Transmitarray Antenna Design for High-Frequency Applications

Summary

Transmitarray antennas combine the high directivity of reflector systems with the low profile and planar form factor of phased arrays, making them a compelling solution for high-frequency communications and sensing. By assembling an array of subwavelength unit cells—each engineered to impart a specific transmission‐phase shift—these antennas can tailor the wavefront of an incident feed source into a highly collimated beam. Design strategies focus on maximising bandwidth, reducing profile, and maintaining high aperture efficiency across millimetre‐wave and Ka-band frequencies. Advanced unit‐cell configurations employ multilayer frequency‐selective surfaces, Huygens’ metasurfaces and resonant dipole structures to achieve full 360° phase coverage with minimal insertion loss. Phase‐compensation schemes and optimisation algorithms are integral to mitigating phase errors and enhancing gain and sidelobe performance. Recent trends include particle-swarm and genetic‐algorithm optimisation, multimode feeding techniques and modular manufacturing approaches such as 3D-printing. These developments have broadened the applicability of transmitarrays to satellite links, 5G and beyond, wireless backhaul and radar systems, offering a scalable, low-cost pathway to high-gain, beam-steerable apertures without the complexity of active phase-shifter networks.

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Transmitarray Antenna Design for High-Frequency Applications publication trend

The graph below shows the total number of articles in transmitarray antenna design for high-frequency applications across all publications each year (not limited to Nature Index journals).

Technical terms

Transmitarray Antenna: A planar antenna composed of discrete unit cells that adjust the transmission phase to form a desired far-field pattern.

Metasurface: A two-dimensional arrangement of subwavelength scattering elements engineered to control electromagnetic wavefronts.

Phase Shift: The change in phase angle introduced by a unit cell to the transmitted wave in order to steer or shape the beam.

Beam Steering: The electronic or passive adjustment of the main lobe direction of an antenna without mechanical movement.

Aperture Efficiency: The ratio of the effective radiating area of an antenna to its physical aperture area, indicating utilisation of the aperture.

References

  1. Dual-Band Passive Beam Steering Antenna Technologies for Satellite Communication and Modern Wireless Systems: A Review. Sensors (2024).
  2. Wideband Transmitarray With Reduced Profile. IEEE Antennas and Wireless Propagation Letters (2018).
  3. Bi-layer metasurface based on Huygens' principle for high gain antenna applications.. Optics Express (2020).
  4. Low-Profile High-Gain and Wide-Angle Beam Scanning Phased Transmitarray Antennas. IEEE Access (2020).
  5. Wideband Low-Profile Ku-Band Transmitarray Antenna. IEEE Access (2020).
  6. A High-Performance Transmitarray Antenna with Thin Metasurface for 5G Communication Based on PSO (Particle Swarm Optimization). Sensors (2020).
  7. Beam Scanning Capabilities of a 3D-Printed Perforated Dielectric Transmitarray. Electronics (2019).

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