基于等效电路模型映射的DGS低通滤波器设计

Design of DGS Low Pass Filter with Equivalent Circuit ModelMapping

在分析缺陷地结构(DGS)单元及其等效电路模型的基础上,采用了一种新颖的椭圆DGS单元并建立了椭圆DGS单元与其等效电路之间的映射关系。根据该映射关系利用电磁仿真的S参数提取出等效电路模型的元件值,通过基于矩量法(MoM)的快速电路仿真优化得到目标频率响应对应的电路元件值,根据电路优化的结果调谐低通滤波器的电磁模型。最终获得所需低通滤波器结构。实验证明该滤波器的电磁仿真、等效电路仿真及实测结果吻合,验证了该设计方法的有效性和准确性。

As the equivalent circuit model of the defected ground structure(DGS) unit was analyzed,a mapping relationship between DGS unit and its equivalent was established by using a novel elliptic shape DGS.The devices values of the equivalent circuit could be obtained from the simulated S parameters.And the low pass filter could be optimized by simulated its equivalent circuit model with method of moments(MoM).The filter was finally adjusted and optimized according to the mapping of the circuit simulated.Finally,a low pass filter was simulated,optimized and fabricated.The experiment results showed a good agreement and validity for the proposed design method.