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What factors should be considered when selecting an RF connector?

Author: Date:6/5/2019 1:08:48 AM
 An RF connector is a type of connection device in an RF transmission system that transmits RF signals with small losses and reflections and provides fast and repetitive connections. Mainly composed of contact parts, insulators, housings and accessories.



The RF connector should be reliable in contact, have good conductive insulation properties, have sufficient mechanical strength, and the number of insertions and removals meets the requirements of international and domestic standards. At the same time, there are many factors that determine the connector family and style, where the mating cable and frequency range of use are the main factors. RF connectors should consider the following factors:

First, the frequency

The frequency range determines the range in which the connector is used. Usually at lower frequencies (below 6 GHz), push-in locking or bayonet snap-on connectors are used. Threaded locking connections are typically used in high performance, low noise environments.

Second, the impedance

Usually the cable specification determines the impedance of the connector. 50 and 75 ohms are the two most used standard impedances, and many connector series have 50 ohms. Sometimes at frequencies below 500 MHz, a 50 ohm connector can be used on a 75 ohm cable (and vice versa) and performance is acceptable. The reason for this is that the typical 50 ohm connectors are cheap and they are widely used.

Third, the insulator material

In addition to matching the cable and connector as closely as possible to minimize errors, the interface of the RF connector and the insulator material are also important considerations. Linear butt and air-connected interfaces (such as SMA and N-type interfaces) provide high-frequency, low-reflection performance, while overlapping dielectric surfaces (such as BNC and SMB) are often limited in frequency and reflectivity. A chart that typically reflects connector performance is a table of reflection coefficients. This is a measurement method that describes how much the signal is reflected back from the connector. It can be expressed in terms of reflection coefficient, voltage standing wave ratio (VSWR) and return loss.

Fourth, power and voltage

In some special application studies, power and voltage requirements are also a factor in determining the connector. For high power applications, large diameter connectors (eg 7-16DIN and HN types) are required. The general transmission power is determined by the transmission power of the electricity bill, which is usually determined empirically. The voltage breakdown level is determined by the peak voltage. Power transfer capability decreases with frequency and altitude.