Portable telephone

• US 6,745,057 B1
• Filed: 04/19/2000
• Issued: 06/01/2004
• Est. Priority Date: 05/10/1999
• Status: Expired due to Fees

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Hankui, Eiji
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): TORRES, MARCOS L
• Application Number:
  US09/552,561
• Time in Patent Office: 1,504 Days
• Field of Search: 455/90, 455/550, 455/575, 455/344, 343/841, 343/702, 343/836, 343/837, 343/912, 379/440, 379/451, 361/816
• US Class Current: 455/575.5
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 15/14 Reflecting surfaces; Equivalent structures electromagnetic shields H01Q1/526
• CPC Class Codes: H01Q 19/10 using reflecting surfaces

Abstract

The portable telephone includes an antenna and a metallic cabinet operating as main radiation sources of electromagnetic waves, a feeding point for supplying said antenna and said metallic cabinet with electric power, an outer packaging formed of such a material as plastics or resin, and a reflecting plate for reflecting the electromagnetic waves radiated from said radiation sources, the reflecting plate being provided for increasing the amount of the electromagnetic waves radiated into a free space when the portable telephone is in use, being selectively arranged at a position where an electric field component or a magnetic field component of the electromagnetic waves radiated from said radiation sources is dominant, and having an electric constant which enables effective reflection of said magnetic field component or said electric field component and causes little electric power absorption.

Claims

1. A portable telephone including an antenna and a metallic cabinet operating as main radiation sources of electromagnetic waves, a feeding point for suppling said antenna and said metallic cabinet with electric power, an outer packaging formed of a material such as plastics or resin, and a reflecting plate for reflecting the electromagnetic waves radiated from said radiation sources, wherein

said reflecting plate is provided for increasing the amount of electromagnetic waves radiated into a free space when the portable telephone is in use, selectively arranged at a position where an electric field component or a magnetic field component of the electromagnetic waves radiated from said radiation sources is dominant, and is formed of a magnetic material, and

a ratio of a real part to an imaginary part of a complex relative permeability at a frequency used in the portable telephone of said magnetic material is not more than 0.5.

2. The portable telephone as set forth in claim 1, wherein

said reflecting plate is contained in the outer packaging and provided in the vicinity of said radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed.

3. The portable telephone as set forth in claim 1, wherein said reflecting plate is a flat plate of a predetermined size and arranged in parallel to said metallic cabinet surface.

4. The portable telephone as set forth in claim 1, wherein said reflecting plate is contained in the outer packaging and provided in the vicinity of said radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed, and

a flat plate of a predetermined size and arranged in parallel to said metallic cabinet surface.

5. The portable telephone as set forth in claim 1, wherein said reflecting plate is a flat plate of a predetermined size and arranged aslant with respect to the metallic cabinet surface.

6. The portable telephone as set forth in claim 1, wherein said reflecting plate is contained in the outer packaging and provided in the vicinity of said radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed, and

said reflecting plate is a flat plate of a predetermined size and arranged aslant with respect to the metallic cabinet surface.

7. The portable telephone as set forth in claim 1, wherein said reflecting plate is formed to be convex having a curvature at the side opposite to a direction in which the electromagnetic waves are incident and arranged to have a substantial vertex of the convexity face to the side of said radiation sources.

8. The portable telephone as set forth in claim 1, wherein said reflecting plate is contained in the outer packaging and provided in the vicinity of said radiation sources and on the side where a speech transmission unit a speech reception unit are disposed, and

said reflecting plate is formed to be convex having a curvature at the side opposite to a direction in which the electromagnetic waves are incident and arranged to have a substantial vertex of the convexity face to the side of said radiation sources.

9. The portable telephone as set forth in claim 1, wherein said reflecting plate is bent to be V-shaped toward the side opposite to a direction in which the electromagnetic waves are incident.

10. The portable telephone as set forth in claim 1, wherein said reflecting plate is contained in the outer packaging and provided in the vicinity of said radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed, and

said reflecting plate is bent to be V-shaped toward the side opposite to a direction in which the electromagnetic waves are incident.

11. The portable telephone as set forth in claim 1, wherein said reflecting plate is formed of a magnetic material having a complex relative permeability as causes little power absorption of the electromagnetic waves radiation from said radiation sources.

12. The portable telephone as set forth in claim 1, wherein said reflecting plate is formed of a dielectric material having such a complex relative dielectric constant as causes little power absorption of the electromagnetic waves radiated from said radiation sources.

13. The portable telephone as set forth in claim 1, wherein

said reflecting plate is provided in the plural including:

a reflecting plate formed of a magnetic material having such a complex relative permeability as causes little power absorption of the electromagnetic waves radiated from said radiation sources, and

a reflecting plate formed of a dielectric material having such a complex relative dielectric constant as causes little power absorption of the electromagnetic waves radiated from said radiation sources.

14. The portable telephone as set forth in claim 13, wherein

a reflecting plate formed of a magnetic material is disposed at a region where a magnetic field component of the electromagnetic waves generated from said radiation sources is dominant and a reflecting plate formed of a dielectric material is disposed at a region where an electric field component of the electromagnetic waves generated from said radiation sources is dominant.

15. The portable telephone as set forth in claim 13, wherein

A reflecting plate formed of a magnetic material is disposed to cover the vicinity of said feeding point and a reflecting plate formed of a dielectric material is disposed to cover the vicinity of a lower end portion of said metallic cabinet.

16. The portable telephone as set forth in claim 1, wherein said reflecting plate is a reflecting plate formed of a magnetic material whose complex relative permeability at a frequency used in the portable telephone has a real part value larger than 1 and has an imaginary part value approximate to 0.

17. The portable telephone as set forth in claim 1, wherein said reflecting plate is a reflecting plate formed of a magnetic material whose complex relative permeability at a frequency used in the portable telephone has a real part value larger than 1 and has an imaginary part value approximate to 0 and which has no conductivity.

18. The portable telephone as set forth in claim 1, wherein said reflecting plate is a reflecting plate formed of a dielectric material whose complex relative dielectric constant at a frequency used in the portable telephone has a real part value larger than a value of a real part of a complex relative dielectric constant of said outer packaging and has an imaginary part value approximate to 0.

23. The portable telephone as set forth in claim 1, wherein said reflecting plate has an electric constant which enables effective reflection of said magnetic field component or said electric field component and causes little electric power absorption.

19. A portable telephone including an antenna and a metallic cabinet operating as main radiation sources of electromagnetic waves, a feeding point for supplying said antenna and said metallic cabinet with electric power, and an outer packaging, wherein

said outer packaging is for increasing the amount of electromagnetic waves radiated into a free space when the portable telephone is in use and has a region where an electric field component or a magnetic field component of the electromagnetic waves radiated from said radiation sources is dominant partially provided with a material and

said material is a magnetic material, and a ratio of a real part to an imaginary part of a complex relative permeability at a frequency used in the portable telephone of said magnetic material is not more than 0.5.

20. The portable telephone as set forth in claim 19, wherein in said outer packaging, a part of the surface of the outer packaging which is in the vicinity of said radiation sources and at the side where a speech transmission unit and a speech reception unit are disposed is provided with a region of a magnetic material whose complex relative permeability at a frequency used in the portable telephone has a real part value larger than 1 and has an imaginary part value approximate to 0 and the remaining part is formed of a material such as plastics or region resin.

21. The portable telephone as set forth in claim 19, wherein in said outer packaging, a part of the surface of the outer packaging which is in the vicinity of said radiation sources and at the side where a speech transmission unit and a speech reception unit are disposed is provided with a region of a dielectric material whose complex relative dielectric constant at a frequency used in the portable telephone has a real part value larger than a value of a real part of a complex relative dielectric constant of said material such as plastic or resin and has an imaginary part value approximate to 0 and the remaining part is formed of a material such as plastic or resin.

22. The portable telephone as set forth in claim 19, wherein a magnetic field distribution and an electric field distribution in the vicinity of said radiation surfaces are evaluated in advance to from a part of said outer packaging at a region where a magnetic field component is dominant by using a magnetic material and a part of said outer packaging at a region where an electric field component is dominant by using a dielectric material, form said outer packaging by using said magnetic material and said dielectric material and form the remaining part by using such a material as plastics or resin.

24. The portable telephone as set forth in claim 19, wherein said material has an electric constant which enables effective reflection of said magnetic field component or said electric field component.

25. A portable telephone including an antenna and a metallic cabinet operating as main radiation sources of electromagnetic waves, a feeding point for supplying said antenna and said metallic cabinet with electric power, an outer packaging formed of a material such as plastics or resin, and a reflecting plate for reflecting the electromagnetic waves radiated from said radiation sources, wherein said reflecting plate is disposed so as to cover said feeding point, and is formed of a magnetic material, and a ratio of a real part to an imaginary part of a complex relative permeability at a frequency used in the portable telephone of said magnetic material is not more than 5.