Researchers are developing a floating antenna design to relieve congestion in the electromagnetic frequency spectrum and strengthen wireless signals.
At the ElectroScience Laboratory (ESL) at Ohio State University, the team is creating suspended high-gain millimeter-wave antenna arrays using a combination of 3D printing and MEMS (Micro-Electro-Mechanical Systems) technologies. Their approach isolates the radiating elements from conventional solid substrates to reduce signal loss and improve performance.
Addressing spectrum overcrowding and 5G demands
Spectrum overcrowding is expected to intensify as 5G expands and more devices require higher bandwidth. Lower-frequency bands, already congested, will face greater pressure, while higher frequencies such as millimeter waves are more vulnerable to interference and signal degradation. The ESL team’s suspended antenna concept aims to mitigate these challenges by improving radiation efficiency and reducing substrate-related losses.
Floating antennas and improved radiation efficiency
Traditional antennas are often mounted directly on silicon or other substrates that can absorb or scatter energy, diminishing efficiency. By physically isolating the antenna elements—effectively making them hover above the substrate—the researchers aim to achieve radiation efficiencies above 85 percent. This elevated configuration reduces interactions with lossy materials and preserves signal strength.
Lens structures and focused beams
In addition to levitated elements, the project incorporates novel lens structures designed to focus and amplify the energy emitted by the array. These lenses concentrate emitted power into tighter beams, increasing effective range and signal quality while minimizing unwanted interference. The combination of suspended radiators and beam-shaping optics is intended to deliver stronger, cleaner millimeter-wave links.
Applications beyond mobile networks
While motivated by 5G and the need to expand wireless capacity, the suspended-antenna approach has broader potential. It could improve fixed wireless access deployments, enabling gigabit internet service to homes and businesses without the time and expense of laying fiber across difficult terrain. The design could also enhance radar systems, medical imaging equipment, and other technologies that rely on efficient, high-frequency antennas.
Research funding and next steps
The team received a three-year, $300,000 grant from the National Science Foundation (NSF) to advance the research. Although there is no guarantee the concept will be commercialized, early results suggest it could offer a significantly more efficient solution for high-frequency wireless systems. Continued development will investigate manufacturing approaches, integration with existing infrastructures, and real-world performance testing to evaluate feasibility and potential deployment scenarios.
By addressing substrate losses and improving beam control, the floating antenna arrays aim to play a role in meeting future wireless capacity needs. If successful, they could help deliver faster, more reliable connections for both mobile and fixed services while opening opportunities in sensing and imaging applications that benefit from higher radiation efficiency.