A flexible printed circuit comprises of multiple outlines of conductive traces that are bonded on a base i.e. a flexible substrate. Flexible circuit boards are enabled to an extended freedom when it comes to the packaging geometry. Even after providing maximum flexibility with the geometry it retains the accuracy density and repeatability of printed circuit. A conventional flexible circuit board is built up of ordinary PCBs and round wire, both of them complementing each other. They count in as substitutes for wires and wire assemblies, in-turn saving costs and providing a better quality of performance. There are a few different types of flexible circuit board construction designs; they vary according to the purpose they are supposed to serve. Here are some basic types of flexible circuit boards:

1. Types of flexible circuit design

2. Introduction
 A flexible printed circuit comprises of multiple outlines of conductive traces that are bonded on a
base i.e. a flexible substrate. Flexible circuit boards are enabled to an extended freedom when it
comes to the packaging geometry. Even after providing maximum flexibility with the geometry it
retains the accuracy density and repeatability of printed circuit. A conventional flexible circuit
board is built up of ordinary PCBs and round wire, both of them complementing each other.
They count in as substitutes for wires and wire assemblies, in-turn saving costs and providing a
better quality of performance.
 There are a few different types of flexible circuit board construction designs; they vary according
to the purpose they are supposed to serve.
Here are some basic types of flexible circuit boards:

3. Single-sided flexible circuit
 Single-sided flexible circuits comprise of only
one conductor layer, this layer is either made
of metal or conductive polymer on a flexible
dielectric film. The component execution
features are only available from one side. The
holes are created in the base film to allow the
component leads to pass to provide
interconnection. This is usually done by the
method of soldering. Single sided flex circuits
do not require protective coatings like cover
layers or cover coat, they can be fabricated
with or without their presence. Even if not
required, the use of a protective coating above
circuits is a common practice to ensure extra
security.

4. Double-sided flexible circuit
 When it comes to double-sided flexible
circuits, it is well stated by the name that they
have two conductor layers unlike the single-
sided flex circuit. The fabrication of these
circuits can take place with or without holes;
the plated through hole variation is much more
generic. The circuits that are constructed
without plated through holes, the association
features are accessible only from one side. A
double sided flex circuit can be fabricated with
protecting cover layers in one, both or neither
side of the finished circuit. In a common
practice, the protecting layers are added on
both sides of the flex circuit. A major benefit of
double sided circuits is that it enables intersect
connections to be prepared very easily.

5. Sculptured flexible circuit
 Sculptured flex circuits are quite different from the typical flexible circuit structures. The
extensive procedure involved in the manufacturing includes a multi-step etching method
which leads to a flex circuit with finished copper conductors. These conductors do not have a
defined thickness; it keeps varying throughout the length of the circuit board. Basically, the
thin part is the flexible are and the thick parts are the interconnection parts.

6. Multilayer Flexible Circuits
 As the name suggests, these flex circuits have three or additional layers of conductors. These
layers are interconnected by means of plated through holes, even after this process, it is
possible to supply openings to access the lower circuit level features. The layers of the
multilayer flex are not mandatory to be laminated mutually; this could or could not be
needed. It depends on the usage of the circuit board. Irregular lamination is often found in
cases where utmost flexibility is to be achieved.

7. Conclusion
 To sum it up, the above mentioned are the most common and well-known flexible circuit
boards out of the multiples types that are used in the electronic devices. Out of the above
the sculptured circuit is the most unique as it differs according to the requirement of the
electronic device, whereas single-sided and double-sided are the most commonly used
circuit designs.

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