| Citation: | CHEN Xiang-xue, FU Zi-qin, WANG Feng-chao, CHEN Jin, YANG Jing. Terahertz band-stop filter with H-type structure[J]. Chinese Optics. doi: 10.37188/CO.2023-0179
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In this paper, a metamaterial terahertz band-stop filter is designed based on a symmetrical H-type structure. The continuous metal arm of this H-type structure can flow current, which can provide an effective reference for expanding the application of metamaterial filters in the field of electronics. Using electromagnetic simulation software CST Microwave Studio 2021, the filtering characteristics of the filter were studied, and The geometric parameters of the filter are determined by changing the arm length, period length and double H distance. The results show that the structure can realize the function of polarization selection. Under the condition of y polarization, the filter has no obvious resonance peak in the range of 0.2−2.3 THz, but the transmittance ranges from −15 dB to −3 dB. Under the X-polarization condition, a stopband of 0.15 THz FWHM bandwidth can be obtained at the center frequency of 1.34 THz, and the transmission parameter is about −30 dB. In order to verify the simulation results, the sample of metamaterial filter was prepared by micromachining technology, and the sample was tested by transmissed-terahertz time-domain spectroscopy system. The test results were in good agreement with the simulation results.
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