Specific absorption rate reducer, mobile terminal using the same and method therefor

• US 20070173301A1
• Filed: 06/22/2006
• Published: 07/26/2007
• Est. Priority Date: 01/20/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kang, Tae
• Granted Patent: US 7,672,698 B2
• Time in Patent Office: Days
• US Class Current: 455/575.300
• 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 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 1/526 Electromagnetic shields

Abstract

A mobile terminal and a specific absorption rate reducer method are provided, in which a printed circuit board (PCB) is installed in a main-body, a liquid crystal display (LCD) module is installed in a sub-body, a hinge connects the main-body and the sub-body rotatively and generates a current in the opposite direction to a current generated during the operation of the mobile terminal in a calling mode, and a filter controls a frequency pass characteristic of the mobile terminal by controlling the current flowing in the hinge. Accordingly, frequency pass characteristics may be set differently according to frequency bands by controlling the current flowing in the hinge with a filter having a lumped constant circuit.

Claims

1. A specific absorption rate reducer comprising:

a hinge for rotatively connecting a main-body of a mobile terminal and a sub-body of the mobile terminal, and generating a current in the opposite direction to a current generated during the operation of the mobile terminal in a calling mode; and

a filter for controlling a frequency pass characteristic of the mobile terminal by controlling the current flowing in the hinge.

2. The specific absorption rate reducer of claim 1, wherein the sub-body comprises a liquid crystal display (LCD) module, and the filter is connected to the hinge and to a ground pin of the LCD module.

3. The specific absorption rate reducer of claim 1, wherein the main-body comprises a printed circuit board (PCB), and the filter is connected to a ground pin of the PCB and to the hinge.

4. The specific absorption rate reducer of claim 2, wherein the filter comprises at least one of a capacitor, an inductor, and a resistor.

5. The specific absorption rate reducer of claim 2, wherein the filter comprises a lumped constant circuit comprising:

a first capacitor C1, a second capacitor C2, and a third capacitor C3 connected in series;

an inductor L connected in parallel with the second capacitor C2 located in the center of the capacitors C1, C2, and C3; and

a resistor R connected in parallel with the capacitors C1, C2, and C3.

11. The method of claim 3, wherein the filter comprises at least one of a capacitor, an inductor, and a resistor.

12. The method of claim 3, wherein the filter comprises a lumped constant circuit comprising:

a first capacitor C1, a second capacitor C2, and a third capacitor C3 connected in series;

an inductor L connected in parallel with the second capacitor C2 located in the center of the capacitors C1, C2, and C3; and

a resistor R connected in parallel with the capacitors C1, C2, and C3.

6. A mobile terminal comprising:

a main-body;

a sub-body;

a printed circuit board (PCB) installed in the main-body;

a liquid crystal display (LCD) module installed in the sub-body;

a hinge for connecting the main-body and the sub-body rotatively and generating a current in the opposite direction to a current generated during the operation of the mobile terminal in a calling mode; and

a filter for controlling a frequency pass characteristic of the mobile terminal by controlling the current flowing in the hinge.

7. The mobile terminal of claim 6, wherein the filter is connected to the hinge and to a ground pin of the LCD module.

8. The mobile terminal of claim 6, wherein the filter is connected to a ground pin of the PCB and to the hinge.

9. The mobile terminal of claim 7, wherein the filter comprises at least one of a capacitor, an inductor, and a resistor.

10. The mobile terminal of claim 7, wherein the filter comprises a lumped constant circuit comprising:

a first capacitor C1, a second capacitor C2, and a third capacitor C3 connected in series;

an inductor L connected in parallel with the second capacitor C2 located in the center of the capacitors C1, C2, and C3; and

a resistor R connected in parallel with the capacitors C1, C2, and C3.

13. The mobile terminal of claim 8, wherein the filter comprises at least one of a capacitor, an inductor, and a resistor.

14. The mobile terminal of claim 8, wherein the filter comprises a lumped constant circuit comprising:

a first capacitor C1, a second capacitor C2, and a third capacitor C3 connected in series;

an inductor L connected in parallel with the second capacitor C2 located in the center of the capacitors C1, C2, and C3; and

a resistor R connected in parallel with the capacitors C1, C2, and C3.

15. A method for reducing specific absorption rate in a mobile terminal, the method comprising:

rotatively connecting a main-body of a mobile terminal and a sub-body of the mobile terminal with a hinge, and generating a current in the opposite direction to a current generated during the operation of the mobile terminal in a calling mode; and

controlling a frequency pass characteristic of the mobile terminal by controlling the current flowing in the hinge.

16. The method of claim 15, wherein the sub-body comprises a liquid crystal display (LCD) module, and the controlling comprises connecting a filter to the hinge and to a ground pin of the LCD module.

17. The method of claim 15, wherein the main-body comprises a printed circuit board (PCB), and the controlling comprises connecting a filter to a ground pin of the PCB and to the hinge.

18. The method of claim 16, wherein the filter comprises at least one of a capacitor, an inductor, and a resistor.

19. The method of claim 16, wherein the filter comprises a lumped constant circuit comprising:

a first capacitor C1, a second capacitor C2, and a third capacitor C3 connected in series;

an inductor L connected in parallel with the second capacitor C2 located in the center of the capacitors C1, C2, and C3; and

a resistor R connected in parallel with the capacitors C1, C2, and C3.

20. The method of claim 17, wherein the filter comprises at least one of a capacitor, an inductor, and a resistor.

21. The method of claim 17, wherein the filter comprises a lumped constant circuit comprising:

a first capacitor C1, a second capacitor C2, and a third capacitor C3 connected in series;

an inductor L connected in parallel with the second capacitor C2 located in the center of the capacitors C1, C2, and C3; and

a resistor R connected in parallel with the capacitors C1, C2, and C3.