Mobile transceiver and antenna device

• US 20070057854A1
• Filed: 08/08/2006
• Published: 03/15/2007
• Est. Priority Date: 09/13/2005
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Higaki, Makoto, Oodachi, Noriaki
• Application Number:
  US11/500,354
• Publication Number:
  US 20070057854A1
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/362 for broadside radiating helical antennas
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A mobile transceiver that can carry out a wireless communication includes a substrate including a wireless circuit; a built-in antenna disposed on a surface of the substrate; a first conductor disposed on the other surface of the substrate; and a second conductor having a ground side grounded to the first conductor, the second conductor being configured to improve the reduction of gain in the direction where the built-in antenna is not disposed.

Claims

1. A mobile transceiver that can carry out a wireless communication comprising:

a substrate including a wireless circuit;

a built-in antenna disposed on a surface of the substrate;

a first conductor disposed on the other surface of the substrate; and

a second conductor having a ground side grounded to the first conductor, the second conductor being configured to improve the reduction of gain in the direction where the built-in antenna is not disposed.

2. The mobile transceiver according to claim 1, wherein

the second conductor has a radiation side which is on the other side of the first conductor and which is disposed apart from the first conductor.

3. The mobile transceiver according to claim 1, wherein

the length of the radiation side of the second conductor is one-half or less of the wavelength of an operation center frequency of the built-in antenna.

4. The mobile transceiver according to claim 1, wherein

a plurality of the second conductors are disposed at intervals corresponding to one-half the wavelength of the operation center frequency of the built-in antenna.

5. The mobile transceiver according to claim 1, wherein

the height of the radiation side of the second conductor from the first conductor is one-fourth or less of the wavelength of the operation center frequency of the built-in antenna.

6. The mobile transceiver according to claim 1, wherein

the ground side of the second conductor is partially grounded to the first conductor at intervals one-tenth or less of the wavelength of the operation center frequency of the built-in antenna.

7. The mobile transceiver according to claim 1, wherein

the ground side of the second conductor is grounded to the first conductor at only both the corners of the ground side.

8. The mobile transceiver according to claim 1, wherein

the second conductor is connected to the first conductor vertically.

9. The mobile transceiver according to claim 1, wherein

the second conductor is formed of a curved surface along with the shape of the first conductor.

10. The mobile transceiver according to claim 1, wherein

the second conductor includes a hole between the radiation side and the ground side.

11. The mobile transceiver according to claim 1, wherein

the second conductor is disposed along the outer peripheral edges of the first conductor.

12. The mobile transceiver according to claim 1, wherein

the second conductor is disposed such that it resonates with the same polarized wave as the polarized wave with which the built-in antenna resonates.

13. The mobile transceiver according to claim 1, wherein

the radiation side of the second conductor is formed in a saw-tooth shape.

14. The mobile transceiver according to claim 1 further comprising:

a dielectric material provided to pinch the first conductor; and

a ground pad connected to the first conductor, wherein

the second conductor is connected to the first conductor through the ground pad.

15. The mobile transceiver according to claim 1, wherein

the second conductor is formed a crisscross shape.

16. The mobile transceiver according to claim 1, wherein

the second conductor is a patch antenna.

17. The mobile transceiver according to claim 1,

wherein a portion of the second conductor other than the outer peripheral portion thereof is composed of a dielectric material, and integrated circuits are mounted on the dielectric material.

18. The mobile transceiver according to claim 1, wherein

the second conductor is mounted on the first conductor as well as integrated with a component of the mobile transceiver located in the vicinity of the second conductor.

19. The mobile transceiver according to claim 1 further comprising:

connection pins disposed to the first conductor, wherein

the second conductor is integrated with a case, and the second conductor is grounded by coming into contact with the connection pins.

20. An antenna device comprising:

a substrate;

a built-in antenna disposed on a surface of the substrate;

a first conductor disposed on the other surface of the substrate; and

a second conductor having a ground side grounded to the first conductor.