Complex permittivity extraction from PCB stripline measurement using recessed probe launch

[摘要] References(7)A method to extract the complex permittivity of a dielectric material in a PCB is presented. The recessed probe launch allows striplines to be measured without the need of via transitions that are subject to large process variations. After pad parasitics are de-embedded using the two-line method, the complex permittivity of the dielectric is calculated from 20 MHz to 5 GHz using closed-form equations. Internal inductance is taken into account to prevent overestimation of the permittivity at low frequency.

[学科分类] 电子、光学、磁材料

[关键词] complex permittivity;dielectric constant;loss tangent;printed circuit board;recessed probe launch;stripline