择PCB板材必须在满足设计需求和可量产性及成本中间取得平衡点。设计需求包含电气和机构这两部分。通常在设计非常高速的PCB板子(大于GHz的频率)时这材质问题会比较重要。例如，现在常用的FR-4材质，在几个GHz的频率时的介质损(dielectric loss)会对信号衰减有很大的影响，可能就不合用。就电气而言，要注意介电常数(dielectric constant)和介质损在所设计的频率是否合用。-Optional PCB sheet must meet the design requirements and production and cost point of balance between. Design requirements contained in both parts of the electrical and institutions. Usually in the design of very high-speed PCB board (more than GHz frequencies) when this material would be more important question. For example, now commonly used FR-4 material, at some GHz frequency dielectric loss at the time of (dielectric loss) on signal attenuation has a great impact, may not be combined. On the electrical term, attention should be paid to the dielectric constant (dielectric constant) and dielectric loss at the frequency of the suitability of the design.