Introduction to Board-to-Board Connectors

According to the current connector market, the background and driving force of board-to-board connectors being more and more widely used comes from two major development trends in the wireless device market: smaller size and lower price. As seen in the wireless terminal market, smaller, lighter and cheaper are also the development trends of the wireless device market. The reduction in the size of the device means that space can be saved, weight can be reduced, and more excess can be left for other design of the system. The continuous reduction of equipment size requires all devices in the equipment to be more and more integrated and smaller in size. This also includes RF coaxial connectors and their cable assemblies that are widely used in and interconnected RF modules.

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In order to make RRH (remote radio head), which is widely used in distributed base station systems, simple, convenient and reliable installation at the top of towers and dense urban environments, its design must be very compact, and its size must be controlled as much as possible, which requires that the coaxial interconnection system carrying its radio frequency signal transmission must be more concise and compact. Traditional complicated cable assembly connections are being replaced by simple, compact, reliable "board-to-board" coaxial connector connections that can carry more than 100W of RF signal power at the same time. Nowadays, more and more RF and structural design engineers know more and more about board-to-board connectors, and their familiarity is getting higher and higher. More and more designs are using board-to-board connector connections, which makes designers have more and more considerations about cost, and the market needs to design simpler and lower-cost board-to-board connector solutions.

The decreasing size of connectors brings two main challenges in mechanical structure design: First, compared with large-size connectors, small-size connectors are more difficult to match and align. Second, the mechanical strength of small-size connectors is low, and it is easy to be damaged if used improperly. Generally, large-size connectors can withstand large mechanical forces when mating without damage, but small connectors need to be more accurate when mating.

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