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oe1(光电查) - 科学论文

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  • [IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Independently tunable dual-band metamaterial absorber based on graphene at mid-infrared frequencies

    摘要： Despite the great achievement in understanding of the graphene-based metamaterial absorbers (GMAs), the limitations such as single narrowband absorption, low absorption peak and multiple bands that can’t be independently tuned have not been completely overcome. This paper reports a dual-band absorber through etching two cascaded metallic resonators with different sizes in the unit cell of GMA. Two independently tunable absorption bands with absorption peaks greater than 99% are obtained at mid-infrared frequencies.

    关键词： dual-band,independently tunable,metamaterial absorber,mid-infrared,graphene

    更新于2025-09-11 14:15:04

  • AN INDEPENDENTLY TUNABLE DUAL-BAND BANDPASS FILTER USING A CENTER SHORTING-STUB-LOADED RESONATOR

    摘要： This paper presents an independently tunable dual-band bandpass ?lter based on center shorting-stub-loaded resonators. The center shorting-stub-loaded resonator is a dual-mode resonator that generates odd-even modes approximately equal and coupled when the shorting stub is very short. Two di?erent sizes of center shorting-stub-loaded resonators produce two separated resonant frequencies, which are mutually independent. The coupling between the source and load is introduced in the circuit by designing an appropriate coupling structure, and the skirt selectivity of the ?lter is greatly improved. Four varactor diodes are placed at the two open-circuit ends of the center shorting-stub-loaded resonator to control the two separated resonant frequencies. A prototype of a tunable dual-band ?lter with Chebyshev response is designed and fabricated. The measured results are in good agreement with the full-wave simulated results. Results show that the ?rst passband varies in a frequency range from 0.81 GHz to 0.95 GHz with a 3 dB fractional bandwidth of 4.2% to 5%, whereas the second passband can be tuned from 1.51 GHz to 1.79 GHz with a 3 dB fractional bandwidth of 6.8% to 8%.

    关键词： varactor diodes,tunable dual-band bandpass ?lter,center shorting-stub-loaded resonator,independently tunable

    更新于2025-09-04 15:30:14