title: Ultra-wideband filtering of spoof surface plasmon polaritons using deep subwavelength planar structures.
abstract: Novel ultra-wideband filtering of spoof surface plasmon polaritons (SPPs) is proposed in the microwave frequency using deep subwavelength planar structures printed on thin and flexible dielectric substrate. The proposed planar SPPs waveguide is composed of two mirror-oriented metallic corrugated strips, which are further decorated with parallel-arranged slots in the main corrugated strips. This compound structure provides deep subwavelength field confinement as well as flexible parameters when employed as a plasmonic waveguide, which is potential to construct miniaturization. Using momentum and impedance matching technology, we achieve a smooth conversion between the proposed SPPs waveguide and the conventional transmission line. To verify the validity of the design, we fabricate a spoof SPPs filter, and the measured results illustrate excellent performance, in which the reflection coefficient is less than -10 dB within the -3 dB passband from 1.21 GHz to 7.21 GHz with the smallest insertion loss of 1.23 dB at 2.21 GHz, having very good agreements with numerical simulations. The ultra-wideband filter with low insertion loss and high transmission efficiency possesses great potential in modern communication systems.
authors.affiliation: Department of Physics and Electronics, Liupanshui Normal University, Liupanshui, Guizhou 553004, China.|State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Ming Zhe
authors.initials: MZ
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Hao Chi
authors.initials: HC
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Jia Yuan
authors.initials: JY
authors.lastname: Yin
authors.affiliation: College of Big Data and Information Engineering, Guizhou University, Guiyang, Guizhou 550025, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Jun Feng
authors.initials: JF
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Wen Xuan
authors.initials: WX
authors.lastname: Tang
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Tie Jun
authors.initials: TJ
authors.lastname: Cui