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CN-122000699-A - Multiband microwave super surface absorber

CN122000699ACN 122000699 ACN122000699 ACN 122000699ACN-122000699-A

Abstract

The application discloses a multiband microwave super-surface absorber, which relates to the technical field of microwave functional devices and comprises a plurality of unit structures which are periodically arranged, wherein each unit structure comprises a metal grounding layer, a middle dielectric layer and a top metal resonance structure which are arranged from bottom to top, each top metal resonance structure comprises a peripheral closed ring and a metal cross structure which is arranged in the center of the peripheral closed ring, the peripheral closed ring is formed by connecting four square metal rings end to end, and the size of each square metal ring and the size of the metal cross structure are configured to enable the absorber to excite at least two resonance absorption peaks with quality factors which are larger than 400 in a microwave frequency range from 8GHz to 20 GHz. The application meets the dual requirements of multi-band coverage and high frequency selectivity at the same time.

Inventors

  • ZHOU QIANGGUO
  • DAI YIMING
  • HAN QING
  • LI XIAOXIAO
  • WANG HAOYI

Assignees

  • 蚌埠医科大学

Dates

Publication Date
20260508
Application Date
20260313

Claims (10)

  1. 1. The multiband microwave super-surface absorber is characterized by comprising a plurality of unit structures which are periodically arranged, wherein each unit structure comprises a metal grounding layer, an intermediate dielectric layer and a top metal resonance structure which are arranged from bottom to top; the top-layer metal resonance structure comprises a peripheral closed ring and a metal cross-shaped structure arranged in the center of the peripheral closed ring, wherein the peripheral closed ring is formed by connecting four square metal rings end to end; The dimensions of each square metal ring and the dimensions of the metal cross-shaped structure are configured such that the absorber excites at least two resonant absorption peaks with quality factors each greater than 400 in the microwave frequency range of 8GHz to 20 GHz.
  2. 2. The multiband microwave subsurface absorber according to claim 1, wherein the period of the unit structure is 8mm, and the thickness of the intermediate dielectric layer is 3mm.
  3. 3. The multiband microwave subsurface absorber according to claim 1, wherein the peripheral closed ring has a side length of 7.2mm.
  4. 4. The multiband microwave subsurface absorber according to claim 1, wherein the width of the metal wire of the metal cross-shaped structure is 0.4mm, the width of the metal wire of the outer side frame of the square metal ring is 0.4mm, and the width of the metal wire of the inner side frame of the square metal ring is 0.5mm.
  5. 5. The multiband microwave subsurface absorber according to claim 1, wherein the material of the metallic ground layer and the top layer metallic resonant structure is gold and the material of the intermediate dielectric layer is silicon.
  6. 6. The multiband microwave subsurface absorber according to claim 1, wherein there is no electrical connection between the metallic cross-shaped structure and the peripheral closed ring.
  7. 7. The multiband microwave subsurface absorber according to claim 1, wherein the absorber excites six resonant absorption peaks in the frequency band of 8GHz to 20 GHz.
  8. 8. The multiband microwave subsurface absorber according to claim 7, wherein absorption frequency points of six resonant absorption peaks are 11.876GHz, 14.216GHz, 15.992GHz, 16.58GHz, 18.548GHz and 19.469GHz, respectively.
  9. 9. The multiband microwave subsurface absorber according to claim 7, wherein at least one of the six resonant absorption peaks has a figure of merit greater than 1000.
  10. 10. The multiband microwave subsurface absorber according to claim 1, wherein the thickness of both the metallic ground layer and the top layer metallic resonant structure is 30 μm.

Description

Multiband microwave super surface absorber Technical Field The application relates to the technical field of microwave functional devices, in particular to a multiband microwave super-surface absorber. Background The microwave super-surface absorber is used as an artificially designed two-dimensional electromagnetic structure, can efficiently absorb incident electromagnetic waves in a specific frequency band, and has wide application in the fields of radar stealth, electromagnetic compatibility, sensing detection, communication systems and the like. The performance core indexes include absorption rate, operating band and frequency selectivity. In recent years, research into super surface absorbers has progressed significantly. Some metamaterial absorbers realize high absorption at a single frequency point, but have low quality factor (Q value), limited frequency selectivity and difficult distinction between closely adjacent frequency signals. Subsequently, researchers have explored multiband and tunable absorbers, such as graphene-based supersurfaces, to enable switching of absorption modes. However, the related art still faces challenges that single frequency absorbers cannot meet the requirement of multi-band systems, and common multi-band or broadband absorbers have a relatively wide resonance peak (low Q value), resulting in poor isolation between different frequency bands, and signals are prone to mutual interference, which severely limits their use in applications requiring high precision frequency resolution (e.g., precise spectrum sensing, multi-frequency communication channel filtering). Therefore, the development of the super-surface absorber which can cover a plurality of common frequency bands for communication and has extremely high frequency selectivity has important practical application value and urgent technical requirements. Disclosure of Invention The application aims to provide a multiband microwave super-surface absorber, which realizes excitation of a plurality of sharp resonance absorption peaks with high Q values in a wide frequency range, thereby simultaneously meeting the dual requirements of multiband coverage and high frequency selectivity. In order to achieve the above object, the present application provides the following. The application provides a multiband microwave super-surface absorber, which comprises a plurality of unit structures which are periodically arranged, wherein each unit structure comprises a metal grounding layer, a middle dielectric layer and a top metal resonance structure which are arranged from bottom to top; the top-layer metal resonance structure comprises a peripheral closed ring and a metal cross-shaped structure arranged in the center of the peripheral closed ring, wherein the peripheral closed ring is formed by connecting four square metal rings end to end; The dimensions of each square metal ring and the dimensions of the metal cross-shaped structure are configured such that the absorber excites at least two resonant absorption peaks with quality factors each greater than 400 in the microwave frequency range of 8GHz to 20 GHz. In one embodiment, the period of the unit structure is 8mm, and the thickness of the intermediate dielectric layer is 3mm. In one embodiment, the peripheral closed ring has a side length of 7.2mm. In an embodiment, the width of the metal wire of the metal cross structure is 0.4mm, the width of the metal wire of the outer side frame of the square metal ring is 0.4mm, and the width of the metal wire of the inner side frame of the square metal ring is 0.5mm. In an embodiment, the metal grounding layer and the top metal resonant structure are made of gold, and the intermediate dielectric layer is made of silicon. In one embodiment, there is no electrical connection between the metal cross-shaped structure and the peripheral closed ring. In one embodiment, the absorber excites six resonant absorption peaks in the frequency range of 8GHz to 20 GHz. In one embodiment, the absorption frequency points of the six resonance absorption peaks are 11.876GHz, 14.216GHz, 15.992GHz, 16.58GHz,18.548GHz and 19.469GHz, respectively. In one embodiment, at least one of the six resonant absorption peaks has a figure of merit greater than 1000. In one embodiment, the thicknesses of the metal ground layer and the top metal resonant structure are both 30 μm. According to the specific embodiment provided by the application, the application discloses the following technical effects: The application discloses a multiband microwave super-surface absorber, wherein a top metal resonance structure in each unit structure can effectively excite at least two independent resonance absorption peaks in a wide frequency range of 8 GHz-20 GHz, completely cover X, ku wave bands and extend to K wave bands, meanwhile, the quality factors (Q values) of the resonance absorption peaks are all more than 400, the frequency selectivity of the microwave super-surface absorber