PCL-BPF using Different Types of Defected Ground Structure (DGS) in Microwave Applications

This paper presents the analysis on different types of DGS on parallel coupled line filter for microwave applications. The filter is design using Rogers RO4003C as its substrate with thickness of 0.813mm and dielectric permittivity of 3.38. Different DGS types are chosen to investigate its effect towards the filter's performances. The simulation is done using Advance Design System (ADS) V2020 and measured using R&S Vector Network Analyzer. It shows that the parallel coupled line filter with H-shaped type, resulted reduction in size and enhancement of both insertion and return loss compare to conventional parallel line coupled filter. The filter is then fabricated with the size of 18.017mm×22.036mm, and gave the results of measured return loss, 20.238dB and insertion loss of 1.412dB compare to conventional design, with the size of 18.553mm×26.930mm with return loss of 11.042dB and insertion loss of 1.781dB respectively.