在光子晶体中，引入磁导率调制来计算PBG

可以通过已知的相对磁导率、内径、外径、高度和电感值计算匝数，也可以计算电感和相对磁导率。-Can be known relative permeability, inside diameter, outside diameter, height and inductance calculation number of turns, also inductance and relative permeability can be calculated.