Excitation of odd-mode spoof surface plasmon polaritons and its application on low-pass filters

Abstract

Dispersion properties of compact single- and double-side grooves SSPPs are analyzed and compared. The combination of two single-side grooves with opposite phases can sustain the odd-mode SSPPs, which is contrary to the dominantly even mode SSPPs existed on metal-dielectric interfaces in optical frequencies or on structured metal surfaces in the lower frequencies. Two low-pass filters based on odd-mode SSPPs working at 0–7 and 0–14.1 GHz are fabricated and measured. Both simulations and measurements validate that the proposed SSPPs structure can realize high-efficiency excitation of odd-mode SSPPs and low-loss transmission properties.

Novel high‐efficiency and ultra‐compact low‐pass filter using double‐layered spoof surface plasmon polaritons

“…To highlight the advantages of the proposed ultracompact SSPP low-pass filter, Table 1 lists the multi-layer SSPPs waveguide, 11 the compact complementary structure, 14 the double-layered conformal surface plasmons, 18,20 the novel differential bandpass filter, 21,23 the compact single-and double-side grooves SSPPs, 22 and the proposed filter, in which the Conformal (Y/N), IL, RL, and λ 0 represent the conformal characteristic (yes/no), insertion loss, return loss, and the wavelength corresponding to the central operating frequency, respectively. The comparison shows that the proposed ultra-compact SSPP low-pass filter has superior performance in a miniaturized electrical size and conformal characteristic.…”

A high‐performance mode multiplexer based on hybrid spoof surface plasmon polariton and substrate integrated waveguide

“…35,36 Then, many efforts have been made to construct the odd-mode SSPP RF devices. [37][38][39][40] The odd-mode and even-mode of SSPP need different excitation methods because the two modes are orthogonal. However, the same-frequency mode multiplexing has not been realized in the above research.…”

“…In addition, the complementary symmetric grooves structure can support the transmission of odd‐mode SSPP 35,36 . Then, many efforts have been made to construct the odd‐mode SSPP RF devices 37–40 . The odd‐mode and even‐mode of SSPP need different excitation methods because the two modes are orthogonal.…”

Relation between cut-off frequency and equivalent circuit of spoof surface plasmon polariton and its applications

“…[1][2][3][4] A periodically corrugated metal slab demonstrates that the periodic structure can be utilized to support SSPP waves. 3,4) Since then, different kinds of transmission line (TL) [5][6][7][8][9][10][11][12][13][14][15][16][17][18] structures supporting SSPP mode have been designed for applications in filters, [7][8][9][10][11][12][13][14] resonators, 15,16) couplers, 17) splitters 18) and antennas. [19][20][21] All the SSPP-TLs reported in [5][6][7][8][9][10][11][12][13][14] exhibit high cut-off frequencies with relatively large sizes, which limits their applications in lowfrequency bands, such as the industrial scientific medical (ISM) band.…”

“…3,4) Since then, different kinds of transmission line (TL) [5][6][7][8][9][10][11][12][13][14][15][16][17][18] structures supporting SSPP mode have been designed for applications in filters, [7][8][9][10][11][12][13][14] resonators, 15,16) couplers, 17) splitters 18) and antennas. [19][20][21] All the SSPP-TLs reported in [5][6][7][8][9][10][11][12][13][14] exhibit high cut-off frequencies with relatively large sizes, which limits their applications in lowfrequency bands, such as the industrial scientific medical (ISM) band. Therefore, SSPP structures characterized by lower cut-off frequencies and relatively small physical sizes are highly desirable.…”