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VSWR (Voltage Standing Wave Ratio) is a measure of how efficiently radio-frequency power is transmitted from a power source, through a transmission line, into a load (for example, from a power amplifier through a transmission line, to an antenna). Return loss is a logarithmic ratio of the power reflected from a system to the power entering that system, as defined in Equation 1. Return loss is expressed in decibels. The higher the number, the lower the amount of reflected energy.

SMA and SMB connectors are both types of RF (radio frequency) connectors, but they are not compatible with each other and have different characteristics.SMA (SubMiniature version A) connectors have a 1/4-inch diameter, 36-thread-per-inch threaded interface screw-type coupling mechanism and a 50 Ohm

SMA connectors are a type of coaxial connector that was developed in the 1960s for use in high-frequency microwave and millimeter-wave applications. They are named for their screw-type mating mechanism, which allows for a secure connection between two SMA connectors. SMA connectors are commonly used in a wide range of applications, including telecommunications, networking, military and aerospace, medical equipment, and more.

SMA connectors are typically made of a combination of different materials, to control the cost of product precisely, we choose the variety materials for SMA The materials used are determined by the needs and application scenarios of the clients. Consumer clients, for example, require low-cost solutions. We can use brass solutions for the body, nut, pin, and socket, and PTFE for the insulator. For military and laboratory applications, we can utilize stainless steel body and nut, brass pin, beryllium copper socket, and PEEK insulator.