# US 2017/0288445 A1 · Shield for a wireless power transmitter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288445 A1 - Document ID: US20170288445A1 - Status: Published application - Kind: A1 - Application number: 15/088,277 - Filed: 2016-04-01 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Jaejin Lee; Chung-Hao J. Chen; Zhen Yao; Songnan Yang; Jonathan Rosenfeld; Sreenivas Kasturi - Web page: https://patentgrep.com/patent/US20170288445A1 ## CPC - H01F 38/14: Inductive couplings - H01F 27/363: {made of electrically conductive material} - H02J 7/04: Regulation of charging current or voltage - H02J 50/005: {Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices} - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H04B 5/79: for data transfer in combination with power transfer - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04B: TRANSMISSION ## Abstract Techniques for focusing the energy radiated by a wireless power transmitting unit are described. An example power transmitting unit includes a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area. The power transmitting unit also includes a power generating circuitry to deliver current to the transmit coil to generate the magnetic field. The power transmitting unit also includes a patch array disposed in parallel with the transmit coil to reduce the strength of the magnetic field at frequencies outside of the operating frequency during operation of the power transmitting unit. ## Claims ### Claim 1 A power transmitting unit, comprising: a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area; a power generating circuitry to deliver current to the transmit coil to generate the magnetic field at an operating frequency; and a patch array disposed in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the power transmitting unit. ### Claim 2 (depends on 1) The power transmitting unit of claim 1, wherein the patch array comprises an array of conductive patches disposed below the transmit coil. ### Claim 3 (depends on 2) The power transmitting unit of claim 2, wherein each of the conductive patches is coupled to an adjacent conductive patch of the patch array through a resonant circuit. ### Claim 4 (depends on 3) The power transmitting unit of claim 3, wherein the resonant circuit comprises an LC circuit comprising a capacitor and an inductor in parallel. ### Claim 5 (depends on 1) The power transmitting unit of claim 1, wherein the patch array comprises array of conductive patches coupled to a ground plane disposed in parallel with the conductive patches. ### Claim 6 (depends on 5) The power transmitting unit of claim 5, wherein the conductive patches are separated from the ground plane by an insulating material and conductively coupled to the ground plane by a via through the insulating material. ### Claim 7 (depends on 6) The power transmitting unit of claim 6, wherein the conductive patches comprise an outer patch separated from the via by a gap, wherein the outer patch is conductively coupled to the via through an LC circuit. ### Claim 8 (depends on 1) The power transmitting unit of claim 1, wherein the power transmitting unit is built into a table top. ### Claim 9 A method of manufacturing a power transmitting unit, comprising: forming a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area; conductively coupling a power generating circuitry to the transmit coil, the power generating circuitry to deliver current to the transmit coil to generate the magnetic field at an operating frequency; and disposing a patch array in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the power transmitting unit. ### Claim 10 (depends on 9) The method of claim 9, wherein the patch array comprises an array of conductive patches disposed below the transmit coil. ### Claim 11 (depends on 10) The method of claim 10, wherein each of the conductive patches is coupled to an adjacent conductive patch of the patch array through a resonant circuit. ### Claim 12 (depends on 11) The method of claim 11, wherein the resonant circuit comprises an LC circuit comprising a capacitor and an inductor in parallel. ### Claim 13 (depends on 9) The method of claim 9, wherein the patch array comprises array of conductive patches coupled to a ground plane disposed in parallel with the conductive patches. ### Claim 14 (depends on 13) The method of claim 13, wherein the conductive patches are separated from the ground plane by an insulating material and conductively coupled to the ground plane by a via through the insulating material. ### Claim 15 (depends on 14) The method of claim 14, wherein the conductive patches comprise an outer patch separated from the via by a gap, wherein the outer patch is conductively coupled to the via through an LC circuit. ### Claim 16 (depends on 9) The method of claim 9, comprising disposing the power transmitting unit into a table top. ### Claim 17 A wireless charger, comprising: a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area; a power generating circuitry to deliver current to the transmit coil to generate the magnetic field at an operating frequency; and a patch array disposed in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the wireless charger. ### Claim 18 (depends on 17) The wireless charger of claim 17, wherein the patch array comprises an array of conductive patches disposed below the transmit coil. ### Claim 19 (depends on 18) The wireless charger of claim 18, wherein each of the conductive patches is coupled to an adjacent conductive patch of the patch array through a resonant circuit. ### Claim 20 (depends on 19) The wireless charger of claim 19, wherein the resonant circuit comprises an LC circuit comprising a capacitor and an inductor in parallel. ### Claim 21 (depends on 17) The wireless charger of claim 17, wherein the patch array comprises array of conductive patches coupled to a ground plane disposed in parallel with the conductive patches. ### Claim 22 (depends on 21) The wireless charger of claim 21, wherein the conductive patches are separated from the ground plane by an insulating material and conductively coupled to the ground plane by a via through the insulating material. ### Claim 23 (depends on 22) The wireless charger of claim 22, wherein the conductive patches comprise an outer patch separated from the via by a gap, wherein the outer patch is conductively coupled to the via through an LC circuit. ### Claim 24 (depends on 17) The wireless charger of claim 17, wherein the wireless charger is disposed within a table top.