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High-Performance Broadband Microwave Absorbers Using Multilayer Dual-Phase Dielectric Composites

  • Utpal Jyoti Mahanta
  • Munu Borah
  • Nidhi Saxena Bhattacharyya
  • Jyoti Prasad GogoiEmail author
Article

Abstract

In search of high-performance broadband microwave absorption, the design of double-layer dielectric microwave absorbers based on dual-phase polyaniline (PA)/expanded graphite (EG) composites synthesized by in situ polymerization of aniline in different concentrations (0.00 wt.%, 0.15 wt.% and 0.25 wt.%) of EG was optimized. The developed composite reinforcers, viz. PA/EGx=0.15,0.25 and PA/EGx=0.00 (PA), were mixed at different loadings (10 wt.%, 20 wt.% and 30 wt.%) with novolac phenolic resin to form PG and PA composites, then their complex permittivity and permeability in the X-band were characterized. Using the transmission-line model, the reflection loss of single-layer absorbers of different PG and PA composites was estimated (RLc) and measured (RLm). Based on the best results, the design of the double-layer absorber was optimized by tuning the impedance matching between layers by adjusting the arrangement and thickness of the layers in the composites. Promising microwave absorption with RLm ∼ − 48 dB at 9.4 GHz along with − 20-dB and − 30-dB absorption bandwidths of 3 GHz and 2 GHz were obtained for the double-layer design comprising PG5–PA3 composite material layers. Moreover, a partially perforated double-layer design is proposed, showing enhanced absorption bandwidth due to frequency-independent impedance matching at the interface between air and the perforated layer, facilitated by the effective permittivity of the latter.

Keywords

Polyaniline expanded graphite dielectric response transmission line multilayer microwave absorber 

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Notes

Acknowledgments

The authors are sincerely grateful to the Department of Physics, Sibsagar College, India and Microwave Engineering Laboratory of Tezpur University India, for providing facilities to carry out the research work.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Utpal Jyoti Mahanta
    • 1
    • 4
  • Munu Borah
    • 2
  • Nidhi Saxena Bhattacharyya
    • 3
  • Jyoti Prasad Gogoi
    • 1
    Email author
  1. 1.Department of PhysicsKaziranga UniversityJorhatIndia
  2. 2.Department of PhysicsIndian Institute of Technology GuwahatiGuwahatiIndia
  3. 3.Department of PhysicsTezpur UniversityTezpurIndia
  4. 4.Department of PhysicsSibsagar CollegeSivasagarIndia

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