Low radar cross section array antenna based on polarization conversion

Abstract

The invention provides a low radar cross section array antenna based on polarization conversion. The antenna comprises a polarization conversion supersurface, a first dielectric plate printed on a lower surface of the polarization conversion supersurface, and a metal floor printed on a lower surface of the first dielectric plate. A second dielectric plate and a feed network on the low surface of the second dielectric plate are arranged on the low surface of the metal floor. The polarization conversion supersurface is composed of four square polarization conversion unit groups and N polarization conversion units arranged periodically. Each polarization conversion supersurface unit is composed of a pair of L-shaped metal patches located at the edge of the polarization conversion unit and T-shaped metal patches located in the center of the polarization conversion unit, the patches being of the same structure. The facing ends of the T-shaped metal patches are parallel to each other, and opposite ends of the T-shaped metal patches are connected to the right angles of the two respective L-shaped metal patches. The low radar cross section array antenna is high in polarization conversion rate within the broadband and solves the technical problems of the reduced radar cross section and the narrow bandwidth in the prior art.

Description

technical field [0001] The invention belongs to the field of communication technology, and specifically relates to a low radar cross-section array antenna based on polarization conversion. Using a polarization conversion metasurface structure, the radar cross-section of the antenna is reduced by controlling the reflected wave amplitude and phase characteristics, which can be applied to radiation characteristics Radar systems that have requirements for both radar and scattering characteristics. Background technique [0002] In today's communication field, the antenna, as a device for transmitting and receiving signals, is an important part of the entire communication system. With the development of wireless technology, the electromagnetic environment in which the radar antenna is located is becoming more and more complex. As a communication device, its radar cross section is an important contributor to the overall radar cross section of the target. The scattering of the ante...

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Problems solved by technology

[0005] For example, Xi'an University of Electronic Science and Technology proposed a patent application titled "A microstrip antenna with ultra-wideband and low Microstrip antenna with radar section, including radiation unit, dielectric board, metal floor, coaxial joint and polarization conversion surface; the upper surface of the dielectric board is printed with radiation unit and polarization conversion surface, and the lower surface is printed with metal floor, polarized The polarization conversion surface is composed of four polarization conversion unit groups with a square area in the middle; each polarization conversion unit group contains several decreasing fractal units, and the arrangement directions of the decreasing fractal units in adjacent polarization conversion unit groups differ by 90° , the existing microstrip antenna has achieved a cross-polarized reflection coefficient of more than 80% in the working frequency band of the 10.45GHz-34.15GHz frequency band (relative bandwidth 101.9%), but the existing antenna has a low polarization conversion rate technology question

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