Luo Yu-Xuan, Cheng Yong-Zhi, Chen Fu, Luo Hui, Li Xiang-Cheng. Dual-band filter design based on hourglass-shaped spoof surface plasmon polaritons and interdigital capacitor structureJ. Acta Physica Sinica, 2023, 72(4): 044101. DOI: 10.7498/aps.72.20221984