Copper foil used in the PCB industry is more complex than you might think. Copper is both an excellent conductor of electricity and an excellent conductor of heat, making it an ideal conductor for most PCB applications. Copper foil has many other properties that are important for engineers to understand.
With HDI boards, you can affix more components on both sides of the bare PCB, allowing you to get more functionality in a smaller space and expand the overall functionality of your device. HDI technology enables you to add functionality while reducing the size and weight of your product.
24GHz radar detection system mainly supports short-range detection (SRR), high frequency circuit board and high wavelength. Applicable boards: RO4835, RO4350B, RO4003C . Among them, RO4350B nitride ceramic laminate and RO4835 nitride ceramic laminate are highly recommended. These two series belong to the cost-effective series for people’s daily use.
Power Electronics: Another benefit of a flexible printed circuit board is that it can be coupled with highly flexible, thin layers of copper, which means the board can handle heavier power currents. This is especially important in devices that will require more power to operate at full capacity, like those found in the power electronics industry.
Generally, multilayer circuit boards are designed with large amounts of copper foil as grounding devices. Sometimes, the Vcc layer is also designed with large amounts of copper foil. When these large amounts of copper foil cannot be evenly distributed on the same multilayer circuit board, it will cause problems with uneven heat absorption and heat dissipation rates. The multilayer circuit board will naturally expand and contract when heated and contract when cooled. If the expansion and contraction cannot be achieved at the same time, different ground stresses will be caused and the board will deform. At this time, if the temperature of the board has reached the limit of the Tg value, the board will gradually soften and cause deformation
When designing a multi-layer PCB, you need to pay attention to a basic situation, that is, how many wiring layers, ground planes, and power planes are needed to achieve the required functions of the circuit. The establishment of the number of wiring layers, ground planes, and power planes of the multi-layer PCB is related to the basic functions of the circuit, signal integrity, EMI, EMC, manufacturing costs, etc.
Unlike standard printed circuit boards, flexible PCB circuit boards use flexible polymers instead of typical FR4 materials. The commonly deployed flexible polymers require a polyimide film substrate or a polyester substrate, which is a strong material that does not soften under heating and remains flexible when thermoset. A large number of thermosetting resins such as PI remain rigid after heating, making them ideal for flexible circuit boards.
Whether the signal quality will be affected depends on the method of adding test points and how fast the signal is. Basically, the additional test points (without using the existing vias (via or DIP pins) as test points) may be added to the line or a short line may be pulled out from the line. The former is equivalent to adding a very small capacitor to the line, and the latter is an additional branch
With the rapid development of electronic technology and the widespread application of wireless communication technology in various fields, high frequency, high speed and high density have gradually become one of the significant development trends of modern electronic products. The high frequency and high speed digitalization of signal transmission force PCB to move towards micro-holes and buried/blind holes, fine wires, and uniform thin dielectric layers. High-frequency, high-speed, high-density multi-layer PCB design technology has become an important research field. This time, we mainly want to learn some practical skills in high-frequency PCB design.
With the development of electronic information technology, multi-layer PCBs are used in more and more fields. Traditionally, we define PCBs with more than four layers as “multi-layer PCBs” and PCBs with more than ten layers as “high-layer PCBs”. Whether or not a PCB manufacturer can produce high-layer PCBs is an important indicator of its strength. A PCB manufacturer that can produce high-layer PCBs with more than twenty layers is considered to be a PCB company with outstanding technical strength.