Spoof surface plasmon polaritons (SSPPs) type microwave band-pass filter

Abstract

The present invention provides an SSPPs type microwave band-pass filter, and relates to the microwave filter technology field. The filter adopts a three-segment type structure, the first segment is a coplanar waveguide segment, the second segment is a transition segment transformed from the coplanar waveguide segment to an SSPPs segment, and the third segment is the SSPPs segment, wherein the SSPPs segment adopts a novel child-mother composite groove structure characterized by arranging the child groove structures which are periodic, are in mirror symmetry and are arranged parallelly in the mother grooves. By the number and the geometric sizes of the child grooves, the sub-wavelength bound effect of a microwave electric field can be improved further, and the band-notched characteristic of the SSPPs filter is more excellent. The filter can be widely used in the microwave communication systems, such as the micro-strip circuits of L-wave band to X-wave band, a microwave base station, etc.

Description

Technical field [0001] The invention relates to the technical field of microwave filters, in particular to an artificial surface plasmon type microwave bandpass filter. Background technique [0002] Surface plasmon polaritons (SPPs) are surface electromagnetic waves that propagate along the metal-dielectric interface. With the continuous improvement of the integration of microwave integrated circuits today, a series of technical problems have appeared. For example, when the line-to-line spacing in the circuit is small to a certain level, electromagnetic noise interference between lines will appear, resulting in microwave circuits or microwaves. The device is unstable. [0003] The artificial surface plasmon (Spoofsurfaceplasmon polaritons, SSPPs) circuit can localize the microwave electric field in a sub-wavelength size, so it has a good anti-electromagnetic interference ability and can well meet the requirements of the next generation of microwave communication devices. Summary ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a microwave bandpass filter composed of artificial surface plasmon type transmission line. This transmission line filter can not only solve a filter selection scheme, but also solve the problem of when the circuit center line If the distance between the line and the line is small to a certain extent, there will be electromagnetic noise interference between the line and the line, resulting in unstable operation of microwave circuits or microwave devices

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