Acousto-Electromagnetic Apparatus For Locating PIM

With the development of wireless communication technology, high power multi-channel communication system is needed. A potential source of interference called Passive Intermodulation (PIM) gradually cause for concern. The Passive Intermodulation interference phenomenon in high power multi-channel systems is attributable to many sources of non-linearity within the system. Passive intermodulation (PIM), however, occurs in passive devices (which may include cables, antennas etc.) that are subjected to two or more high power tones. The PIM product is the result of the two (or more) high power tones mixing at device nonlinearities such as junctions of dissimilar metals, metal-oxide junctions and even loose connectors. The higher the signal amplitudes, the more pronounced the effect of the nonlinearities, and the more prominent the intermodulation that occurs-even though upon initial inspection, the system would appear to be linear and unable to generate intermodulation.This dissertation start with the mesh reflector antenna and passive intermodulation, introduce mechanism and process of passive intermodulation. Then present a non-contact, acousto-electromagnetic approach for the measurement of mechanical resonance, and verified the feasibility of the method by experiments. Finally, provide an improved intermodulation interference locator apparatus working in a environment with a number of potential source of interference.This dissertation mainly discusses the ideas of PIM locator. Introduce mechanism and process of passive intermodulation then the experiment with simulation and test results are also shown. Theoretical and experimental results show that this kind of PIM locator has a good potential in applications.