Electromagnetic-induction system with optimum antenna layout and the method for forming the same

• US 6,927,742 B2
• Filed: 03/14/2003
• Issued: 08/09/2005
• Est. Priority Date: 03/14/2003
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Aiptek International Incorporated (Aiptek Incorporated)
• Inventors: Chen, Chih-An
• Primary Examiner(s): Dinh, Trinh Vo
• Application Number:
  US10/387,438
• Publication Number:
  US 20040178965A1
• Time in Patent Office: 879 Days
• Field of Search: H01/Q02.1/00, H01/Q00.7/00, 343/741, 343/742, 343/866, 343/867, 343/870, 343/876, 343726-729, 343/855, 342/158, 342/359, 342/448
• US Class Current: 343/867
• CPC Class Codes: H01Q 1/06 Means for the lighting or illuminating of antennas, e.g. for purpose of warning
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

This invention utilizes the design rule with minimum path to design the antenna layout so as to reduce the across-line effect, and it also makes changes in antenna address to design the optimum antenna layout. Furthermore, the single connector is also substituted for a plurality of connectors in the present invention to disperse the connected position of each antenna.

Claims

1. An optimum antenna layout of the electromagnetic-inductive system, the optimum antenna layout comprising:

at least a ground wire;

a plurality of connectors and plurality of pins in each of said connectors, wherein said plurality of pins are arranged in order by using an antenna-address table; and

a plurality of antenna loops, said plurality of antenna loops formed between said plurality of pins of said connectors and said ground wire, and said plurality of antenna loops coupled with said plurality of connectors via said plurality of pins, wherein each of said antenna loop a plurality of n-type sections and a minimum path.

2. The optimum antenna layout according to claim 1, wherein said minimum path comprises a critical electromagnetic-induction region among the surrounding along each of said pins of each of said antenna loops to said ground wire.

3. The optimum antenna layout according to claim 2, wherein said critical electromagnetic-induction region comprises an h-shaped region.

4. An electromagnetic-inductive system with an optimum antenna layout, the electromagnetic-inductive system comprising:

an antenna loop module having a plurality of antenna loops, each of said antenna loops having a minimum path, wherein said plurality of antenna loops are arranged by a first antenna address; and

a control module having a switch sub-circuit and a control sub-circuit, said control module coupled with said antenna loop module, wherein said switch sub-circuit is individually communicated with said plurality of antenna loops and said control sub-circuit, and said control sub-circuit has a table with a second antenna address to control said switch sub-circuit to perform the scanning procedure for said plurality of antenna loops.

5. The electromagnetic-inductive system according to claim 4, wherein said antenna loop module comprises a plurality of first connectors and at least one ground wire, wherein each of said first connectors has a plurality of first pins.

6. The electromagnetic-inductive system according to claim 5, wherein each of said antenna loops is coupled with said each first connector via said each first pin.

7. The electromagnetic-inductive system according to claim 4, wherein each of said antenna loops comprises a plurality of n-type sections.

8. The electromagnetic-inductive system according to claim 4, wherein said minimum path is a critical electromagnetic-induction region among the surrounding along each of said first pins of each of said antenna loops to said ground wire.

9. The electromagnetic-inductive system according to claim 8, wherein said critical electromagnetic-induction region comprises an h-shaped region.

10. The electromagnetic-inductive system according to claim 4, wherein said control module comprises a plurality of second connectors coupled with said antenna loop module, wherein each of said second connectors has a plurality of second pins, and said plurality of second pins are individually coupled with said switch sub-circuit and said antenna loop module.

11. The electromagnetic-inductive system according to claim 10, wherein said switch sub-circuit comprises a plurality of antenna switches, wherein each of said antenna switches is coupled with each of said second pins.

12. The electromagnetic-inductive system according to claim 11, wherein the designed arrangement of said plurality of antenna switches comprises said first antenna address.

13. The electromagnetic-inductive system according to claim 11, wherein the designed arrangement of said plurality of antenna switches comprises said second antenna address.

14. The electromagnetic-inductive system according to claim 4, wherein said control sub-circuit comprises a firmware used to store said table with said second antenna address.

15. An electromagnetic-inductive system with an optimum antenna layout, the electromagnetic-inductive system comprising:

a plurality of first connectors having a plurality of first pins, said plurality of first pins arranged by a first antenna address;

at least one ground wire;

a plurality of antenna loops, each of said antenna loops formed between each of said first pins and said ground wire, and said plurality of antenna loops coupled with said plurality of first connectors via said plurality of first pins, wherein each of said antenna loops has an minimum electromagnetic-induction path;

a control sub-circuit having a table with a second antenna address;

a plurality of second connectors having a plurality of second pins, said plurality of second pins of plurality of second connectors coupled with said plurality of first pins of said plurality of first connectors in order; and

a switch sub-circuit, said switch sub-circuit individually coupled with said plurality of second connectors and said control sub-circuit, said control sub-circuit controls said switch sub-circuit by said table with said second antenna address for performing the scanning procedure of said plurality of antenna loops.

16. The electromagnetic-inductive system according to claim 15, wherein said minimum electromagnetic-induction path is formed by a plurality of n-type sections.

17. The electromagnetic-inductive system according to claim 15, wherein said minimum electromagnetic-induction path is a critical electromagnetic-induction region among the surrounding along each of said first pins of each of said antenna loops to said ground wire.

18. The electromagnetic-inductive system according to claim 17, wherein said critical electromagnetic-induction region comprises a h-shaped region.

19. The electromagnetic-inductive system according to claim 15, wherein said control sub-circuit comprises a firmware for storing said table with said second antenna address.

20. The electromagnetic-inductive system according to claim 15, wherein the amount of said plurality of second connectors is equal to the amount of said plurality of first connectors, and the amount of said plurality of second pins in each of said second connectors is equal to the amount of said plurality of first pins in each of said first connectors.

21. The electromagnetic-inductive system according to claim 15, wherein said switch sub-circuit comprises a plurality of antenna switches that are arranged by said first antenna address, wherein said plurality of antenna switches are coupled with said plurality of second connectors by a first circuit layout.

22. The electromagnetic-inductive system according to claim 21, wherein the designed arrangement in said second antenna address of said table is difference from the designed arrangement in said first antenna address.

23. The electromagnetic-inductive system according to claim 15, wherein said switch sub-circuit comprises a plurality of antenna switches that are arranged by said second antenna address, wherein said plurality of antenna switches are coupled with said plurality of second connectors by a second circuit layout.

24. The electromagnetic-inductive system according to claim 23, wherein the designed arrangement in said second antenna address of said table is the same with the designed arrangement in said first antenna address.