Introduction
The RP SMA Connector (Reverse Polarity SMA Connector) is a popular RF Coaxial Connector used largely for Wi-Fi antennas, wireless devices, IoT systems, and consumer RF equipment.
Although it looks like a regular SMA Connector, the internal pin layout is reversed, hence the name Reverse Polarity (RP) SMA.
RP SMA connectors are widely utilized in wireless LAN equipment, routers, antennas, and RF modules, where regulatory compliance previously required non-standard antenna interfaces.
What is the RP SMA Connector ?
An RP SMA connector is a 50-ohm threaded radio frequency connector with reversed gender pin configuration:
- RP SMA Male : The RP SMA Male connector has internal threads and a female socket interface.
- RP SMA Female : The RP SMA Female connector has exterior threads and a male pin interface.
This flipped design prevents ordinary SMA connectors from connecting directly.
Types of RP SMA Connectors
1. RP SMA Male Connector
- Internal threads
- Center socket contact
- Used for Wi-Fi routers and RF modules.
2. RP SMA Female Connector
- External threads
- Center pin contact
- Often found on Wi-Fi antennae.
3. RP SMA Bulkhead Connector
- Panel-mounted version
- Used for antenna enclosures and RF boxes.
4. RP SMA Right-Angle Connector
- 90-degree design.
- Suitable for small PCB layouts.
5. RP SMA Cable Assembly
- Pre-assembled coaxial cable with an RP SMA termination.
- Available for RG174, RG178, RG316, and other RF cables.
Key Features of the RP SMA Connector :
- Features include 50 Ohm impedance,
- Threaded secure locking mechanism,
- Compact size for RF modules,
- Good vibration resistance,
- Frequency support up to 6 GHz (typical),
- Straight and right-angle versions, and
- Gold-plated contacts to resist corrosion.
Technical Specifications :
| Parameter | Specification |
|---|---|
| Impedance | 50 Ohm |
| Frequency Range | DC to 6 GHz (typical) |
| VSWR | ≤ 1.2 – 1.3 |
| Contact Material | Brass / Beryllium Copper |
| Plating | Gold Plated |
| Insulator | PTFE |
| Coupling Mechanism | Threaded |
| Operating Temperature | -55°C to +165°C |
Applications For RP SMA Connector :
1. Wi-Fi Routers and Access Points
- Most consumer Wi-Fi devices have RP SMA antenna connectors.
2. WLAN Antennas
- External antennas for 2.4 and 5GHz systems.
3. Internet of Things devices
- Used in small wireless modules and embedded RF systems.
4. Automotive Telematics
- Vehicle Wi-Fi and telematics modules.
5. Wireless Communication Systems
- Small RF systems that require threaded secure connections.
Difference Between SMA Connector and RP SMA Connector :
| SMA Connector | RP SMA Connector |
|---|---|
| Standard polarity RF connector | Reverse polarity RF connector |
| Male connector has a center pin | Male connector has a center socket |
| Female connector has a center socket | Female connector has a center pin |
| Mates only with standard SMA | Does NOT mate with standard SMA |
| Common in RF test & telecom equipment | Common in Wi-Fi routers & WLAN antennas |
| 50 Ohm impedance | 50 Ohm impedance |
Key Difference Explained :
- In a normal SMA connector, the male connector features a central pin.
- In an RP SMA connector, the male connector has a center socket.
The inverted polarity avoids accidental connection to regular SMA antennas.
Why Choose an RP SMA Connector?
- Ideal for Wi-Fi and WLAN systems.
- Compact and dependable threaded RF solution
- Secure mechanical locking.
- High frequency stability.
- Widely available and affordable.
Conclusion
The RP SMA Connector is a dependable and small RF solution commonly used in Wi-Fi, WLAN, IoT, and embedded communication systems. While it resembles a typical SMA connector, its reversed pin layout distinguishes it and makes it useful for specialized applications.
Understanding the distinction between SMA and RP SMA connectors is critical for ensuring optimal compatibility and signal integrity in RF applications.
Contact Us
Eteily Technologies India Pvt. Ltd.
📫 Address: B28 Vidhya Nagar, Near SBI Bank,
📍 District: Bhopal, PIN: 462026, Madhya Pradesh
🌐 Website: https://eteily.com
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