High-Gain Antenna Design and Metamaterials

High-gain antennas are essential for long-range communication, radar and emerging wireless standards. The integration of metamaterials and metasurfaces has revolutionised this field by providing unprecedented control over electromagnetic wavefronts. Metamaterials, composed of subwavelength unit cells, offer tailored effective permittivity and permeability, enabling novel phase and amplitude manipulations. Metasurfaces, their two-dimensional counterparts, impose spatially varying phase gradients to shape radiation patterns, enhance directivity and suppress sidelobes. Fabry–Pérot resonant cavities augmented with partially reflective metasurfaces combine resonance and phase engineering to achieve wideband, high-gain performance in compact form factors. Recent advances have demonstrated all-metal structures that avoid lossy dielectrics, near-zero refractive‐index layers for bandwidth enhancement and polarisation-converting superstrates for multifunctional operation. These developments have direct applications in 6G communications, sub-terahertz links, satellite payloads and beam-steering systems, while additive manufacturing and microfabrication techniques ensure cost-effective production. Ongoing research focuses on broadband performance, low cross-polarisation, dynamic beam steering and integration with active components for reconfigurability.

Research from Nature Portfolio

Recent studies have introduced an all-metal wideband phase‐correcting metasurface that addresses the limitations of dielectric‐based designs. By extracting near-field phase errors of a complex horn source, this structure realises broadband phase correction and enhances aperture distribution across a 25 percent fractional bandwidth. Fabricated using precision machining, it achieves significant gain improvement without substrate losses and is readily adapted to diverse antenna types. Another breakthrough involves a fully metallic Fabry–Pérot cavity antenna operating at 300 GHz. Fabricated by laser‐cut brass, it comprises seven metallic layers including a frequency‐selective superstrate that functions as a partially reflective surface. This prototype delivers over 14 dBi across a 7 percent bandwidth, exhibits cross-polarisation below −25 dB and maintains a compact footprint, offering a viable route to low-cost, high-gain sub-terahertz antennas for next-generation wireless networks.

High-Gain Antenna Design and Metamaterials publication trend

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

Technical terms

Metamaterial: Engineered composite structure with subwavelength features designed to produce electromagnetic properties not found in natural materials, such as tailored permittivity or permeability.

Metasurface: Two-dimensional metamaterial composed of an array of engineered unit cells that impose spatially varying phase, amplitude or polarisation modulation on incident waves.

Fabry–Pérot resonant cavity: A configuration formed by two parallel reflecting surfaces that trap electromagnetic fields to enhance directivity and bandwidth through multiple reflections and phase resonance.

High-impedance surface: Specially designed metasurface presenting a high surface impedance to incident waves, enabling low-loss reflection and tunable phase for beam steering.

References

1. All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources. Scientific Reports (2021).
2. A 300-GHz low-cost high-gain fully metallic Fabry–Perot cavity antenna for 6G terahertz wireless communications. Scientific Reports (2021).
3. Wideband Polarization Independent Resonant Cavity Antenna for 6G Applications. IEEE Access (2023).
4. Continuous Beam-Steering Low-Loss Millimeter-Wave Antenna Based on a Piezo-Electrically Actuated Metasurface. IEEE Transactions on Antennas and Propagation (2021).
5. Enhanced Bandwidth of High Directive Emission Fabry-Perot Resonator Antenna with Tapered Near-Zero Effective Index Using Metasurface. Scientific Reports (2017).