Reconfigurable leaky-wave antennas

Reconfigurable leaky-wave antennas

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In this chapter, an overview of the recent development of reconfigurable high-gain antennas is presented. These antennas range from reconfigurable Yagi antennas, reconfigurable reflectarrays and reconfigurable transmitarrays to reconfigurable PRS antennas. It is demonstrated that PRS antennas are able to reconfigure their frequency, polarization and radiation patterns with high realized gains. Compared with RA arrays, reconfigurable reflectarrays and transmitarrays, it is much easier for reconfigurable PRS antennas to achieve various reconfigurations with a simpler biasing network. In order to fully exploit the diversities of antennas in wireless communication and radar systems, compound reconfigurations of two or three antenna parameters are highly desired. However, there have been no reported products employing such combined RAs. Since PRS antennas have more freedom of parameters (a single feeding source/feeding source arrays and a PRS structure), the above challenge could be addressed by allocating different reconfigurations to different parts. As this work progresses, there is no doubt that fully reconfigurable PRS antennas will deliver significant benefits to practical wireless systems in future.

Chapter Contents:

  • 5.1 Introduction
  • 5.2 History of LWAs
  • 5.2.1 Basic operating principle
  • 5.2.2 Classification of LWAs
  • One-dimensional uniform LWA
  • One-dimensional quasi-uniform LWA
  • Two-dimensional LWA
  • 5.3 Passive frequency-scanning LWA structures
  • 5.3.1 One-dimensional (1-D) Fabry–Pérot LWA
  • 5.3.2 Composite right/left-handed transmission line and LWA
  • 5.3.3 Half-width microstrip LWA
  • 5.4 Reconfigurable LWAs
  • 5.4.1 1-D FP-reconfigurable LWAs
  • Analysis on the reconfigurable FP LWA
  • Antenna prototype and measured results
  • 5.4.2 Two-dimensional (2-D) FP-reconfigurable LWA
  • Antenna configuration
  • Dispersion and antenna analysis
  • 5.5 Experimental results
  • 5.5.1 CRLH-based reconfigurable LWA
  • Reconfigurable CRLH LWA for fixed-frequency beam scanning
  • CRLH LWA with tunable beamwidth and radiation angle
  • 5.5.2 Reconfigurable half-width microstrip LWA
  • Analysis of 1-D reconfigurable structure using multistate macrocell
  • Antenna design using binary unit cells
  • Analysis of the LWA using macrocell states
  • Comparison of reconfigurable LWA with uniform LWA
  • Measured results
  • 5.6 Conclusion
  • References

Inspec keywords: antenna feeds; Yagi antenna arrays; reflectarray antennas; directive antennas; leaky wave antennas; transmitting antennas

Other keywords: reconfigurable leaky-wave antennas; reconfigurable high-gain antennas; freedom of parameters; radiation patterns; reconfigurable transmitarrays; feeding source arrays; three antenna parameters; RA arrays; practical wireless systems; reconfigurable reflectarrays; reconfigurable Yagi antennas; compound reconfigurations; single feeding source; wireless communication; radar systems; reconfigurable PRS antennas

Subjects: Single antennas; Antenna arrays; Antenna accessories

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