Terahertz broadband band-stop filter based on metasurface

A band-stop filter and metasurface technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problem of structurally limited electromagnetic wave incident direction, etc., and achieve the effect of good incident angle stability and high suppression depth.

Inactive Publication Date: 2019-07-12
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the document "Self-Complementary Metasurface for Designing Narrow Band Pass / Stop Filters" proposes a material-based band-stop filter with very good filtering performance, but the structure is limited by the incident direction of electromagnetic waves

Method used

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  • Terahertz broadband band-stop filter based on metasurface
  • Terahertz broadband band-stop filter based on metasurface
  • Terahertz broadband band-stop filter based on metasurface

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Embodiment Construction

[0043] The technical solutions in the embodiments of the present invention will be described more clearly and completely below in conjunction with the accompanying drawings in the implementation of the present invention.

[0044] Such as figure 1 with figure 2 A metasurface-based terahertz broadband band-stop filter is shown, figure 1 It is a complete structural diagram of the band-stop filter of the embodiment, and the band-stop filter is formed by periodic extension of a single three-layer filtering unit. figure 2It is a structural diagram of a single filter unit, including three layers of stacked filter unit layers, from top to bottom are the first layer of filter unit layer 7, the second layer of filter unit layer 8 and the third layer of filter unit layer 9, the The filter unit layer includes a split resonator ring 4 and a dielectric layer 5, the split resonator ring 4 is placed in the center of the upper surface of the dielectric layer 5, the split resonator ring 4 i...

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Abstract

The invention discloses a terahertz broadband band-stop filter based on a metasurface. The filter comprises a plurality of stacked filter unit layers, each filter unit layer comprises a dielectric layer and an open resonant ring, namely a resonant structure, and the open resonant ring is located at the upper surface of the dielectric layer; and the open resonant ring comprises a square outer ringand a Jerusalem cooling cross unit which is located at the center of the square outer ring. Each Jerusalem cooling cross unit comprises two mutually vertical long arms, and the two ends of each long arm are connected with short arms perpendicular to the long arms. The principle of the filter is that when electromagnetic waves are incident, the Jerusalem cooling cross units and the square outer rings are equivalent to capacitors, and the electric resonance is generated between the Jerusalem cooling cross units and the incident waves. The metal arms of the metal structure between the layers cangenerate anti-parallel current and generate magnetic resonance with incident waves. The resonant wavelength of electric resonance and magnetic resonance can be controlled by adjusting the size of themetal structure, so that better filtering performance is obtained.

Description

technical field [0001] The invention relates to the field of electromagnetic wave filtering characteristics in the terahertz band, in particular to a metasurface-based terahertz broadband band-stop filter. Background technique [0002] A metasurface is an ultrathin two-dimensional array plane based on the generalized Snell's law. It is composed of metamaterial structural units, which can flexibly and effectively manipulate the phase, polarization mode, propagation mode and other characteristics of electromagnetic waves, so it has shown a wide range of applications in controllable smart surfaces, new waveguide structures, electromagnetic wave filtering and small resonant devices. prospect. [0003] Filters are mainly divided into four types: high-pass, low-pass, band-stop, and band-pass. Their main functions are to realize frequency selection, frequency division and isolation signals in communication systems. With the rapid development of wireless communication systems, the...

Claims

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Application Information

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IPC IPC(8): H01P1/20
CPCH01P1/20
Inventor 邓洪朗周绍林廖绍伟李富华苏启聪
Owner SOUTH CHINA UNIV OF TECH
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