Miniaturized high-gain circularly polarized antenna based on metamaterial

Abstract

The invention discloses a miniaturized high-gain circularly polarized antenna based on a metamaterial. The antenna comprises a feeding connection port, a metal floor, a feeding coaxial line arranged on the metal floor, and a butterfly dipole structure connected with the feeding coaxial line. The butterfly dipole structure comprises a pair of dipole arms symmetrically arranged with respect to the feeding coaxial line, and each dipole arm is vertically connected with a thin plate, and the thin plate is connected to the metal floor. An open resonant cavity structure is formed among the pluralityof thin plates and the metal floor. The antenna can achieve high gain while achieving miniaturization, and is advantageous for scene applications with small size and high gain.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a metamaterial-based miniaturized high-gain circularly polarized antenna. Background technique [0002] As an indispensable and important component in systems such as wireless communication systems and radar systems, antenna performance determines the performance and quality of the entire wireless system. With the comprehensive advancement of wireless communication technologies represented by 5G and the Internet of Things, it is urgent to develop high-quality antenna components suitable for their application scenarios. As an important branch of antennas, circularly polarized antennas are widely used in mobile communications, millimeter wave communications, satellite communications, and electronic countermeasures. [0003] At present, the commonly used circularly polarized antennas can be roughly divided into orthogonal dipole-to-circularly polarized antennas, microstrip circula...

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Problems solved by technology

This type of antenna is limited by the dipole structure and the placement of the reflective floor, and has disadvantages such as large antenna volume; at the same time, it is limited by the gain of a single dipole antenna, and the overall gain of the antenna is not high; in the existing design, In order to realize the fixing of the antenna, etc., a dielectric substrate is used as a support, which introduces disadvantages such as dielectric loss and increased production cost.

[0004] As far as the commonly used microstrip circularly polarized antenna is concerned, due to the limitations of the structure and principle of the microstrip antenna, there are shortcomings such as narrow antenna bandwidth; for the microstrip patch antenna that uses a dielectric for miniaturization design, dielectric loss will be introduced , to reduce the antenna gain; for the microstrip circular polarization scheme of double-feed and multi-feed points, it is necessary to build a feed network, which has disadvantages such as large size

[0005] As far as the commonly used helical antenna is concerned, the helical antenna is limited by the mechanism of circular polarization and has disadvantages such as large volume; at the same time, the antenna has a single structure and has disadvantages such as inflexible design

[0006] For the circularly polarized horn antennas commonly used at present, the high directivity and gain of the horn antenna are based on the large size, so the horn antenna has the disadvantage of large volume; the realization of the circular polarization of the horn antenna is based on the circular polarization On the polarizer, the circular polarizer is difficult to process and adjust in the horn antenna, and there are disadvantages such as difficult processing

[0007] As far as the commonly used circularly polarized surface patch circularly polarized antenna is concerned, the circularly polarized surface needs to be placed at a height of a quarter of the wavelength from the radiation direction of the antenna, which increases the profile of the antenna; at the same time, in order to obtain a good circular Polarization effect requires placing a large area of ​​circularly polarized surface, so there is a disadvantage of large volume; at the same time, the gain of the antenna is limited by the radiation of the patch radiation source, so the gain is limited

[0008] To sum up, the currently commonly used orthogonal dipole pair antennas are limited by their own performance and the principle of circular polarization, and have disadvantages such as large physical size, limited gain, and difficulty in miniaturization; microstrip circularly polarized antennas are limited For microstrip antenna elements, there are disadvantages such as narrow antenna working bandwidth and insufficient gain; helical antennas, which rely on the axial working mode, have disadvantages such as large volume and low design flexibility; circularly polarized horn antennas have large volume , Difficult processing and other disadvantages; Circularly polarized surface patch circularly polarized antennas are limited by the application requirements of circularly polarized surfaces, and have disadvantages such as large antenna size and low gain.

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