ANTENNA DEVICE

• US 20080180332A1
• Filed: 12/12/2007
• Published: 07/31/2008
• Est. Priority Date: 01/25/2007
• Status: Active Grant

• Current Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Inventors: Kohno, Satoshi, NORO, Junichi
• Granted Patent: US 7,609,217 B2
• Time in Patent Office: Days
• US Class Current: 343/713
• CPC Class Codes: H01Q 1/1271 for mounting on windscreens
• CPC Class Codes: H01Q 1/526 Electromagnetic shields
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40

Abstract

An antenna device attachable to a bottom surface of a resin or glass body of a vehicle, the antenna device includes: an antenna element that has a receiver for receiving radio waves; a circuit board that has a circuit surface having a circuit formed thereon to amplify signals inputted from the antenna element; a shield cover that covers the circuit surface of the circuit board to shield the circuit from interference waves and that is grounded; a coaxial cable that is inserted into the shield cover, that supplies a driving power to the circuit formed on the circuit board, that connects the circuit to a GND, and that outputs signals from the circuit; and a metallic bracket that has a lateral wall surrounding a lateral side of the antenna element and a bottom wall supporting a bottom of the antenna element.

Claims

1. An antenna device attachable to a bottom surface of a resin or glass body of a vehicle, the antenna device comprising:

an antenna element that has a receiver for receiving radio waves;

a circuit board that has a circuit surface having a circuit formed there onto amplify signals inputted from the antenna element;

a shield cover that covers the circuit surface of the circuit board to shield the circuit from interference waves and that is grounded;

a coaxial cable that is inserted into the shield cover, that supplies a driving power to the circuit formed on the circuit board, that connects the circuit to a GND, and that outputs signals from the circuit; and

a metallic bracket that has a lateral wall surrounding a lateral side of the antenna element and a bottom wall supporting a bottom of the antenna element.

2. The antenna device according to claim 1, wherein the lateral wall of the bracket has a regular-polygon shape or a round shape in a horizontal sectional view.

3. The antenna device according to claim 1, wherein the body is one of a roof, an instrument panel, a rear parcel shelf, a trunk lid, a front glass, and a rear glass.

4. The antenna device according to claim 1, wherein a height of the lateral wall is substantially the same as a reception surface of the antenna element.

5. The antenna device according to claim 1, wherein the metallic bracket further has:

a flange extending in parallel to the bottom wall from the lateral wall; and

an attachment portion that extends from the flange and adapted to attach the bottom surface of the body of a vehicle.