A novel periodic defected ground structure for microstrip line with improved performances

A novel one-dimensional (1-D) defected ground structure (DGS) for the microstrip line is proposed. Different from the square-shaped DGS (SSDGS), the improved DGS (IDGS), which hold four stubs to disturb the fields in the square defected pattern, improved the effective capacitance and inductance at high frequencies, and provide a very wide bandgap characteristic with only one or more unit lattices. The performance of the unit DGS is investigated. A uniform periodic SSDGS and IDGS are designed and study. The research work show that the IDGS exhibit more excellent performances by generating stopband at high frequency bands.