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6 results about "Umbrella antenna" patented technology
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An umbrella antenna is a top-loaded electrically lengthened monopole antenna, consisting in most cases of a mast fed at the ground end, to which a number of radial wires are connected at the top, sloping downwards. They are used as transmitting antennas below 1 MHz, in the LF and particularly the VLF bands, at frequencies sufficiently low that it is impractical or infeasible to build a full size quarter-wave monopole antenna. The outer end of each radial wire, sloping down from the top of the antenna, is connected by an insulator to a supporting rope or (usually) insulated cable anchored to the ground; the radial wires can also support the mast as guy wires. The radial wires make the antenna look like the frame of a giant umbrella – without the cloth – hence the name.
Umbrella-shaped antenna surface structure
The utility model provides an umbrella-shaped antenna surface structure, which comprises a flexible antenna arc surface layer, a plurality of reinforcing layers and reinforcing ribs, the flexible antenna arc surface layer is an umbrella-shaped structure with a through hole in the middle, and the plurality of reinforcing layers are laid on the flexible antenna arc surface layer at intervals; and the plurality of reinforcing ribs are uniformly laid at intervals along the circumferential direction of the flexible antenna arc surface layer and are used for fixedly connecting the flexible antenna arc surface layer with the reinforcing layer. According to the utility model, the reinforcing layers are made of the toughened epoxy resin unidirectional carbon fiber prepreg, the placement direction is perpendicular to the reinforcing ribs, and the reinforcing layers are arranged at intervals, so that a reinforcing structure similar to a spider net structure is formed, and the arrangement of the reinforcing structure is beneficial to providing a strong supporting effect in the longitudinal and transverse directions when the antenna surface is unfolded; the overall stability when the flexible antenna surface is unfolded is maintained, the surface precision of the antenna surface is improved, the structural arrangement is reasonable and scientific, the weight of the antenna surface is light, and the surface precision is high.
Owner:SHAANXI TIANYI ANTENNA
A locking device for deploying and retracting an umbrella antenna and the umbrella antenna.
ActiveCN120089929BAntenna supports/mountingsAntenna adaptation in movable bodiesUmbrella antennaIn vehicle
Owner:CHINA ELECTRONICS TECH GRP NO 39 RES INST +1
A method for cutting a deployable umbrella antenna metal mesh
ActiveCN121373245BAccurate calculation of sizeImprove cropping accuracyUmbrellasMetal-working apparatusUmbrella antennaStructural engineering
The application discloses a cutting method for a deployable umbrella antenna metal net, which comprises the following steps: step 1, setting parameters of the deployable umbrella antenna; step 2, establishing a relationship between corresponding position points with the same height for two antenna ribs of each sector of the deployable umbrella antenna; step 3, defining an arc length between two points with the same height on the metal net boundary of each sector of the umbrella antenna, namely defining the width of the metal net at the corresponding position; step 4, calculating the width of the metal net at different height positions of each sector of the deployable umbrella antenna, namely obtaining the width of each height position during the cutting of the metal net; step 5, according to the symmetry of the umbrella antenna, the cutting of the remaining sectors is the same as the cutting method of the obtained sector; and step 6, cutting the metal net corresponding to each sector according to the cutting size of the metal net corresponding to each sector. The method has high calculation precision, the boundary cutting is accurate, and the metal net cutting process is basically waste-free.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Method for cutting expandable umbrella-shaped antenna metal net
The invention discloses a method for cutting a metal net of a deployable umbrella-shaped antenna. The method comprises the following steps of: 1, setting parameters of the deployable umbrella-shaped antenna; step 2, establishing a relationship of corresponding position points with the same height for two antenna ribs of each sector on the deployable umbrella-shaped antenna; 3, defining the arc length between any two points with the same height on the boundary of the metal net in each sector on the umbrella-shaped antenna, namely defining the width of the metal net at the corresponding position; 4, calculating the widths of different height positions on the metal net of each sector on the deployable umbrella-shaped antenna, namely obtaining the width of each height position when the metal net is cut; 5, according to the symmetry of the umbrella-shaped antenna, the cutting method of the other sectors is the same as that of the obtained sectors; and step 6, cutting the metal net corresponding to each sector according to the obtained cutting size of the metal net corresponding to each sector. The method is high in calculation precision, accurate in boundary cutting and basically free of waste in the metal net cutting process.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Locking device for umbrella-shaped antenna in lodging state on semitrailer platform
ActiveCN224248935UCollapsable antennas meansAntenna supports/mountingsUmbrella antennaStructural engineering
The utility model provides a locking device for a lodging umbrella-shaped antenna on a semitrailer platform, which comprises a mounting bracket, a sliding sleeve assembly, a movable top shaft, a deflector rod, a lead screw and nut assembly, a connecting seat and a top plate, the whole mounting bracket is of a frame type structure, the bottom of the mounting bracket is fixed with a semitrailer gooseneck platform, and the top of the mounting bracket is provided with an annular frame. The lead screw and nut assembly installed on one side of the installation support drives the shifting rod connected with the first lead screw and the movable top shaft to move, so that the top plate reliably presses the front end face of the umbrella-shaped antenna, and the situation that the face of the umbrella-shaped antenna in a lodging state is deformed and damaged due to bumping of a vehicle in the transportation process, and the precision and the normal use function of the antenna are affected is avoided. When the antenna locking device is used, only a nut in the lead screw and nut assembly needs to be rotated, the nut moves to drive the connecting base and the movable top shaft connected with the connecting base to move, the movable top shaft abuts against the top plate fixedly connected with the movable top shaft to move, the top plate body tightly abuts against the front end face of the umbrella-shaped antenna, antenna locking is achieved, and operation is easy.
Owner:CHINA ELECTRONICS TECH GRP NO 39 RES INST
umbrella antenna
Owner:SHENZHEN ZHIYUAN COMMUNICATION TECHNOLOGY CO LTD