# US 11,114,885 B2 · Transmitter and receiver structures for near-field wireless power charging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,885 B2 - Document ID: US11114885B2 - Status: Granted - Kind: B2 - Application number: 16/379,689 - Filed: 2019-04-09 - Published: 2019-12-05 - Granted: 2021-09-07 - Earliest claimed: 2015-12-24 - Assignees: Energous Corporation - Applicants: Energous Corporation - Inventors: Alister Hosseini; Michael A. Leabman - Web page: https://patentgrep.com/patent/US11114885B2 ## CPC - H02J 7/70: characterised by the mechanical construction - H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries - H02J 50/05: using capacitive coupling - H02J 50/10: using inductive coupling - H02J 50/20: using microwaves or radio frequency waves - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A wireless charging system comprises (i) a transmitter structure comprising a first metallic core disposed in an opening of the transmitter structure and (ii) a receiver structure comprising a second metallic core disposed in an opening of the receiver structure. The transmitter structure is configured to carry one or more radio frequency (RF) signals to the first metallic core when the receiver structure is within a threshold distance from the transmitter structure. In addition, the receiver structure is configured to be excited by the one or more RF signals from the transmitter structure, whereby the one or more RF signals are transferred from the first metallic core to the second metallic core when the transmitter structure and the receiver structure are within the threshold distance from each other. ## Claims ### Claim 1 A transmitter structure for delivering wireless power, comprising: a housing; a metallic core disposed in an opening defined by the housing; and one or more magnets, integrated with a surface of the housing, configured to magnetically attract one or more other magnets integrated with a receiver structure in order to bring and maintain the transmitter structure and the receiver structure within a threshold distance from each other, wherein: the transmitter structure is configured to carry one or more radio frequency (RF) signals to the metallic core when the receiver structure is within the threshold distance from the transmitter structure, and the receiver structure is configured to receive and convert the one or more RF signals into usable energy to power an electronic device coupled to the receiver structure. ### Claim 2 (depends on 1) The transmitter structure of claim 1, wherein the housing is configured to keep desired currents inside the transmitter structure and undesired currents outside of the transmitter structure. ### Claim 3 (depends on 1) The transmitter structure of claim 1, wherein the surface of the housing includes one or more non-skid regions to resist motion of the receiver structure when the receiver structure is within the threshold distance from the transmitter structure. ### Claim 4 (depends on 1) The transmitter structure of claim 1, wherein the transmitter structure operates as an open circuit when the receiver structure is not within the threshold distance from the transmitter structure, such that wireless power does not leak from the transmitter structure. ### Claim 5 (depends on 1) The transmitter structure of claim 1, wherein the surface of the housing is a planar surface configured to be positioned adjacent to a planar surface of the receiver structure when the receiver structure is within the threshold distance from the transmitter structure. ### Claim 6 (depends on 1) The transmitter structure of claim 1, wherein the housing comprises at least one metamaterial. ### Claim 7 (depends on 1) The transmitter structure of claim 1, wherein the metallic core is at a center location of the housing. ### Claim 8 (depends on 1) The transmitter structure of claim 1, wherein: the transmitter structure is part of a charging device; and the housing is also part of the charging device. ### Claim 9 (depends on 1) The transmitter structure of claim 1, further comprising a transmission line that feeds the one or more RF signals. ### Claim 10 A wearable electronic device for receiving wireless power, comprising: a receiver structure, including: a housing; a metallic core disposed in an opening defined by the housing; and one or more magnets, integrated with a surface of the housing, configured to magnetically attract one or more other magnets integrated with a transmitter structure in order to bring and maintain the transmitter structure and the receiver structure within a threshold distance from each other, wherein: the transmitter structure is configured to transfer one or more radio frequency (RF) signals to the metallic core when the receiver structure is within the threshold distance from the transmitter structure, and the receiver structure is configured to convert the one or more RF signals into usable energy to power the wearable electronic device. ### Claim 11 (depends on 10) The wearable electronic device of claim 10, wherein the wearable electronic device is a wearable watch. ### Claim 12 (depends on 10) The wearable electronic device of claim 10, further comprising a battery, wherein receiver structure is further configured to convert the one or more RF signals into usable energy to charge the battery. ### Claim 13 (depends on 10) The wearable electronic device of claim 10, further comprising one or more switch elements configured to (i) detect the one or more RF signals transferred by the transmitter structure, and (ii) direct the one or more RF signals to conversion circuitry when a power level of the one or more RF signals exceeds a threshold. ### Claim 14 (depends on 13) The wearable electronic device of claim 13, wherein the one or more switch elements minimize power surges in the wearable electronic device, thereby protecting components of the wearable electronic device from power-surge related damage. ### Claim 15 (depends on 10) The wearable electronic device of claim 10, wherein the housing is configured to keep desired currents inside the receiver structure and undesired currents outside of the receiver structure. ### Claim 16 (depends on 10) The wearable electronic device of claim 10, wherein the threshold distance is less than 10 mm. ### Claim 17 (depends on 10) The wearable electronic device of claim 10, wherein the receiver structure is further configured to be excited by the one or more RF signals transferred from the transmitter structure when the receiver structure is within the threshold distance from the transmitter structure. ### Claim 18 (depends on 10) The wearable electronic device of claim 10, wherein the receiver structure further comprises circuitry to convert the one or more RF signals into usable energy to power the wearable electronic device. ### Claim 19 (depends on 18) The wearable electronic device of claim 18, wherein the circuitry includes a rectifier and a power converter. ### Claim 20 A wireless charging system comprising: a transmitter structure comprising: a first metallic core disposed in an opening of the transmitter structure; and one or more first magnets; and a receiver structure comprising: a second metallic core disposed in an opening of the receiver structure; and one or more second magnets, wherein: the one or more first magnets are configured to magnetically attract the one or more second magnets in order to bring and maintain the transmitter structure and the receiver structure within a threshold distance from each other, the transmitter structure is configured to transfer one or more radio frequency (RF) signals from the first metallic core to the second metallic core when the receiver structure is within the threshold distance from the transmitter structure, and the receiver structure is configured to convert the one or more RF signals into usable energy to power an electronic device coupled to the receiver structure.