Band-stop filter based on artificial surface plasmons and its stop-band introduction method

Abstract

The invention discloses a band-stop filter based on artificial surface plasmons. The structure works in a microwave frequency range, and a metal structure is only adhered to the upper layer of a medium. The band-stop filter is fed by conventional coplanar waveguides, and transition structures between the coplanar waveguides and artificial surface plasmon waveguides are utilized to realize impedance matching and wave number matching between the two kinds of waveguides. According to the invention, two unit structures of double-edge wrinkling strip line artificial surface plasmon waveguides are used to form a new unit structure, a certain distance interval of periodic arrangement is formed between every two new unit structures, and a new artificial surface plasmon transmission line is formed. The transmission line is characterized in that, capacitance structures are introduced into the conventional double-edge wrinkling strip line transmission line, and a stop band can be introduced into the frequency band of the artificial surface plasmons, so that the function of the band-stop filter is realized.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic media and wireless communication system electronic devices, and in particular relates to a band-stop filter based on artificial surface plasmons. ` Background technique [0002] Artificial surface plasmons are a kind of surface wave proposed to realize surface plasmons in microwave and terahertz bands, because surface plasmons originally only exist in light bands, when the frequency is reduced to microwave and terahertz bands , the metal will no longer support such surface plasmons. Therefore, many methods have been proposed to realize artificial surface plasmons. For example, the surface plasmon phenomenon in the optical band can be simulated by using one-dimensional or two-dimensional subwavelength periodic structures on the metal surface layer. Among them, many valuable works are realized by using subwavelength wrinkled structures. The abundance of artificial surface plasmon t...

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Problems solved by technology

Filters as important functional devices have also been realized in many ways, such as using electric resonant metamaterial units to introduce surface impedance mismatch, and then introducing stop bands in the transmission of artificial surface plasmons; and using traditional The low-pass characteristics of the artificial surface plasmon waveguide combined with the high-pass characteristics of the dielectric integrated waveguide can realize the filter with the band-pass characteristic. However, both methods need additional structures to realize the filtering characteristics.

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