A low rcs phased array antenna and rcs reduction method

Abstract

The invention provides a phased array antenna with low RCS and a method for reducing RCS thereof. The antenna unit includes a four-layer structure: a radiation patch layer, a cross-shaped feed structure layer, a floor layer, a DC feed layer, and two adjacent layers They are separated by a dielectric substrate; the switching of the circular polarization mode of the antenna and the switching of the antenna feeding point are realized by controlling the on-off of the PIN diode, so as to achieve the effect of equivalent rotation of the antenna unit in the horizontal direction, thereby realizing the antenna unit The scattering field obtains a phase difference of 2 times the rotation angle, that is, 180°; the scattering field of the antenna unit is canceled in the far field and dispersed to a wider angular space, thereby reducing the RCS of the array antenna. The present invention directly affects the scattering of each antenna unit The phase is controlled so that the scattered fields of each array element cannot be coherently added or reflected to a non-threatening angle, thereby reducing the array RCS.

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...

AI Technical Summary

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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