What does "high frequency" use of ground instead of single line grounding mean?
This is not the problem of several laps of the copper wire. Flat copper strip for use. How long is the length? Generally related to the wavelength of the signal source, as if the 1/4 wavelength or 1/2 wavelength, can not remember. 1MHz signal, you can calculate how long wavelength. Generally speaking, not more than half a meter to two meters even longer. So the ground must be grounded nearby. Therefore, the grounding grid must be laid on the base of the equipment frame. Generally speaking, it is possible to refer to the information system grounding national standard atlas.
The grounding wire of the equipment room is usually surrounded by copper strips, and the equipment is near to the ground copper strip with short line grounding. If the same as low-frequency equipment, flat or flat copper single line grounding, it will cause some equipment ground wire is too long, resulting in electromagnetic radiation.
Accordingly, the maximum length of the ground wire of the high-frequency equipment is specified according to the signal wavelength of the device. If the source frequency is very high, then the ground line will be very short.
If the high frequency signal enters the grounding system, the ground wire will become the source of the high frequency signal, radiates the electromagnetic wave outward, the ground wire will become the antenna, will cause the electromagnetic interference to the periphery.
