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The composition of an RF coaxial connector affects its mechanical, electrical and environmental properties. Therefore, during the initial design of the connector, the selection of the base material will determine the operation of the entire system. As RF coaxial connector designers, we must consider the characteristics of the material itself, connection requirements, cost and other requirements. Material is very important for RF transmission. It is the basis of uninterrupted circuits and prevents the circuits from being interfered with. In this chapter, we will start with the structure of RF coaxial connectors and specify the common materials and their properties of the components that make up the connector. Common metal materials Among the components of the RF coaxial connector, the screw sleeve, the main body, the center pin, the solder cup, and the tail pipe are all metal products. Beryllium bronze, tin phosphor bronze, brass and stainless steel are common metal materials in RF coaxial connectors, each with its own characteristics.
Beryllium bronze(1)Beryllium bronze has good electrical properties, heat transfer properties, fatigue resistance and strong corrosion resistance (except ammonia, strong acids and alkalis);(2)Good heat transfer properties and elasticity so that it does not melt in high temperature environments, and other properties will not be impaired due to high temperature. Beryllium bronze is usually used for:contact holes, i.e., sockets (where electrical contact is made), elastic pins, conductors at the outer end of interfaces, etc. qsn6.5 0.1(1) The alloy material is soft, and can be stressed by cold working (compression bending);(2) Tin-phosphor bronze has a certain degree of softness, which makes it a good substitute for other copper alloys. When the production budget does not allow or electrical properties do not necessarily require beryllium bronze, tin phosphor bronze can be used instead. Tin bronze can be used for:Larger jacks, flexible contacts or outer conductors. Brass (1) brass is soft and easy to process, so it is called "easy cutting brass". Compared with beryllium bronze, brass has good thermal contact and thermal conductivity and electrical conductivity; (2) can resist industrial, marine, agricultural, atmospheric and various oil pollution and corrosion. It is usually plated with gold, silver, ternary alloy or nickel to improve its corrosion resistance and strength. Brass is commonly used for:Connector body, shell, outer conductor and pins. Stainless steel (1) Stainless steel is suitable for the connector industry where high material hardness is required (e.g., outer conductor); (2) High stability, high melting point and excellent corrosion resistance. Some connector shell components (such as shell) will use stainless steel. Stainless steel is generally used as the base material, shell material or outer conductor material. Aluminum alloy (1) Aluminum is generally used in the form of alloys, the most typical is the "anti-cobalt" alloy. (2) Aluminum alloy is easy to process, has good electrical properties, heat transfer and self-protection properties (oxidation resistance), light weight, and good workability. Sometimes it is used as a substitute for some metals (brass, stainless steel). Aluminum alloys can be used for:Protecting structural parts of tubes and connectors.
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