Understand the SMA antenna connector thoroughly

SMA connector procurement telephone: 400-6263-698. If you are an employee in the connector industry, you should have heard about the SMA antenna connector. Since the sma connector product is a minority in our life, it is normal to be unfamiliar with it. So what is the SMA antenna connector and what is the difference between it and other connectors? In the following article, Deso Electronics Industrial Defense Division will give you a detailed introduction.

SMA connector At first glance, its name is easy to confuse people. But don't worry. Let's first learn about its functions. Let's take a look at the photos. I believe we can have a general understanding. By comparing, we can first understand the difference between it and other connectors. SparkFun needs to use SMA type connectors on several circuit boards that need some 50 ohm impedance to connect to external antennas (Bluetooth, cellular, GPS, XBee and Nordic). However, some boards use SMA connectors of different gender and polarity. Therefore, we need to match different antennas according to the gender or polarity of the RF connector. There are four different types of SMA connectors using gender combinations, of which gender refers to the center pin and polarity refers to the rotation characteristics.

The last two connectors are designed to be used together, but there is a problem with this configuration, and FCC has begun to move towards compliance with Part 15. This means that all SMA RF connectors are changing gender (center pin). For those of us who need to pair antennas with RF devices, this is really annoying. The gender change of FCC is to prevent home users from damaging RF devices when screwing the antenna (think of home WiFi). If all antennas are bus bars, the central connector cannot be damaged.

 

 

However, there is a polarity that all antennas, cables or anything are connected to a potential fixed object, which is connected with all fixed equipment using external nuts or internal threads. This is applicable to all SparkFun products. So all our antennas are SMA male or RP-SMA female. All our boards are SMA female or RP-SMA male.

The only change in compliance with the Part 15 standard is the change of the central pin, thus forming a "new" standard;. Reverse polarization SMA (RP-SMA). RP (reverse polarity) is named after its "thread gender" and has a needle of opposite gender. (Figure 2 above). If the circuit board is not connected to the u FL connector, SparkFun RF board and antenna will use the combination of old (SMA) and new (RP-SMA):

Cellular and GPS (900/1700/1800MHz and 1.57542GHz respectively) usually use the old standard. The antenna adopts SMA male type, and the module adopts SMA female type. Any 2.4GHz (Bluetooth, ZigBee, WiFi and Nordic) communication usually uses the new standard. RP-SMA male is used on the antenna and RP-SMA female is used on the module. In fact, we ignore gender issues most of the time. If you have an RP-SMA board or module, you need to match the corresponding SMA and RP-SMA antenna. Just make sure that the antenna frequency matches the circuit board.

The SMA antenna connector is one of the RF connectors. It is only a special male female interface, so it will be considered special by people. In fact, our parents' generation should have seen this product. As early as the 1980s and 1990s, the cable TV we watched at home was all this kind of interface. Of course, now our private home TV has been replaced by wireless digital technology. So I haven't seen many.

After reading the above, you can learn more about sma antenna There should be a comprehensive understanding of connectors. Deso Electronics will continue to edit, organize and publish more knowledge about SMA antenna connectors on the information channel to share with you. Deso Electronics, well-known in China RF connector The manufacturer has 16 years of experience in the production of sma connectors. The products have passed the ISO certification and meet the international environmental protection requirements. The warranty is free within one year. If you need to purchase sma products, you can directly call our free hotline: 400-6263-698, and professional engineers can answer your questions for free.

 

The pictures used in this article, "Understanding SMA Antenna Connector Thoroughly", are all taken by Deso's photography team in HD, and are only for our users to view. Please do not reproduce them for commercial purposes. Thank you for your cooperation.