# US 10,770,780 B2 · Antenna apparatus and circuit board thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,780 B2 - Document ID: US10770780B2 - Status: Granted - Kind: B2 - Application number: 16/002,922 - Filed: 2018-06-07 - Published: 2019-02-14 - Granted: 2020-09-08 - Earliest claimed: 2017-08-10 - Assignees: Microelectronics Technology Inc. - Applicants: Microelectronics Technology, Inc. - Inventors: Chang-Chun Chen; Wei Huang Chen; Tung-Hua Yang - Web page: https://patentgrep.com/patent/US10770780B2 ## CPC - H01Q 1/2208: {associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems (methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00)} - H01Q 1/2216: {used in interrogator/reader equipment} - H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)} - H01Q 9/0428: {radiating a circular polarised wave} - H01Q 19/005: {Patch antenna using one or more coplanar parasitic elements} - H01Q 21/08: the units being spaced along or adjacent to a rectilinear path {(waveguide fed H01Q21/0037)} - H05K 1/0242: {Structural details of individual signal conductors, e.g. related to the skin effect} - H05K 5/04: Metal casings - H05K 2201/09236: Parallel layout - H05K 2201/10098: Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract The present disclosure provides an antenna apparatus and a circuit board thereof for an RFD device to provide wide field effect coverage. The antenna apparatus includes a housing having a concavity defined therein, a printed circuit board disposed inside the concavity of the housing, two plates respectively located on opposite side portions of the circuit board, and a metal pattern sandwiched between and wirelessly coupled to the two plates. By disposing the metal pattern at the central portion of the circuit board and sandwiched between and coupled to the two plates, the field effect is enhanced, and the sensitivity of the antenna apparatus when detecting an object passing through the field (near field detection) is improved. ## Claims ### Claim 1 An antenna apparatus, the antenna apparatus comprising: a metal housing having a concavity defined therein; a circuit board disposed inside the concavity of the housing; two plates respectively located on opposite side portions of the circuit board; and a metal pattern sandwiched between and wirelessly coupled to the two plates. ### Claim 2 (depends on 1) The antenna apparatus of claim 1, wherein the two plates are identically and symmetrically arranged with respect to a central portion of the circuit board. ### Claim 3 (depends on 1) The antenna apparatus of claim 1, wherein each of the two plates is substantially square in shape and has at least one truncated corner. ### Claim 4 (depends on 1) The antenna apparatus of claim 1, wherein each of the two plates has two truncated corners diagonally opposite to one another. ### Claim 5 (depends on 1) The antenna apparatus of claim 1, wherein the metal pattern comprises a single wandering line with two distal ends each pointing toward a respective one of the two plates. ### Claim 6 (depends on 1) The antenna apparatus of claim 1, wherein the metal pattern comprises a plurality of parallel metal lines, and the parallel metal line includes two distal ends each pointing toward a respective one of the two plates. ### Claim 7 (depends on 1) The antenna apparatus of claim 1, wherein the metal pattern comprises a first metal line and two second metal lines disposed at two sides of the first metal line, the first metal line includes a first turn on one side and two second turns on the other side, and the first turn occupies a larger area than the second turn. ### Claim 8 (depends on 1) The antenna apparatus of claim 1, further comprising a metal wire connecting the two plates wherein the metal wire comprises at least one protrusion. ### Claim 9 (depends on 8) The antenna apparatus of claim 8, wherein the metal wire is electrically isolated from the metal pattern. ### Claim 10 A circuit board, comprising: a substrate; two plates respectively located on opposite side portions of the substrate; a metal pattern sandwiched between and wirelessly coupled to the two plates; and a metal wire connecting the two plates. ### Claim 11 (depends on 10) The circuit board of claim 10, wherein each of the two plates is substantially square in shape and has at least one truncated corner. ### Claim 12 (depends on 10) The circuit board of claim 10, wherein each of the two plates has two truncated corners diagonally opposite to one another. ### Claim 13 (depends on 10) The circuit board of claim 10, wherein the metal pattern comprises a single wandering line with two distal ends each pointing toward a respective one of the two plates. ### Claim 14 (depends on 10) The circuit board of claim 10, wherein the metal pattern comprises a plurality of parallel metal lines. ### Claim 15 (depends on 10) The circuit board of claim 10, wherein the metal pattern comprises a first metal line and two second metal lines disposed at two sides of the first metal line. ### Claim 16 (depends on 15) The circuit board of claim 15, wherein the first metal line includes a first turn on one side and two second turns on the other side, and the first turn occupies a larger area than the second turn. ### Claim 17 (depends on 16) The circuit board of claim 16, wherein the first metal line includes two distal ends in the first turn. ### Claim 18 (depends on 10) The circuit board of claim 10, wherein the second metal line includes one turn on one side and two distal ends on the other side. ### Claim 19 (depends on 10) The circuit board of claim 10, further comprising a metal wire connecting the two plates, wherein the metal wire comprises at least one protrusion. ### Claim 20 (depends on 19) The circuit board of claim 19, wherein the metal wire is electrically isolated from the metal pattern.