Spoof surface plasmon polaritons based notch filter for ultra-wideband microwave waveguide

Abstract

Spoof surface plasmon polaritons based notch filter for ultra-wideband microwave waveguide is proposed. Owing to subwavelength confinement, such a filter has advantage in the structure size without sacrificing the performance. The spoof SPP based notch is introduced to suppress the WLAN and satellite communication interference simultaneously. Both the cutoff frequency and the notch frequency are sensitive to the structure parameters, and the cutoff frequency can reach 20 GHz. An adiabatic transition relying on gradient hole-size and flaring ground is designed to effectively couple energy into spoof SPP waveguide. The result shows its cutoff frequency of 17.4 GHz with the insertion loss better than 3dB during the whole pass-band, while having more than 20 dB rejections at 5.36GHz and 9.32GHz with 10dB fractional bandwidth 1.07% and 0.74% respectively to avoid the existing WLAN and satellite communication signals. Due to planar structures proposed here, it is easy to integrate in the microwave integrated systems, which can play an important role in the microwave communication circuit and system.

A Spoof Surface Plasmon Polaritons (SSPPs) Based Dual-Band-Rejection Filter with Wide Rejection Bandwidth

“…There exist various MBRF designs based on SSPPs in the literature [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. In Reference [ 30 ], by etching split-ring resonators (SRRs) on an SSPP waveguide, a MBRF with two narrow band rejections at 8.21 GHz and 10.04 GHz is obtained.…”

“…In Reference [ 30 ], by etching split-ring resonators (SRRs) on an SSPP waveguide, a MBRF with two narrow band rejections at 8.21 GHz and 10.04 GHz is obtained. In Reference [ 31 ], more than 20 dB rejections at 5.36 GHz and 9.32 GHz are achieved with 10 dB fractional bandwidth 1.07 and 0.74%, respectively. In Reference [ 32 ], around 8 dB rejections with center frequencies 4.04 and 4.5 GHz are generated by introducing multiple defect units into an ultra-thin periodic corrugated metallic strip.…”

Multi-band rejection filters based on spoof surface plasmon polaritons and folded split-ring resonators

“…Ref. [10,11] achieve the MBRFs by placing the rejection resonators next to the SSPP units with low-pass frequency characteristics, which offer narrow rejection bands and bulky sizes. The low-pass SSPP units are also etched into rejection ones, hence the filter size is reduced [12,13].…”

Plasmonically induced perfect absorption in graphene/metal system

“…Recently, a novel plasmonic phenomenon, known as the spoof surface plasmons (SSPs), has been observed, which can propagate through perforated metals and overcome the diffraction limit [16]. SSPs were then explored in the THz, microwave, and lower frequency range [17–19], and a number of deep-subwavelength devices based on SSPs have been proposed demonstrated [20, 21]. However, the application of such devices is seriously hampered by SPPs’ high damping rate.…”