A terahertz three-band narrowband bandpass filter based on metamaterials

Abstract

The invention discloses a Terahertz three-wave-band narrow-band band-pass filter based on a metamaterial. The filter comprises three nested metal square ring resonance units and a filter unit formed by a dielectric layer and a cross metal resonance unit. In the invention, through using the filter unit, a terahertz wave band is used to realize a three-wave-band narrow-band band-pass filter. A structure unit of the filter possesses rotation symmetry, and the filter is insensitive to terahertz wave incidence polarization and large angle incidence and still maintains a good three-wave-band filtering characteristic. The three-wave-band filtering characteristic of the composite structure is from linear superposition of filtering characteristics corresponding to the three square ring resonance units respectively. Through changing a geometrical size of each square ring resonance unit, a corresponding filtering frequency range is regulated and controlled. Based on the above condition, more wave band filtering can be realized in the terahertz wave band. The design of the filter is simple, the size is small, processing is convenient and a high practical value is possessed in terahertz technologies of terahertz communication, imaging, spectral analysis and the like.

Description

technical field [0001] The invention belongs to the technical field of terahertz waves, and in particular relates to a terahertz three-band narrowband bandpass filter based on metamaterials. Background technique [0002] Terahertz waves, also known as submillimeter waves, are electromagnetic waves with wavelengths between millimeter waves and infrared light waves. In recent years, with the continuous development of terahertz wave generation and detection technology, the application of terahertz wave in the fields of imaging, communication, biological detection and national defense security inspection has attracted much attention. To make terahertz waves widely and widely used, the design and realization of terahertz band devices is a necessary prerequisite. [0003] In a communication system, a bandpass filter is an important device, which can transmit signals within a specific frequency range and block signals outside this frequency range to achieve the purpose of selectiv...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to overcome the shortcomings of the current terahertz single-band bandpass filter, the present invention provides a design of a terahertz three-band narrowband bandpass filter based on metamaterials. This filter has multi-band filtering, polarization It has the advantages of insensitivity, wide-angle incident stability, and good passband selection, as well as simple design, small size, and convenient processing. It has high practical value in terahertz technology

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