# US 12,191,577 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 12,191,577 B2 - Document ID: US12191577B2 - Status: Granted - Kind: B2 - Application number: 17/962,551 - Filed: 2022-10-10 - Published: 2023-02-02 - Granted: 2025-01-07 - Earliest claimed: 2017-03-29 - Assignees: Yokowo Co., Ltd. - Applicants: Yokowo Co., Ltd. - Inventors: Hirotoshi Mizuno; Yusuke Yokota - Web page: https://patentgrep.com/patent/US12191577B2 ## CPC - H01Q 5/307: Individual or coupled radiating elements, each element being fed in an unspecified way - H01Q 1/3275: {mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk} - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 9/0407: {Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40)} - H01Q 9/36: with top loading - H01Q 11/08: Helical antennas - H01Q 21/30: Combinations of separate antenna units operating in different wavebands and connected to a common feeder system - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna device includes an antenna housing and an antenna element. The antenna element is accommodated in the antenna housing and receives signals in a first frequency band and a second frequency band which is lower than the first frequency band. The antenna element includes a first element that receives signals in the first frequency band and a second element that surrounds the first element and receives signals in the second frequency band. The first element includes a conductive plate which has a predetermined area, the second element includes a conductive plate which has a predetermined area, and the conductive plates are provided in an identical plane or a substantially identical plane. ## Claims ### Claim 1 An antenna device comprising: an antenna housing; and an antenna element which is accommodated in the antenna housing, wherein the antenna element includes a conductive plate positioned to cause capacitance between the conductive plate and a ground conductor and a plurality of reactance elements, each reactance element having one end coupled to the conductive plate, wherein the antenna element resonates in a very high frequency (VHF) band, wherein the plurality of reactance elements includes a first reactance element and a second reactance element, wherein another end of the first reactance element is coupled to a feeding point and another end of the second reactance element is coupled to the ground conductor, and wherein the conductive plate, the first reactance element, and the second reactance element operate as a series resonance circuit. ### Claim 2 An antenna device comprising: an antenna housing; an antenna element which is accommodated in the antenna housing, wherein the antenna element includes a conductive plate positioned to cause capacitance between the conductive plate and a ground conductor and a plurality of reactance elements, each reactance element having one end coupled to the conductive plate, and wherein the antenna element resonates in a very high frequency (VHF) band; a holder configured to hold the plurality of reactance element; and a printed circuit board having the ground conductor and the feeding point, wherein the printed circuit board is provided below the holder. ### Claim 3 An antenna device comprising: an antenna housing; and an antenna element which is accommodated in the antenna housing, wherein the antenna element includes a conductive plate positioned to cause capacitance between the conductive plate and a ground conductor and a plurality of reactance elements, each reactance element having one end coupled to the conductive plate, wherein the antenna element resonates in a very high frequency (VHF) band, and wherein the antenna device is attached to a roof of a vehicle. ### Claim 4 (depends on 3) The antenna device according to claim 3, further comprising: a prelock member for temporary fixing the antenna device when the antenna device is attached to the vehicle. ### Claim 5 (depends on 3) The antenna device according to claim 3, wherein the conductive plate is configured to load the capacitance into the antenna element. ### Claim 6 (depends on 3) The antenna device according to claim 3, wherein the conductive plate and the reactance elements operate as a series resonance circuit. ### Claim 7 (depends on 3) The antenna device according to claim 3, wherein the plurality of reactance elements includes a first reactance element and a second reactance; element, and wherein another end of the first reactance element is coupled to a feeding point and another end of the second reactance element is coupled to the ground conductor. ### Claim 8 (depends on 7) The antenna device according to claim 7, wherein the first reactance element includes the first coil, wherein the second reactance element includes the second coil, and wherein directions in which the first coil and the second coil are wound are opposite to each other. ### Claim 9 (depends on 7) The antenna device according to claim 7, wherein the first reactance element includes a first coil, wherein the second reactance element includes a second coil, and wherein a first number of turns of the first coil is greater than a second number of turns of the second coil. ### Claim 10 (depends on 7) The antenna device according to claim 7, wherein an electrical length of the first reactance element is longer than an electrical length of the second reactance element. ### Claim 11 An antenna device comprising: an antenna housing; and an antenna element which is accommodated in the antenna housing, wherein the antenna element includes a conductive plate positioned to cause capacitance between the conductive plate and a ground conductor and a plurality of reactance elements, each reactance element having one end coupled to the conductive plate, wherein the antenna element resonates in a very high frequency (VHF) band, wherein the plurality of reactance elements includes a first reactance element and a second reactance element, wherein another end of the first reactance element is coupled to a feeding point and another end of the second reactance element is coupled to the ground conductor, and wherein the first reactance element and the second reactance element are apart from each other and provided not to be positioned in an overlapping manner.