Remote controlled reconfigurable intelligent surface
The technology described herein is directed towards remotely controlling the direction of a beam reflected from a reconfigurable intelligent surface arranged with a two-dimensional array of unit cells. By controlling a variable tuning device (e.g., varactor diodes) per unit cell, a microcontroller can distinctively adjust the phase of each unit cell, which can be the same phase per column of elements. In one implementation, the reconfigurable intelligent surface is reconfigured to change its beam reflection direction upon receiving a remote control signal (e.g., a five-bit digital code through infrared). The code can be mapped to predefined phase profile data of a group of phase profile data options, that is, to a set of varactor voltages selected from available varactor voltage configurations, which is then applied to the varactors. In this way, the reflected beam can be controlled to reflect an electromagnetic wave (e.g., mmWave) in a specified direction.
1 . A system, comprising:
at least one controller; and
at least one memory that stores executable instructions that, when executed by the at least one controller, facilitate performance of operations, the operations comprising:
receiving signal data directed towards a reconfigurable intelligent surface, the reconfigurable intelligent surface comprising respective elements including respective variable tuning devices;
determining, based on the signal data, a specified beam reflection direction; and
controlling, based on the specified beam reflection direction, the respective variable tuning devices to determine respective phase shifts of the respective elements to reflect an electromagnetic wave impinging on the reconfigurable intelligent surface at the specified beam reflection direction.
2 . The system of claim 1 , wherein the respective variable tuning devices comprise respective tunable capacitors that are adjustable and usable to control the respective phase shifts of the respective elements.
3 . The system of claim 1 , wherein the respective variable tuning devices comprise respective varactors that are voltage-adjustable and usable to control the respective phase shifts of the respective elements of the respective active modules.
4 . The system of claim 1 , wherein the at least one memory maintains phase profile data usable to set the respective phase shifts, the phase profile data representing different selectable configurations of the reconfigurable intelligent surface that correspond to different beam reflection directions.
5 . The system of claim 4 , wherein the at least one memory is incorporated into the at least one controller.
6 . The system of claim 1 , wherein the different selectable configurations comprise different groups of respective voltages to apply to the respective variable tuning devices of the respective elements.
7 . The system of claim 1 , wherein the respective elements are arranged in rows and columns, wherein the columns are arranged as respective groups of columns, and wherein the controlling of the respective variable tuning devices comprises applying respective voltages to the respective variable tuning devices of the respective groups of columns.
8 . The system of claim 1 , wherein the reconfigurable intelligent surface is coupled to a signal sensor that receives the signal data.
9 . The system of claim 8 , wherein the signal data is encoded into an infrared signal, and wherein the signal sensor comprises an infrared sensor.
10 . The system of claim 8 , wherein the signal data is encoded into at least one of: a BLUETOOTH signal code, a radio frequency code, or a wired code.
11 . The system of claim 1 , wherein the signal data comprises a bit pattern that represents the specified beam reflection direction.
12 . The system of claim 11 , wherein the at least one memory maintains respective different voltage configurations of the reconfigurable intelligent surface that correspond to respective different beam reflection directions, and wherein the bit pattern represents one of the respective different voltage configurations.
13 . The system of claim 1 , wherein the respective elements are arranged as respective square arrays on the reconfigurable intelligent surface.
14 . A method, comprising:
obtaining, by a system comprising at least one controller coupled to a reconfigurable surface of respective elements that reflects an impinging electromagnetic wave, control signal data corresponding to a specified beam reflection direction of the reconfigurable surface; and
controlling, by the system based on the control signal data, respective variable tuning devices of the respective elements to determine respective phase shifts of the respective elements, to reflect the electromagnetic wave as a reflected electromagnetic wave at the specified beam reflection direction.
15 . The method of claim 14 , wherein the control signal data represents a defined bit pattern of a group of defined bit patterns, and further comprising selecting, by the system based on the defined bit pattern, respective values corresponding to the respective phase shifts.
16 . The method of claim 14 , further comprising selecting, by the system based on the control signal data, respective voltages corresponding to the respective phase shifts, wherein the controlling of the respective variable tuning devices comprises applying the respective voltages to the respective tunable variable devices.
17 . The method of claim 14 , wherein the respective elements are arranged as an array of respective rows and respective columns, and further comprising selecting, by the system based on the control signal data, respective subgroups of voltages corresponding to the respective phase shifts, wherein the controlling of the respective variable tuning devices comprises applying the respective subgroups of the respective voltages to the respective variable tuning devices in the respective columns.
18 . A non-transitory machine-readable medium, comprising executable instructions that, when executed by at least one processor, facilitate performance of operations, the operations comprising:
maintaining respective configurations of voltage values corresponding to respective phase shifts of respective elements of a reconfigurable intelligent surface;
obtaining signal code data;
determining, based on the signal code data, a selected configuration of voltage values from the respective configurations of voltage values; and
configuring the reconfigurable intelligent surface based on the selected configuration of voltage values, the configuring comprising applying voltages from the selected configuration of voltage values to respective varactors of the respective elements to determine the respective phase shifts of the respective elements, to combine respective radiation energy, reflected by the respective elements from an electromagnetic wave impinging on the reconfigurable intelligent surface, into a reflected beam having a beam direction determined by the respective phase shifts.
19 . The non-transitory machine-readable medium of claim 18 , wherein the respective elements are arranged as columns and rows, and wherein the applying of the voltages from the selected configuration of voltage values comprises applying a respective voltage per respective row of the respective elements.
20 . The non-transitory machine-readable medium of claim 17 , wherein the obtaining of the signal code data comprises receiving the signal code data encoded into at least one of: an infrared signal, a radio frequency signal, or a wired signal.