With the development trend of miniaturization of connectors, ultra-miniature connectors have been further reduced, and connector suppliers have developed ultra-miniature coaxial connectors.
MCX (MicroCoaX, brand name of Haoxun/Hubersuhner) was developed in Europe in the 1980s. The structure is very similar to SMB-the structure of the inner conductor and the overlapping insulator is exactly the same as that of the SMB. It also uses a snap connection structure, but it will The center positioning structure of the conductive shrapnel is turned outwards. This makes the size of the MCX much smaller.
The reliability of the MCX is no less than that of the SMB, but the shape and weight are about 30% smaller. The 50 ohm MCX can work in a 6GHz environment, and it can work in a traditional SMB It provides more space for the occasions, and its basic functions are similar to SMB, and there is a trend to replace SMB. MCX applications include GPS (Global Positioning System), automobiles, mobile phones and data communications.
MMCX (Micro-MCX) was developed in Europe in the 1990s, and it is also used for quick plugging, but it is 45% smaller than SMB, and the male and female connectors can rotate freely relative to 360° during operation so that the signal will not be affected. Intermittent, ideal for applications such as micro-antennas. The BMA series is also called blind-mate connectors. Its fixed sockets have a certain amount of floating in the axial and radial directions, which can realize a modular, modular system and fast blind-mate replacement. , Mainly used in military products and CDMA communication equipment. Operating frequency is 0～22GHz. The internal nominal size and matching cables are the same as SMA. SAA series (DIN47297) is a push-in self-locking connector, available in 50Ω and 75Ω.
At present, it is widely used in communication systems such as program-controlled switches and optical transceivers in China. The structural characteristics of the SSMA series are similar to SMA, but the size is smaller, and the working frequency can reach 40GHz. It is currently the only universal standard millimeter wave connector. The structural characteristics of the SSMB series are similar to SMB , The volume is smaller, and it is commonly used in military radio stations.
Other ultra-miniature RF coaxial connector series include SSMC, SMP, MC-card, MHF.
