CN-122026116-A - All-phase gradient ultra-narrow-band transmission type cross polarization conversion super-surface

CN122026116ACN 122026116 ACN122026116 ACN 122026116ACN-122026116-A

Abstract

The invention relates to a full-phase gradient ultra-narrow band transmission type cross polarization conversion super-surface, which belongs to the technical field of electromagnetic wave metamaterials and comprises a plurality of unit cell units, wherein each unit cell unit comprises a third metal patch layer, a second intermediate medium layer, a second metal patch layer, a first intermediate medium layer and a first metal patch layer, each first metal patch layer comprises a first round patch, a first open resonance ring and a second open resonance ring, two openings of the first open resonance ring and two openings of the second open resonance ring are distributed in an orthogonal mode, and the specific structure of each third metal patch layer is identical to that of each first metal patch layer. The invention integrates the characteristics of ultra-narrow band, transmission type cross polarization conversion, full-phase gradient, polarization insensitive transmission and the like on the same super surface, reduces the volume and complexity of an electromagnetic system, facilitates the system integration and widens the application scene.

Inventors

LI SIJIE
CHANG LIANG
ZHANG QI
HU MINGHAO

Assignees

上海华大九天信息科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260326

Claims (10)

1. An all-phase gradient ultra-narrow band transmission type cross polarization conversion super-surface is characterized in that: The super surface comprises a plurality of unit cell units, wherein the side length of each unit cell unit is a; The structure of the unit cell unit sequentially comprises a third metal patch layer, a second intermediate dielectric layer, a second metal patch layer, a first intermediate dielectric layer and a first metal patch layer from bottom to top; The first metal patch layer comprises a first circular patch, a first split resonant ring and a second split resonant ring; the radius of the first round patch is R0; the circle centers of the first open resonance ring and the second open resonance ring are coincident with the circle center of the first circular patch; The first split resonant ring has a radius of R1, a ring width of W1 and two openings symmetrically distributed relative to the circle center; The second split resonant ring has a radius of R2, a ring width of W2 and two openings symmetrically distributed relative to the circle center; The two openings of the first split-ring resonator and the two openings of the second split-ring resonator are orthogonally distributed at 90 degrees; The central angle of each opening is psi; the second metal patch layer comprises a second round patch; the radius of the second round patch is R0; The third metal patch layer comprises a third circular patch, a third open resonance ring and a fourth open resonance ring, and the specific structure of the third metal patch layer is the same as that of the first metal patch layer.
2. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: the third metal patch layer, the second metal patch layer and the first metal patch layer are all positioned at the center of the unit cell, and the circle centers are coaxial.
3. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: the two opening positions of the third opening resonance ring are the same as the two opening positions of the first opening resonance ring; The two opening positions of the fourth opening resonance ring are the same as the two opening positions of the second opening resonance ring.
4. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: the first metal patch layer, the second metal patch layer and the third metal patch layer are made of metal materials, and the surfaces of the first metal patch layer, the second metal patch layer and the third metal patch layer are plated with gold; the metallic material comprises copper or silver and has a thickness of 0.035mm.
5. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: the first intermediate dielectric layer and the second intermediate dielectric layer are made of low-loss tangent materials, and the thickness range is 0.2 mm-10 mm; The low loss tangent material comprises Tacouc RF-35, PTFE, rogers series plates or cycloolefin copolymers.
6. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface as claimed in claim 5, wherein: The cycloolefin copolymer has a relative dielectric constant εr=2.34 and a loss tangent tan δ=0.007.
7. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: the unit cells are repeatedly arranged along the x direction and the y direction to form a two-dimensional unit cell array, so that a super surface is formed; the super surface is used for converting the transmission wave into a cross polarized wave corresponding to the incident wave when the incident wave is vertically incident; the incident wave comprises an x-direction linear polarized wave, a y-direction linear polarized wave, a oblique polarized wave, a left-hand circularly polarized wave or a right-hand circularly polarized wave.
8. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: The super surface contains two adjacent unit cells with geometric phase difference delta phi, and the unit cells are used for rotating the wave plane phase of the transmitted wave by 2 delta phi degrees.
9. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: the super surface comprises c rows of gradient groups with the same structure, which are sequentially adjacent along the y direction; each gradient group comprises n unit cells which are adjacent in sequence along the x direction, wherein the geometric phase difference delta phi = 180 °/n of the adjacent n unit cells; the super surface is used for deflecting the phase of the transmitted wave according to a gradient; Wherein c and n are positive integers.
10. An all-phase-gradient, ultra-narrow-band transmissive cross-polarization conversion subsurface according to claim 1, wherein: the super surface comprises c rows which are sequentially adjacent along the y direction and have the same gradient row structure; each gradient row comprises d gradient groups which are adjacent in sequence along the x direction; Each gradient group comprises 5 unit cells which are adjacent in sequence along the x direction, wherein the geometric phase difference delta phi = 36 DEG of the adjacent 5 unit cells; the super surface is used for deflecting the phase of the transmitted wave according to a gradient; Wherein c and d are positive integers.

Description

All-phase gradient ultra-narrow-band transmission type cross polarization conversion super-surface Technical Field The invention belongs to the technical field of electromagnetic wave metamaterial, and particularly relates to an all-phase gradient ultra-narrow-band transmission type cross polarization conversion super-surface. Background Polarization (also called polarization) is one of the most core physical characteristics of electromagnetic waves, and plays a vital role in transmission, regulation and control of electromagnetic waves and various application scenes. The polarization conversion process of electromagnetic waves generally needs to rely on materials with larger optical rotation characteristics, but the materials naturally existing in nature generally have the problem of weaker optical rotation, and cannot realize miniaturized design comparable to wavelength, so that the requirements of modern microwaves and optical systems on miniaturized devices and high performance are difficult to meet. In recent years, artificial electromagnetic synthetic materials with sub-wavelength dimensions (hereinafter referred to as metamaterials or super surfaces) have been widely studied and applied in the field of polarization conversion because of their advantages of easy realization of precise manipulation of electromagnetic wave surfaces. The transmission cross polarization conversion super surface mentioned herein specifically refers to a super surface structure capable of converting an incident electromagnetic wave into a transmitted electromagnetic wave crossing a polarization direction thereof in a transmission operation mode, for example, conversion from an x polarized incident wave into a y polarized transmitted wave, conversion from a left-handed circularly polarized incident wave into a right-handed circularly polarized transmitted wave, and the like can be realized. The core design concept of the phase gradient super-surface is to form continuous or discrete phase gradients in the planar direction of the super-surface by spatially and orderly arranging sub-wavelength units with different phase delay characteristics. The super-surface can freely regulate and control the propagation direction and wave front form of electromagnetic waves, so that the super-surface has wide application prospect in a plurality of technical fields such as abnormal reflection, abnormal transmission, surface wave coupling, polarization modulation and the like. The core principle of wave front regulation is based on the generalized Snell's law, and the propagation direction of electromagnetic wave can be changed randomly by reasonably designing the phase gradient difference, so that the functions of abnormal reflection/refraction, beam deflection, focusing, vortex beam formation and the like are realized. In addition, the ultra-narrow band ultra-surface can effectively break through the bandwidth limitation of the traditional microwave optical structure by virtue of the unique structural characteristics, and can realize efficient spectrum selection, high Q value resonance and generation of a strong local field by carrying out accurate design in the sub-wavelength structure, so that the applicability of the ultra-surface in high-frequency and narrow-band application scenes is further expanded. However, in the prior art, there are no related technical solutions that can integrate various key characteristics such as ultra-narrow band, cross polarization conversion, phase gradient, transmission type transmission, polarization insensitive transmission, etc. into the same super-surface structure, and there are many technical short plates. The traditional polarization conversion surface can only realize the conversion of polarization directions, and cannot accurately regulate and control electromagnetic wave beams in a local area, the traditional phase gradient super surface is generally constructed by adopting a design mode of introducing geometric phases and rotating an anisotropic unit, but the design mode has insensitivity to wavelengths and is difficult to realize narrow-band spectrum control, and the defects of the prior art lead to single function and low integration level of related super surface devices, cannot meet the development requirements of a modern electromagnetic system on miniaturization, multifunction and high integration of the devices, and severely restrict the popularization and application of the super surface in high-end electromagnetic equipment. Disclosure of Invention In order to solve the problems, the invention discloses a full-phase-gradient ultra-narrow-band transmission type cross polarization conversion super-surface, which solves the technical problem that the characteristics of ultra-narrow-band, transmission type cross polarization conversion, phase gradient, polarization insensitive transmission and the like cannot be integrated on the same super-surface in the prior art, realizes multifunctiona