Design and implementation of a novel tri-band bandstop filter based on hexagonal metamaterials split ring resonators

In this paper, a novel tri-band bandstop filter (BSF) based on hexagonal split ring resonators (H-SRRs) is presented. The proposed filter consists of a microstrip fed line loaded with three H-SRRS. Various modifications to the HSRR are made and their effects on the permittivity are discussed. The filter is fabricated and measured. Good agreement is obtained between numerical and experimental results.