What are the design principles for rf coaxial connectors

    Talking about the design of rf coaxial connector, it is estimated that many foreign trade practitioners will feel a blank face, because in general, what we contact is the product, and did not think about its design, so what is the design principle of rf coaxial connector?

    No matter what aspect it is, there are some basic points that need people's attention. So is the design of rf connector. The working principle of rf connector is simple, which is a coaxial transmission line that can realize electrical connection and separation in rf transmission system.

    The realization of the mechanical process of connection and separation requires the connector to have a reliable connection interface. The applicability and convenience of connector require many different specifications and forms of connection interface. The universality and interchangeability of connector require the standardization of connection interface. The reliability and stability of connection and separation require the interface size of connector, the relative position of inner and outer conductor and sufficient mechanical holding force. This is the basic requirement of connector interface and structure. On the other hand, connector needs to be connected with coaxial cable, microstrip and other transmission lines. It is also necessary to consider the compatibility, stability and connection reliability of connection transition.

    Technicians believe that the stability and reliability of mechanical connection is the basis of realizing the reliability and stability of the electrical connection of rf coaxial connectors. The stable and reliable mechanical structure coupled with uniform matching impedance and reasonable dielectric material can obtain the rf coaxial connectors with excellent electrical performance.

    At the same time, the technician should point out that the impedance discontinuity is unavoidable: the mechanical connection of the interface and the tolerance of the interface lead to the impedance discontinuity of the interface; Step positioning structure used to ensure mechanical stability leads to the existence of discontinuous capacitance. Mechanical tolerance and dielectric electrical parameter drift lead to characteristic impedance drift; The characteristic impedance discontinuity is also caused by the adaptivity of connector, cable, microstrip and other rf transmission lines and the shape change of electromagnetic field. Only by identifying and compensating these discontinuities can rf coaxial connectors have better electrical performance.

    For rf coaxial connector design compensation calculation have a lot of theory books, academic papers by more detailed and comprehensive introduction, DE hardware ideas discussed here is not much to do, but to be sure the vast majority of empirical formula is derived based on the research of the large size coaxial transmission line, for use at ordinary times frequency lower connector design, its accuracy is completely can cope with, and for small size, high frequency, high performance requirements of connector (e.g., millimeter-wave connectors) in terms of design, Due to the influence of size tolerance, surface roughness, surface resistivity of metal materials and stability of dielectric parameters, the results obtained here are only for reference.

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