Novel Multi-Band Plasmon Filters based on Double-Band Surface Plasmon Polarizations

The background motivation of this paper was SPP, which refers to surface waves occurring at terahertz frequencies, as widely used wave in optics industry.This wave has been produced during the electromagnetic field interaction with oscillations of free metal electrons.Due to their improved field and intense incarceration close to the metal surface, SPP waves have been extensively employed for high sensitivity sensors and small photonic circuits.The method herein proposed was a BPF based on designer-SPP by means of central frequency and adjustable bandwidth.It was adjusted via varactor diodes placed in different positions in the T-shaped resonator.Considering the constraints and strengths of high field SPP polarizations, hearing and coupling becomes weaker than that from the usual microstrip.Analytical and evaluation methods comprised three inductors assessed at different locations of the T-shaped resonator, which were controlled by DC bias voltage.Transition from the microstrip QTEM mode to SPP misleading mode was performed to excite SSPP based on the T-shaped resonator with g-distance coupling.