Research On The Application Of Metasurface Devices Integrated With Cloaking And Illusion Functions

The application of cloaking and illusion technology will significantly improve the combat effectiveness and battlefield survivability of ships and other weapons and equipment,and become an important factor affecting the success or failure of military operations.As a new artificial sub-wavelength structure,metasurface provides a new way for the realization of cloaking and illusion devices with its excellent wave manipulation ability,ultra-thin thickness and simple design method.However,most of the existing cloaking and illusion metasurface devices have a single function,a narrow working frequency band,and can only adapt to a single physical field,which is difficult to meet the development requirements of today’s functional device integration and intelligence.In response to the above problems,this thesis has carried out the following work around the application research of the integrated metasurface device with cloaking and illusion functions:Firstly,a design method for the integrated metasurface device of electromagnetic cloaking and illusion functions composed of anisotropic units with phase-independent characteristics was proposed,and the function integrated metasurface device was fabricated by 3D printing technology.Under the incident condition of E_y polarized electromagnetic wave,the metasurface device can establish a virtual target with arched shape.The measured maximum reduction of the generalized RCS is-6.38 dB,and the metasurface device has excellent illusion performance.Under the incident condition of E_x polarized electromagnetic wave,the metasurface device can establish a triangular cloaking area.The measured maximum reduction of the generalized RCS is-6.85 dB,and the metasurface device shows excellent cloaking performance.This kind of anisotropic electromagnetic cloaking and illusion function integrated metasurface device designed by microstructure characteristics provides a reference method for the integrated design of metasurface function devices.Secondly,a dynamic metasurface device with convertible electromagnetic cloaking and illusion functions was fabricated based on the fused deposition 4D printing process.Under the stimulation of temperature,dynamic cloaking and illusion functions are realized by controlling the structural and shape changes of the metasurface device.When the metasurface device is a flat-plate structure,a"V"-shaped groove illusion target can be established.The measured maximum reduction of the generalized RCS is-6.10 dB,and the metasurface device exhibits excellent illusion performance.When the metasurface device changes to a triangular structure,a triangular cloaking area can be established.The measured maximum reduction of the generalized RCS is-5.12 dB,and the metasurface device has achieved excellent cloaking performance.The metasurface device fabricated by the 4D printing process realizes the dynamic conversion of its electromagnetic cloaking and illusion functions,provides a new idea for the realization of integrated metasurface devices with electromagnetic cloaking and illusion functions.Finally,the electromagnetic and acoustic dual physical field broadband illusion metasurface device was designed and fabricated.With the reflection characteristics of the groove unit,the metasurface device is endowed with the same illusion function in the electromagnetic and acoustic dual physical field environment.The maximum generalized RCS is reduced to-23.82dB under electromagnetic wave incident conditions,and the generalized RCS reduction is less than-3 dB in the three frequency ranges of 2.21-6.55 GHz,7.43-10.21 GHz and 12.28-13.85GHz.The metasurface device shows certain broadband characteristics.Under the condition of acoustic wave incidence,the metasurface device exhibits excellent illusion performance at frequencies of 3500 Hz,4000 Hz,4500 Hz and 5154 Hz.This kind of electromagnetic and acoustic dual physical field wideband illusion metasurface device composed of groove units has opened a new way for the realization of cloaking and illusion devices with multi-physical field functions.