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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.
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