A Novel Band-Stop Filter using Octagonal-Shaped Patterned Ground Structures along with Interdigital and Compensated Capacitors

摘要

This paper presents a novel compact microstrip band-stop filter (BSF) based on octagonal defected ground structure (DGS) along with interdigital and compensated capacitors. The proposed BSF has lower and higher cut-off frequencies of 3.4 GHz and 5.3 GHz, respectively. A comparison between simulation and measurement results confirms the validity of the BSF configuration and the design procedure. The compact filter occupies an area of (0.45λg × 0.35λg) with λg = 0.044 m on an εr = 3.66 substrate and shows a 44% bandwidth (≈ 2GHz) and a return loss of 0.1 dB. The experimental results show the excellent agreement with theoretical simulation results.