A novel microstrip dual-band bandpass filter with wide and deep stopband using modified SIRs

Abstract

In this article, a magnetically coupled dual-band bandpass filter (DB-BPF) using stepped impedance resonators (SIR) is presented. The obtained passbands have elliptical function response with good stopband rejection levels. In this filter design, both passbands can be controlled independently while keeping the same filter performance. These independency in bandwidth shifting, make the design flexible to meet many applications. The proposed filter has a compact size of 12.7×32mm. The measurement results are in good agreement with the simulations ones