WIDE BAND ANTENNA

• US 20090167622A1
• Filed: 04/27/2006
• Published: 07/02/2009
• Est. Priority Date: 05/02/2005
• Status: Active Grant

• Current Assignee: Yokowo Company Limited
• Original Assignee: Yokowo Company Limited
• Inventors: Ge, JunXiang, Yanagisawa, Wasuke
• Granted Patent: US 8,068,064 B2
• Time in Patent Office: Days
• US Class Current: 343/772
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 13/16 Folded slot antennas
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

There is provided a low-cost wide band antenna having an ultra-wide band and high performance. The wide band antenna includes an antenna element to form a shape of a ridge waveguide open cross-section structure together with GND (10) when it is spread. The antenna element has a ridge element portion (13) corresponding to the ridge portion of the ridge waveguide and a radiation element portion (14) corresponding to the wall of the ridge waveguide and extending from the ridge element portion (13) for electromagnetic wave radiation. Moreover, the antenna element has an opposing auxiliary element (12) having the same shape and structure as the ridge element portion (13). The radiation element portion (14) has an end arranged on the GND (10). The ridge element portion (13) has a tip end connected to a power supply terminal (100).

Claims

1. A wide band antenna comprising:

an antenna element in a shape forming a part or all of an open cross-section structure of a waveguide when being spread on a plane,

wherein the antenna element includes a first element portion for electromagnetic wave radiation and a second element portion for antenna characteristic adjustment, and

wherein a power supply terminal is connected to the first element portion one of through the second element portion and together with the second element portion.

2. A wide band antenna comprising:

an antenna element forming a shape of an open cross-section structure of a ridge waveguide together with a ground plane when being spread on to a plane,

wherein the antenna element includes a ridge element portion for antenna characteristic adjustment corresponding to a ridge portion of the ridge waveguide and a radiation element portion for electromagnetic wave radiation corresponding to a wall of the ridge waveguide and extending from the ridge element portion, with a power supply terminal being connected to a tip end of the ridge element portion.

3. A wide band antenna according to claim 2,

wherein the ridge element portion is formed in an approximately arc shape.

4. A wide band antenna according to claim 3,

wherein the ridge element portion has a one base end structure obtained by cutting the ridge portion of the ridge waveguide in the open cross-section structure in a height direction, and

the radiation element portion extends from a base end of the ridge element portion.

5. A wide band antenna according to claim 3,

wherein the ridge element portion has a both base end structure that is symmetric with a site, at which a height of the ridge portion of the ridge waveguide becomes a maximum, in the open cross-section structure as a center line, and

the radiation element portion extends from each of both base ends of the ridge element portion.

6. A wide band antenna according to claim 5,

wherein the radiation element portion extends from each of the both base ends of the ridge element portion in a predetermined angle direction with respect to the ridge element portion.

7. A wide band antenna according to claim 6,

wherein the radiation element portion extends from each of the both base ends of the ridge element portion vertically to the ridge element portion in mutually opposite directions.

8. A wide band antenna according to claim 7,

wherein two of the antenna elements are set so as to intersect at right angles with a center symmetric line of each ridge element portion as a base point.

9. A wide band antenna according to claim 3,

wherein the ridge element portion has a both base end structure that is symmetric with a site, at which a height of the ridge portion of the ridge waveguide becomes the maximum, in the open cross-section structure as a center line and is bent on a wide plane of the ridge waveguide at a predetermined angle, and

in the radiation element portion, first elements each correspond to a wide wall of the ridge waveguide extend from both base ends of the ridge element portion and share a second element corresponding to a side wall of the ridge waveguide.

10. A wide band antenna according to claim 2, further comprising:

an auxiliary element having the same shape and structure as the ridge element portion of the antenna element,

wherein a base end of the auxiliary element is arranged on a ground plane,

the auxiliary element and the ridge element portion oppose each other on the same plane,

an end of the radiation element portion of the antenna element is arranged on the ground plane, and

the power supply terminal is connected to a site at which a tip end of the auxiliary element and a tip end of the ridge element portion of the antenna element come closest to each other.