Multiple band notch filter using contiguous split ring resonators (SRR)

A novel, compact, multiple band notch filter (MBNF) is presented. Contiguous and concentric split ring resonators (SRRs) and ring resonator are used to achieve desired multiple narrow band notches. These band notches have been designed to avoid the undesired interference between co-existing wireless channels. Proposed filter is implemented on RT/Duroid 5880 (εr=2.2) substrate of thickness 0.785 mm and surface area of 14 × 14 sq. mm. Insertion loss of the proposed filter at notch bands is high (>13 dB) and low (<0.8 dB) elsewhere. Measured results are correlated with simulated results and ensure proposed filter is a suitable candidate to mitigate interference caused by the co-existing and emerging wireless technologies.