Spoof Plasmonics Based Band-Pass Filter Using T-Shaped Resonator and Metamaterial Particles

This paper reports the design, development and experimental characterization of spoof plasmonics based bandpass filter (BPF) using T-shaped resonator and metamaterial particles. The operational behavior of slow wave spoof SPP based T-shaped resonator has been explained through even-odd mode analysis. For input/output coupled feed, a corrugated groove based slow wave transmission line has been used. Further, by etching metamaterial particles in T-shaped resonating structure, lower operating frequency, better matching, and higher selectivity are achieved with the same physical dimension. The designed filter has a single band response with center frequency f
₀
of 3 GHz. Measured insertion loss is around ~3 dB and return loss is better than 10 dB for the pass-band. The proposed filter has two transmission zeroes at both sides of the pass-band located at 2.97 GHz and 3.2 GHz which enhance the selectivity of the pass-band. The 10 dB out of band spurious rejection bandwidth of the designed filter is 4 GHz (3.2 GHz-7.2 GHz) which is > 2f
₀
. The proposed filter will pave an important role in the design and development of plasmonic circuits and systems.