Raynool Blog
By Tony Huang | 07 August 2020 | 0 Comments

The source of PIM

What causes PIM
 
Clean metal surfaces with high contact pressure generally behave in a linear manner and do not generate PIM. Where there is loose contact between metal surfaces, a non-linear relationship and the contaminated junctions causing PIM to be generated. There are a number of factors can cause PIM.
 
During the manufacturing process, including:
 
Contaminants such as solder splatters
Insufficiently thick plated metal
Scratches on the connector faces during the assembly procedure.
Ferromagnetic material plating
 
During the transportation process, including:
 
Contamination in dielectric material
Scratches on the connector faces during the transportation process
 
During the installation process, including:
 
Loose metal-to-metal contacts
Ferromagnetic materials in or near the current path
Contact between dissimilar metals
Cracks caused by over tightening the back nut during installation.
Structures or objects in close proximity to the site
 
During the installation environment, including:
 
Nearby metallic objects in the main beam and side lobes of the transmit antenna including roof flashing, vent pipes, guy wires, etc.
 
How to eliminate PIM
 
Low PIM Connectors, cable assemblies, passive components are often tested for PIM both in the design and production processes. Carefully design of the PIM system can eliminate the PIM caused by installation.
 
 
 
 
Conclusion
 
With the wireless service providers adding advanced 4G services, the complexity of the RF path is growing dramatically, each new element introduced to the system increases the chances for PIM, wireless service providers must ensure every component in the system is Low PIM.
 
Raynool provide Low PIM connectors, adaptors, cable assemblies, passive components tailor for Low PIM systems.
 

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