Design of Highly Selective Dual Band Band Stop Filter using Dual-Path Step Impedance Resonator

Abstract

In this article, the primary focus is on improving selectivity through the design of a dual-band bandstop filter (BSF), which is the abbreviation for bandstop filter. For the design of the filter, a dual-path Step Impedance Resonator, or DP-SIR, is utilised. A theoretical analysis of the suggested DP-SIR structure is presented in this body of work. At 3.76 and 11.04 GHz, the proposed architecture produces a dual-band BSF with fractional bandwidths of 50.5% and 16.36%, respectively. The comprehensive study demonstrates that the resonant frequencies can be controlled by adjusting the electrical length of the SIR. In addition, it has been found that dual-path SIR is involved in the production of finite frequency transmission poles, which results in an improvement in selectivity. This was discovered by accident. The results of the measurements and the simulations are fairly consistent with one another.

Keywords

• Bandstop filter, Step Impedance Resonator, Microwave