RF Connectors?


Xmultiple's Engineering Department

A coaxial RF connector is an electrical connector designed to work at radio frequencies in the multi-megahertz range. RF connectors are typically used with coaxial cables and are designed to maintain the shielding that the coaxial design offers.

Standard Types of RF Connectors

1. 7/16 DIN connector, a high power 50 [ connector originally developed by Spinner[2]

2. BNC (bayonet Neill-Concelman)

3. F connector, used for domestic television installations and domestic satellite LNBs (75 [) world wide.

4. HN connector, a high voltage version of the N connector.

5. N connector (Neill). The N connector (in full, Type N connector) is a threaded RF connector used to join coaxial cables. It was one of the first connectors capable of carrying microwave-frequency signals, and was invented in the 1940s by Paul Neill of Bell Labs, after whom the connector is named.

6. TNC connector (threaded Neill-Concelman). The TNC (threaded Neill-Concelman) connector is a threaded version of the BNC connector. The connector has a 50 [ impedance and operates best in the 0V11 GHz frequency spectrum. It has better performance than the BNC connector at microwave frequencies. Invented in the late 1950s and named after Paul Neill of Bell Labs and Carl Concelman

7. Twin lead

8. UHF connector (e.g., PL-259/SO-239). Also referred to as an M-type connector by Japanese manufacturers such as Kenwood.

Miniature types

1. Miniature BNC connectors
2. Miniature UHF connectors
3. DIN 47223 connectors
4. IPX connector
5. SMZ connector - System 43 (BT43 and High Density HD43) for use in DDF

Sub-miniature types

1. MMCX connector. MMCX (micro-miniature coaxial) connectors are coaxial RF connectors similar to MCX but smaller. They conform to the European CECC 22 000 specification.
The connectors have a lock-snap mechanism allowing 360-degree rotation and usually have a 50 [ impedance. They offer broadband capability from DC to 6 GHz.[1]
MMCX connectors are most commonly seen on Wi-Fi PCMCIA cards as antenna connectors or as connectors for external GPS antennas on small devices like PDAs or GPS receivers. They were developed in the 1990s.

2. MCX connector. MCX (micro coaxial) connectors are coaxial RF connectors developed in the 1980s. They have the same inner contact and insulator dimensions as the SMB connector but are 30% smaller. MCX is standardized in European CECC 22220.[1]
They use a snap-on interface and usually have a 50 [ impedance (occasionally 75 [ also) . They offer broadband capability from DC to 6 GHz.[2] The contact surfaces are gold-plated.
This type of connector is used on the Apple Airport Extreme Base Station's external antenna port and requires an adapter for most antennas. MCX and the smaller MMCX connector are frequently used to connect external antennas to GPS receivers.
The outer diameter of the plug is approx 3.6 mm or 0.140 inch.

3. FME connector. FME (For Mobile Equipment)is a miniature 50[ RF connector series offering excellent performance from DC to 2.0 GHz used with primarily with RG-58 or equivalent coaxial cables employed in mobile applications and installations. The FME female is designed to allow cables it has been installed on to be snaked through the often tight access holes or spaces of a vehicle to the desired equipment location(s) where an FME male adapter to the required equipment connector series is fitted to the female cable connector. There is an extensive array of FME inter-series adapters available and a male cable connector is also offered for both RG-58 and RG-174 type cables to facilitate extensions, splices or transitions.

4. SMA connector, including variants: 3.5 and 2.92 mm connectors, which cross-mate with SMA, and 2.4, 1.85 and 1.0 mm connectors, which do not cross-mate with SMA

5. SMB connector. SMB (SubMiniature version B) connectors are coaxial RF connectors developed in the 1960s. SMB connectors are smaller than SMA connectors.
They feature a snap-on coupling and are available in either 50 [ or 75 [ impedance. They offer excellent electrical performance from DC to 4 GHz.
Connectors are available for two SMB cable sizes:
1.Cable 2.6/50+75 S (3 mm outer / 1.7 mm inner diameter) and
2.Cable 2/50 S (2.2 mm outer / 1 mm inner diameter)

6. SMC connector

7. SMP connector


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