RF Connector – RP SMA Connector Introduction

RF Connector – RP SMA Connector Introduction

RP (Reverse Polarity) SMA connector is non-standard version of SMA Connector, and RP SMA connector is developed based on the regulations of FCC for limited purpose of connecting between Wi-Fi and WLAN systems.

In WLAN systems, RP SMA Connector is designed with 50 ohm and demanded working frequency is up to 6GHz. RP SMA male connector has female center contact, and RP SMA female connector has male center contact.

Plenty of RP SMA Connectors, RP SMA Adaptors, various RP SMA Cables and RP SMA Antennas are used in various WLAN devices, and RP SMA Connector is the most popular among various RP RF connectors.

Mechanical Feature:

RP SMA male

  • Inner thread of 1/4-36UNS-2B inside the coupling nut, and the ID is from 5.588~5.740mm
  • SMA Male is equipped with 8mm hex coupling nut allowing to torque by wretch.
  • A silicon rubber O-ring is embedded between outer contact and coupling nut
  • An air gap between center contact and coupling nut
  • Female center contact

RP SMA female

  • 4.32mm length thread for mating purpose, and the outer thread’s OD is 6.187~6.327mm
  • Insulator surrounds center contact wholly
  • Male center contact

How to judge RP SMA connectors’ feature from outline:

RP SMA connector Male (Plug)

RP SMA connector Male (Plug)

RP SMA Male connector has female pin, and is equipped with 8mm hex coupling nut which has inner thread inside. A silicon rubber Oring is embedded between outer contact and coupling nut.

RP SMA connector Female (Jack)

RP SMA connector Female (Jack)

RP SMA Female connector has male center contact, and has outer thread of dia. 6.25mm, 4.32mm length for coupling purpose.

RP SMA connector right angle type:

RP SMA connector right angle type

The cable entry way is at 90 degrees against coupling way.

RP SMA connector straight type:

RP SMA connector straight type

The cable entry way is at 180 degrees to coupling way.

RP SMA connector female/ jack bulkhead type:

When thread length is much longer than around 4.3mm and it is equipped with washer and nut, we can definite the RP SMA Connector is bulkhead mount type. Bulkhead means the connector can be mounted on wall or panel with washer and nut.
1) Rear mount type bulkhead

RP SMA connector Rear mount type bulkhead

RP SMA Connector rear mount bulkhead type will go through the panel mounting hole toward the external of device from the internal, and mount it with washer and nut from outside.

2) Front mount type bulkhead

RP SMA connector Front mount type bulkhead

RP SMA Connector front mount bulkhead type will go through the panel hole toward the internal of device from the external, and mount it with washer and nut from inside.

RP SMA Connector female Bulkhead w/O-ring

RP SMA Connector female Bulkhead w/O-ring

A sealing O-ring is embedded inside the hex flange. After mounting onto panel sheet with washer and nut, the O-ring can resist dust and moisture.

RP SMA male / female 2holes flange mount

RP SMA male / female 2holes flange mount

2 thru holes on connector flange.
The flange is exposed outside. Two screws are inserted into and have nuts to fix from the internal of enclosure.

RP SMA male / female 4holes flange mount

RP SMA male / female 4holes flange mount

4 thru holes on connector flange.
The flange is exposed outside. Four screws are inserted into and have nuts to fix from the internal of enclosure.

RP SMA connector PCB connector:

RP SMA connector PCB connector

PCB type RP SMA connector normally has 2.9mm or 3.9mm leg lengths. Four legs and one conductor will go through PCB vertically, and be soldered in rear side of PCB.

RP SMA connector edge mount (end launch)

RP SMA connector edge mount (end launch)

RP SMA edge mount connector will be mounted with the PCB from board’s edge side