Active redirection devices for wireless applications
Examples disclosed herein relate to a meta-structure based active reflectarray for passive and active reflection. A control module is coupled to reflection elements to provide energy and change the phase of the elements.
1. An active redirection system, comprising:
a redirection device of reflective elements having sizes, shapes and configurations configured to generate a first phase distribution across the redirection device, the first phase distribution having a first reflection direction;
a control module coupled to the redirection device and adapted to provide energy to one or more reflective elements to generate a second phase distribution across the redirection device, the second phase distribution having a second reflection direction; and
a plurality of passive redirection devices each having a respective reflection phase, wherein the plurality of passive redirection devices are configured to generate a plurality of RF beams,
wherein the active redirection system is configured for reflecting millimeter wave signals.
2. The active redirection system of claim 1 , wherein the redirection device is further configured to operate as a relay between a source and a receiving device to spread the RF signal, thereby increasing a coverage area of the source.
3. The active redirection system of claim 2 , wherein the source has a first coverage area, and the redirection device has a second and third coverage area.
4. The active redirection system of claim 3 , wherein the redirection device operates as a passive reflectarray for a default reflection direction.
5. The active redirection system of claim 4 , further comprising an amplification module.
6. The active redirection system of claim 5 , further comprising a plurality of phase shifters.
7. The active redirection system of claim 1 , further comprising a plurality of phase shifters.
8. The active redirection system of claim 1 , wherein the control module further comprises a memory storing mappings for control settings to reflection directions.
9. The active redirection system of claim 1 , wherein the reflective elements comprise a reflector element, a dipole element, or a miniature reflector element.
10. The active redirection system of claim 1 , further comprising a repeater adapted to redirect signals from a transmitter to a receiver.
11. The active redirection system of claim 10 , wherein the control module is adapted to direct the reflectarray and the repeater in a same direction.
12. An active redirection device, comprising:
an array of radiating elements;
a beam control module coupled to the array, comprising:
a phase shift module; and
a gain control module; and
a plurality of passive redirection devices each having a respective reflection phase, wherein the plurality of passive redirection devices are configured to generate a plurality of radio frequency (RF) beams, wherein the active redirection device is configured to reflect millimeter wave signals.
13. The active redirection device as in claim 12 , wherein the beam control module is adapted to control a directivity of a beam from the array.
14. The active redirection device as in claim 12 , wherein the array is configured as a plurality of subarrays.
15. The active redirection device as in claim 14 , wherein the beam control module is adapted to control a directivity in a first direction for a first subarray and a second direction for a second subarray.
16. The active redirection device as in claim 15 , wherein the active redirection device is adapted for transmission of directed wireless communication signals.
17. The active redirection device as in claim 12 , further comprising:
a plurality of transmitters, each adapted to transmit a signal at a different phase shifts, wherein signals from the plurality of transmitters are distinguishable at a receive module.
18. The active redirection device as in claim 17 , wherein the active redirection device is part of a virtual MIMO system.
19. An active redirection system, comprising:
a redirection device of reflective elements having sizes, shapes and configurations configured to generate a first phase distribution across the redirection device, the first phase distribution having a first reflection direction;
a control module coupled to the redirection device and adapted to provide energy to one or more reflective elements to generate a second phase distribution across the redirection device, the second phase distribution having a second reflection direction; and
a repeater adapted to redirect signals from a transmitter to a receiver,
wherein the active redirection device is configured for reflecting millimeter wave signals, and
wherein the active redirection device is configured to operate as a relay between a source and the receiver to spread the RF signal, thereby increasing a coverage area of the source.