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Metamaterial-based zero-phase-shift-line loop antennas

Metamaterial-based zero-phase-shift-line loop antennas

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The metamaterial-based zero-phase-shift-line (ZPSL) structures have exhibited unique dispersion characteristic which enables the flowing current along it featuring very small phase lag. This chapter has outlined the ZSPL configurations, the dispersion characteristic analysis approaches based on electromagnetic simulation and circuit model, and the design guidelines. A number of ZPSL loop antenna designs have been exemplified for different applications. The relevant discussions are believed to benefit the antenna researchers, engineers, and students to further understand of the ZPSL structure and development new ZPSL-based antennas.

Chapter Contents:

  • 12.1 Introduction
  • 12.2 State-of-the-art ZPSL loop antennas
  • 12.3 Modeling of zero-phase-shift-line structure
  • 12.3.1 Dispersion analysis of zero-phase-shift-line structure
  • 12.3.1.1 Eigen-mode analysis
  • 12.3.1.2 Driven-mode analysis with loop configuration
  • 12.3.1.3 Equivalent circuit
  • 12.3.2 Design guidelines
  • 12.4 Design and applications
  • 12.4.1 Electrically large zero-phase-shift-line loop antennas for UHF near-field RFID readers
  • 12.4.1.1 Zero-phase-shift-line single-loop antenna
  • 12.4.1.2 Zero-phase-shift-line dual-loop antenna
  • 12.4.1.3 Zero-phase-shift-line grid-loop array antenna
  • 12.4.1.4 AMC-backed directional ZPSL loop antenna
  • 12.4.2 Horizontally polarized omnidirectional antenna for WLAN access points
  • 12.4.3 CP omnidirectional antenna for UHF far-field RFID readers
  • 12.5 Summary
  • References

Inspec keywords: loop antennas; metamaterial antennas

Other keywords: phase lag; metamaterial-based zero-phase-shift-line loop antennas; ZPSL structures; dispersion characteristic; circuit model; electromagnetic simulation; flowing current

Subjects: Single antennas

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