Odd-mode and even-mode SSPPs transmissions based on complementary comb-like structure

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

“…[1][2][3][4][5][6][7] In order to realize highconfinement SPPs at low frequency, some plasmonic metamaterials have been proposed to support and propagate spoof SPPs (SSPPs) in the THz and microwave frequency bands. 8,9) To obtain SSPPs, arrays of slits, holes, and blocks are embellished on the metallic surface, and the corrugated metallic structures are efficient to support and propagate SSPPs among those previously reported works. [10][11][12][13] In recent years, the symmetric and asymmetric corrugated metallic structures have been placed on the dielectric substrates to create conformal SSPPs on the arbitrary curved surfaces, which make it have a great potential application on the integrated circuits design at microwave and THz bands.…”

“…A smooth transition by gradual increase of groove depth, which moves the flaring ground from the structure, is also proposed to realize high-efficiency and low-loss transducer of odd-mode SSPPs. Moreover, the proposed SSPPs low-pass filters have much more compact size with 1.7λ × 0.35λ × 0.02λ (λ is the wavelength at 6 GHz) compared with some existed works, [4][5][6][8][9][10][11][12][13] Based on the proposed ones, two low-pass filters, one is working at 0-7 GHz, and the other is working at 0-14.1 GHz, are fabricated and tested, and their ability of low-loss and high-efficiency transmission of odd-mode SSPPs is verified by simulations and experiments in the desired frequency bands.…”

“…More importantly, the dispersion characteristics of SSPPs can be tailored by tuning its geometrical parameters, making it attractive in the practical application. 3,[8][9][10][11][12][13][14][15] Many kinds of functional devices based on SSPPs have been proposed. For example, various plasmonic transmission lines (TLs) have been developed.…”

“…These TLs can be used to enhance the EM field confinement, reduce the crosstalk and improve the transmission efficiency, 5,6,8,11,12,[17][18][19][21][22][23] and some active components such as PIN diode and tunable varactor also are introduced in the design of SSPPs TLs to manipulate EM waves actively. 3,11,22,24,25) However, most of the reported works related with SSPPs TLs are based on single conductor TLs, which requires a flaring transition ground to have a good momentum match between the coplanar waveguides and SSPPs mode, [3][4][5][6][7][8][9][11][12][13][14][15][16][17][18][19] making it complicated to design or inconvenient to connect with the traditional two-conductor TLs. Furthermore, either on metal-dielectric interfaces at optical frequencies or on structured metal surfaces at microwave frequencies, SPPs are dominantly even modes.…”