Compact Double Notch Coplanar and Microstrip Bandstop Filters Using Metamaterial—Inspired Open Ring Resonators

Compact double notch coplanar and microstrip bandstop filters are described. They based on a version of the open interconnected split ring resonator (OISRR) integrated in or waveguides. The OISRR introduces an RLC connected parallel with propagating line. Therefore, this can be modeled as shunt circuit to ground, R, L C elements series. consequence for frequency response device is band at resonant circuit. number bands controlled by adding more OISRRs, since each pair rings therefore additional band. In paper, we demonstrate that these introduced concentric way same cell, so size does not increase compact multi-notch achieved, pairs rings, plus spurious higher frequency.