Coupling filter device with specific coupling coefficient

• US 20080048801A1
• Filed: 08/23/2007
• Published: 02/28/2008
• Est. Priority Date: 08/23/2006
• Status: Active Grant

• Current Assignee: Prosperity Dielectrics Co., Ltd.
• Original Assignee: Frontier Electronics Incorporated
• Inventors: Wang, Kuo-Hsiung, Shih, Wei-Ching
• Granted Patent: US 7,609,131 B2
• Time in Patent Office: Days
• US Class Current: 333/177
• CPC Class Codes: H03H 7/0138 Electrical filters or coupling circuits
• CPC Class Codes: H03H 7/1775 Parallel LC in shunt or branch path H03H7/1791 takes precedence

Abstract

The present invention provides a surface mount design (SMD) coupling filter device with a fixed coupling coefficient having a pair of hollow coils. Theoretically, coupling coefficients of two hollow coils may vary with the parameter such as distance, number of windings, inner radius, wire size, medium coefficient. When a desired coil coupling distance is derived from the above parameters, a pair of hollow coils then is fastened fixed by either a house fastening approach or an adhesive injection fastening approach, such that the desired coil coupling distance can be fixed by using an adhesive with a specific medium coefficient.

Claims

1. A coupling filter device with a specific coupling coefficient, comprising:

a set of two hollow coils spaced by a distance d;

a fastening mechanism for fastening said two hollow coils and a fixing adhesive (E) having a specific medium coefficient being filled therein, such that a coupling coefficient (DKn) existing between the hollow coils is substantially a constant; and

a contact portion for contacting with solder pads on a circuit board.

2. The coupling filter device of claim 1, wherein said fastening mechanism is a house fastening structure.

3. The coupling filter device of claim 1, wherein said fastening mechanism is an adhesive injection fastening structure

4. The coupling filter device of claim 2, wherein said house fastening structure further comprises:

a house (10) having trough lines (11, 16) therein for positioning said set of hollow coils (20, 21);

a plurality of insert opens (13, 14, 17, 18) with respect to said trough lines disposing on opposite sides of said house (10) for fixing insert ends (24, 25, 22, 23) of said set hollow coils (20, 21).

5. The coupling filter device of claim 3, wherein said adhesive injection fastening structure is a mold having a coil positioning design such that coils (48, 49) can be inserted and fixed therein and said fixing adhesive (E) is injected therein and then cured.

6. The coupling filter device of claim 3, wherein said house further comprises a chamfer locating outside of said house to auxiliary identify the device'"'"'s orientation.

7. The coupling filter device of claim 1, wherein said contact portion is a surface mount design (SMD).

8. The coupling filter device of claim 1, wherein said contact portion is a through-hole design.

9. The coupling filter device of claim 4, further comprising a divider (15) disposing between two adjacent insert opens of said house and between trough lines and protruding toward said trough lines.

10. The coupling filter device of claim 9, wherein said insert opens protrude two sides of said house (10).

11. The coupling filter device of claim 10, wherein said coils can be customized.

12. The coupling filter device of claim 11, wherein the number of said coils is two.

13. The coupling filter device of claim 11, wherein the winding number of each of said coils is one.

14. The coupling filter device of claim 11, wherein the winding number of each of said coils is two.

15. The coupling filter device of claim 11, wherein the winding number of each of said coils is greater than two.

16. The coupling filter device of claim 13, wherein said insert ends are preprocessed by varnish removal and anti-oxidation.

17. The coupling filter device of claim 1, wherein said device conforms with circuit board automatic process.

18. The coupling filter device of claim 17, wherein said circuit board automatic process disposes the device on a circuit board by actions including grabbing, sucking, positioning and installing.

19. The coupling filter device of claim 1, wherein the device is operable in high frequency range.

20. The coupling filter device of claim 19, wherein the high frequency range comprises Very High Frequency (VHF), Ultra High Frequency (UHF) and Intermediate Frequency (IF).