New Defected Microstrip Structure Bandstop Filter

摘要

Defected microstrip structure (DMS) has similar properties with defected ground structure (DGS) but without any leakage through the ground plane. In this report, the stop-band performance of DMS is studied, and new single band, dual-band and tri-band bandstop filters with DMS are proposed. The dual-band and tri-band bandstop filters are fabricated, and the measured results are similar to the simulation. The new DMS bandstop filters have advantages of good frequency selectivity, low loss and simple circuit topology, and simultaneously, has a miniature circuit size of no more than 30 mm × 1.2 mm.