Low pass filter design with wide rejection based on array of modified CSRRs configuration

This contribution presents the design of a low pass filter LPF with wide rejection based on modified complementary single split ring resonator (CSRR). The CSRRs are etched on the back side of the transmission and connected by slot line to achieve the desired resonance frequency. The quasi-static resonance of the CSRRs elements drives the cut-off frequency of the LPF and closed fundamental resonances achieve the wide rejection. Two Array configuration are proposed and demonstrate a good improvement in term impedance bandwidth of LPF rejected band. A good agreement match is shown between presented measured and simulated results. As part of the optimization design, we analyzed the behaviors of the initial filtering structure with two different CSRR radius.