# US 12,191,932 B2 · Apparatus for minimizing electromagnetic coupling between surface mount device inductors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,932 B2 - Document ID: US12191932B2 - Status: Granted - Kind: B2 - Application number: 18/146,213 - Filed: 2022-12-23 - Published: 2023-04-27 - Granted: 2025-01-07 - Earliest claimed: 2018-12-10 - Assignees: Skyworks Solutions, Inc. - Applicants: Skyworks Solutions, Inc. - Inventors: John C. Baldwin; Weimin Sun - Web page: https://patentgrep.com/patent/US12191932B2 ## CPC - H04B 5/26: using coils - H01F 17/0013: {with stacked layers} - H01F 27/28: Coils; Windings; Conductive connections - H01F 27/2885: {with shields or electrodes (shields or electrodes for pancake coils H01F27/2871; construction of electric or magnetic shields or screens H01F27/36)} - H01F 27/292: {Surface mounted devices} - H01F 27/32: Insulating of coils, windings, or parts thereof - H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10) - H01F 27/363: {made of electrically conductive material} - H05K 1/0216: {Reduction of cross-talk, noise or electromagnetic interference (grounding H05K1/0215)} - H05K 1/0243: {Printed circuits associated with mounted high frequency components} - H10W 42/20: protecting against electromagnetic or particle radiation, e.g. light, X-rays, gamma-rays or electrons - H05K 2201/1003: Non-printed inductor - H04B: TRANSMISSION - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A surface mount device inductor has a package casing sized to attenuate electromagnetic coupling between the inductor coils of the surface mount device inductors. The surface mount device inductor includes an inductor coil, an anode structure disposed over a first end of the inductor coil and a cathode structure disposed over a second end of the inductor coil opposite the first end, the cathode structure being spaced apart from the anode structure. One or both of the anode structure and the cathode structure comprise a shield portion disposed at least partially over the inductor coil to thereby reduce electromagnetic coupling between adjacent surface mount device inductors. The package casing makes the surface mount device inductors self-shielding. The surface mount device inductors can be incorporated into a radiofrequency module, and can be incorporated into a front end system of a wireless mobile device. ## Claims ### Claim 1 A surface mount device inductor mountable on a printed circuit board, comprising: an inductor coil configured to generate a magnetic field along an axis when a current is applied to the inductor coil; an anode structure having a box-like shape with a top wall, a bottom wall, a left-side wall, a right-side wall and an end wall that at least partially encloses a first end of the inductor coil, the top wall disposed over at least a portion of the inductor coil; and a cathode structure having a box-like shape with a top wall, a bottom wall, a left-side wall, a right-side wall and an end wall that at least partially encloses a second end of the inductor coil opposite the first end, the top wall of the cathode structure disposed over at least another portion of the inductor coil, the cathode structure being spaced apart from the anode structure, the anode structure and the cathode structure including a shield portion disposed at least partially over the inductor coil to thereby reduce electromagnetic coupling, the shield portion of the anode structure and the cathode structure including the top wall thereof and a first portion of the left-side wall and of the right-side wall thereof that extends from the top wall to a location between the top wall and the bottom wall thereof, a second portion of the left-side wall and of the right-side wall thereof that is adjacent the end wall thereof extending from the top wall to the bottom wall thereof. ### Claim 2 (depends on 1) The surface mount device inductor of claim 1 wherein the shield portion is an ungrounded metal portion. ### Claim 3 (depends on 1) The surface mount device inductor of claim 1 wherein the shield portion of one of the anode structure and the cathode structure has a greater length than the shield portion of the other of the anode structure and the cathode structure. ### Claim 4 (depends on 1) The surface mount device inductor of claim 1 wherein the first portion of the left-side wall and of the right-side wall is spaced apart from the printed circuit board. ### Claim 5 (depends on 1) The surface mount device inductor of claim 1 wherein the axis extends transverse to a plane that defines the left-side wall of one or both of the anode structure and the cathode structure. ### Claim 6 (depends on 1) The surface mount device inductor of claim 1 wherein the axis extends transverse to a plane that defines the top wall of one or both of the anode structure and the cathode structure. ### Claim 7 (depends on 1) The surface mount device inductor of claim 1 wherein the anode structure is continuous and the cathode structure is continuous. ### Claim 8 A radiofrequency module, comprising: a printed circuit board including a substrate layer; and one or more surface mount device inductors mounted on the substrate layer, each surface mount device inductor including: an inductor coil configured to generate a magnetic field along an axis when a current is applied to the inductor coil; an anode structure having a box-like shape with a top wall, a bottom wall, a left-side wall, a right-side wall and an end wall that at least partially encloses a first end of the inductor coil, the top wall disposed over at least a portion of the inductor coil; and a cathode structure having a box-like shape with a top wall, a bottom wall, a left-side wall, a right-side wall and an end wall that at least partially encloses a second end of the inductor coil opposite the first end, the top wall of the cathode structure disposed over at least another portion of the inductor coil, the cathode structure being spaced apart from the anode structure, the anode structure and the cathode structure including a shield portion disposed at least partially over the inductor coil to thereby reduce electromagnetic coupling, the shield portion of the anode structure and the cathode structure including the top wall thereof and a first portion of the left-side wall and of the right-side wall thereof that extends from the top wall to a location between the top wall and the bottom wall thereof, a second portion of the left-side wall and of the right-side wall thereof that is adjacent the end wall thereof extending from the top wall to the bottom wall thereof. ### Claim 9 (depends on 8) The radiofrequency module of claim 8 wherein the shield portion is an ungrounded metal portion. ### Claim 10 (depends on 8) The radiofrequency module of claim 8 wherein the shield portion of one of the anode structure and the cathode structure has a greater length than the shield portion of the other of the anode structure and the cathode structure. ### Claim 11 (depends on 8) The radiofrequency module of claim 8 wherein the first portion of the left-side wall and of the right-side wall is spaced apart from the substrate layer. ### Claim 12 (depends on 8) The radiofrequency module of claim 8 wherein the axis extends transverse to a plane that defines the left-side wall of one or both of the anode structure and the cathode structure. ### Claim 13 (depends on 8) The radiofrequency module of claim 8 wherein the axis extends transverse to a plane that defines the top wall of one or both of the anode structure and the cathode structure. ### Claim 14 (depends on 8) The radiofrequency module of claim 8 wherein the anode structure is continuous and the cathode structure is continuous. ### Claim 15 A wireless mobile device comprising: one or more antennas; and a front end system that communicates with the one or more antennas, the front end system including one or more surface mount device inductors mounted on a substrate layer, each surface mount device inductor including: an inductor coil configured to generate a magnetic field along an axis when a current is applied to the inductor coil; an anode structure having a box-like shape with a top wall, a bottom wall, a left-side wall, a right-side wall and an end wall that at least partially encloses a first end of the inductor coil; and a cathode structure having a box-like shape with a top wall, a bottom wall, a left-side wall, a right-side wall and an end wall that at least partially encloses a second end of the inductor coil opposite the first end, the top wall of the cathode structure disposed over at least another portion of the inductor coil, the cathode structure being spaced apart from the anode structure, the anode structure and the cathode structure including a shield portion disposed at least partially over the inductor coil to thereby reduce electromagnetic coupling, the shield portion of the anode structure and the cathode structure including the top wall thereof and a first portion of the left-side wall and of the right-side wall thereof that extends from the top wall to a location between the top wall and the bottom wall thereof, a second portion of the left-side wall and of the right-side wall thereof that is adjacent the end wall thereof extending from the top wall to the bottom wall thereof. ### Claim 16 (depends on 15) The wireless mobile device of claim 15 wherein the shield portion is an ungrounded metal portion. ### Claim 17 (depends on 15) The wireless mobile device of claim 15 wherein the shield portion of one of the anode structure and the cathode structure has a greater length than the shield portion of the other of the anode structure and the cathode structure. ### Claim 18 (depends on 15) The wireless mobile device of claim 15 wherein the first portion of the left-side wall and of the right-side wall is spaced apart from the substrate layer. ### Claim 19 (depends on 15) The wireless mobile device of claim 15 wherein the axis extends transverse to a plane that defines the left-side wall of one or both of the anode structure and the cathode structure. ### Claim 20 (depends on 15) The wireless mobile device of claim 15 wherein the axis extends transverse to a plane that defines the top wall of one or both of the anode structure and the cathode structure. ### Claim 21 (depends on 15) The wireless mobile device of claim 15 wherein the shield portion extends along a height relative to the substrate layer that is smaller than a height of the anode structure and a height of the cathode structure relative to the substrate layer.