is extruded under pressure, the shelter plate material and the metal frame are fixed through a fastening structure, and installation is sequentially carried out; when radar detection or electromagnetic waves appear, the radar detection waves or the electromagnetic waves sequentially pass through a reflection layer, the metal plate, the heat insulation foam plate, the sound insulation layer, the fiber layer, a bulletproof layer, the wave absorbing layer, the electromagnetic wave shielding layer, the fixed plate and the honeycomb plate, are attenuated layer by layer, the radar detection or the electromagnetic waves are shielded, the equipment in the shelter is prevented from being interfered by external electromagnetic waves, the radar detection is shielded, and the shelter is prevented from being discovered by the radar.

The utility model relates to the technical field of car light circuit, specifically disclose a miniaturized integrated car light BUCK circuit, including BUCK IC integrated chip, BUCK IC integrated chip includes VIN pin, EN pin, VOUT pin, FB pin, VCC pin and BST pin, has the first capacitor group and second capacitor group on VIN pin, the first resistance formation POWER IN is connected on EN pin, the voltage -division resistance for voltage division is provided with on FB pin, VOUT pin is connected with third capacitor group, the utility model discloses a purpose at to solve the traditional car light circuit reliability problem through car light BUCK circuit, help system improves stability.

The utility model relates to a micro coaxial radio frequency probe card, which belongs to the technical field of probe cards and comprises a substrate main body, fixed protection mechanisms are arranged at the top and the bottom of the substrate main body, and each fixed protection mechanism comprises a fixed support fixedly mounted at the top of the substrate main body. According to the micro coaxial radio frequency probe card, the fixing support fixes the coaxial radio frequency connector through the fixing groove, the radio frequency probe body is located at the top of the coaxial radio frequency connector, the arc-shaped top end of the radio frequency probe body is beneficial to contact with a device to be tested and guarantee accurate transmission of signals, and the protective copper pipe wraps the coaxial radio frequency connector to prevent signal leakage and resist external electromagnetic interference. The positioning block ensures that the coaxial radio frequency connector is accurate in position and prevents displacement; the grounding tube provides grounding shielding for the radio frequency probe, reduces external electromagnetic interference and ensures signal transmission stability; the radio frequency probe body is in contact with a device to be tested during testing, and a signal is transmitted through the coaxial radio frequency connector; and the fixed protection mechanism ensures stable work and accurate test.