Memristor RIS Cell for Non-Volatile Beamforming Control
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Solution Overview
Problem
Conventional reconfigurable intelligent surfaces (RISs) for wireless communication face challenges with high static energy consumption due to the need for continuous power to maintain switch states, and RF MEMS devices face issues with high switching voltages and fabrication complexity, hindering the development of greener 6G technologies.
Innovation Solution
The use of memristors connected in series with conductive regions of antennas in RIS cells allows for low power consumption, non-volatile switching, and fast switching times, achieving reconfigurability without high switching voltages, and enabling multilevel resistance states for advanced control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional reconfigurable cells with PIN diodes, MEMS, liquid crystals, or varactor diodes are used, then reconfigurability is achieved, but static energy consumption is high due to continuous power spending to maintain switch states
Solution Approach 1:
The memristor device inherently maintains its resistance state without requiring external power, utilizing its own physical properties (resistive switching) to preserve configuration information, thereby eliminating the need for continuous power spending
Solution Approach 2:
The invention changes the fundamental operating parameter from volatile switching (requiring continuous power) to non-volatile resistive switching, where the memristor transitions between high and low resistance states to control antenna impedance without continuous power supply
2Use of energy by stationary object
If RF MEMS devices are used to achieve low power consumption, then static energy consumption is reduced, but switching voltages become high (10-100 V) and fabrication complexity increases
Solution Approach 1:
The memristor can be fabricated using standard semiconductor processing techniques that are already widely available, replacing the complex RF MEMS fabrication process with more accessible and simpler manufacturing methods
Solution Approach 2:
The invention replaces the mechanical moving parts of RF MEMS with a solid-state memristor device that achieves switching through electrical resistance changes, eliminating mechanical complexity and high voltage requirements
3Adaptability or versatility
If conventional reconfigurable cells are used, then reconfigurability is achieved, but switching time is slow and frequency operation is limited
Solution Approach 1:
The memristor enables rapid transitions between resistance states through periodic voltage pulses, achieving fast switching times in the microsecond range that support higher frequency operations compared to conventional cells
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces static energy consumption, enables fast switching times, and allows for reconfigurability at higher frequencies, supporting efficient beamforming and radiation control in RISs for 6G wireless communications.
Implementation Method 1
the memristor by being electrically connected in series with the respective conduction region of the antenna, it can allow for controlling the resistivity of the combination of the conduction of the region and the memristor, and hence, for controlling the electrical and magnetic properties of the antenna that comprises said conduction region
Data Source
Figure 1~2A
Figure 2B~3A
Figure 3B~4
AI summary
A cell for a transmit array or a reflect array, the cell comprising an antenna which is a patch antenna or a ring resonator antenna, and at least one memristor (13, 13a, 13b) which is electrically connected in series with a respective conductive region (11, 111, 211, 311, 411, 418, 840P, 840N) of the antenna. A transmit array or a reflect array comprising a plurality of cells. A system comprising the array and further comprising a digital controller and, connectable to the digital controller, a corresponding interface circuit for each cell of the plurality of cells, wherein the digital controller in combination with the corresponding interface circuit are configured to controllably set the at least one memristor (13, 13a, 13b) of each cell to any of a first resistivity state and a second resistivity state.