Double-arm three-dimensional helical antenna capable of generating vortex waves having comb modal spectra

Abstract

The invention discloses a double-arm three-dimensional helical antenna for generating vortex waves with comb modal spectra, and belongs to the technical field of antenna technology mobile wireless communication. The antenna comprises a dielectric substrate, a metal grounding plate covering the lower surface of the dielectric substrate, a feed structure located on the upper surface of the dielectric substrate, and double-arm three-dimensional spiral metal wires which are arranged in a three-dimensional symmetry manner and have gradually increased radius. The radius of the spiral metal wires are linearly increased; when the spiral perimeter is integer multiples of the wavelength, a spiral area can generate corresponding single-mode vortex waves; when the spiral perimeter is continuously changed, adjacent modes exist, so that the vortex waves with multiple overlapped modes are generated on a single frequency point at the same time; and the overlapped modes are distributed at equal intervals to form a comb-shaped mode spectrogram, so that the degree of freedom and the complexity of generated waves can be improved.

Description

technical field [0001] The invention belongs to the technical field of antenna technology and mobile wireless communication, and specifically relates to a dual-arm three-dimensional helical antenna fed by a single port for generating vortex waves with a comb-like mode spectrum, which can be used to simultaneously generate multiple modes at a single frequency point Superimposed vortex electromagnetic waves, and these superimposed modes are distributed at equal intervals, forming a comb-like mode spectrum. Background technique [0002] In recent years, Orbital Angular Momentum (OAM: Orbital Angular Momentum) has received extensive attention and in-depth research from a large number of researchers due to the infinite nature of its modes and the orthogonality between modes. Angular momentum is composed of two parts: spin angular momentum and orbital angular momentum. The orbital angular momentum is related to the spatial phase distribution of the beam. In 1992, Dutch physicist A...

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Problems solved by technology

[0003] In 2017, in the article "Broadband Generation of Orbital Angular Momentum Carrying Beams in RF Regimes", a single-armed Archimedes planar helical antenna was used to generate vortex electromagnetic waves, but the antenna is relatively large

In 2019, Guo Zhongyi's research group used a single-arm three-dimensional helical antenna to generate three modes of vortex electromagnetic waves at three frequency points in "Generation of Continuously Variable-ModeVortex Electromagnetic Waves With Three-Dimensional Helical Antenna", but The vortex electromagnetic wave excited at a single frequency point has a single mode

In 2018, Guo Zhongyi's research group used four coaxially arranged helical antennas to generate four modes of vortex electromagnetic waves at a single frequency point in "Generation of Multi-mode Vortex Electromagnetic Waves Based on Helical Antenna", but four feeding ports, the feeding structure is complex

Afterwards, the team adopted a dual-arm helical antenna with a symmetrical structure to improve the mode purity of the generated vortex waves, but the generated mode was still a single

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