A low rcs high gain circularly polarized array antenna based on polarization conversion metasurface

Abstract

The invention discloses a low-RCS high-gain circularly polarized array antenna based on a polarization conversion metasurface, which comprises an upper dielectric board, a middle dielectric board and a lower dielectric board distributed from top to bottom; the upper surface of the middle dielectric board is printed with In the super-surface structure, a metal floor is printed on the upper surface of the lower dielectric board, and a feeding structure is printed on the lower surface. The metasurface structure is composed of N×N metasurface modules; the metasurface module is composed of M×M basic units. The metal floor is etched with S×S slot antenna arrays; the slot antenna array is composed of T×T strip-shaped slots, and the feed structure is composed of S×S feed sub-units; the feed sub-unit is composed of T×T metal strips . The metasurface module, the slot antenna array and the feed sub-units are distributed in a clockwise direction along the center; the feed structure performs coaxial feed at the reserved coaxial pad. The invention realizes remarkable scattering suppression effect without reducing the radiation performance of the antenna.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a circularly polarized array antenna, in particular to a low-RCS high-gain circularly polarized array antenna based on a polarization conversion metasurface. Background technique [0002] The antenna is an indispensable external device for various wireless electronic devices. Only when the antenna works normally can the electronic device work normally as a whole. Therefore, the antenna must transmit and receive electromagnetic waves stably and effectively in a complex electromagnetic environment, and the radiation characteristics are the key to measure the quality of the antenna. The main index, for the low-scattering carrier platform, often requires the antenna installed on it to have good scattering characteristics, and the physical quantity used to measure the scattering characteristics of the target radar is the radar cross section (RCS). [0003] As a special kind of scattere...

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Problems solved by technology

However, the related technologies mentioned above are often difficult to ensure that the radiation performance of the antenna is not affected while satisfying the high-performance RCS reduction effect

In 2019, Shangyi Sun et al. published a paper titled "Ultrawideband High-Efficiency 2.5-Dimensional Polarization Conversion Metasurface and Its Application in RCS Reduction of Antenna" in IEEE Antennas and Wireless Propagation Letters. The surface is loaded in the antenna, and the simulation results show that the designed antenna can achieve RCS reduction while maintaining the antenna radiation characteristics basically unchanged, but the PCM only achieves the polarization conversion rate in the frequency range of 4.41-13.15GHz (PCR) is greater than 96%, and its antenna gain is only increased by 0.3dB

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