Reconfigurable Transmitarray Antenna Technologies
Summary
Reconfigurable transmitarray antennas combine planar lens structures with electronically tunable unit cells to steer, shape and polarise microwave and millimetre-wave beams. Unlike conventional phased arrays that rely on complex feeding networks, transmitarrays employ a receive-transmit element for each cell, adjusting its transmission phase or amplitude via embedded active components. This architecture delivers low profile, high aperture efficiency and wide bandwidth, making it well suited to applications in 5G/6G links, satellite communications and radar systems. Recent advances harness novel materials, such as liquid crystals and phase-change alloys, or exploit metamaterial geometries to achieve multi-bit tuning, continuous phase control and low insertion loss. Ongoing research addresses challenges in biasing network design, miniaturisation at D-band and integration of polarisation-conversion functions to support dual-beam and multifunctional payloads.
Research from Nature Portfolio
Recent work has introduced a binary programmable transmitarray operating in the D-band (110–170 GHz) employing phase change materials within each unit cell. Two compact switches based on amorphous-to-crystalline transitions yield a 1-bit phase resolution and maintain insertion loss below 1.5 dB over a 27 % fractional bandwidth. A 10×10 element prototype, validated by full-wave simulation, demonstrates effective beam steering and retains high gain even after integrating individual DC bias lines. This study overcomes D-band miniaturisation hurdles and sets a new benchmark for compact, switch-based reconfigurable transmitarrays in the sub-THz regime.
Reconfigurable Transmitarray Antenna Technologies publication trend
The graph below shows the total number of articles in reconfigurable transmitarray antenna technologies across all publications each year (not limited to Nature Index journals).
Technical terms
Transmitarray: A planar antenna comprising a receive-transmit element grid that imposes a desired phase profile on an incident wave to form and steer a beam.
Unit cell: The elementary receive-transmit structure in a transmitarray whose transmission phase or amplitude can be individually controlled.
Phase shift: The change in phase imparted by a unit cell to an electromagnetic wave, used to direct the radiated beam.
Phase-change material: A substance that reversibly alters its electromagnetic properties (e.g., permittivity) when switching between amorphous and crystalline states.
Metamaterial: An engineered composite whose sub-wavelength features yield tailored electromagnetic responses not found in natural media.
PIN diode: A semiconductor switch used in microwave circuits to modulate amplitude or phase by varying its bias-dependent impedance.
References
- Hybrid Fishnet Metamaterial Based on Liquid Crystal and P-I-N Diodes for Reconfigurable Transmitarrays at $10 \,\mathrm{GHz}$. IEEE Journal of Microwaves (2024).
- Design of a binary programmable transmitarray based on phase change material for beam steering applications in D-band. Scientific Reports (2024).
- Recent Developments and Challenges on Beam Steering Characteristics of Reconfigurable Transmitarray Antennas. Electronics (2022).
- Digitally Reconfigurable Transmitarray With Beam-Steering and Polarization Switching Capabilities. IEEE Access (2021).
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