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RF coaxial connectors are an important aspect of RF and microwave applications requiring the transfer of signals between devices. The coaxial connecters have been the standard type of connection for many years due to their good electrical performance, robust construction and a wide range of applications. The application fields of RF coaxial connectors are divided into two categories: high power applications and low power applications. This article will discuss the working principles of both categories as well as the various types and designs.

High Power Applications: High power applications typically refer to applications where the RF or microwave signals are being used for broadcast transmission. In these applications, the connectors must be able to perform reliably, regardless of the frequency, bandwidth or power level. There are two types of connectors used in these applications: 50 Ohm and 75 Ohm. The 50 Ohm connectors are typically used for broadband applications with higher frequencies while the 75 Ohm connectors are used for narrower frequency bands. Both types of connectors use a central conductor, which is surrounded by an insulating material. A secure connection is then created by two or more metal sleeves that wrap around the central conductor and create a secure fit.

Low Power Applications: Low power applications typically refer to applications where the signals being transferred are of a lower power level. These applications include wireless communications, cellular phones and other low power transmitter/receiver applications. There are several types of connectors used in these low power applications, such as the SMA, SMB, UFL and MCX connectors. Each type of connector has its own characteristics and designs. For example, the SMA connectors have a threaded design while the UFL connectors have a snap-on design. The connector types also vary in terms of power handling capability, frequency range and signal integrity. Additionally, some connectors may have additional features such as shielding or impedance matching.

Working Principle: The working principle of RF coaxial connectors is based on the principles of electromagnetic induction. The basic components of a coaxial cable are the center conductor, the insulation, a shield or braid and the connector. When a signal is applied to the connector, the electric field of the signal induces a current in the center conductor which in turn generates an electric field in the insulation and a magnetic field in the shield or braid. These fields result in an electromotive force (EMF) and a current in the shield or braid. This EMF is then conducted to the output of the connector where it can be further connected to the device. The electric field in the insulation and the magnetic field in the shield or braid also act as a shield against outside interference.

In conclusion, RF coaxial connectors are a critical part of any RF or microwave system. They offer robust construction and good electrical performance for both high power and low power applications. The working principle of these connectors is based on the principles of electromagnetic induction and the various types of connectors can be chosen based on the power handling capability, frequency range and signal integrity required.