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News

Coaxial connection line with passive intermodulation test

Author: Date:8/26/2019 8:18:15 AM
    The production of coaxial cables requires passive passive intermodulation testing. In high-power or multi-channel systems, the nonlinearities of these passive components produce higher harmonics relative to the operating frequency. These harmonics Mixing with the operating frequency produces a set of frequencies, the end result of which is a set of useless spectrum in the air that affects normal communication. All passive components generate intermodulation distortion. There are many reasons for passive intermodulation, such as unreliable mechanical contact, virtual soldering and surface oxidation.


 

     Passive Intermodulation (PIM) is a distorted signal produced by the mixing of two or more different frequency signals into a passive device due to the nonlinearity of the connection point or material. The generation of interference is related to the local downlink frequency, which can cause the uplink frequency band to rise when multiple systems share the infrastructure. The impact of PIM on network quality is very serious, especially for broadband systems such as UMTS or LTE. PIM interference can cause Receiver sensitivity decreases, dropped call rate increases, access failure rate increases, premature switching, lower transmission rate, and reduced system coverage and capacity.

 

     RF interference, including antennas, TMAs, antenna duplexers, duplexers, lightning arresters, cables and connectors. In addition, when the antenna system is radiated with high power, loose mechanical connections and rusted surfaces can also cause PIM interference.