Antenna and electrical apparatus including the same

• US 20090073059A1
• Filed: 07/29/2008
• Published: 03/19/2009
• Est. Priority Date: 07/31/2007
• Status: Abandoned Application

• Current Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Original Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Inventors: Ikegaya, Morihiko
• Application Number:
  US12/219,849
• Publication Number:
  US 20090073059A1
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An antenna includes antenna elements, an electric power feeding portion for supplying an electric power to each of the antenna elements, a short-circuit element for antenna matching electrically connected to the electric power feeding portion, and a ground connected to the short-circuit element. The antenna is built in a chassis made of a metal, and the chassis made of a metal and the ground are electrically connected to each other.

Claims

1. An antenna, comprising:

antenna elements;

an electric power feeding portion for supplying an electric power to each of the antenna elements;

a short-circuit element for antenna matching electrically connected to the electric power feeding portion; and

a ground connected to the short-circuit element,

wherein the antenna is built in a chassis made of a metal, and the chassis made of a metal and the ground are electrically connected to each other.

4. The antenna according to claim 1, wherein when the antenna is built in a chassis of a mobile terminal or an electrical apparatus, a ground of the antenna is provided to face a metallic (conductor) part(s) so as to be close the metallic (conductor) part(s) within the chassis.

6. The antenna according to claim 1, wherein one slot structure and one loop structure are provided between the plurality of antenna elements and the ground of the antenna with a feeding point as a boundary, and the slot structure is larger in size than the loop structure.

7. The antenna according to claim 6, wherein when the antenna is built in the chassis of the mobile terminal or the electrical apparatus, the loop structure of the antenna is installed in a position located at a distance away from a metallic (conductor) part(s).

9. The antenna according to claim 4, wherein the ground of the antenna and at least one antenna element are disposed so as to face each other.

10. The antenna according to claim 7, wherein the loop structure included in the antenna does not include a portion of the ground facing the metallic (conductor) part(s) close thereto within the chassis.

11. The antenna according to claim 4, wherein the ground of the antenna, and the metallic (conductor) part(s) of the chassis are not electrically connected to each other.

12. An electrical apparatus having the antenna according to claim 4 built therein.

2. An antenna built in a chassis of a mobile terminal or an electrical apparatus, comprising:

a single or a plurality of antenna elements; and

a ground,

wherein the ground is electrically connected to a metallic (conductor) portion of the chassis.

5. The antenna according to claim 2, wherein at least one slot structure is provided between the single or plurality of antenna elements and the ground.

8. The antenna according to claim 5, wherein when the plurality of antenna elements are provided in the antenna, at least one antenna element is provided between one antenna element and the ground.

3. An antenna built in a chassis of a mobile terminal or an electrical apparatus, comprising:

a plurality of antenna elements;

a antenna element portion having a loop structure; and

a ground,

wherein the ground is electrically connected to a metallic (conductor) portion of the chassis.