# US 11,277,903 B2 · Pattern-edged metal-plane resonance-suppression > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,277,903 B2 - Document ID: US11277903B2 - Status: Granted - Kind: B2 - Application number: 16/368,221 - Filed: 2019-03-28 - Published: 2020-10-01 - Granted: 2022-03-15 - Earliest claimed: 2019-03-28 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Stephen Harvey Hall; Khang Choong Yong; Ying Ern Ho; Yun Rou Lim; Wil Choon Song - Web page: https://patentgrep.com/patent/US11277903B2 ## CPC - H05K 1/0225: {Single or multiple openings in a shielding, ground or power plane (H05K1/0227 takes precedence)} - H05K 1/025: {Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance (H05K1/024 and H05K1/0243 take precedence; for semiconductor devices H10W44/20)} - G05B 19/4097: characterised by using design data to control NC machines, e.g. CAD/CAM (G05B19/4093 takes precedence) - H05K 1/0224: {Patterned shielding planes, ground planes or power planes (H05K1/0253 takes precedence)} - H05K 3/027: {the conductive material being removed by irradiation, e.g. by photons, alpha or beta particles} - G05B 2219/45026: Circuit board, pcb - G05B 2219/45034: Adjusting, trimming circuits on printed boards - H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence) - H05K 2201/09027: Non-rectangular flat PCB, e.g. circular - H05K 2201/093: Layout of power planes, ground planes or power supply conductors, e.g. having special clearance holes therein - H05K 2201/098: Special shape of the cross-section of conductors, e.g. very thick plated conductors - H05K 2201/10098: Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) ## Abstract Apparatuses and methods are provided for mitigating radio frequency interference and electromagnetic compatibility issues caused by the resonance of metal planes of a circuit board. A method for controlling impedance at an edge of a circuit board includes creating a cut at an edge of a plane of the circuit board. The cut extends from the edge of the plane to a point at a depth into the plane. The method can further include creating a cut pattern in the edge of the plane by repeating the cut along the edge of the plane such that an impedance of the plane at the depth is different, or lower, than an impedance of the plane at the edge of the plane. Other aspects are described. ## Claims ### Claim 1 A method of controlling impedance at an edge of a circuit board to reduce radio-frequency (RF) emissions by the circuit board, the circuit board for use in a wireless communication device comprising an antenna, the circuit board having a power plane and a ground plane, the method comprising: creating a plurality of cuts at an edge of a the power plane of the circuit board, each cut extending from the edge of the power plane to a point at a depth into the power plane; and creating a cut pattern in one segment of the edge of the power plane by creating the plurality of the cuts along the edge of the power plane such that an impedance of the plane at the depth a each cut is different than an impedance of the power plane at the edge of the power plane, wherein at least a portion of the edge of the power plane includes no cuts, wherein shapes within the cut pattern comprise triangular shapes and semi-circular shapes, and wherein the cut pattern, including the points and the depths of the cuts and including the portion of the edge without cuts, is selected to suppress E-field intensity at one or more resonance frequencies of the power plane to reduce the RF emissions of the circuit board to reduce interference with the antenna. ### Claim 2 (depends on 1) The method of claim 1, wherein creating the cut pattern includes orienting angles of the plurality of cuts such that the cut pattern includes shapes with non-parallel sides. ### Claim 3 (depends on 1) The method of claim 1, wherein a cut of the cut pattern extends 0.4-0.8 millimeters into the plane. ### Claim 4 (depends on 3) The method of claim 3, wherein cuts extend different distances into the plane. ### Claim 5 (depends on 1) The method of claim 1, wherein the circuit board comprises a plurality of planes, including the power plane, and wherein creating the cut pattern is performed at the plurality of planes of the circuit board. ### Claim 6 (depends on 5) The method of claim 5, wherein the plurality of planes includes a ground plane, and wherein the creating the cut pattern is performed at a ground plane and at least one power plane. ### Claim 7 (depends on 5) The method of claim 5, wherein the plurality of planes includes a plurality of power planes, and wherein the creating the cut pattern is performed at a plurality of power planes.