Flexrigid Be Used in High-Frequency Applications

Unlike rigid PCBs, which are rolled up from a large sheet of copper and plated to form traces and connections, flex circuits are formed in smaller rolls of coated films. This allows flex boards to be produced with extremely uniform base dielectric thicknesses, which reduces signal loss and improves impedance control. The flexibility of a flex board also provides additional space to place components and reduce weight.

The high-frequency capabilities of a flex circuit can be enhanced by the use of thinner, narrower copper traces. The narrower traces allow for higher speed data transmission and more efficient power delivery, while still maintaining proper conductor resistance. This allows a flex circuit to operate at higher frequencies than a rigid or traditional PCB. In addition, a flex circuit can eliminate the need for connectors, which typically require extra wires and add to system weight. The reduced signal lengths and impedance discontinuities of a flex circuit make it ideal for a variety of high-speed and high-frequency applications.

Rigid-flex PCBs excel in maximizing space utilization within electronic devices, including mobile phones and tablets. The combination of rigid and flexible sections allows designers to route traces and components in ways that would be impossible with rigid or standard PCBs. This is especially valuable in smaller, compact device applications where every millimeter counts.

Can Flexrigid Be Used in High-Frequency Applications?

In order to optimize the performance of a flex-rigid PCB, it is important to follow IPC-2223 Design Guidelines. This includes routing all traces perpendicular to the bend, avoiding vias and plated through holes in the bend area, and keeping flex-rigid features at least 40mils away from the transition zone between the rigid and flex areas.

For example, many products that are shipped and stored in warehouses rely on modern electronics to scan items, track and report on their movement and to process orders. These devices are small, portable and need to be able to handle the rough conditions that are common in many warehouses. Flex and flex-rigid PCBs are ideal for these applications as they can be easily shaped to fit inside the case, providing the necessary stability and durability to survive in harsh environments.

To maintain a good bond between the rigid and flexrigid portions of the PCB, it’s critical to properly pre-bake the assembly. This will reduce the amount of moisture that is absorbed during reflow soldering. In addition, it’s important to keep vias, plated through holes, and special copper features at least 40mils away from the transition zone.

Choosing the right PCB material for your design is critical. You should work with engineers and PCB manufacturing designers to understand your project’s goals before selecting a material that is best for your application. Once the materials are selected, we can help you create your flex-rigid PCB using our extensive fabrication and assembly capabilities. Contact us today to get started!