[1] VESELAGO V G. Reviews of topical problems: the electrodynamics of substances with simultaneously negative values of epsilon and μ［J］. Soviet Physics Uspekhi, 1968, 10(4): 509-514.
[2] PENDRY J B. Negative refraction makes a perfect lens［J］. Physical Review Letters, 2000, 85(18): 3966-3969.
[3] SMITH D R, PADILLA W J, VIER D C, et al. Composite medium with simultaneously negative permeability and permittivity［J］. Physical Review Letters, 2000, 84(18): 4184-4187.
[4] SMITH D R, SCURING D, PENDRY J B. Negative refraction of modulated electromagnetic waves［J］. Applied Physics Letters, 2002, 81(15): 2713-2715.
[5] SMITH D R, VIER D C, PADILLA W J, et al. Loop-wire medium for investigating plasmons at microwave frequencies［J］. Applied Physics Letters, 1999, 75(10): 1425-1427.
[7] TONG Yuan-wei, ZHANG Ye-wen. The tunable defect modes in the comb-like photonic crystals［J］. Mcirowave & Optical Technology Letters, 2011, 53(7): 1652-1656.
[8] SCHURIG D, MOCK J J, JUSTICE B J, et al. Metamaterial electromagnetic cloak at microwave frequencies［J］. Science, 2006, 314(5801): 977-980.
[9] ZHAO Ya-juan, WANG Dong-hong, ZHANG Rong, et al. A compact tunable filter based on metamaterial structure［J］. Acta Photonica Sinica, 2017, 46(6): 0616005.
[10] SHADRIVOV I V, MORRISON S K, KIVSHAR Y S. Tunable split-ring resonators for nonlinear negative-index metamaterials［J］. Optics Express, 2006, 14(20): 9344-9349.
[11] SHELBY R A, SMITH D R, NEMATNASSER S C, et al. Microwave transmission through a two dimensional isotropic left-handed metamaterial［J］. Applied Physics Letters, 2001, 78(4): 489-491.
[12] AYDIN K, GUVEN K, OZBAY E, et al. Effect of disorder on magnetic resonance band gap in split-ring resonator structures［J］. Optics Express, 2004, 12(24): 5896-5901.
[13] AYDIN K, BULU I, GUVEN K, et al. Investigation of magnetic resonances for different split-ring resonator parameters and designs［J］. New Journal of Physics, 2005, 7(7): 168-168.
[14] GIL I, GARCIA G J, BONACH J, MARTIN F, et al. Varactor-loaded split ring resonators for tunable notch filters at microwave frequencies［J］. Electronics Letters, 2004, 40(21): 1347-1348.
[15] GIL I, GARCIA G J, BONACH J, et al. Tunable metameterial transmission lines based on varactor-loaded split-ring resonators［J］. IEEE Transactions on Microwave Theory and Techniques, 2006, 54(6): 2665-2674.
[16] WU Bian, LI Bin, LIANG Chang-hong. A novel SRR defected ground structure for lowpass filter［J］. Journal of Electronics & Information Technology, 2007, 29(12): 3020-3023.
[17] ZHANG Yan,HONG Wei, YU Chen, et al. Kuai planar ultrawideband antennas with multiple notched bands based onetched slots on the patch and/or split ring resonators on the feed line［J］. IEEE Transactions on Antennas and Propagation, 2008, 56(9): 3063-3068.
[18] BONACHE J, GIL I, MARTIN F, et al. Novel microstrip bandpass filters based on complementary split-ring resonators［J］. IEEE Transactions on Microwave Theory and Techniques, 2006, 54(1): 265-271.
[19] ZHANG Qiao-Li, YIN Wen-yan, HE S, et al. Compact substrate integrated waveguide(SIW) bandpass filter with complementary split-ring resonators(CSRRs)［J］. IEEE Microwave and Wireless Components Letters, 2010, 20(8): 426-428.
[20] HORESTANI A K, MIGUEL D, NAQUI J, et al. S-shaped complementary split ring resonators and their application to compact differential bandpass filters with common-mode suppression［J］. IEEE Microwave and Wireless Components Letters, 2014, 24(3): 149-151.
[21] MARQUES R, MESA F, J. MARTEL, et al. Comparative analysis of edge and broadside coupled split ring resonators for metamaterial design theory and experiments［J］. IEEE Transactions on Antennas and Propagation, 2003, 51(10): 2572-2581.
[22] LAI X, LI Q, QIN P Y, et al. A novel wideband bandpass filter based on complementary split-ring resonator［J］. Progress in Electromagnetics Research, 2008, 1(1): 177-184.
[23] MARTIN F, FALCONE F, BONACHE J, et al. Miniaturized coplanar waveguide stop band filters based on multiple tuned split ring resonators［J］. IEEE Microwave and Wireless Components Letters, 2003, 13(12): 511-513.
