Optically controlled meta-material phased array antenna system

Patent metadata

Field	Value
Publication number	US-11088447-B2
Application number	US-202016738239-A
Country	US
Kind code	B2
Filing date	Jan 9, 2020
Priority date	Jan 30, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A system includes a base station. The base station includes: a laser assembly that transmits an optical control beam to a phased array antenna external to and remote from the base station; and a radio frequency (RF) transceiver that transmits a radio signal to the phased array antenna. The phased array antenna deflects the radio signal arriving at the phased array antenna in a particular direction indicated by the optical control beam. The particular direction of the deflected radio signal is toward a particular user device.

First claim

What is claimed is:

1. A system comprising:
a base station comprising:
a laser assembly that transmits an optical control beam to a phased array antenna external to and remote from the base station; and
a radio frequency (RF) transceiver that transmits a radio signal to the phased array antenna,

wherein the phased array antenna deflects the radio signal arriving at the phased array antenna in a particular direction indicated by the optical control beam, and
wherein the particular direction of the deflected radio signal is toward a particular user device.

2. The system of claim 1 , wherein the laser assembly transmits the optical control beam to the phased array antenna over a first time period;
wherein the RF transceiver transmits the radio signal over a second time period; and
wherein the first time period begins before or at a same time that the second time period begins and the first time period ends after or at a same time that the second time period ends.

3. The system of claim 1 , wherein the radio signal includes an Orthogonal Frequency Division Multiplexing (OFDM) signal over a Fifth Generation (5G) carrier.

4. The system of claim 3 , wherein the base station further includes:
an OFDM module that receives an input bit stream, processes the bit stream, and outputs feed signals having orthogonal subcarriers to the RF transceiver and outputs optical control signals; and
an optical controller that receives the optical control signals to control the laser assembly to generate the optical control beam.

5. The system of claim 4 , wherein the laser assembly includes an array of lasers, and when the optical controller controls the laser assembly, the optical controller causes the laser assembly to set an intensity of each laser beam generated by the array of lasers.

6. The system of claim 5 , wherein each laser of the array of lasers generates a laser beam at a frequency different from frequencies of laser beams from other lasers in the array of lasers, wherein the laser assembly includes one or more optical multiplexers to combine the laser beams from the array of lasers into a single beam.

7. The system of claim 4 , wherein the optical control signals include information for the optical controller to determine a deflection angle for the radio signal to be in the particular direction; and
wherein the optical controller determines the particular direction based on the optical control signals and causes the optical control beam to indicate the particular direction to the phrased array antenna.

8. The system of claim 4 , wherein the optical control signals include information used to select, by the optical controller, the phased array antenna, from a plurality of phased array antennas; and
wherein the optical controller directs the optical control beam to the selected phased array antenna.

9. The system of claim 1 , further comprising the phrased array antenna, wherein the phased array antenna includes:
a rear panel comprising:
a first array of phase shift elements; and
a second array of rear antenna elements;

a front panel comprising:
a third array of front antenna elements,

wherein each of the front antenna elements is electrically coupled to a corresponding one of the rear antenna elements through one of the phase shift elements, and
wherein when the second array of rear antenna elements receives the radio signal, from the base station and the first array of phase shift elements receives the optical control beam from the base station, the third array of front antenna elements transmits the deflected radio signal in the particular direction.

10. The system of claim 9 , wherein the phase shift elements include photodiode and capacitor pairs.

11. The system of claim 9 , wherein the phase shift elements include:
photo-varactor diodes.

12. The system of claim 9 , wherein each of the rear antenna elements and front antenna elements includes a patch of conducting material.

13. The system of claim 9 , wherein each of the rear panel and front panel includes a printed circuit board (PCB).

14. The system of claim 9 , wherein each of the rear antenna elements includes an electrical contact to one of the phase shift elements.

15. The system of claim 9 , wherein the first array of phase shift elements receives the optical control beam from the base station through an optical fiber.

16. The system of claim 9 , wherein the wavelength of the radio signal is less than about 20 millimeters.

17. A method comprising:
receiving a bit stream;
processing the bit stream to output feed signals to a radio frequency (RF) transceiver to generate an RF signal;
outputting optical control signals to control a laser assembly to transmit an optical control beam; and
transmitting the optical control beam and the RF signal to the phased array antenna,
wherein the optical control beam includes information that indicates a particular direction in which the phased array antenna is to deflect the radio signal.

18. The method of claim 17 , wherein outputting the optical control signals to control the laser assembly includes:
determining, based on information included in the optical control signals, the particular direction.

19. The method of claim 17 , wherein transmitting the optical control beam includes:
generating a plurality of laser beams;
setting, for each of the laser beams to be generated by the array of lasers, an intensity of the laser beam.

20. The method of claim 19 , wherein transmitting the optical control beam further includes:
optically multiplexing one or more of the laser beams to generate the optical control beam.

Assignees

• Verizon Patent & Licensing Inc

Inventors

• Polehn Donna L
• Weisbrod Fred

Classifications

• H01Q3/2676 Primary

  Optically controlled phased array · CPC title

• H01Q21/065

  Patch antenna array · CPC title

• H01Q9/045

  with particular feeding means (for circular polarisation H01Q9/0428) · CPC title

• H01Q1/523

  between antennas of an array · CPC title

• H01Q1/246

  specially adapted for base stations · CPC title