SMA connector is a widely used half-precision ultra-small RF and microwave connector, especially suitable for RF connections in electronic systems with frequencies up to 18 GHz or higher. The following will briefly introduce the use of SMA connectors.
How to connect the SMA connector?
How to distinguish the quality of SMA connectors?
What is the meaning of SMA connectors?
How to connect the SMA connector?
1. Prepare the raw materials.
2. Strip the shielded wire and the middle wire.
3. Insert the middle thread into the needle hole.
4. Solder with a little solder. Note: Do not get the solder out of the pins.
5. Insert the wire into the SMA male connector. The shield wire wraps the tail of the SMA male connector.
6. Put the matching small steel cylinder on the tail.
7. Put on the heat-shrinkable tube.
8. Blow the heat-shrinkable tube with a heat gun until the tail of the SMA head is wrapped.
9. Do the same operation on the other end to make one.
10. Make another one of the same lengths, and a pair of wires will be ready.
How to distinguish the quality of SMA connectors?
1. The quality of the SMA connector can only be seen from the outside, but what affects the signal transmission (or reflection) is not the SMA connector itself, but often the coaxial cable or the connection between the circuit board and the SMA. With the same SMA connector, different people's connections may end up with very different standing wave ratios, so the connection between SMA and circuit board or coaxial cable is very important, especially when the frequency is high.
2. The denser the shielding layer, the smaller the signal leakage to the outside, or the smaller the leakage from the outside world. The general index is the isolation, and the isolation of a good cable can be more than 100dB. I see single-layer, double-layer, and rigid shielded coaxial cables that I buy in the market. Of course, the prices vary greatly.
3. In addition to the leakage of the cable itself, a part of the energy will be lost (generally very small), and the signal will be attenuated to a certain extent due to the electromagnetic wave's attachment effect and dielectric loss, but this has nothing to do with the shielding layer.
What is the meaning of SMA connectors?
The SMA-type RF coaxial connector was designed by Bendix and Omni-Spectra as an OSM connector in the late 1950s. It was one of the most commonly used RF/microwave connectors at that time. Initially, SMA connectors were designed for 0.141" semi-rigid coaxial cables and precision connectors for microwave applications in the military industry. They were filled with PTFE dielectric. Under the conditions at the time, due to the small size of SMA connectors, It can work at higher frequencies (the frequency range for mating semi-rigid cables is DC～18GHz; when mating flexible cables, it is DC～12.4GHz), and it is quickly popularized. Even the millimeter-wave connectors developed later (such as 3.5mm, 2.92mm) also consider the issue of mechanical compatibility.
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