Broadband circularly polarized frequency scanning metasurface
A technology of frequency scanning and circular polarization, which is applied in the fields of terahertz imaging, target detection and wireless communication, can solve the problems of increasing the difficulty of circularly polarized antenna design and complex antenna structure, and achieve simple design, mature technology and high resolution Effect
Active Publication Date: 2020-04-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
Traditional circularly polarized antennas usually need to design the linearly polarized feeding part to generate equal-amplitude orthogonal linearly polarized waves, thereby generating circularly polarized radiation, which not only increases the difficulty of circularly polarized antenna design, but also may make The whole antenna structure is more complex
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[0034] A more specific implementation is as follows:
[0035] The schematic diagram of the overall design scheme is as follows figure 2 ,include:
[0036] The metal bottom plate is made of metal aluminum, silver, gold and other good conductors.
[0037] Dielectric substrate, the material is PI,
[0038] The metal patch material is Au, Ag, Cu or Al.
[0039] image 3Indicates the reflection phase curve of each unit in a right-handed circularly polarized wave within a period. In the 1-2.1THz frequency band, the phase difference between two adjacent curves is 45 degrees, and all curves are smooth and well maintained Excellent linearity, 360° phase shift can be realized, its relative bandwidth is 71%, and the frequency range is wide.
[0040] Figure 4 It shows the reflection amplitude characteristic diagram of each unit in a right-handed circularly polarized wave within a period. In the working range of 1-2.1THz, the reflection efficiency of 8 units is greater than 0.9, th...
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The invention discloses a broadband circularly polarized frequency scanning metasurface, which relates to a wireless communication technology. The broadband circularly polarized frequency scanning metasurface comprises phase shifting units arranged according to an M*N array, each phase shifting unit comprises a metal bottom plate and a dielectric substrate which are arranged in an overlapped mode,a phase shifting structure is arranged on the upper surface of each dielectric substrate, and the phase shifting structures of the phase shifting units in the same column are the same; the phase shift structure comprises an I-shaped grid bar and rectangular auxiliary grid bars symmetrically arranged on the two sides of the I-shaped grid bar, the I-shaped grid bar comprises two transverse grid barparts and a longitudinal grid bar part, the transverse grid bar is perpendicular to the longitudinal grid bar, and the long axes of the two auxiliary grid bars are parallel to the long axis of the longitudinal grid bar. The long axes of the longitudinal grid bars are taken as symmetric axes, and the phase shift structure is an axisymmetric structure; and in the same row, an included angle betweenthe symmetry axis of the phase shift structure and the column line is (n-1)*180 / N. According to the invention, a multi-resonance composite structure is adopted, and the high reflection efficiency ofthe unit in a broadband range is maintained by adjusting the size of the unit.
Description
technical field [0001] The invention relates to terahertz imaging, target detection and wireless communication technologies. [0002] technical background [0003] Terahertz (THz) wave is a new type of electromagnetic spectrum that needs to be developed urgently. It usually refers to electromagnetic waves with frequencies ranging from 0.1 THz to 10 THz. This frequency range lies between millimeter waves, infrared, and light, and has many unique electromagnetic properties. Therefore, it has extremely important potential application value in the fields of physics, chemistry, electronic information, imaging, life science, material science, astronomy, atmospheric and environmental monitoring, national security and anti-terrorism, communication and radar. [0004] A metamaterial is an artificial structure composed of periodic or non-periodic subwavelength units with extraordinary electromagnetic properties. The metasurface can be equivalent to a two-dimensional metamaterial, whi...
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IPC IPC(8): H01Q15/24H01P1/18
CPCH01P1/18H01Q15/244
Inventor 杨梓强肖冰连兰峰史宗君
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA