Compact Microstrip Spurline Bandstop Filter with Defected Ground Structure (Dgs)

摘要

This paper presents a new structure to implement compact narrowband high-rejection microstrip band-stop filter (BSF). This structure is the combination of two traditional BSFs: Spurline filter and BSF using defected ground structure (DGS). Due to inherently compact characteristics of both Spurline and interdigital capacitance (used as DGS), the proposed filter shows a better rejection performance than Spurline filter and open stub conventional BSF without increasing the circuit size. From, the proposed BSF has a rejection of better than 20dB and the maximum rejection level of 41dB.