Slow Wave Spoof Plasmonic Metamaterial Based Multi-Band Band-Stop Filter Using Complementary Split Ring Resonators

In this paper, we report a slow wave spoof plasmonic metamaterial based multi-band band-stop filter using a series of complementary split ring resonator (CSRR). Trapezoidal shape loaded grooved stepped impedance resonators (GSIRs) is employed. Compared with the simple trapezoidal shape, the proposed GSIR based structure shows enhanced confinement of surface wave in the vicinity of the metal dielectric interface. In this work, a series of the CSRRs are etched in the ground plane of the developed spoof plasmonic based transmission line circuit, which creates multiple wideband stop-bands at center frequencies 2.6/3.8/5.25 GHz with corresponding rejection levels 40/19/21 dB and 10-dB bandwidths of 646/836/610 MHz respectively within the specified operating frequency range. To validate the concept, the aforementioned device has been fabricated and experimentally characterized. The above mentioned spoof plasmonic band-stop structure have potential application in plasmonic integrated circuits and systems including to develop various sensor.