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

Abstract

This article presents a bandwidth-controllable band-stop filter based on spoof surface plasmon polaritons (SSPPs) transmission line in the microwave frequency band. The approach of introducing rectangular slots into the corrugation strips offers a greater degree of flexibility in the SSPPs unit cell design. Meanwhile, the high-order mode can be pulled to the low frequency segment of interest. The lower and upper edge of the stop band of this filter, therefore, can be controlled independently and conveniently. An equivalent circuit model of this unique unit cell is proposed for analyzing stop band formation and guiding the design of this SSSPs filter. Both numerical simulations and measured results demonstrate excellent stop band performance of the filter. The proposed filter may have potential applications in the SSPPs-based communication system. K E Y W O R D S band-stop filter, equivalent circuit, independently control, spoof surface plasmon polaritons

A band‐stop filter based on spoof surface plasmon polaritons using complementary split‐ring resonators

“…Since UWB filters cover a wide frequency band, band‐stop filters are utilized to prevent interference between UWB systems and other wireless systems 14 . Band‐stop filters based on SSPPs have been studied in many works 15–21 . In most of these works, resonant structures are employed to realize the stopband.…”

“…14 Band-stop filters based on SSPPs have been studied in many works. [15][16][17][18][19][20][21] In most of these works, resonant structures are employed to realize the stopband. In, 15 a planar SSPP ring resonator has been incorporated into a microwave SSPP waveguide to provide a sharp band notch in UWB applications to suppress possible interferences.…”

“…Several structures have been proposed to control the rejection bandwidth. [18][19][20] In, 18 a SSPP-based band-stop filter with controllable rejection bandwidth was proposed by employing rectangular slots into the corrugation strips. However, in this structure, the filter cutoff frequency changes by adjusting the stopband bandwidth.…”

“…The stopband bandwidth of the proposed filters in 15–17 is not controllable. Several structures have been proposed to control the rejection bandwidth 18–20 . In, 18 a SSPP‐based band‐stop filter with controllable rejection bandwidth was proposed by employing rectangular slots into the corrugation strips.…”

Design of a broadband diplexer based on substrate integrated plasmonic waveguide

“…Then, to be able to create integrated structures, the grooves were etched on the thin metallic layers in metal‐insulator‐metal (MIM) waveguides. Using SSPPs was an effective and novel method for manipulating and guiding electromagnetic waves, based on which SSPP waveguides and various devices such as filters and power dividers were designed in microwave and terahertz frequency bands 4‐8 …”