When it comes to the structure of FFC Connectors, there are a couple of basic constructions although these contain significant variations between the types with regards to the construction of the connector itself. Here are some of the structures:

Single-sided Circuits

                FFC connectors with single-sided circuits contain a single conductor layer made up of conductive or metal polymer placed on a flexible dielectric film. Any features regarding the component termination is accessible from one side only. The holes can be formed on the bottom film on order to allow the component that leads to pass into the interconnection; this is done through the process of soldering. It is possible to fabricate single sided circuits with or without adding a protective coating; the protective coating acts as a cover and they are typically added to the single-sided circuits.

Back Bared or Double Access Circuits

Back bared circuit, also called the double access circuit, are flexible circuits that feature a single conductor layer. The difference from the one before is that the back bared circuit is processed in a way that allows access to certain features of the conductor patter form either side. Of course this type of circuit offers its own benefits, but due to the required specialized processing, the features are limited.

Sculptured Flex Circuit

                In reality, the sculptured flex circuit is a novel subset of any typical flexible circuit structures. During the manufacturing process, a special kind of flex circuit etching method is used which can yield a flexible circuit containing copper conductors. Along the entire length of the conductor, the thickness will vary.

Polymer Thick Film Flex Circuit

Polymer thick film flex circuits contain conductors that are actually printed on a polymer base film. Typical, they’re single conductor layer structures but at least two metal layers are printed sequentially alongside an insulating layer.