According to the current connector market, the background and driving force of the board to board connector being more and more widely used come from the two development trends of wireless device Market: smaller size and lower price. As we can see in the wireless terminal market, smaller, lighter and cheaper are also the development trend of wireless device market. The reduction of equipment size means that it can save space, reduce weight and leave more margin for other design of the system. The continuous reduction of equipment size requires that the integration degree of all devices in the equipment is higher and smaller, which also includes the RF coaxial connectors and cable components widely used in the RF modules and interconnection between them.

For example, the RRH (remote radio head), which is widely used in the distributed base station system, must be very compact in design and try to control its size in order to be installed in the tower top and the city dense environment simply, conveniently and reliably, which requires the coaxial interconnection system carrying its RF signal transmission to be more concise and compact. The traditional complex cable component connection is being replaced by the simple, compact and reliable "board to board" coaxial connector connection which can carry more than 100W RF signal power at the same time.

Now more and more RF and structural design engineers are more and more familiar with board to board. More and more designs are using board to board connector connection, which makes designers think more about the cost. The market needs to design a simpler and lower cost board to board connector scheme.

There are two main challenges in the mechanical structure design brought by the continuous reduction of connector size: first, compared with the large-scale connector, the small-scale connector is more difficult to match and align. Second, the mechanical strength of small size connector is low, and it is easy to be damaged if not used properly. Generally, large-size connectors can withstand the use of large mechanical force in the fit without damage, but small connectors need to be more accurate in the fit.