# US 7,609,217 B2 · Antenna device

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- Number: US 7,609,217 B2
- Document ID: US7609217B2
- Status: Granted
- Kind: B2
- Application number: 11/954,326
- Filed: 2007-12-12
- Published: 2008-07-31
- Granted: 2009-10-27
- Earliest claimed: 2007-01-25
- Assignees: Mitsumi Electric Co., Ltd.
- Inventors: Junichi Noro; Satoshi Kohno
- Web page: https://patentgrep.com/patent/US7609217B2

## CPC

- H01Q 1/1271: {for mounting on windscreens}
- H01Q 1/526: {Electromagnetic shields}
- H01Q 9/0407: {Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## 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

### Claim 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 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 ground (GND) by an outer conductor of the coaxial cable being connected to the shield cover and a GND potential being supplied to the shield cover, 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, wherein the shield cover is mounted on the bottom wall so that the antenna element is supported by the metallic bracket.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.