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A Linear-Circular Polarization Converter Based on Resonant Cavity Metasurface
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A metasurface and resonant cavity technology, which is applied in wireless communication, radar and microwave fields, can solve the problem of uncontrollable beam pointing
Active Publication Date: 2020-09-04
XIDIAN UNIV
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For another example, the application publication number is CN 108183291 A, and the Chinese patent titled "a transmissive multilayer polarization conversion structure based on SIW" discloses a transmissive multilayer polarization conversion structure based on SIW. By using the SIW structure in the three metal layers, the deflection of the electric field in the structure is realized, but it can only realize the conversion between linear polarizations and the beam pointing cannot be adjusted
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Embodiment 1
[0024] refer to figure 1 , the present invention includes 4×16 periodically arranged metasurface units, and the arrangement periods of the metasurface units on the x-axis and y-axis are respectively: 8.16mm and 32.64mm.
[0025] refer to figure 2 , the metasurface unit includes four metasurface subunits 1 evenly arranged.
[0026] refer to image 3 , the metasurface subunit 1, the length of four sides is p and p=8.16mm, including a dielectric substrate 11, a first metal patch 12 printed on the upper surface of the dielectric substrate 11 and a second metal patch on the lower surface Sheet 13; The relative permittivity ε of dielectric substrate 31 r = 3.5, the thickness is 3mm, the metasurface subunit 1 is adjacent to the peripheral position, is provided with 32 metallized via holes 14 connecting the first metal patch 12 and the second metal patch 13, the center of the adjacent metallized via hole The distance between them is D=1.02mm, the diameter d=0.6mm of the metallize...
Embodiment 2
[0030] Embodiment 2, the structure of this embodiment is compared with the structure in embodiment 1, only the following structure is adjusted:
[0031] The present invention includes 2×16 periodically arranged metasurface units, and the arrangement periods of the metasurface units on the x-axis and y-axis are respectively: 8.16mm and 65.28mm. The metasurface unit includes 8 evenly arranged metasurface subunits 1, with any one metasurface subunit 1 at both ends of the metasurface unit as a starting point, the opening of the square C-shaped slit 121 in the cth metasurface subunit 1 The rotation angle of the direction relative to the opening direction of the square C-shaped slit in metasurface subunit 1 at the starting position is β c , β c =(c-1)*δ', 1≤c≤8, δ'=45°.
Embodiment 3
[0032] Embodiment 3, the structure of this embodiment is compared with the structure in embodiment 1, only the following structure is adjusted:
[0033] The present invention includes 3×18 periodically arranged metasurface units, and the arrangement periods of the metasurface units on the x-axis and y-axis are respectively: 8.16mm and 48.96mm. The metasurface unit includes 6 evenly arranged metasurface subunits 1, starting from any one metasurface subunit 1 at both ends of the metasurface unit, the opening of the square C-shaped slit 121 in the cth metasurface subunit 1 The rotation angle of the direction relative to the opening direction of the square C-shaped slit in metasurface subunit 1 at the starting position is β c , βc =(c-1)*δ', 1≤c≤6, δ'=60°.
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Abstract
The invention provides a linear-circular polarization converter based on a resonant cavity metasurface, which is used for solving the problem that an existing metasurface cannot achieve dual-beam dual-circular polarization and simultaneous beam regulation and control, and comprises e*f periodically arranged metasurface units, wherein e is larger than or equal to 2, and f is larger than or equal to2; each metasurface unit comprises l metasurface subunits, wherein l is larger than or equal to 3, each metasurface subunit comprises a dielectric substrate and metal patches printed on the upper plate face and the lower plate face of the dielectric substrate, square C-shaped gaps and rectangular gaps are etched in the metal patches printed on the upper plate face and the lower plate face respectively, and a plurality of metalation via holes are formed in the position, close to the periphery, of each metasurface subunit; when the x polarized wave is propagated along the positive z axis, the transmission wave is a left-handed circular polarized wave and a right-handed circular polarized wave, and the propagation directions of the two circular polarized waves are symmetrical about the x axis. According to the invention, while dual-polarization conversion is realized, regulation and control on dual-beam pointing are realized, and the dual-beam pointing can be applied to wireless communication systems such as satellite and radar detection.
Description
technical field [0001] The invention belongs to the field of microwave technology, and relates to a linear-circular polarization converter based on a resonant cavity metasurface, which can be used in the fields of wireless communication and radar. Background technique [0002] Polarization is one of the most basic characteristics of electromagnetic waves. The common polarization methods are linear polarization, circular polarization, and elliptical polarization. Circular polarization can be further divided into left-handed circular polarization and right-handed circular polarization. In different wireless communication systems, the requirements for the polarization of electromagnetic waves are different. For example, circularly polarized electromagnetic waves are used for communication between the ground and satellites, and radar systems use two orthogonal linear polarizations or two orthogonal circularly polarized electromagnetic waves for detection and scanning. [0003] ...
Claims
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Application Information
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