# US 9,520,647 B2 · Vehicle mounted antenna device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,647 B2 - Document ID: US9520647B2 - Status: Granted - Kind: B2 - Application number: 14/731,889 - Filed: 2015-06-05 - Published: 2015-12-10 - Granted: 2016-12-13 - Earliest claimed: 2014-06-06 - Assignees: Harada Industry Co., Ltd. - Applicants: Harada Industry Co., Ltd. - Inventors: Jun Ito - Web page: https://patentgrep.com/patent/US9520647B2 ## CPC - H01Q 5/335: at the feed, e.g. for impedance matching - H01Q 1/3283: {side-mounted antennas, e.g. bumper-mounted, door-mounted (mounted on windscreens H01Q1/1271)} - H01Q 1/36: Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract A vehicle mounted antenna device installed on a vehicle includes a circuit board, a main element portion, and an auxiliary element portion. The main element portion, which has a substantially planar shape, is disposed on substantially the same plane as the circuit board, functions also as a capacitive antenna designed for a first frequency band, and includes a bent pattern having an antenna capacity substantially equivalent to a solid pattern. The auxiliary element portion includes a distributed constant element portion that is connected in series between the main element portion and an amplifier circuit so as to complement shortage of an antenna length of the main element portion so that the antenna length of the main element portion is designed for a second frequency band. The distributed constant element portion is mounted on the circuit board and has an antenna capacity smaller than that of the main element portion. ## Claims ### Claim 1 A vehicle mounted antenna device installed on a vehicle, comprising: a circuit board on which an amplifier circuit is placed; a substantially planar shaped main element portion that is disposed on substantially the same plane as the circuit board, functions as a capacitive antenna designed for a first frequency band, and includes a bent pattern having an antenna capacity substantially equivalent to a solid pattern; and an auxiliary element portion that includes a distributed constant element portion connected in series between the main element portion and the amplifier circuit so as to complement shortage of an antenna length of the main element portion so that the antenna length of the main element portion is designed for a second frequency band, the distributed constant element portion being mounted on the circuit board and having an antenna capacity smaller than that of the main element portion. ### Claim 2 (depends on 1) The vehicle mounted antenna device according to claim 1, wherein the distributed constant element portion of the auxiliary element portion is patterned in the circuit board. ### Claim 3 (depends on 2) The vehicle mounted antenna device according to claim 2, wherein a line width of the distributed constant element portion of the auxiliary element portion is narrower than that of the bent pattern of the main element portion. ### Claim 4 (depends on 1) The vehicle mounted antenna device according to claim 1, wherein the auxiliary element portion further includes a lumped constant element that is connected in series between the distributed constant element portion and the amplifier circuit so as to finely adjust the antenna length of the main element portion so that the antenna length of the main element portion is designed for the second frequency band, the lumped constant element being mounted on the circuit board and having an inductance smaller than that of the distributed constant element portion. ### Claim 5 (depends on 1) The vehicle mounted antenna device according to claim 1, wherein the auxiliary element portion further includes a body ground cable that is connected in series between the amplifier circuit and a vehicle body so as to finely adjust the antenna length of the main element portion so that the antenna length of the main element portion is designed for the second frequency band, the body ground cable having an antenna capacity smaller than that of the main element portion. ### Claim 6 (depends on 1) The vehicle mounted antenna device according to claim 1, wherein the main element portion is formed by processing a metal plate. ### Claim 7 (depends on 1) The vehicle mounted antenna device according to claim 1, wherein the main element portion is formed by processing a conducting foil of a printed board or a flexible printed board. ### Claim 8 (depends on 1) The vehicle mounted antenna device according to claim 1, wherein the main element portion has, at a side far from the vehicle, a wide pattern wider in line width than the bent pattern. ### Claim 9 (depends on 8) The vehicle mounted antenna device according to claim 8, wherein at least a part of the wide pattern of the main element portion has a portion bent outside a plane of the substantially planar shaped main element portion. ### Claim 10 (depends on 1) The vehicle mounted antenna device according to claim 1, wherein the main element portion includes, as the bent pattern, at least one of a meander shaped pattern, a spiral shaped pattern, and a space-filling-curve shaped pattern. ### Claim 11 A vehicle mounted antenna device installed on a vehicle, comprising: a circuit board on which an amplifier circuit is placed; a substantially planar shaped main element portion that is disposed on substantially the same plane as the circuit board, functions also as a capacitive antenna designed for a first frequency band, and includes a bent pattern having an antenna capacity substantially equivalent to a solid pattern; and an auxiliary element portion that includes a body ground cable that is connected in series between the amplifier circuit and a vehicle body so as to complement shortage of an antenna length of the main element portion so that the antenna length of the main element portion is designed for a second frequency band, the body ground cable having an antenna capacity smaller than that of the main element portion. ### Claim 12 A vehicle mounted antenna device installed on a vehicle, comprising: an amplifier circuit installed on the vehicle; a substantially planar shaped main element portion that functions also as a capacitive antenna designed for a first frequency band and includes a bent pattern having an antenna capacity substantially equivalent to a solid pattern; and an auxiliary element portion that includes a low voltage cable that is connected in series between the main element portion and the amplifier circuit so as to complement shortage of an antenna length of the main element portion so that the antenna length of the main element portion is designed for a second frequency band, the low voltage cable having an antenna capacity smaller than that of the main element portion.