基于LCP基板的平面螺旋电感设计与实现

Design and implementation of planar spiral inductor based on LCP substrate

平面螺旋电感作为射频微波电路的重要基础元器件,在电路中发挥着储能、滤波和阻抗匹配等关键作用,因此设计符合小体积高性能要求的平面螺旋电感显得尤为重要。基于液晶聚合物(LCP)基板制作了一系列平面螺旋电感,建立了适用于LCP基板的平面螺旋电感集总参数等效电路模型。系统研究了线圈匝数、金属线宽和线圈形状变化对电感有效值、品质因数(Q值)和自谐振频率的影响规律,并且通过在电感接地面引入缺陷地结构,减小了接地面对电感磁通量的束缚,从而在保持自谐振频率基本不变的情况下,使电感有效值和品质因数得到显著提高,因此缺陷地结构对减小电感体积和性能提升具有重大意义。

Planar spiral inductors are important components in radio frequency microwave circuits and used for energy storage,filtering,and impedance match.Therefore,it is particularly important to design a planar spiral inductor with small size and high performance to meet the requirement.In this paper,a series of planar spiral inductors were fabricated based on liquid crystal polymer(LCP)substrate,and a lumped-parameter equivalent circuit model of planar spiral inductors suitable for LCP substrates was established.The influence of the number of turns,the width of the metal wire,and the shape of the coil on the effective value of the inductance,the quality factor(Q value)and the self-resonant frequency were systematically studied.By introducing a defective ground structure on the ground surface of the inductance,the restriction of the ground surface to the magnetic flux of the inductance was reduced,the effective value and quality factor of the inductor were significantly improved while keeping the self-resonant frequency unchanged.Therefore,the defective structure is of great significance for reducing the volume and improving the performance of the inductor.