Cavity printed circuit boards

Using space more efficiently

The devices and electronic circuits that facilitate the digital side of our day-to-day lives have to perform increasingly complex tasks at breathtaking speed. One of the key areas of potential for the further development of such systems is miniaturisation, in which increasingly complex circuits are packed onto printed circuit boards in ever denser configurations, so that they require less and less space.

At AT&S, we no longer use just the surface of printed circuit boards for this, but also integrate components into the inner layers. This uses the space of a printed circuit board to the max and makes miniaturised devices such as medical implants and smartphones possible.

Product benefits at a glance

  • Cavities allow miniaturisation in PCB technology to go one step further.
  • Miniaturisation using cavities is relatively cost-effective compared to other approaches.
  • Cavities can be positioned flexibly and easily adapted to the components or new systems.

2.5D – in depth lies strength

As printed circuit boards shrink, the surface area available for traces and components decreases with it. That’s why AT&S is making the most of the space within multilayer circuit boards in its latest high-tech versions. These use 2.5D® technology to remove parts of individual layers of a printed circuit board to create cavities. Components such as resistors, microcontrollers or heat sinks can then be placed in the cavities.

AT&S uses 2.5D technology to make the most of limited space

The cavities are created in a high-precision laser process, and can be designed in any shape. Adjusting the laser beams ensures top-quality surfaces that put as little stress as possible on the processed material. The components housed in the cavities are also well protected inside the circuit board at all times.

Smartphones and driver assistance systems

Removing unneeded circuit board layers reduces losses in high-frequency signals in high-frequency antenna circuit boards, which is particularly important for antenna structures. So printed circuit boards with cavities are very well suited to wireless communication applications such as smartphones and their infrastructure. The waste heat from heat-generating components can also be better managed through the targeted removal of material.

AT&S Cavity PCB applications
Cavities allow antennas and signal processing systems to be accommodated within the smallest of spaces – essential for wireless communication.
AT&S Cavity PCB applications
Designers can use cavities to make sensors for cameras and laser scanning smaller and more efficient.
AT&S Cavity PCB applications
Printed circuit boards that work in tiny spaces can be designed with cavities.
Cavity printed circuit boards clear the way for a high-frequency future


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