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This work was supported by National Basic Research Program of China (973) (Grant No. 2014CB339801) and National Natural Science Foundation of China (Grant Nos. 61231005, 11305030).
The authors declare that they have no conflict of interest.
Supporting information Figures S1–S3. The supporting information is available online at info. scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.
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Zhong, R., Ding, H., Liu, Y. et al. A kind of compact ultra-broad bandpass planar terahertz filter. Sci. China Inf. Sci. 61, 069401 (2018). https://doi.org/10.1007/s11432-017-9111-5