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How to reduce passive intermodulation in cable assemblies
In cellular communication systems, engineers are most concerned with third-order intermodulation products (2f1-f2 or 2f2-f1) because these unwanted frequency components tend to fall into the receiving band and interfere with the receiver. Cable assemblies are usually Considered as a linear device.
However, pure linear devices do not exist. There are always some non-linear factors between the joint and the cable, which are usually caused by surface oxide layers or poor contact. The following general design principles can reduce passive intermodulation distortion:
Try to replace the flexible cable with a semi-steel cable or a semi-flexible cable in the equipment.
Cable with single inner conductor
High quality joint with smooth surface
Joints of sufficient thickness and uniform plating
Silver or ternary alloy material
Use the largest possible size of the joint (such as DIN7/16 intermodulation characteristics better than N, and N is better than SMA)
Ensure good contact between the joints
Joint using non-magnetic materials
Shenzhen Tiankele Communication Technology Co., Ltd. has three professional laboratories of machinery, electrical and environment, and an integrated industrial chain from machining, assembly testing and electroplating. 11 years of focus on RF cable assembly manufacturers, professional to provide customers with high quality and high performance RF cable assemblies.
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