The characteristic analysis on wireless electromagnetic short distance system for downhole data transmission

With the application of finite element software ANSYS, the wireless electromagnetic short distance system was modeled and analyzed. By exerting AC excitation source on the transmitting coil, the distribution of magnetic lines of force and magnetic induction intensity at the receiving coil end was observed, which verifies the feasibility of current field transmitting downhole data. Through analysis of the axial and radial distribution of signal intensity, the laws of signal transmission could be obtained. And under the condition of excitation amplitude unchanged, the relationship between signal intensity and transmission frequency was established. This is of great significance for choosing steady transmission frequency band, electronic devices and components.