Method, system and computer-readable recording medium for transferring wireless power by using antennas with high orders of spherical modes

• US 9,225,203 B2
• Filed: 02/15/2012
• Issued: 12/29/2015
• Est. Priority Date: 02/15/2012
• Status: Active Grant

• Current Assignee: SNU R&DB Foundation (Seoul National University)
• Original Assignee: SNU R&DB Foundation (Seoul National University)
• Inventors: Nam, Sang Wook, Kim, Yoon Goo
• Primary Examiner(s): Cavallari, Daniel
• Application Number:
  US13/397,522
• Publication Number:
  US 20130207477A1
• Time in Patent Office: 1,413 Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/23 characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas

Abstract

The present invention relates to a system for transferring wireless power or signal. The system includes a first antenna; and a second antenna which is located from the first antenna at an arbitrary distance and arranged in an arbitrary direction in comparison with the first antenna, wherein respective spherical modes of the first antenna and the second antenna are allowed to have orders which are same as or larger than a predetermined value to thereby transfer wireless power between the first antenna and the second antenna.

Claims

1. A method for acquiring an efficiency of power transfer in a wireless power transfer system, wherein the wireless power transfer system includes a first antenna;

and a second antenna which is located from the first antenna at an arbitrary distance and arranged in an arbitrary direction in comparison with the first antenna, and wherein respective spherical modes of the first antenna and the second antenna are allowed to have orders which are same as or larger than a predetermined value which is an integer greater than 1 to thereby transfer wireless power between the first antenna and the second antenna, comprising the steps of;

(a) acquiring scattering matrixes of the first antenna and the second antenna;

(b) acquiring a mode coefficients conversion matrix between the coordinate of the first antenna and that of the second antenna,

(c) acquiring Z-parameter or Y-parameter, reflecting mutual coupling effect between the first antenna and the second antenna, by referring to the acquired scattering matrixes and mode coefficients conversion matrix; and

(d) acquiring the maximum efficiency of power transfer between the first antenna and the second antenna by referring to the acquired Z-parameter or the Y-parameter.

2. The method of claim 1, wherein at least one mode index of each spherical mode has an order same as or larger than the predetermined value.

3. The method of claim 1, wherein the distance between the first antenna and the second antenna is determined by referring to a range which allows a first antenna sphere enclosing the first antenna and a second antenna sphere enclosing the second antenna not to be overlapped.