ANTENNA DEVICE

• US 20070171138A1
• Filed: 12/27/2006
• Published: 07/26/2007
• Est. Priority Date: 01/24/2006
• Status: Active Grant

• Current Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Inventors: NORO, Junichi
• Granted Patent: US 7,436,362 B2
• Time in Patent Office: Days
• US Class Current: 343/713
• CPC Class Codes: H01Q 1/1214 through a wall
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk

Abstract

A first antenna portion has a first board having a first face and a second face opposite to the first face, a first antenna element mounted on the first face, and a first electronic circuit mounted on the second face. A second antenna portion has a second board having a third face and a fourth face opposite to the third face, a second antenna element mounted on the third face, and a second electronic circuit mounted on the fourth face. A first conductive wall is provided on the base portion, defining a first shielding space in which the first electronic circuit is accommodated. A second conductive wall provided on the base portion, defining a second shielding space in which the second electronic circuit is accommodated.

Claims

1. An antenna device comprising:

a first antenna portion having;

a first board having a first face and a second face opposite to the first face;

a first antenna element mounted on the first face; and

a first electronic circuit mounted on the second face;

a second antenna portion having;

a second board having a third face and a fourth face opposite to the third face;

a second antenna element mounted on the third face; and

a second electronic circuit mounted on the fourth face;

a conductive base portion; and

a first conductive wall provided on the base portion, defining a first shielding space in which the first electronic circuit is accommodated; and

a second conductive wall provided on the base portion, defining a second shielding space in which the second electronic circuit is accommodated.

2. The antenna device as set forth in claim 1, wherein:

the first conductive wall is monolithically formed on the base portion;

the second conductive wall is monolithically formed on the base portion;

the base portion is formed with a through hole so that cables led out from the first board and the second board is inserted into the through hole.

3. The antenna device as set forth in claim 1, wherein:

the second face of the first board is fixed to the first conductive wall; and

the fourth face of the second board is fixed to the second conductive wall.

4. The antenna device as set forth in claim 1, further comprising:

a case engaged with the base portion and accommodating the antenna portion.

5. The antenna device as set forth in claim 4, further comprising:

a pad covering an outer periphery of the base portion and attached to the case.

6. The antenna device as set forth in claim 1, wherein:

the base portion is comprised of die casting material.

7. The antenna device as set forth in claim 1, wherein:

a part of the first conductive wall is monolithically formed with a part of the second conductive wall.

8. An antenna device comprising:

a first antenna portion having;

a first board having a first face and a second face opposite to the first face;

a first antenna element mounted on the first face; and

a first electronic circuit mounted on the second face;

a second antenna portion having;

a second board having a third face and a fourth face opposite to the third face;

a second antenna element mounted on the third face; and

a second electronic circuit mounted on the fourth face;

a conductive base portion; and

a first conductive wall provided on the base portion, defining a first shielding space in which the first electronic circuit is accommodated; and

a second conductive wall provided on the base portion, defining a second shielding space in which the second electronic circuit is accommodated, wherein;

a part of the first conductive wall is monolithically formed with a part of the second conductive wall so as to electromagnetically separate the first shielding space from the second shielding space.