Main indicators of 1.85mm rf connectors

A radio frequency connector (RF coaxial connector) is an electrical connector that is generally used with coaxial cables. The shielding effectiveness of RF connectors is generally better. Therefore, 1.85mm rf connectors are more and more used in RF products and digital circuits. But there are many types of RF coaxial connectors, and it is often easy to confuse them. The model of the RF coaxial connector consists of two parts: the main name code and the structure code, separated by a dash "-". The nomenclature of the different structures of a specific product is specified by the detailed specification.

What type of RF connector to choose depends on your actual application. If you choose purely from performance, you can judge it according to its electrical performance indicators. The main indicators of 1.85mm rf connectors:

Impedance: Almost all RF connectors and cables have a standardized 50ohm impedance. The only exception is the cable connector for 75ohm TV systems. It is also important that the 1.85mm rf connectors has a matching characteristic impedance of the cable.

VSWR (Voltage Standing Wave Ratio): VSWR is an indicator that engineers often use to evaluate 1.85mm rf connectors, and it is similar to impedance. In general, the VSWR is guaranteed to be less than 1.2 within the frequency range of interest. But it is not necessary to reach 1.2, and some meet the requirements of 1.5 or 2. The lower the better, of course, the higher the cost.

Frequency range: The frequency range of 1.85mm rf connectors must be paid attention to in the field of high frequency and high speed. The frequency is divided into several grades, such as 1~6GHz, or 0~18GHz, 20GHz, 27GHz, 40GHz, 50GHz, 67GHz, 110GHz or even higher.

Insertion Loss: Loss is a metric that all connectors look at. It's just that the loss of the 1.85mm rf connectors is usually relatively small (if it is too large, there is a problem). Generally, it is within 0.1~0.5dB within the frequency range of interest.

Return loss: For some engineers who do digital circuits, VSWR is not so intuitive, so some will use return loss to characterize.
Use (plug) times: For electronic engineers (RF engineers, SI engineers), they may not pay much attention to the number of times the connector is used. The number of times of use is generally considered to be how many times the connector is plugged and unplugged, and the performance of the connector changes. Generally, the number of insertion and removal of 1.85mm rf connectors is 500 or 1000 times, and there will be higher requirements. If you want to do some experiments on this, you must do it under a specific torque/torque, otherwise it will be difficult to guarantee this number of uses. The connectors I have used have generally not reached this number of times. It is estimated that they can be used 100 or 200 times. The inner core has been deformed, because there is always a possibility that it may be inserted crookedly or twisted with excessive force.