System and method for wireless power transfer using time reversed electromagnetic wave propagation

Patent metadata

Field	Value
Publication number	US-11101915-B2
Application number	US-201716096430-A
Country	US
Kind code	B2
Filing date	Apr 25, 2017
Priority date	Apr 25, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

The subject method for delivering power to a moving target wirelessly via electromagnetic time reversal can find applications in wireless electrical transmission to portable devices, wireless heating of portable devices, novel wirelessly powered accelerometers, hyperthermic treatment of cancers, and many other applications. The subject non-linear time reversed electromagnetic waves based wireless power transmission (WPT) system targets either a single linear or non-linear object where a selective targeting between two diodes has been demonstrated simultaneously with different degrees of non-linearity in a three-dimensional ray-chaotic billiard model. A dual-purpose rectenna with harmonic generation for wireless power transfer by non-linear time-reversal has been designed for the subject system using the Schottky diode.

First claim

What is claimed is:

1. A method for wireless power transfer to a target of interest using time-reversed electromagnetic wave propagation, comprising:
(a) establishing a three-dimensional reverberant complex scattering environment;
(b) positioning a transmitting antenna and a receiving antenna in said reverberant complex scattering environment;
(c) positioning at least one passive non-linear object in said reverberant complex scattering environment;
(d) broadcasting an initial signal of a predetermined amplitude at a first frequency from said transmitting antenna,
wherein said initial signal causes a non-linear response signal generated by said at least one passive non-linear object at a second frequency depending on a predetermined voltage V k , said at least one passive non-linear object generating said non-linear response signal when excited above said predetermined voltage V k ,
(e) recording a resulting signal at said receiving antenna, said resulting signal being composed of a signal corresponding to said initial signal sent from said transmitting antenna and said non-linear response signal from said at least one passive non-linear object;
(f) extracting said non-linear response signal from said resulting signal using pulse-inversion filtering;
(g) time-reversing said extracted non-linear response signal, thus forming a time-reversed extracted non-linear response signal; and,
(h) re-emitting said time-reversed extracted non-linear response signal from said receiving antenna into said reverberating complex scattering environment to create a reconstruction non-linear signal collapsing at said least one passive non-linear object, thus tracking said at least one non-linear object and delivering power thereto, wherein said reconstruction non-linear signal constitutes said delivered power.

2. The method of claim 1 , further comprising:
in said step (c), positioning at least two passive non-linear objects in said reverberant complex scattering environment, said at least two non-linear passive objects having different voltages V k , said voltage V k determining the strength of the non-linear response.

3. The method of claim 1 , further comprising:
in said step (c), varying said voltage V k to control said non-linear response.

4. The method of claim 2 , further comprising:
in said step (d), broadcasting said initial signal from said transmitting antenna at different amplitudes to control the strength of the non-linear response and to track a corresponding one of said at least two non-linear passive objects.

5. The method of claim 1 , wherein said at least one passive non-linear object includes portable electronic devices, diodes, accelerometers, tumors.

6. The method of claim 1 , wherein said power transmission to said at least one passive non-linear object includes wireless electrical transmission, wireless heating, hyperthermic treatment of cancers.

7. The method of claim 1 , further comprising:
in step (e), rectifying said recorded resulting signal at said receiving antenna.

8. The method of claim 7 , further comprising:
generating, at said receiving antenna, non-linear harmonic adequate for the signal time-reversing in said step (g).

9. The method of claim 1 , further comprising:
in said step (e), coupling a Schottky diode to said receiving antenna providing a dual-purpose antenna with rectification and non-linear harmonic generation.

10. A system for wireless power transfer to a target of interest using time-reversed electromagnetic wave propagation, comprising:
(a) a transmitting antenna and a receiving antenna positioned in a reverberant complex scattering environment, said transmitting antenna broadcasting an initial signal of a predetermined amplitude at a first frequency;
(b) at least one passive non-linear object positioned in said reverberant complex scattering environment, said at least one passive non-linear object generating a response non-linear signal when excited above a predetermined voltage V k ;
(c) a processing system coupled to said receiving antenna and said at least one passive non-linear object, said processing system being configured for recording a resulting signal at said receiving antenna, wherein said resulting signal is composed of a signal corresponding to said initial signal broadcast from said transmitting antenna and said non-linear response signal emitted from said at least one passive non-linear object,
(d) a pulse-inversion filter sub-system coupled to said processing system and configured for extracting said non-linear response signal from said resulting signal using pulse-inversion filtering; and
(e) a time-reversing sub-system coupled to said processing system and said pulse inversion filter sub-system and configured for time-reversing said extracted non-linear response signal;
wherein said processing system is further configured to control re-emitting of said time-reversed non-linear response signal from said receiving antenna into said reverberating complex scattering environment to create a reconstruction non-linear signal at said at least one passive non-linear object, said reconstruction non-linear signal corresponding to a power transmitted to said at least one passive non-linear object.

11. The system of claim 10 , further comprising:
at least two non-linear passive objects positioned in said reverberant complex scattering environment, said at least two non-linear passive objects having different voltages V k determining the strength of the non-linear response.

12. The system of claim 10 , wherein said processing system is further configured to vary said voltage V k to control said non-linear response.

13. The system of claim 11 , wherein said processing system is further configured for broadcasting said initial signal from said transmitting antenna at different amplitudes to control the strength of the non-linear response and to target a corresponding one of said at least two non-linear passive objects.

14. The system of claim 10 , wherein said at least one passive non-linear object includes portable electronic devices, diodes, accelerometers, tumors, and wherein said power transmission to said at least one passive non-linear object includes wireless electrical transmission, wireless heating, hyperthermic treatment of cancers.

15. The system of claim 10 , further comprising:
a Schottky diode coupled to said receiving antenna to result in a dual-purpose antenna with rectification and non-linear harmonic generation.

Assignees

• Univ Maryland

Inventors

• Anlage Steven Mark
• Cangialosi Frank
• Grover Tyler
• Simon Andrew
• Roman Scott
• Tao Liangcheng

Classifications

• H04K1/06 Primary

  by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards · CPC title

• H02J50/27

  characterised by the type of receiving antennas, e.g. rectennas · CPC title

• H04K3/68

  using passive jamming, e.g. by shielding or reflection (shielding of apparatus or components against electric or magnetic field H05K9/00) · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• H04K1/00

  Secret communication · CPC title