Low-RCS phased-array antenna and RCS reduction method thereof

Abstract

The invention provides a low-RCS phased-array antenna and an RCS reduction method thereof. Each antenna unit comprises four layers of structures, namely, a radiation patch layer, a cross-shaped feed structure layer, a floor layer and a direct-current feed layer, and every two adjacent layers are separated through a dielectric substrate. Switching among antenna circular polarization modes and switching among antenna feed points are achieved by controlling on-off of PIN diodes, so that the effect of equivalent rotation of the antenna units in the horizontal direction is achieved, and a phase difference of 180 degrees, which is twice of the rotation angle, of the scattering fields of the antenna units is achieved. The scattering fields of the antenna units are counteracted in a far field anddispersed to a wider angular domain space, so that the RCS of the array antenna is reduced. The scattering phases of the antenna units are directly controlled, so that the scattering fields of the array elements cannot be coherently superposed or reflected to a threat-free angle, and the RCS of the array is reduced.

Description

technical field [0001] The invention relates to the field of phased array design, and in particular proposes an effective method for reducing the RCS of the phased array antenna. Background technique [0002] In today's high-tech information warfare, stealth design, as an important part, has important and far-reaching significance for the survivability and combat effectiveness of future weapons and equipment. Anti-enemy camouflage is one of the most important issues in military radar and equipment design. In the electromagnetic wave band, the stealth performance of an object is characterized by its radar cross section (Radar Cross Section, RCS). The smaller the RCS, the easier it is for enemies to hide. Based on the purpose of camouflage, adsorbent materials can be used in the ammunition body, or its physical structure can be modified to achieve the effect of radiation wave deviation, making it impossible for enemy radar to detect it. [0003] Phased array antennas are ind...

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Problems solved by technology

However, broadband impedance matching for radar absorption is difficult to achieve and easily detected by infrared detection devices

The second method is to change the shape of the target. By shaping the antenna, the electromagnetic scattering deviates from the incident direction and reduces the scattering field in the source direction, but this may destroy the aerodynamic layout and increase the complexity of the shape design.

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