This Architectural Drawing is AutoCAD 2d drawing of Antenna triple band details in AutoCAD, dwg file. Basically the frequency bands each range over from the lowest frequency to 10 times the lowest frequency. Antenna engineers further divide the bands into things like "X-band" and "Ku-band". That is the basics of frequency. To understand at a more advanced level move on to the next topic. For more details and information download the drawing file.