WIDEBAND ANTENNA

• US 20110205132A1
• Filed: 10/14/2009
• Published: 08/25/2011
• Est. Priority Date: 10/17/2008
• Status: Active Grant

• Current Assignee: Mitsubishi Cable Industries Limited (Mitsubishi Materials Corporation)
• Original Assignee: Mitsubishi Cable Industries Limited (Mitsubishi Materials Corporation)
• Inventors: Baba, Toshiyuki, Nasu, Shoji, Kudo, Toshio, Kashihara, Kazuyuki
• Granted Patent: US 8,599,079 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 1/3291 mounted in or on other locations inside the vehicle or vehicle body
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

Disclosed is an antenna capable of receiving a very wide band of frequencies. The antenna includes a pair of antenna elements and a pair of feeding legs, which are arranged symmetrically with respect to a line L, with a narrow space G in between.

Claims

1. A wideband antenna, comprising:

a pair of planar, conductive antenna elements; and

a pair of planar, conductive band-like feeding legs, wherein

the antenna elements are arranged symmetrically with respect to a symmetric axis,

the band-like feeding legs are arranged symmetrically with respect to the symmetric axis, with a narrow space interposed between the band-like feeding legs,

the band-like feeding legs are connected to adjacent portions of the antenna elements at which the antenna elements are closest to each other, and

a width of each of the band-like feeding legs is increased in a direction away from the connecting portion.

2. The wideband antenna of claim 1, wherein

an outer edge portion of each of the antenna elements that is farthest from the connecting part forms part of an arc,

each of the adjacent portions includes part of a phantom arc, and

each of the legs is joined to the corresponding antenna element along a direction of a tangent line coming into contact with the phantom arc of the adjacent portion, thereby forming a joint portion.

3. The wideband antenna of claim 1, wherein

each of the antenna elements forms a closed annular ring having a window in a central region.

4. The wideband antenna of claim 1, wherein

each of the antenna elements has a substantially oval shape, and

an angle at which a longer axis of the oval shape intersects with the symmetric axis is 40°

to 100°

.

5. The wideband antenna of claim 4, wherein

the angle at which the longer axis of the oval shape intersects with the symmetric axis is about 90°

.

6. The wideband antenna of claim 1, wherein

transmittances of visible light of the antenna elements and the legs are 70% to 95% so that the antenna elements and the legs are transparent to human eyes.

7. The wideband antenna of claim 1, wherein

the antenna elements and the legs are provided on a glass surface of a vehicle.