Determinants of Connector Series and Style

There are many factors that determine connector series and styles, with mating cables and frequency range of use being the main ones. In engineering practice, small and cable diameters are as similar as possible to minimize reflections. The greater the difference between cable diameter and connector diameter, the worse the performance. Reflectivity increases as a function of connector diameter, while generally smaller connectors in the higher frequency band, performance is usually very good. For very high frequencies (above 26 GHz), dielectric connectors are used. The frequency range determines the series of connectors to be used. On our website, you can find a variety of connector families and their standard makes. Usually at lower frequencies (below 6 GHz), push-in locking or bayonet snap-lock connectors are used. Threaded locking connections are usually used in high performance applications. Usually the cable gauge determines the impedance of the connector. 50 and 75 ohms are the two most used standard impedances, while many connector series have both impedances. Common cables and their characteristics can be found on our website. Sometimes below 500 MHz, 50 ohm connectors can be used at 75 ohms with acceptable performance. The reason for this is that 50 ohm connectors are generally cheaper and they are widely used. In addition to matching cables and connectors as closely as possible in size to minimize errors, connector interfaces and insulator materials are also heavy on linear butt and air-jointed interfaces (e.g., SMA and N-type interfaces) to provide high-frequency, low reflectance performance, whereas overlapping dielectric interfaces (e.g., BNC and SMA) are often limited in performance. The charts that typically reflect connector performance are reflection coefficient charts.

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