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Area of Science:

  • Electrical Engineering
  • Aerospace Communications
  • Antenna Theory

Background:

  • Satellite mega-constellations are emerging as a solution for global broadband internet access.
  • Reflectarray antennas offer a low-cost, low-profile alternative for satellite antenna subsystems.
  • Achieving a constant power flux density (isoflux pattern) is essential for uniform service coverage.

Purpose of the Study:

  • To design and optimize a reflectarray antenna for satellite mega-constellations.
  • To achieve a shaped-beam isoflux pattern for constant power flux density across the Earth's surface.
  • To validate the antenna's performance over a 2 GHz bandwidth in the Ku-band.

Main Methods:

  • A reflectarray unit cell using two stacked rectangular microstrip patches with a ground plane was designed.
  • The generalized intersection approach optimization algorithm was employed for pattern synthesis.
  • Full-wave electromagnetic analysis was used for wideband design and performance validation.

Main Results:

  • The designed reflectarray achieved the specified isoflux pattern.
  • The antenna demonstrated compliance with the isoflux specifications within the 16 GHz-18 GHz frequency band.
  • The design provides over 360° of phase-shift, enabling complex beam shaping.

Conclusions:

  • The developed reflectarray antenna is a viable low-cost, low-profile solution for mega-constellation satellite user beams.
  • This technology supports the provision of shaped beams for enhanced global broadband coverage.
  • The design showcases the potential of reflectarrays for future communication satellite applications.