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SMA and Reverse SMA

RP SMA und SMAThe difference between a classic connector and its reverse version can often lead to confusion. Therefore, in this article we will go into the origins and differences of these connector types using the example of an SMA connector.

The difference between a classic connector and its reverse version can often lead to confusion. Therefore, in this article we will go into the origins and differences of these connector types using the example of an SMA connector.

An SMA connector (SMA = Sub-Miniature Version A) is primarily used for applications in frequency ranges from 1GHz to 18 / 26.5 GHz (depending on the version). The characteristic impedance is usually 50 Ohm.
An SMA plug has a union nut with a pin as the inner conductor. The SMA socket is equipped with an external thread and metal tube as the inner conductor.

The RP-SMA connector (RP = Reverse Polarity) is externally the same as the SMA connector, but the RP-SMA connector (also called Reverse SMA) has a small metal tube as the inner conductor, whereas the RP-SMA socket has a pin. The inner workings of the connectors are therefore reversed, whereas the housing is the same as the classic design (RP-SMA plug: internal thread; RP-SMA socket: external thread).

Originally, this variant was developed so that no SMA connector could be connected to a stronger antenna, but it has now established itself in several areas. Areas of application for reverse SMA connectors are, for example, antenna connections on WLAN devices, GPS antennas or in the automotive sector.

However reverse connectors are not only available as SMA variants; for example, this type also exists in the field of TNC and BNC connectors.

Since an ordinary connector is not compatible with a reverse connector, simply because of the different design, it is advisable to seek an expert opinion if you are unsure.

 

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