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CN-122000700-A - Focusing super-surface lens with anti-shielding function

CN122000700ACN 122000700 ACN122000700 ACN 122000700ACN-122000700-A

Abstract

The invention belongs to the technical field of super-surface and plane lenses, and particularly relates to a focusing super-surface lens with an anti-shielding function, which consists of 40 multiplied by 40 units with a period of 7.5mm, wherein each unit comprises a top metal annular patch, a dielectric layer and a bottom metal patch, the relative dielectric constant of a dielectric substrate is 2.65, anisotropic response is realized by the unit through circumferential notch design, a mirror inversion structure is adopted to form a stable 180 DEG phase difference, the 1-bit phase modulation requirement is met, an array radially performs phase encoding according to Airy functions, hollow annular layout is adopted, the self-bending and self-repairing characteristics of Airy beams are effectively utilized, physical shielding of an axis area can be bypassed by electromagnetic waves, field intensity reconstruction is realized at a set focus, and the design can remarkably improve the focusing gain and energy recovery capability of a system under a shielding environment while keeping high cross polarization conversion efficiency in Ku frequency band application of 13GHz and the like.

Inventors

  • ZHANG KUANG
  • ZHAO HONGXUAN
  • Yuan Lechi
  • LI JINXING

Assignees

  • 哈尔滨工业大学

Dates

Publication Date
20260508
Application Date
20260331

Claims (8)

  1. 1. The focusing super-surface lens with the shielding resistance function is characterized by comprising a plurality of 1bit super-surface units, wherein the 1bit super-surface units are in an annular hollow array; The 1bit super surface unit comprises a top metal patch structure, a dielectric layer and a bottom patch structure; The top metal patch and the bottom metal patch are of asymmetric split resonant ring structures with circumferential notches; the included angle between the middle line of the gap of the top metal patch and the middle line of the gap of the bottom metal patch is 90 degrees; The annular hollow array performs phase encoding according to the symbol distribution of the Airy function in the radial direction.
  2. 2. A focusing super-surface lens with anti-shielding function as set forth in claim 1, wherein the center-to-center distance between two adjacent 1bit super-surface units is 7.5mm.
  3. 3. The focusing ultra-surface lens with anti-blocking function as set forth in claim 1, wherein the dielectric layer has a thickness of 1.5mm.
  4. 4. The focusing ultra-surface lens with anti-shielding function as set forth in claim 1, wherein the dielectric layer material is F4B material with a relative dielectric constant of 2.65.
  5. 5. The focusing super surface lens with shielding resistance as set forth in claim 1, wherein the outer diameter of the top metal patch structure and the bottom patch structure is 3.6mm, the ring width is 1.1mm, the notch width is 0.9mm, and the thickness is 0.035mm.
  6. 6. The focusing ultra-surface lens with anti-shielding function as set forth in claim 1, wherein the top metal patch structure and the bottom patch structure are made of copper foil.
  7. 7. The focusing ultra-surface lens with anti-blocking function as set forth in claim 1, wherein the annular hollow array is phase-coded in radial direction according to the sign distribution of Airy function, and the phase function is expressed as: 。
  8. 8. A focusing ultra-surface lens with anti-blocking function as set forth in claim 1, wherein the annular hollow array has a diameter of 300mm.

Description

Focusing super-surface lens with anti-shielding function Technical Field The invention belongs to the technical field of super-surface and plane lenses, and particularly relates to a focusing super-surface lens with an anti-shielding function. Background In the fields of microwave antennas and electromagnetic regulation, the super surface is regarded as a two-dimensional planar array formed by artificial microstructures with sub-wavelengths, and attention is paid to realizing flexible regulation and control of electromagnetic wave phases, amplitude values and polarization states because the super surface can break through the limit of traditional materials. Particularly in the Ku-band satellite communication and radar system, the super-structured lens gradually replaces the traditional refractive lens with huge volume and heavy weight by virtue of ultra-thin, light weight and easy integration. However, conventional transmissive focusing systems generally employ solid array structures whose energy contribution is primarily concentrated in the central region. However, in an actual installation scene, a feed source bracket, a radio frequency front end component or a protective metal baffle is often arranged in front of a focus, and the physical barriers can directly shield a main propagation path of electromagnetic waves, so that serious distortion, gain dip and signal transmission reliability reduction occur in energy distribution at the focus. Although there have been some studies on anti-occlusion designs, most rely on complex algorithmic optimization or active devices, and it is difficult to effectively recover the occluded field strength while maintaining structural simplicity. In recent years, special beams with non-diffraction characteristics, airy beams, provide new physical ideas for solving the problems. The Airy beam possesses unique self-bending and self-repairing properties that enable the wavefront to be reconstructed while bypassing obstacles during propagation. However, how to combine the complex phase distribution of the Airy beam with the 1bit (0/1) coding technology and realize efficient cross polarization conversion and anti-occlusion focusing under the layout of the hollow annular array, a systematic solution which has a simple structure, strong engineering robustness and is suitable for the Ku frequency band is still lacking at present. Therefore, the 1bit transmission type super surface which can simplify the manufacturing process and realize the focus energy recovery under the extreme environment by utilizing the Airy beam characteristics is developed, and has important application value for improving the environment adaptability of a microwave communication system. Disclosure of Invention The invention aims to provide a focusing super-surface lens with an anti-shielding function, which can effectively utilize the self-bending and self-repairing characteristics of Airy beams, so that electromagnetic waves can bypass the physical shielding of an axis region, realize field intensity reconstruction at a set focus, and can remarkably improve focusing gain and energy recovery capability of a system in a shielding environment while keeping high cross polarization conversion efficiency in Ku frequency band application such as 13 GHz. The technical scheme adopted by the invention is as follows: A focusing super-surface lens with an anti-shielding function comprises a plurality of 1bit super-surface units, wherein the 1bit super-surface units are in an annular hollow array; The 1bit super surface unit comprises a top metal patch structure, a dielectric layer and a bottom patch structure; The top metal patch and the bottom metal patch are of asymmetric split resonant ring structures with circumferential notches; the included angle between the middle line of the gap of the top metal patch and the middle line of the gap of the bottom metal patch is 90 degrees; The annular hollow array performs phase encoding according to the symbol distribution of the Airy function in the radial direction. Further, the center distance between two adjacent 1bit super surface units is 7.5mm. Further, the thickness of the dielectric layer is 1.5mm, and the dielectric layer material is F4B material with a relative dielectric constant of 2.65. Further, the outer diameters of the top metal patch structure and the bottom patch structure are 3.6mm, the ring width is 1.1mm, the notch opening width is 0.9mm, the thickness is 0.035mm, and the top metal patch structure and the bottom patch structure are made of copper foil. The invention has the technical effects that: The focusing super-surface lens with the shielding resistance can realize high-efficiency cross polarization conversion and phase regulation through a 1bit structure with mirror image inversion, aims to utilize the special self-bending and self-repairing physical mechanism of circular Airy beams, is matched with the hollow annular array layout, so that electroma