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Your PCB substrate: a guide to materials

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  • Your PCB substrate: a guide to materials

    Your PCB substrate: a guide to materials



    Essentially, the materials of a printed circuit board (PCB) contain the transmission lines and components that enable radio frequency/microwave circuits. Therefore, it’s easy to see why materials are important to the success or failure of your PCB; your materials impact thermal behaviour, as well as the electrical and mechanical characteristics of the circuit.To get more news about BT PCB, you can visit pcbmake official website.

    PCBs are generally made of silkscreen, solder mask, copper and substrate. It’s the substrate that offers so many choices.You now have more to choose from. With the boom in electronics, circuit materials are now available for specific applications, such as antennas, or even frequency ranges, e.g. millimetre-wave frequencies.

    Still, the base substrate for most PCB materials tend to fall into the same categories as before: hard/rigid or soft/flexible.These PCBs are made out of a solid substrate material that prevents the board from bending. Take, for example, a computer motherboard, perhaps the most common application for a rigid PCB.

    The motherboard is a multilayer PCB. It’s designed to allocate electricity from the power supply while at the same time, enabling communication between all of computer’s parts, such as CPU, GPU and RAM. Hard, or rigid materials, are used whenever the PCB has to retain the shape it was set up to be, for the device’s lifespan.To enable a PCB to flex and move, plastic is often used. Like rigid PCBs, flexible PCBs can be made in single, double or multilayer formats. They can be folded over edges and wrapped around corners.

    It’s because of flexible materials that wearables are possible, allowing printed circuitry to insert into compact spaces. Flexible materials save on cost and weight, but they tend to cost more for fabrication.

    One advantage to flexible materials is that they can be used in areas with environmental hazards. Flexible materials can be waterproof, shockproof or corrosion-resistant, for example – that’s not a feature that most rigid PCBs can offer.

    Soft circuit materials such as an epoxy or plastic form a coating around a filler, often a glass weave. This form of glass – or a ceramic filler – provides strength and rigidity to the plastic dielectric material. Here are three typical base-substrate soft/flexible materials:
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