What are the types of FR4 PCBs?

Here are some types of FR4 PCBs:

Single-sided FR4 PCB: This type of PCB has a single layer of copper conductive traces on one side of the FR4 substrate.

Double-sided FR4 PCB: These PCBs have copper conductive traces on both sides of the FR4 substrate, allowing for more complex circuit designs and increased component density.

Multilayer FR4 PCB: Multilayer FR4 PCBs consist of multiple layers of FR4 substrate with copper conductive traces sandwiched between them. The layers are interconnected through vias, allowing for intricate and compact circuit designs.

High-frequency FR4 PCB: These PCBs are designed specifically for high-frequency applications, where signal integrity and low loss are crucial. They have special impedance-controlled traces and optimized dielectric properties to minimize signal degradation.

Flexible FR4 PCB: Flexible FR4 PCBs are made with a flexible FR4 substrate, allowing them to bend and conform to different shapes. They are commonly used in applications where space constraints or flexibility requirements exist.

Rigid-Flex FR4 PCB: Rigid-flex FR4 PCBs combine the advantages of rigid and flexible PCBs. They consist of both rigid FR4 sections and flexible FR4 sections, offering a combination of structural stability and flexibility.

It's important to note that FR4 is a generic term for a type of laminate material, and the actual PCB types can vary depending on the specific design requirements and manufacturing processes used.