# Smart Surfaces That Bend Radio Waves > Samsung's patent describes a special surface made of tiny cells that can change how radio waves bounce off it, directing them precisely where needed. - **Patent:** US 11843171 - **Original title:** Multi-layer reconfigurable surface for an antenna - **Owner:** Samsung Electronics Co - **Granted:** 2023 - **Status:** Active - **Times cited:** 5 - **Field:** telecommunications, consumer_electronics, semiconductors, software ## What it does This patent describes a 'reconfigurable intelligent surface' (RIS) made of many small 'unit-cells'. Each unit-cell has a conductive top layer with a specific pattern, like an inverted L-shape, that reflects radio waves at a set angle. Crucially, there's a middle layer with material whose electrical properties can be changed, like its dielectric constant. By altering this middle layer, the surface can precisely control the phase, or timing, of the reflected waves. This allows the surface to steer radio signals, like those from a Wi-Fi router, to a specific receiver, improving signal strength and coverage. For example, a surface could be placed on a wall to redirect a weak Wi-Fi signal around an obstacle to your phone. ## What it does NOT cover - Surfaces that only reflect waves without changing the phase of reflection. - Surfaces that actively transmit or amplify radio waves instead of just reflecting them. - Surfaces where the dielectric properties of the middle layer cannot be tuned. - Reflective patterns that are not sub-wavelength (smaller than the wavelength of the radio wave). - Systems that do not use a conductive material for the first layer. ## The clever bit The innovation lies in using a tunable dielectric material in a middle layer to precisely control the phase of reflected waves across a surface composed of many such elements, enabling sophisticated beamforming without active antennas. ## Real-world examples 1. Smart building surfaces for improved cellular coverage 2. Wireless backhaul signal boosters 3. Future Wi-Fi extenders 4. Metasurfaces for directed wireless communication ## Why it matters This technology is key for future wireless communication, especially in dense urban environments or inside buildings where signals can be weak or blocked. By intelligently redirecting signals, these surfaces can boost network capacity and reliability for technologies like 5G and beyond, and potentially for Wi-Fi in homes and offices. ## Frequently asked questions ### What does Smart Surfaces That Bend Radio Waves cover? Samsung's patent describes a special surface made of tiny cells that can change how radio waves bounce off it, directing them precisely where needed. ### Who owns patent US 11843171? Samsung Electronics Co owns this patent, granted in 2023. ### When does this patent expire? This patent is expected to expire on July 23, 2041, when the invention enters the public domain. ### What is patent US 11843171 cited by? This patent has been cited by 5 later patents that build on its ideas. ### What problem does this patent solve? This technology is key for future wireless communication, especially in dense urban environments or inside buildings where signals can be weak or blocked. By intelligently redirecting signals, these surfaces can boost network capacity and reliability for technologies like 5G and beyond, and potentially for Wi-Fi in homes and offices. ### What does this patent NOT cover? Surfaces that only reflect waves without changing the phase of reflection. **Full plain-English explainer:** https://patentbrief.org/patent/us/11843171/multi-layer-reconfigurable-surface-for-an-antenna **Original patent:** https://patents.google.com/patent/US11843171 --- _Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._ ## Related patents Semantically similar inventions in the PatentBrief corpus: - [How Wireless Radios Automatically Adjust to Avoid Signal Overload](https://patentbrief.org/patent/us/12255678/falcon-1) — A method for wireless devices to automatically rearrange their internal signal-processing components when incoming radio signals are too strong and threaten to overwhelm the hardware. - [How Intel's Transceiver Chip Manages Wireless Signals](https://patentbrief.org/patent/us/11955732/wireless-communication-technology-apparatuses-and-methods) — Intel's 2024 patent describes a transceiver chip with patch antennas on one side and an RFIC with a protective shield on the other, designed to improve wireless communication by managing interference. - [How Phones and Base Stations Talk Using Twisting Radio Waves](https://patentbrief.org/patent/us/11974263/method-of-using-orbital-angular-momentum-in-a-wireless-communication-system-and-) — LG's patent describes a method for a mobile device to tell a base station which specific "twisting" radio wave patterns it can best receive, helping improve wireless communication. - [A Digital Antenna System for Steering Radio Signals](https://patentbrief.org/patent/us/12738651/system-and-method-for-a-digitally-beamformed-phased-array-feed-12738651) — This patent describes a digital antenna system that uses multiple small antennas and digital processing to precisely aim radio signals across different frequency bands, while also managing power and heat. - [How 5G Networks Intelligently Switch Your Phone's Connection Beams](https://patentbrief.org/patent/us/12231284/network-architecture-methods-and-devices-for-a-wireless-communications-network) — This patent describes how a 5G network efficiently manages and switches the directional radio signals (beams) your phone uses, especially when needing to look beyond its current cell tower.