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Ionic Conductive Gels for Optically Manipulatable Microwave Stealth Structures.

Wei-Li Song1,2, Ya-Jing Zhang1,2,3, Kai-Lun Zhang1,2,3

  • 1Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 30, 2020
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Summary

New transparent gels absorb microwaves by manipulating polar networks. These gels switch from transparent to opaque when cooled, enabling tunable microwave stealth for 5th generation (5G) applications.

Keywords:
dielectric materialsgelsoptical structuressmart windowstransparent microwave absorbers

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Polymer Science

Background:

  • Smart structures require tunable properties for advanced applications.
  • Transparent materials that block microwaves are crucial for 5G technology.
  • Existing solutions face challenges in balancing optical transparency and microwave absorption.

Purpose of the Study:

  • To develop novel polymeric aqueous gels with both optical transparency and microwave absorbing capabilities.
  • To investigate the manipulation of hydrogen bonding networks for controlling microwave absorption.
  • To demonstrate a temperature-switchable transition between optically transparent and opaque states.

Main Methods:

  • Fabrication of polymeric aqueous gels.
  • Characterization of optical transparency and microwave absorption properties.
  • Investigation of temperature-induced phase transitions (amorphous to polycrystal).
  • Evaluation of microwave absorption in the 15-40 GHz range for 5G bands.

Main Results:

  • Optically transparent gels demonstrated effective microwave absorption.
  • Manipulation of polar networks within the gels was key to attenuating electromagnetic energy.
  • Gels exhibited a reversible switchable state from transparent to opaque upon cooling.
  • Assembled sandwich windows using these gels showed effective microwave absorption across 5G frequencies.

Conclusions:

  • Polymeric aqueous gels offer a new strategy for creating manipulatable microwave absorbing structures.
  • The ability to tune properties via temperature offers a pathway to switchable stealth applications.
  • These ionic conductive gels are promising for advanced electromagnetic shielding and stealth technologies.