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Large-aperture planar achromatic reflective array antenna

A technology of reflectarray antenna and achromatic aberration, which is applied in the direction of antenna, antenna parts, radiating element structure, etc., can solve the problems of unsuitable large-aperture reflectarray antenna, narrow response bandwidth and narrow effective bandwidth of metal resonant unit, and achieve It is beneficial to large-scale promotion, simple in structure and wide in working bandwidth

Active Publication Date: 2018-06-01
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the narrow response bandwidth of the metal resonant unit and the influence of transmission dispersion at different frequencies, the effective bandwidth of traditional reflectarray antennas is usually narrow
And because the unit size of the traditional reflectarray antenna is large, it is not suitable for large-aperture reflectarray antennas

Method used

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Embodiment 1

[0029] In this embodiment, an overall model of a planar achromatic reflectarray antenna with an aperture of 1.2 m based on two layers of metamaterials is designed for a frequency of 11-14 GHz. The horn antenna is used as the feed source, the radiation aperture is 1.2m×1.2m, and the distance between the horn and the metamaterial is 400mm. The dielectric plate thickness of each layer of metamaterial is 1 mm, the dielectric constant is 3.5, and the loss tangent is 0.0018. The period p of the metal resonant unit is 5 mm, the width of the metal ring is w=0.2 mm, and the thickness is 0.035 mm. The metal resonance unit used is a square metal ring, and the number of metal rings in a single period is 1 or 2. The reflective layer on the backside of the underlying metamaterial has a thickness of d1 = 0.2 mm. For a metal resonant unit with a metal ring number of 1 in a single period, the value range of the metal ring width dx1 is 2.4mm≦dx1≦4.8mm. In the actual electromagnetic simulation...

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Abstract

The invention provides a large-aperture planar achromatic reflective array antenna including a horn feed source, a multilayer metamaterial under the feed source, and a reflective layer attached to theunderlying metamaterial; wherein each layer of metamaterial includes a dielectric plate and a non-periodically arranged metal resonant element printed on the front side of the dielectric plate. By using an advantages that the electromagnetic response of the metamaterial to an incident electromagnetic wave can be artificially modulated, the required phase distribution satisfying the achromatic focusing in a certain frequency band can be obtained through an optimization algorithm, and then the response of the incident broadband electromagnetic wave is changed by using the metal resonant units with different structures according to the phase distribution so as to achieve broadband continuous achromatic focusing. The large-aperture planar achromatic reflective array antenna uses the new metamaterial structure and a phase distribution mode, has the advantages of simple structure, large aperture, large working bandwidth and low cost, and has the same response to all polarizations and is applicable to various polarization electromagnetic waves.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a large-aperture planar achromatic reflection array antenna. Background technique [0002] The traditional microwave antenna is generally composed of a metal parabola and a feed source located at the focus of the metal parabola. The high reflection characteristics of the metal parabola are used to collect the electromagnetic waves incident from the outside to the feed source or reflect the electromagnetic waves emitted by the feed source. Although this type of antenna has a simple structure and a wide operating frequency range, it is bulky, has poor concealment, is difficult to transport, and requires high processing precision for curved surface structures at high frequencies. [0003] In recent years, using metamaterials with adjustable electromagnetic properties, researchers have proposed a planar reflectarray antenna. By designing each unit in the array, it can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/36H01Q19/10
CPCH01Q1/364H01Q19/104
Inventor 沈同圣罗先刚李雄蒲明博马晓亮黄奕嘉赵泽宇
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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