# US 12,009,609 B2 · Antenna device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,609 B2 - Document ID: US12009609B2 - Status: Granted - Kind: B2 - Application number: 17/484,207 - Filed: 2021-09-24 - Published: 2022-01-13 - Granted: 2024-06-11 - Earliest claimed: 2019-03-26 - Assignees: Denso Corporation; Soken, Inc. - Applicants: Denso Corporation; Soken, Inc. - Inventors: Masakazu Ikeda; Yuuji Kakuya; Kenichiro Sanji; Nobuyasu Okabe; Hiroyuki Izumi - Web page: https://patentgrep.com/patent/US12009609B2 ## CPC - H01Q 9/0421: {with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence)} - H01Q 15/0086: {said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials} - H01Q 1/42: Housings not intimately mechanically associated with radiating elements, e.g. radome - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 1/526: {Electromagnetic shields} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna device includes: a ground plate made of a conductor with a flat plate shape; an opposing conductive plate made of another conductor with a flat plate shape, arranged to space apart from the ground plate by a predetermined distance, and having a power supply point electrically connected to a power supply line; a short-circuit portion electrically connecting the opposing conductive plate and the ground plate; and a radio wave shield body for shielding a propagation of an electric field, which is arranged on an upper side of the opposing conductive plate and is made of a conductor or a dielectric material. Parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit portion and a capacitance between the ground plate and the opposing conductive plate. ## Claims ### Claim 1 An antenna device comprising: a ground plate made of a conductor with a flat plate shape; an opposing conductive plate made of another conductor with a flat plate shape, arranged to space apart from the ground plate by a predetermined distance, and having a power supply point electrically connected to a power supply line; a short-circuit portion electrically connecting the opposing conductive plate and the ground plate; and a radio wave shield body for shielding a propagation of an electric field, which is arranged on an upper side of the opposing conductive plate and is made of a conductor or a dielectric material, wherein: parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit portion and a capacitance between the ground plate and the opposing conductive plate; and the radio wave shield body is arranged so as to contact with an upper surface of an edge portion of the opposing conductive plate. ### Claim 2 (depends on 1) The antenna device according to claim 1, wherein: a distance between the radio wave shield body disposed above the edge portion of the opposing conductive plate and the edge portion of the opposing conductive plate is 1/25 or less of a wavelength at the target frequency. ### Claim 3 (depends on 1) The antenna device according to claim 1, wherein: the radio wave shield body includes an upright portion that stands upright from the edge portion of the opposing conductive plate. ### Claim 4 (depends on 1) The antenna device according to claim 1, wherein: the ground plate and the opposing conductive plate are arranged on a support plate made of a resin material, the antenna device further comprising: a resin case for accommodating the support plate, wherein: the case includes a case top plate portion located above the opposing conductive plate; and a distance between the support plate and the case top plate portion is 1/25 or less of a wavelength at the target frequency to function the case top plate portion as the radio wave shield body. ### Claim 5 (depends on 4) The antenna device according to claim 4, wherein: the case includes a case bottom opposing the ground plate at a predetermined distance therebetween; and the case bottom includes a lower support portion that contacts with an edge portion of the ground plate. ### Claim 6 (depends on 4) The antenna device according to claim 4, wherein: a resin material having a relative permittivity of 2.0 or more is filled as a sealing member between the support plate and the case. ### Claim 7 (depends on 1) The antenna device according to claim 1, wherein: the ground plate and the opposing conductive plate are arranged on a support plate made of a resin material, the antenna device further comprising: a resin case for accommodating the support plate, wherein: the case includes a case top plate portion located above the opposing conductive plate; and the case top plate portion includes an edge contact portion that contacts the edge portion of the opposing conductive plate. ### Claim 8 (depends on 1) The antenna device according to claim 1, wherein: a width of the ground plate in a predetermined direction is one wavelength or less of the radio wave at the target frequency; an upper shield body as the radio wave shield body is arranged on an upper side of the opposing conductive plate; and a lower shield body for shielding the propagation of the electric field, which is made of a conductor or a dielectric material, and is arranged on a lower side of the ground plate. ### Claim 9 (depends on 8) The antenna device according to claim 8, wherein: the ground plate and the opposing conductive plate are arranged on a support plate made of a resin material, the antenna device further comprising: a resin case for accommodating the support plate, wherein: the case includes a case bottom opposing the ground plate at a predetermined distance therebetween; and a distance between the support plate and the case bottom is 1/25 or less of the wavelength at the target frequency to function the case bottom as the lower shield body. ### Claim 10 (depends on 9) The antenna device according to claim 9, wherein: the case includes a case side wall that stands upward from an edge of the case bottom; the case side wall is arranged higher than an upper surface of the support plate; and an inside of the case is filled with a resin material having a relative permittivity of 2.0 or more as a sealing material for covering the upper surface of the support plate.