# US 8,570,114 B2 · Defected ground structure with shielding effect > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,114 B2 - Document ID: US8570114B2 - Status: Granted - Kind: B2 - Application number: 12/902,155 - Filed: 2010-10-12 - Published: 2012-03-08 - Granted: 2013-10-29 - Earliest claimed: 2010-09-08 - Assignees: National Taiwan University - Applicants: Tzong-Lin Wu; Yu-Hao Hsu; Chung-Hao Tsai - Inventors: Tzong-Lin Wu; Yu-Hao Hsu; Chung-Hao Tsai - Web page: https://patentgrep.com/patent/US8570114B2 ## CPC - H05K 9/0039: {Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing (printed shielding conductors, ground planes or power planes for reduction of cross-talk or noise in printed circuits H05K1/0218)} - H01P 1/2005: {Electromagnetic photonic bandgaps [EPB], or photonic bandgaps [PBG]} - H01P 1/2039: {Galvanic coupling between Input/Output} - H05K 1/0236: {Electromagnetic band-gap structures} - H05K 1/0253: {Impedance adaptations of transmission lines by special lay-out of power planes, e.g. providing openings (H05K1/0251 takes precedence)} - H05K 1/0225: {Single or multiple openings in a shielding, ground or power plane (H05K1/0227 takes precedence)} - H05K 2201/0969: Apertured conductors - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## Abstract A defected ground structure with shielding effect is provided. The structure includes a dielectric layer, a defected metal layer, a grounded metal layer and at least a conductive mushroom-like structure. The defected metal layer has a line-shaped opening and is disposed in the dielectric layer. The conductive mushroom-like structure is disposed between the defected metal layer and the grounded metal layer and is arranged along an extending direction of the line-shaped opening periodically. The conductive mushroom-like structure includes a laterally extending member and a vertically extending member. The laterally extending member is parallel to the defected metal layer and a distance is maintained away from the defected metal layer. The projection area of the laterally extending member on the defected metal layer covers a length of the line-shaped opening corresponding to the laterally extending member. The vertically extending member connects the laterally extending member and the grounded metal layer. ## Claims ### Claim 1 A defected ground structure with a shielding effect, comprising: a dielectric layer, having a first surface and a second surface opposite to the first surface; a defected metal layer, disposed in the dielectric layer and located between the first surface and the second surface, and having a line-shaped opening, wherein the defected metal layer does not connect the grounded metal layer; a grounded metal layer, disposed on the second surface; and at least one conductive mushroom-like structure, disposed between the defected metal layer and the grounded metal layer, arranged along an extending direction of the line-shaped opening periodically, and the conductive mushroom-like structure comprising: a laterally extending member, parallel to the defected metal layer, and a distance being maintained between the laterally extending member and the defected metal layer, wherein a projection area of the laterally extending member on the defected metal layer covers a portion of the line-shaped opening corresponding to the projection area of the laterally extending member; and a vertically extending member, connecting the laterally extending member and the grounded metal layer. ### Claim 2 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, wherein the defected metal layer has another line-shaped opening, and the projection area of the laterally extending member on the defected metal layer covers a portion of the other line-shaped opening corresponding to the projection area of the laterally extending member. ### Claim 3 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, wherein the vertically extending member comprises a conductive through via. ### Claim 4 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, wherein the vertically extending member comprises a plurality of turning sections. ### Claim 5 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, wherein the defected metal layer further comprises: a first rectangular opening; and a second rectangular opening, the first rectangular opening and the second rectangular opening being respectively connected to two ends of the line-shaped opening, and a length of a contact side of the first rectangular opening or the second rectangular opening and the line-shaped opening being greater than a width of the line-shaped opening. ### Claim 6 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, wherein the conductive mushroom-like structure is arranged along the extending direction of the line-shaped opening periodically, and a predetermined space is maintained between two adjacent conductive mushroom-like structures. ### Claim 7 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, wherein the distance between the laterally extending member and the defected metal layer is smaller than a distance between the laterally extending member and the grounded metal layer. ### Claim 8 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, wherein the laterally extending member is a metal layer. ### Claim 9 (depends on 8) The defected ground structure with the shielding effect as claimed in claim 8, wherein a shape of the metal layer comprises a rectangle, an ellipse or an irregular geometric figure. ### Claim 10 (depends on 8) The defected ground structure with the shielding effect as claimed in claim 8, wherein the vertically extending member penetrates through the metal layer. ### Claim 11 (depends on 1) The defected ground structure with the shielding effect as claimed in claim 1, further comprising: a first microstrip line, disposed on the first surface. ### Claim 12 (depends on 11) The defected ground structure with the shielding effect as claimed in claim 11, further comprising: a second microstrip line, disposed on the first surface, and parallel to the first microstrip line.