Using defected ground structure (DGS) to improve nonuniform microstrip bandpass filters' performance

In this paper, nonuniform bandpass filter with defected ground structure is presented. The width of the designed filter, with U shape and nonuniform, shape is obtained using an optimization process. Additionally, multiband is obtained by using defected ground structure (DGS). The performance of the proposed design is presented using high frequency structure simulator (HFSS) and computer simulation technology (CST) software packages.