커넥터 RF

RF connectors are devices that allow for radio frequency (RF) signals to be sent into or out of subsystem modules and circuits. They typically allow for subsystems to be interconnected via cabling or direct connection to an external antenna. RF Connectors are also available for board to board interconnect. Typical applications include mobile radios, cell phones and high-performance data interfaces. Arrow stocks several different RF connector types, with various orientations, impedance characteristics with frequency and target application requirements. They can be board-mounted with SMT and through-hole alternatives. Chassis mounted, or bulkhead electrical connectors, that use a cable to connect to the PCB are also available. RF connector adapters exist for connecting between connector types for cable conversion, as well as for converting between male and female interfaces. Key electrical performance aspects of RF connectors include characteristic impedance of the connector (related to the cabling the connector is going to attach too), return loss (match – or reflection of the signal) and insertion loss (attenuation of the signal). These must be carefully considered in RF systems, as loss of signal can lead to reduction in receiver sensitivity or transmitted output power. When high frequency RF connectors are used in data cabling (for example UHD SDI Video feeds) – the quality of connector can impact the length of cable able to be used between devices. Typical impedances of RF interconnection are 50 Ohms and 75 Ohms. Connectors are referred to as plug/male and jack/female. Various connectors mate with different mechanisms. BNC connectors have bayonet style interlocks. N-Type and TNC have a shroud that threads over the connector for a robust connection. SMA and SMB are other examples of threaded connections. Some (for example F Connectors) use the center core conductor of the cable to mate with the jack rather than a pin. Some miniature board mounted or ultra-thin cable connectors use smooth bore connections held together by contact pressure. These are intended to be used internally for a product chassis but are also seen on instrumentation equipment. An example of this is a UMC-MMXC RF connector. Although connectors are typically used in their designated frequency bands of operation, they are also used in applications where they are operating totally outside their band, but the overall circuit design accommodates for their loss. An example of this is UHD video feeds. It is typical to see 75Ohm BNC connectors with maximum frequency specifications of 1.5GHz used in systems with 6Gbit/s serial data exhibiting loss in the region of several dB and poor match. Video systems accommodate for this in the same way as they do for the loss in the cable itself, by equalization of the received signal in the receiver. Other important characteristics to consider in the connector choice are the insertion force requirements, the tools used to connect and the number of insertions a connector can reliably support without diminished performance. Many connectors have to deal with extreme temperature and environmental considerations and temperature cycling – it pays to consider a products environment requirements as part of the decision making process.