Why Are Flexible Circuit Boards So Suitable for High-frequency Applications?

The demand for printed circuit board PCBs is increasing day by day with the development of technology, and the increase in demand for broadband and miniaturization of equipment has accelerated the application of PCB circuit boards. The correct choice of PCB circuit board type is the key to ensure complete and reliable system equipment. Among the three PCB types for high frequency applications, flexible PCBs have been found to be the best choice. Let TOPFAST explain today why flexible circuit boards are so suitable for high-frequency applications!

The advantages of different flexible PCB materials

Flex material.

High-frequency applications require thin-film circuit layers to remain consistent in order to be applied better, so in the subsequent development of circuit boards, various types of flexible polymer films have become indispensable materials in the development of PCB circuit boards. These films ensure the formation of thin and consistent flexible layers, which makes it the best choice for high-frequency applications.

Copper.

The process of flexible circuit board wisdom required in the same type of different from the conventional rigid circuit board, which is a major reason that makes flexible printed circuit boards suitable for high-frequency applications. Copper made by passing a large ingot through a series of rolls is very useful in the manufacture of flexible circuit boards. The rolling process also stretches and anneals the copper, resulting in large copper grains. In flexible circuit board applications, the large grain size makes copper more suitable for this type of board. Also, the copper is attached to the flex material by adhesive rather than brazing, which can easily break.

Dielectric.

This is a laminated resin that has good insulating and conductive properties. The dielectric contains a ceramic filler that acts as an adhesive and is bonded to the copper foil of the flexible circuit board. Flexible printed circuit boards usually consist of epoxy or acrylic adhesives. Both have a high relative dielectric constant at frequencies above 1 GHz. This is why flexible materials are used for high frequency applications, as they have a high dielectric thickness.

The above reasons prove that flexible printed circuit boards are the best type of board for high frequency applications.

It is a laminated resin with good electrical conductivity and insulating properties. The dielectric contains a ceramic filler, which is often used as an adhesive and is very widely used in bonding to the copper foil of flexible circuit boards. Flexible circuit boards made up of epoxy or acrylic adhesives Flexible printed circuit boards have a high relative dielectric constant for both at frequencies above 1 GHz. This is why flexible materials are used for high frequency applications, as they have a high dielectric thickness.

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