Widely used in antenna, communication system, radio frequency components, and other fields, mainly used in a variety of built-in antenna feeder miniature electronic devices, such as global positioning system (GPS) inside the car audio, satellite radio, laptops and mobile phones, etc
UHF connector that appeared in 1930 is the earliest RF connector. Arrived during world war ii, due to the needs of the war, with the development of radar, radio and microwave communications, the N, C, BNC, TNC, medium-sized series, 1958 years after the SMA, SMB, SMC and other small products.
Common coaxial connector choice: BNC is bayonet, usually for less than 4 GHZ rf connection, widely used in instrumentation and computer networking.
TNC is a threaded connection, size, etc, similar to BNC, working frequency can reach 11 GHZ, thread type suitable for vibration environment.
SMA is a threaded connection, the most widely used, the impedance of 50 and 75 ohm, 50 ohms with soft cable, use frequency is less than 12.4 Ghz with semi-rigid cable up to 26.5 Ghz.
SMB volume less than SMA, is inserted into the locking structure, for fast connections, is often used in digital communications, is Mr Sternbach L9, 50 ohm to 4 GHZ, 75 ohms to 2 GHZ.
SMC for the threaded connection, other similar SMBS, there is a wide frequency range, often used for military or high vibration environment.
N type connector as the thread type, air for insulation materials, low cost, up to 11 GHZ frequency, often used to test instrument, which has two kinds of 50 and 75 ohms.
MCX and MMCX connectors is small in size, used for intensive connection.
The BMA is used for low power for up to 18 GHZ frequency microwave system Blind plug connection. Each connector has the standard and commercial standard, military standard according to MIL - C - 39012, copper parts, teflon insulation, all inside Outer gold-plated, performance is the most reliable, but the cost is higher.
Commercial standard design is using cheap materials, such as yellow copper body, polypropylene insulation, silver plating Etc., the reliability is less. Connectors are of brass and beryllium copper and stainless steel material, the center conductor general gold-plated, to ensure low resistance and corrosion resistance.
Military standard requirements on SMA and SMB gold-plated, silver plated on N, TNC, BNC, because of easy oxidation of silver, users prefer nickel plating.
Insulation materials have four Fluoride and toughening polystyrene, polypropylene, including ptfe insulation performance is best, but the cost is higher. Edit this paragraph 3, the RF connector development trend
With the miniaturization of the whole system miniaturization, RF connector size smaller and smaller, such as SSMB, MMCX series, volume.
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