Multiband antenna and multiband antenna system

• US 20070188388A1
• Filed: 12/14/2006
• Published: 08/16/2007
• Est. Priority Date: 12/14/2005
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Sun, Peng, Feng, Zheng
• Granted Patent: US 7,623,072 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

A multiband antenna includes an antenna portion having a front surface and a back surface and a ground plane located adjacent to the antenna portion. The multiband antenna includes a front surface side element arranged on the front surface side and connected to a feeding point. The back surface side element arranged on the back surface side and connected to the ground plane.

Claims

1. A multiband antenna provided with an antenna portion having a front surface and a back surface, and a ground plane located adjacent to the antenna portion, comprising:

a front surface side element arranged on the front surface side, which is connected to a feeding point; and

a back surface side element arranged on the back surface side, which is connected to the ground plane.

2. The multiband antenna according to claim 1, wherein

the front surface side element and the back surface side element share the feeding point.

3. The multiband antenna according to claim 1, wherein

the front surface side element is formed of a plurality of elements sharing a common portion connected to the feeding point,

the back surface side element has a portion provided along the common portion, and has a shape bent in a vicinity of a branching portion where the plurality of elements are branched off from the common portion.

4. The multiband antenna according to claim 1, wherein

the front surface side element is formed of a plurality of elements sharing a common portion connected to the feeding point, and

the multiband antenna further comprises a short stub branched off from the common portion and connected to the ground plane.

5. The multiband antenna according to claim 4, wherein

the short stub is provided for achieving an impedance matching of the longest element out of the plurality of elements.

6. The multiband antenna according to claim 1, wherein

a tip portion of the antenna portion is bent.

7. A multiband antenna system comprising:

the multiband antenna according to one of claims 1 to 6; and

a multiplexer configured to achieve an impedance matching corresponding to an electromagnetic radiation received by the multiband antenna.