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Multilayer Rigid-flex PCB

Multilayer Rigid-flex PCB

Multilayer Rigid-flex PCB has more than two conductive layers of any one of more than two substrates. The substrate acts as an insulator between each other. The basic design concept and manufacturing process of multilayer rigid-flex boards are developed from aerospace equipment, because reliable wiring must be carried out in a limited space. In some complex products, even rigid-flex boards with more than 30 conductor layers are used. On the other hand, in consumer electronics products, such as mobile phones and digital cameras, high-density, low-cost wiring technology has always been required, so new design concepts and manufacturing processes have emerged. Multilayer rigid-flex circuits have many high-performance benefits, including bendability, connection reliability, package size and weight reduction, and flexible design.

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Our Beton Factory has helped customers produce many rigid-flex boards. The following multi-layer rigid-flex board stacks are some of our typical cases.


4 layers Rigid-flex pcb stackup with EMI Shield film 

This multilayer Rigid-flex circuit Stackup requires an EMI or RF shielded flex section. This EMI Shield film can achieve very effective EMI and RF shielding without increasing the copper layers cost, and has the reduced cost benefits and thinner flexible structure to increase flexibility.


The flex area cover has multiple selective openings to expose ground circuits. These EMI Shield films have a conductive adhesive so that once laminated, the adhesive extends into the coverlay opening and bonds to the exposed ground, grounding the shield.


This is1+2+1 rigid-flex pcb and combined with 1 rigid circuit, 2 flex circuits and 1 rigid circuits. We can see the shield laminated to the outside of the coverlay in the flex area,which is a more cost-effective solution than adding an extra copper layer, and this stackup greatly increases the flexibility and mechanical bendability of the flex layer.

And the 4 layers rigid-flex board material isFR4+PI+EMI Shield film. Theflexible part is 0.1mm, rigid part can be 0.8-1.6mm and the EMI Shield film is 0.018mm.


6 layers Rigid-flex pcbstandardstackup

A standard rigid-flex PCB design stackup has a symmetrical structure. This type of symmetrical design also allows for impedance control.


As the bellow 6 layers rigid-flex pcb stackup, the flex layer is in the center of the structure, with an even number of layers in the rigid and flex areas. In the two thicker rigid regions, the number of layers is even. In a rigid-flex board example like this one, there can be six layers, or it can go from four to sixteen or more layers. The key point of this rigid-flex circuit stackup is that the flex layer is in the center of the structure.


7layers Rigid-flex PCB stackup with odd number layer

The following is an odd-numbered-layer rigid-flex board stackup. In the manufacture of general rigid-flex boards, the design of rigid-flex circuit boards with uniform layers is required. While an odd number of layers is an uncommon design, our Rigid-Flex factory is manufacturable and has its own set of advantages. This 7 layers Rigid-flex PCB provides great flexibility and reduces costs.



8 layers Asymmetric Rigid-flex PCBstackup

This rigid-flexible PCB structure is an asymmetrical stackup design. Multilayer rigid-flex PCB applications with asymmetric structures are often driven by some very complex impedance requirements, and this type of multilayer rigid-flex PCB exists widely varying dielectric thickness requirements. These may also be caused by the blind via, and this asymmetrical design structure can be allowed to reduce the aspect ratio of the blind via, to improve the unit's manufacturability and reliability.

Because this asymmetrical stackup is an unbalanced build, so in the assembly array may appear some warp and twist. Therefore we need  to compress fixture to allow the assembled array to be transported during the assembly process.


This multilayer rigid-flex PCB satckup is an 8 layer rigid-flex PCB  with asymmetric. This flex layer is not in the center of the design like a standard rigid-flex stackup and moves down toward the bottom. This type stackup is still in a manufacturable configuration. Besides some warping and twisting might be induced in the assembled array, not any other manufacturing issues.


Other Type multilayer rigid-flex pcb stackup

6 layers Rigid-flex PCB stackup with different flex layers

Other types of multilayer rigid-flex stackups differ in the number of flexible layers between rigid parts. That is, there are three rigid sections, and then there may be three or four flexible layers connecting the first and second rigid sections, but only one or two layers connecting the second and third. There are many configurations of these different flex layer structures, but we recommend using air-gapped flex layer structures for this type of design.This 6 layers Rigid-flex PCB stackup shows different flex layers. There are four Flex layers between the first and second rigid sections, but only two layers of flexibility between the second and third rigid layers. L2 and L3 are flexible layers, although they do extend to the rigid section for routing purposes, these flexilble layers do not span the two sections. The main advantage is that reduced bending part, because the number of interconnects does not need additional layers, and reducing to only two bending layers significantly improves the bending ability of this structure.

Multilayer rigid-flex pcb Material

Material Traditional Material High Performance Materials
Flexible Copper Clad Laminate(FCCL)Traditional polyimide filmNew Polyimidefilm
Copper Clad Laminate (Double Sided)Polyimide substrate, acrylic adhesive (epoxy adhesive)

Non adhesive polyimide based laminate

 (cast or laminated)

CoverlayTraditional polyimide coated acrylic or epoxy adhesiveNew Polyimide Coated Hot Melt Polyimide Adhesive
Adhesive sheet

Acrylic resin film, epoxy resin film, polyimide film

 coated with acrylic adhesive on both sides

New polyimide film coated with hot-melt polyimide 

resin on both sides

Copper Clad Laminate(CCL)Glass-Epoxy(FR4)Glass-BT resin board, Glass-polyimide resin board

Multilayer Rigid-flex circuit board is a circuit board with FPC characteristics and PCB characteristics after being combined according to relevant process requirements after lamination of flexible circuit boards and rigid circuit boards. The development prospect of multilayer Rigid-flex circuit board is very impressive. However, the manufacturing process of rigid-flex boards is more complicated, and some key technologies and difficulties are difficult to control. Please see the following 6 layer Rigid-flex circuit board manufacturing process.

With the increasing demand for flexible and more complex electronics, multilayer Rigid-Flex PCBs are popular inmany applications.

Multi-layer rigid-flexible PCB circuit board engineering is especially suitable for portable electronic products and wearable devices. Due to its small number of connection points, it can improve product performance and meet the needs of the current market


Ÿ Rigid-Flex PCBs for the Medical Industry

The multilayer Rigid-Flex PCB is used in the manufacture of medical wearables due to its ability to fit in small devices. Including pacemakers and cochlear implants, but also applicable to the manufacturing process of other medical devices: imaging devices and handheld displays, etc.

Ÿ Rigid-flex PCBs in military equipment

Military equipment has been manufactured using multilayer Rigid-Flex PCBs. This is due to the reliability offered by the Rigid-Flex circuit and its resistance to various fluctuating environmental conditions. Can use in weapon guidance systems and communications equipment. Also used in tracking and surveillance systems and other applications.

Ÿ Rigid-Flex PCBs in the Aerospace Industry

As in the military industry, equipment in the aerospace industry is also exposed to harsh environmental conditions. Multilayer Rigid-Flex is used in the manufacture of radar equipment and radio communication systems. Noise and vibration test systems are also fabricated using multilayer Rigid-Flex PCBs.

Ÿ Rigid-Flex PCBs in the Telecom Industry

The telecommunications industry also requires rigid-flex PCBs for efficient operation. Because of the fact that multilayer Rigid-Flex boards can withstand thermal changes. Applications include routers and servers, communication satellites and handheld devices. Others include base stations and wireless communications equipment.

Ÿ Rigid-Flex PCBs in the Automotive Industry

Small devices are best fabricated using multilayer Rigid-Flex circuit boards. In the automotive industry, many small devices are installed. These include the electronic control module and the comfort control unit, the music system and the LCD display. Navigation system and transmission controls.

Ÿ Rigid-Flex PCBs in Industrial control

Multilayer Rigid-Flex PCBs are also used in the manufacturing industry to make many devices. These include automation systems and industrial air conditioners, electrical switches and control panels, CCTV surveillance systems.

Ÿ Rigid-Flex PCBs in Consumer Appliances

A variety of consumer appliances are made using multilayer Rigid-Flex rigid-flex PCBs. Including electronic iron, lighting system and washing system, remote control for TV and UV water purifier.


If your have multilayer rigid-flex circuit needs, please contact me at We have the professional and experienced engineer team to help you.


HongHai Building, SongGang Street, BaoAn District, ShenZhen City, China.

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BETON Rigid-Flex PCB facotory products are widely used in communication equipment, industrial control, automotive, medical equipment, security electronics, consumer electronics, aerospace and other high-tech fields.

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