A dual-polarization unit based on surface wave and Lunberg lens based on the unit

Abstract

The invention relates to the field of passive devices, and discloses a surface wave-based dual-polarization unit and a Lunberg lens based on the unit, wherein the surface-wave-based dual-polarization unit passes through a three-layer patch dielectric plate and a metallized through hole Form two stacked mushroom-shaped structures, which are integrated with the patch structure to support dual-polarized electromagnetic wave modes. Among them, the mushroom-shaped structure supports vertically polarized electromagnetic wave modes, while the three-layer patch structure supports horizontally polarized electromagnetic wave modes. , the Lunberg lens based on the dual-polarization unit, the lens is distributed with several hexagonal units according to the gradient refractive index to meet the refractive index distribution law of the Lunberg lens, and can support polarization parallel and perpendicular to the substrate surface at the same time The direction of the electric field vector, so it can simultaneously converge the electromagnetic waves of the horizontal polarization and vertical polarization modes.

Description

technical field [0001] The invention relates to the field of passive devices, in particular to a surface wave dual-polarization unit and a Lunberg lens based on the unit. Background technique [0002] Lens is a passive device used to control the phase distribution of electromagnetic waves, and has been widely used in the design of antennas, feeding networks and other devices. For millimeter-wave wireless communication systems, lens antennas can meet the requirements of high gain, low cost, broadband, low complexity, multi-polarization, and multi-beam radiation. A Luneberg lens is a typical structure with a spherically symmetric gradient-index (GRIN), with one focus on the surface of a sphere and the other at infinity in space. Due to the characteristics of the gradient refractive index distribution in the sphere, the traditional Lunberg lens is an artificially designed three-dimensional structure, which is not outstanding in terms of lens size, weight and cost. In order to...

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Problems solved by technology

[0006] For the Lunberg lens based on the equivalent medium, although the Lunberg lens supporting a single polarization mode can be designed by drilling air via holes on the substrate, due to the different responses of the air via holes to different polarization electric fields, another Electromagnetic waves in one polarization mode cannot be well converged by the lens, so this method is not conducive to the design of dual polarization lenses

[0007] In summary, although the existing two-dimensional Lunberg lens method achieves high gain and multi-beam performance of the lens, it is difficult to take into account the performance of dual polarization, profile, size and cost in practical applications.

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