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Typical causes of PIM

Author: Date:10/12/2019 12:08:28 AM
   In RF devices (antennas, cables, filters, etc.), the typical causes of PIM generation are as follows:

1. Poor mechanical joints in the RF channel;

2. The material of the RF device has hysteresis (such as stainless steel);

3. The surface or contact surface in the RF channel is contaminated. For example: solder (which will adsorb other contaminants) and metal particles during processing.

In a complete base station, any passive device between the high power amplifier and the receiver filter produces a severe passive intermodulation signal. Metal towers around the tower ("rusted screw noise") or the direct wave of the transmitting antenna also produce passive intermodulation signals.