Method for generating structural electromagnetic beams based on partial circular traveling wave antenna theory
An electromagnetic wave and antenna technology, applied in the field of structural electromagnetic wave generation, can solve the problems of inconsistent divergence angles of different modal beams, limiting radio frequency OAM beams, and difficulty in multiplexing different modalities, avoiding black holes and divergence problems, and increasing diversity. the effect of improving the signal-to-noise ratio
Active Publication Date: 2020-06-12
ZHEJIANG UNIV
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Problems solved by technology
[0003] In recent years, many researches have been carried out on electromagnetic wave OAM. There are three inherent problems in radio frequency domain OAM beams that limit the practical application of radio frequency OAM beams. First, there is a phase singularity in the center of the beam, that is, the central energy intensity is zero. The second is beam divergence. As the propagation distance increases, the receiving aperture of the antenna becomes larger and larger. The third is that the divergence angles of beams of different modes are inconsistent, which makes it difficult to multiplex different modes.
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[0024] In this embodiment, a 90° arc traveling wave antenna with frequency f=10GHz and radius a=17.26cm is selected, and the feed-in current distribution satisfies i.e. I 0 =1, l=30. Through the numerical simulation results, the beam properties generated by the partial circular traveling wave antenna are analyzed in more detail. Such as Figure 4 As shown, it is the 3D simulation result of the beam generated under the above conditions. It can be clearly seen that the beam is a high-gain directional beam, which avoids the problem of the energy zero point in the center of the beam and the excessive diameter of the receiving port caused by the divergence of the beam. . Figure 5 The circumferential radiation pattern of the beam in polar coordinates is shown, and the tangent plane is the plane θ=60° where the maximum energy of the beam is located. Figure 6 Given the circumferential amplitude and phase distribution of the beam on the θ=60° plane, it can be seen that the beam ...
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The invention discloses a method for generating a structural electromagnetic beam based on a partial circular traveling wave antenna theory, and the method comprises the steps: enabling an antenna tobe bent into a circular arc with the radius of a, carrying out the feeding of a circular-arc-shaped antenna, and enabling the current distribution of the circular-arc-shaped antenna to meet the generation of the structural electromagnetic beam. And when the OAM modal l is a positive number and the orientation of the azimuth angle is that the OAM modal l is a negative number, the orientation of theazimuth angle is that the radius a of the arc-shaped antenna is equal to the radius required by a single-mode OAM wave beam generated by the circular traveling wave antenna. Structural electromagnetic beams generated by the invention have directional gain characteristics, vorticity and quasi-orthogonal characteristics. By applying the quasi-orthogonal gain characteristics to wireless communication, the signal-to-noise ratio of a communication system can be improved, the performance of the system is improved, the diversity of fields in space is improved due to the vorticity, and a new dimension is provided for multiplexing due to the quasi-orthogonal characteristics.
Description
technical field [0001] The invention relates to the field of structural electromagnetic wave generation, in particular to a method for generating directional beams with phase linearity within the range of a main lobe based on the theory of a partial circular traveling wave antenna. Background technique [0002] With the rapid development of the Internet and the popularity of smart terminals, especially the emergence of autonomous driving and smart homes, people's demand for large-capacity and high-speed wireless communication systems is increasing. At present, technologies to improve communication capacity based on the dimensions of electromagnetic wave frequency, polarization, amplitude, and phase have been fully developed and utilized. Electromagnetic wave Orbital Angular Momentum (OAM) emerged as a new physical dimension, which is expected to alleviate the limited The contradiction between the spectrum resources and the growing social needs. OAM is a basic attribute of e...
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IPC IPC(8): H01Q1/36H01Q1/50H01Q21/00H01Q21/20
CPCH01Q1/36H01Q1/50H01Q21/0006H01Q21/20
Inventor 王智霞郑史烈余显斌金晓峰章献民
Owner ZHEJIANG UNIV