说明：  1、如何选择PCB板材？ 选择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。
(1, how to choose the PCB board? Select the PCB board must meet the design requirements and production and cost the middle point of balance. Design requirements include both electrical and body parts. Usually very high-speed PCB design board (greater than GHz frequencies) when this problem would be more important material. For example, the now commonly used FR-4 material, the frequency of several GHz, the media loss (dielectric loss) would have great impact on signal attenuation may not be combined. The electrical, in order to pay attention to the dielectric constant (dielectric constant) and media loss in the suitability of the design frequency.)