Double-Sided Spoof Surface Plasmon Polaritons- Line Bandpass Filter With Excellent Dual-Band Filtering and Wide Upper Band Suppressions

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

“…6 SSPP TL is a new type of slow-wave TL with low dielectric loss and low crosstalk used at microwave and THz bands. Since then, planar SSPP TL has been widely used in a variety of RF circuits and devices, [7][8][9][10][11][12][13][14] such as filters, splitters, and leaky wave antennas. However, the planar SSPP composed of corrugated metal is an open structure, and radiation loss and poor selectivity are inevitable.…”

“…33,34 For most of the transmission structures composed of planar SSPP based on corrugated metal lines, the operating mode is even mode. [7][8][9][10][11][12][13][14] 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.…”

A Novel Synthetization Approach for Multi Coupled Line Section Impedance Transformers in Wideband Applications

“…A diagram of the typical end-fed antenna system is shown in Figure 1, where the IT is used to match the antenna impedance to the coax line impedance (usually 50 Ω). Many IT and filter structures have been developed in recent years [2][3][4][5][6][7][8][9][10][11][12][13], and multi-function ITs which are integrated by filters [14][15][16][17][18][19][20], phase shifters [21], power dividers [22], and antennas [23] have also been widely researched. In [2,3], a quarter-wave IT is presented using transmission lines (TLs) for single-band applications with a limited operating range.…”

Design of Wideband Bandpass Filter Based on Corrugated Disk Resonator with Multiple Resonant Modes

“…Therefore, the plasmonic metamaterials with textured closed surfaces have been researched to support localized electromagnetic resonances at terahertz (THz) and microwave bands, which have similar properties to those of the spoof surface plasmon polaritions (SSPPs) or those designed with a highly confined surface electromagnetic wave [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. SSPPs waveguide which works as lowpass filtering part integrated with coplanar waveguide, substrate waveguide, or bandpass filtering part are widely applied in wideband or dual-band BPFs design [ 10 , 11 , 12 , 13 ]. Surface plasmon resonances are usually applied in sensor, absorber, and frequency selective surface design [ 15 , 16 , 17 , 18 , 19 ].…”

“…The eigenmode method can be used to analyze the textured structure in microwave frequency band for resonances as well. The most used structures of spoof LSP resonator are the periodically corrugated disk structure [ 6 , 7 , 8 , 9 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ] and the metallic spiral structure [ 22 , 23 ]. The resonant modes excited by a plane wave or a microstrip line in disk or ring resonators are depicted as dipole, quadrupole, hexapole, octupole modes, and so on.…”