Raynool Blog
By Tony Huang | 08 June 2023 | 0 Comments

What is Low PIM Connector (Part 1)

What is Low PIM Connector?
What is PIM
PIM is short for Passive Intermodulation. It is a problem that happens largely in passive devices such as Connectors, Coax Cables and Splitters where interfering signals are generated by nonlinearities within a wireless system's mechanism.
Sources of PIM
1 Ferromagnetic materials, including ferrites, nickel, nickel plating and steels, exhibit hysteresis when exposed to reversing magnetic fields, resulting in PIM generation.
2 PIM can also be generated in components with manufacturing or workmanship defects, such as cold or cracked solder joints or poorly made mechanical contacts. If these defects are exposed to high RF currents, PIM can be generated. As a result, RF equipment manufacturers perform factory PIM tests on components, to eliminate PIM caused by these design and manufacturing defects.
3 Inconsistent metal-to-metal contact between RF connector surfaces.
4 PIM can also occur in connectors unmatched metals come in contact with each other.
Low PIM Connector
The Low PIM connectors have a low PIM of < -160 dBc.
1 The designs incorporates lots of aspects and forces of contact assuring sufficient pressure for the prevention of PIM, including gold or silver-plated mid contacts while the connector bodies are white bronze or silver plated.
2 Manufacturing process is important, cold or cracked solder joints or poorly made mechanical contacts will cause PIM, these defeats may not appear at the beginning, but will have great risk in later application.
3 Keep clean of the connector, dirt, dust, moisture or oxidation in the surface or contact will cause PIM.
4 Pay more attention on installation. Inadequate torque, poor alignment or poorly prepared contact surfaces will cause PIM.

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