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A reflective broadband 4-bit encoded metasurface for broadband rcs reduction

A 4-bit, metasurface technology, applied in the field of communication, can solve problems such as narrow bandwidth limit applications

Active Publication Date: 2021-03-30
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the microwave band, there are already some artificial magnetic conductors (AMC) for RCS reduction, but the narrow bandwidth of AMC limits its application

Method used

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  • A reflective broadband 4-bit encoded metasurface for broadband rcs reduction
  • A reflective broadband 4-bit encoded metasurface for broadband rcs reduction
  • A reflective broadband 4-bit encoded metasurface for broadband rcs reduction

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Embodiment Construction

[0023] The structure, principle and implementation of the present invention will be further explained below in conjunction with the accompanying drawings.

[0024] A metasurface is a subwavelength structure that can manipulate electromagnetic waves to obtain electromagnetic properties that do not exist in natural materials. Compared with three-dimensional metamaterials, metasurfaces have the advantages of easy fabrication, low complexity, and small thickness, so they have more potential applications in microwave, terahertz, and optical fields. Although periodicity is not a necessary condition for metasurfaces, many designs are based on periodic cells to control wave propagation, scattering, and polarization. Over the past two decades, metamaterials have been widely used in fields such as electromagnetic cloaks, perfect absorbers, negative refraction, and command launch.

[0025] An important embodiment of the present invention is a metasurface unit, the unit has multi-resonan...

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Abstract

The invention belongs to the technical field of communication and particularly is specifically a multi-resonant polarized insensitive reflective coded super surface for reducing a radar cross section(RCS). The super surface unit has rotational symmetry and can produce the same x-polarized and y-polarized electromagnetic scattering responses. In order to achieve the 4-bit phase response, the sizeof the super surface unit is optimized, phase difference among the units is 22.5 DEG, the broadband (15-40GHz) has reflection amplitude exceeding 0.9, and phases of 16 coding states are theta, theta+22.5DEG, theta+45DEG, theta+67.5DEG, theta+90DEG, theta+112.5DEG, theta+135DEG. theta+157.5DEG, theta+180DEG, theta+202.5DEG, theta+225DEG, theta+247.5DEG, theta+270DEG, theta+292.5DEG, theta+315DEG, theta+337.5DEG. A discrete water cycle algorithm is applied to design of an array unit to obtain an optimal code sequence matrix, and better RCS reduction is achieved. The super surface is advantaged in that the RCS of the coded super surface and the same-size copper plate are separately measured for comparison, the measurement result shows that the RCS is reduced by 10 dB at 20-40 GHz, at 15-20 GHz, the RCS is reduced by 7.8 dB.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a reflective coding metasurface for broadband RCS reduction and having multi-resonance polarization insensitive units. Background technique [0002] With the rapid development of defense electronics, the demand for stealth technology has increased dramatically in recent years. The radar cross section (RCS) of a flying object is an important factor in evaluating its visibility to radar. Therefore, stealth aircraft should have low RCS characteristics to reduce the probability of being detected by radar. [0003] Conventional stealth technology is based on coating and changing the shape of objects with radar absorbing materials (RAMs). However, the radar absorbing material increases the weight and thickness of the object, and the shape stealth technology increases the complexity of the design and affects the aerodynamic layout. The inverse cancellation method ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00
CPCH01Q15/0086
Inventor 亚瑟莎芙菈杨国敏徐丰张福恒陈沁卓
Owner FUDAN UNIV
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