Ultrawideband communication antenna

• US 20080143634A1
• Filed: 08/06/2007
• Published: 06/19/2008
• Est. Priority Date: 08/09/2006
• Status: Active Grant

• Current Assignee: Daido Tokushuko Kabushiki Kaisha, Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology)
• Original Assignee: Daido Tokushuko Kabushiki Kaisha, Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology)
• Inventors: Saito, Akihiko, Fukase, Mikiko, Tsutsui, Kazuhisa, Matui, Yoshifumi, Aoyagi, Takahiro
• Granted Patent: US 7,852,269 B2
• Time in Patent Office: Days
• US Class Current: 343/873
• CPC Class Codes: H01Q 1/40 Radiating elements coated with or embedded in protective material
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

According to the ultrawideband communication antenna, since surfaces of the antenna element are coated with the first resin layer and the second resin layer each of which is mixed with the nonmagnetic metal powder and has an insulating property and a high specific inductive capacity, the size is largely reduced. Further, since the nonmagnetic metal powder is used, the first resin layer and the second resin layer are free from a loss of magnetism generated therein, thereby enabling to maintain a loss of the antenna to a low level.

Claims

1. An ultrawideband communication antenna comprising:

an antenna element of which at least one part is coated with an insulating resin layer that is mixed with a nonmagnetic metal powder.

2. The ultrawideband communication antenna according to claim 1,

wherein the antenna element is formed of a flat conductor, and the insulating resin layer covers at least one surface of the antenna element.

3. The ultrawideband communication antenna according to claim 1,

wherein the nonmagnetic metal powder is mixed at a ratio of 10 to 50 vol % with respect to the insulating resin layer.

4. The ultrawideband communication antenna according to claim 1,

wherein the antenna element is formed of a flat conductor, and the insulating resin layer has a complex relative permittivity in a range of 8 to 90 in a planar direction of the conductor.

5. The ultrawideband communication antenna according to claim 1,

wherein the insulating resin layer covers at least one surface of the antenna element at a constant thickness and is molded by injection together with the antenna element that has been placed in a die in advance of the injection molding.