US 10,320,446 B2Granted

Miniaturized highly-efficient designs for near-field power transfer system

AssigneeEnergous Corporation

InventorsAlister Hosseini, Michael A. Leabman

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Abstract

Near-field power transfer systems can include antenna elements that constructed or printed close to each other in a meandered arrangement, where neighboring antenna elements conduct currents that flow in opposite directions. This current flow entirely or almost entirely cancels out any far field RF radiation generated by the antennas or otherwise generated by the electromagnetic effects of the current flow. For a first current flowing in a first path, there may be a second current flowing in a second cancellation path, which cancels the far field radiation produced by the first current flowing in the first path. Therefore, there may be no radiation of power to the far field. Such cancellation, may not occur in a near-field active zone, where the transfer of power may occur between the transmitter and the receiver. A ground plane may block the leakage of power from the back of a transmitter and/or a receiver.

Claims18

Dependent claims

A near-field radio frequency (RF) power transfer system comprising a transmitter, the transmitter comprising:

a first antenna element disposed on or below a first surface of a substrate and configured to carry a first current in a first direction during a first time period to generate a first RF radiation;
a second antenna element disposed on or below the first surface of the substrate and configured to carry a second current in a second direction, distinct from and opposite to the first direction, during the first time period to generate a second RF radiation such that (i) a far-field portion of the second RF radiation substantially cancels a far-field portion of the first RF radiation, and (ii) a near-field portion of the second RF radiation does not substantially cancel a near-field portion of the first RF radiation;
a ground plane disposed on or below a second surface of the substrate, wherein the second surface is opposite to the first surface;
a first via passing through the ground plane, wherein the first via contains a first power feed line configured to supply the first current;
and
a second via passing through the ground plane, wherein the second via is distinct from the first via and contains a second power feed line configured to supply the second current.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/269,729Filed 19 Sep 2016 · continuation in part
Priority: 24 Dec 2015
Published: US 2017/0187227 A129 Jun 2017
Granted: 11 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04B 5/75
Specially adapted for specific purposes: for isolation purposes
H01F 38/14
Adaptations of transformers or inductances for specific applications or functions: inductive couplings
H02J 50/005
Circuit arrangements or systems for wireless supply or distribution of electric power: mechanical details of housing or structure aiming to…
H02J 50/23
Using microwaves or radio frequency waves: characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas

Family

Application62/387,205Us provisional application · filed 24 Dec 2015
Application15/046,348Parent of this continuation-in-part · filed 17 Feb 2016
Application62/374,578Us provisional application · filed 12 Aug 2016
US 2017/0187422 A1Pre-grant publication · published 29 Jun 2017
US 10,027,158 B2Parent of this continuation-in-part
US 2017/0187227 A1Published application
US 10,320,446 B2This patent

From the US filing history. Foreign family members aren’t listed.

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