Researchers at MIT have invented a reconfigurable antenna, dubbed a 'meta-antenna,' that can dynamically change its frequency range by altering its shape. Made from auxetic metamaterials, the antenna's resonance frequency shifts based on its deformation, allowing for versatility in wireless communication applications.
MIT researchers have developed an antenna that can adjust its frequency range by physically changing its shape.This newly designed reconfigurable antenna device has been dubbed “meta-antenna.” Instead of standard, rigid metal, this antenna is made from metamaterials — special engineered materials whose properties are based on their geometric structure.
It could be suitable for applications like transferring energy to wearable devices, tracking motion for augmented reality, and enabling wireless communication. “The beauty of metamaterials is that, because it is an interconnected system of linkages, the geometric structure allows us to reduce the complexity of a mechanical system,” said Marwa AlAlawi, a lead author and mechanical engineering graduate student at MIT, in a press release published on Monday. A prototype smart headphone shifts the resonance frequency by 2.6 percent when the meta-antenna expands and bends. MITDurable antenna constructionTypically, antennas are static, unchanging metal rods used for sending and receiving radio signals.MIT researchers are rethinking what an antenna can be, transforming it from a rigid piece of hardware into a flexible device for many different uses.In recent years, metamaterial antennas have already moved past the theoretical stage to solve real-world problems, particularly in areas like 5G, satellite communication, and biomedical sensing.The new antenna is made from auxetic metamaterials, which means its properties can be changed simply by deforming its shape.These next-gen materials can be programmed to change shape by rotating, compressing, stretching, or bending their repeating internal structures, or “unit cells.”Changing the antenna‘s shape alters its resonance frequency—where it works best—allowing one device to handle many different wireless protocols.“In order to trigger changes in resonance frequency, we either need to change the antenna’s effective length or introduce slits and holes into it. Metamaterials allow us to get those different states from only one structure,” added AlAlawi.In terms of its construction, the meta-antenna is built with a non-conductive, or dielectric, layer sandwiched between two conductive layers. It was created by laser-cutting a dielectric layer from a rubber sheet, which was then topped with a conductive spray-painted patch to form a resonating “patch antenna.”During fabrication, the researchers found that materials couldn’t withstand the constant bending and stretching. They solved this problem by applying a coat of flexible acrylic paint, which protects the structure and prevents it from breaking.The experiments also demonstrated the antenna’s durability, showing it could withstand over 10,000 compressions.A new form of sensingThe team made an interesting discovery: the antenna‘s changes in radio frequency can also be used as a new sensing method.The meta-antenna can detect physical changes in its environment by capturing shifts in the resonance frequency. For example, it could monitor a person’s breathing by detecting the expansion and contraction of their chest.Interestingly, the sensing capability was demonstrated using several prototypes, including a “smart curtain” that adjusts lighting, and a headset that changes between noise-cancelling and transparent modes by deforming.Moreover, a meta-antenna built into smart headphones can shift its resonance frequency by 2.6% when it bends, enough to change the headphone’s mode. This means a single device could operate on various wireless protocols, eliminating the need for multiple antennas.To make the technology accessible to other creators, the team also developed an editing tool. The tool allows users to design customized metamaterial antennas by defining key parameters and then simulating the antenna’s performance before fabricating it with a laser cutter.For the future, the plans are to create three-dimensional meta-antennas for an even wider range of applications, add more features to their design tool, and further improve the durability of the metamaterial structure.
Metamaterials Antenna Wireless Communication Shape-Shifting Sensing
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