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Meta-atoms and artificially engineered materials for antenna applications

Meta-atoms and artificially engineered materials for antenna applications

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In this article chapter, we discuss different ways to mitigate some of the problems encountered with MTMs, and present strategies for artificially synthesizing dielectric materials that are broadband as well as low-loss; hence, they are useful for real-world antenna applications involving low-profile flat lenses and reflectarrays, for example. The key to circumventing the difficulties with MTM, which we have identified above, is to steer clear of the common practice of using resonant inclusions or “particles”to achieve extreme material properties, negative index; and, zero index. Our strategy is to develop antenna designs that only call for material parameters that are realistic, so that they can either be acquired off-the-shelf, or by slightly tweaking the available materials by embedding small patches or apertures, often referred to as “particles”, whose dimensions are far removed from the resonance range. This obviates the problems of dispersion, narrow bandwidths and losses that plague the MTMs, at least those that fall in the “exotic”category, for example, the doublenegative or DNG type. Although the RO approach leads to dielectric-only designs that do not need to use magnetic materials, these designs still typically require dielectric materials that may not be available off-the-shelf.

Chapter Contents:

  • 10.1 Introduction
  • 10.2 Lens designs using MTMs
  • 10.3 Lens design using RO
  • 10.4 3D-Printing technique
  • 10.5 Design of artificially engineered materials
  • 10.5.1 Designing higher-permittivity materials from low-permittivity COTS material: method-1
  • 10.5.2 Designing higher-permittivity materials from low-permittivity COTS material: method-2
  • 10.5.3 Designing lower-permittivity materials from high-permittivity COTS material
  • 10.5.4 Designing lower-permittivity materials from high-permittivity 3D-printing material
  • 10.6 Different lens designs
  • 10.6.1 PLA Lens design
  • 10.6.1.1 Lens fabrication
  • 10.6.1.2 Lens measurement
  • 10.6.1.3 Results
  • 10.6.2 DaD lens design
  • 10.6.2.1 Lens fabrication
  • 10.6.2.2 Results
  • 10.6.3 ABS lens design
  • 10.6.3.1 Results
  • 10.6.4 Comparison of DaD and ABS lenses
  • 10.7 Summary
  • 10.8 Metal-only reflectarray antenna designs using metasurfaces
  • 10.9 Performance enhancement of antenna and array antennas using metasurface superstrates
  • 10.9.1 Example-1
  • 10.9.2 Example-2
  • 10.9.3 Summary
  • References

Inspec keywords: magnetic materials; reflectarray antennas; dielectric materials; broadband antennas; metamaterial antennas

Other keywords: MTM; reflect-arrays; material parameters; artificially engineered materials; real-world antenna applications; RO approach; artificially synthesizing dielectric materials; DNG type; magnetic materials; low-profile flat lenses; antenna designs

Subjects: Antenna arrays; Single antennas

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