Differential surface plasmon polaritons transmission line with controllable common mode rejection

Abstract

In this paper, a spoof surface plasmon polarions (SPPs) transmission line is designed by patterning thin metal film in open-cross shape arranged in array. Numerical simulations show the proposed open-cross array can support spoof SPPs with enlarged propagation constant and hence enhanced confinement at metal/dielectric interface as compared to the reported ultra-thin plasmonic waveguide with the rectangular groove or solid-cross. Furthermore, a differential transmission line pair is built with such two close plasmonic arrays. A narrow metal strip locates at the symmetrical plane of the two SPPs waveguides and acts as a resonator to realize common-mode rejection at specific frequency. The notch frequency for common mode can be adjusted by tuning the metal strip length of the resonator while differential mode propagation remains unaffected. Both simulated and experimental results with good agreement are given to verify the proposed idea.

Microwave Spoof Surface Plasmon Sensor for Dielectric Material Characterization

“…To achieve spoof surface plasmon propagation at microwave frequencies, a periodical corrugation of the metal signal line, including holes or grooves has been proposed [4]. The geometry dependency on the spoof surface plasmon excitation makes it possible to develop circuits and transmission lines at microwave frequencies [5]. Many works related to surface plasmon microwave transmission lines, filters and antennas have been reported [4][5][6][7][8][9][10][11][12].…”

“…The geometry dependency on the spoof surface plasmon excitation makes it possible to develop circuits and transmission lines at microwave frequencies [5]. Many works related to surface plasmon microwave transmission lines, filters and antennas have been reported [4][5][6][7][8][9][10][11][12].…”

“…Recently, the work reported in [5] shows a microwave surface plasmon transmission line using an open cross structure. In this paper, a resonator is formed inspired on the transmission line described in [5] and used to form a high sensitivity low-cost sensor.…”

“…Recently, the work reported in [5] shows a microwave surface plasmon transmission line using an open cross structure. In this paper, a resonator is formed inspired on the transmission line described in [5] and used to form a high sensitivity low-cost sensor. The proposed microwave spoof surface plasmon sensor for dielectric material characterization is used to measure four-inch wafer samples with different permittivity and thickness.…”

Bandwidth‐controllable band‐stop filter using spoof surface plasmon polaritons

“…SSPPs possess excellent properties of stronger field confinement and enhancement capability, dispersion control capability than other planar slow wave structures, and sub‐wavelength size. Hence, it can be widely applied to many radio frequency circuits and systems, such as low‐crosstalk line, filters, power divider, antennas, sensor, and so on.…”