采用磁性基板的高感值PCB平面电感器设计

Large Inductance Value PCB Planar Inductor Design Using Magnetic Substrate

为增加PCB平面电感器单位面积上的电感值,提出一种采用磁性基板作为PCB叠层制作高感值PCB平面电感器的方法,并将磁性基板应用于两种典型的平面螺旋电感结构设计中。采用HFSS全波仿真方法对采用常规FR4基板和磁性基板的平面电感设计进行了比较,结果显示使用磁性基板能够在保持电感Q基本不变的情况下增大单位面积上的电感值,使用磁导率为2和1.5的磁性基板设计的电感器单位面积电感值能够达到13.1 n H/mm2和8.9 n H/mm2,与使用磁导率为1的FR4基板相比单位面积电感值的增大量与所使用磁性基板的磁导率基本成正比关系。

In order to increase the inductance value of PCB planar inductor per unit area, a new design of producing the large inductance value PCB planar inductor using magnetic substrate is presented. The magnetic substrate is used in two kinds of typical structural design of planar spiral inductors. Full wave HFSS simulation is used to compare the performance of planar spiral inductors used by the conventional FR4 substrate and the magnetic substrate, and the simulation results show the inductance per unit area can be increased by using the magnetic subtract in the case of keeping the Q stable. The inductance per unit area of the inductor used the magnetic substrate with magnetic permeability 2 and 1.5 can reach 13.1 n H/mm^2 and 8.9 n H/mm^2. Compared with FR4 substrate, the increscent multiple of the PCB planar inductor inductance value per unit area after using the magnetic subtract is proportional to the magnetic permeability of the magnetic subtract.