Meandered-line bandpass filter

• US 6,885,264 B1
• Filed: 03/06/2003
• Issued: 04/26/2005
• Est. Priority Date: 03/06/2003
• Status: Expired due to Term

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Culver, James W., Vincent, Perry F., Eason, Steve D.
• Primary Examiner(s): Callahan, Timothy P.
• Assistant Examiner(s): Luu, An T.
• Application Number:
  US10/383,367
• Time in Patent Office: 782 Days
• Field of Search: 333/14, 333/213, 333/202, 333/204, 333/216, 333/217
• US Class Current: 333/204
• CPC Class Codes: H01P 1/2039 Galvanic coupling between Input/Output

Abstract

A meandered-line bandpass filter includes a parallel coupled line bandpass filter that has a length and one or more corners. Each of the corners is associated with a reactance that affects the propagation of an electromagnetic wave along the length of the parallel coupled line bandpass filter.

Claims

1. A meandered-line bandpass filter comprising:

a parallel coupled line bandpass filter comprising;

a length and one or more corners, each of the corners being associated with a reactance that affects propagation of an electromagnetic wave alone the length of the parallel coupled line bandpass filter; and

a fractal curve along the length of the parallel coupled line bandpass filter.

2. The meandered-line bandpass filter of claim 1, wherein the fractal curve comprises a first iteration, a second iteration, or a third iteration.

3. The meandered-line bandpass filter of claim 1, wherein the fractal curve comprises a modified Koch curve comprising five segments and four inside angles.

4. The meandered-line bandpass filter of claim 3, wherein the inside angles are each approximately equal to 135 degrees.

5. The meandered-line bandpass filter of claim 1, wherein the fractal curve comprises a plurality of inside angles and a plurality of segments that each have a length, at least one of the inside angles being approximately different from another one of the inside angles and at least one of the lengths being approximately different from another one of the lengths.

6. The meandered-line bandpass filter of claim 1, wherein the fractal curve comprises a plurality of inside angles and a plurality of segments that each have a length, the inside angles being approximately equal to each other and the lengths being approximately equal to each other.

7. The meandered-line bandpass filter of claim 1, wherein the fractal curve comprises two or more segments and one or more inside angles that are each associated with a reactance, one or more of the inside angles each being at least partially embedded in a material that has a dielectric constant that affects the reactance associated with the inside angle.

8. The meandered-line bandpass filter of claim 1, wherein the parallel coupled line bandpass filter comprises a plurality of sections.

9. The meandered-line bandpass filter of claim 1, wherein the parallel coupled line bandpass filter comprises a plurality of sections, each section having a length and a width, two of the sections that are adjacent each other being separated from each other by a distance, the lengths being approximately equal to each other, the widths being approximately equal to each other, and the distances being approximately equal to each other.

10. The meandered-line bandpass filter of claim 1, wherein the parallel coupled line bandpass filter comprises a plurality of sections, each section having a length and a width, two of the sections that are adjacent each other being separated from each other by a distance, at least one of the lengths being approximately different from another one of the lengths, at least one of the widths being approximately different from another one of the widths, and at least one of the distances being approximately different from another one of the distances.

11. The meandered-line bandpass filter of claim 1, wherein the parallel coupled line bandpass filter comprises a conductive element that comprises copper.

12. The meandered-line bandpass filter of claim 1, wherein the parallel coupled line bandpass filter lies on a substrate that comprises FR-4 or Rogers 4350.

13. A method for using a meandered-line bandpass filter, the method comprising:

receiving an electromagnetic wave that has propagated along a length of a parallel coupled line bandpass filter, the parallel coupled line bandpass filter comprising;

one or more corners that are each associated with a reactance that affects the propagation of the electromagnetic wave along the length of the parallel coupled line bandpass filter; and

a fractal curve along the length of the parallel coupled line bandpass filter.

14. The method of claim 13, wherein the fractal curve comprises a first iteration, a second iteration, or a third iteration.

15. The method of claim 13, wherein the fractal curve comprises a modified Koch curve comprising five segments and four inside angles.

16. The method of claim 15, wherein the inside angles are each approximately equal to 135 degrees.

17. The method of claim 13, wherein the fractal curve comprises a plurality of inside angles and a plurality of segments that each have a length, at least one of the inside angles being approximately different from another one of the inside angles and at least one of the lengths being approximately different from another one of the lengths.

18. The method of claim 13, wherein the fractal curve comprises a plurality of inside angles and a plurality of segments that each have a length, the inside angles being approximately equal to each other and the lengths being approximately equal to each other.

19. The method of claim 13, wherein the fractal curve comprises two or more segments and one or more inside angles that are each associated with a reactance, one or more of the inside angles each being at least partially embedded in a material that has a dielectric constant that affects the reactance associated with the inside angle.

20. The method of claim 13, wherein the parallel coupled line bandpass filter comprises a plurality of sections.

21. The method of claim 13, wherein the parallel coupled line bandpass filter comprises a plurality of sections, each section having a length and a width, two of the sections that are adjacent each other being separated from each other by a distance, the lengths being approximately equal to each other, the widths being approximately equal to each other, and the distances being approximately equal to each other.

22. The method of claim 13, wherein the parallel coupled line bandpass filter comprises a plurality of sections, each section having a length and a width, two of the sections that are adjacent each other being separated from each other by a distance, at least one of the lengths being approximately different from another one of the lengths, at least one of the widths being approximately different from another one of the widths, and at least one of the distances being approximately different from another one of the distances.

23. The method of claim 13, wherein the parallel coupled line bandpass filter comprises a conductive element that comprises copper.

24. The method of claim 13, wherein the parallel coupled line bandpass filter lies on a substrate that comprises FR-4 or Rogers 4350.

25. A meandered-line bandpass filter comprising:

a parallel coupled line bandpass filter that comprises a length and a fractal curve along the length of the parallel coupled line bandpass filter, the fractal curve comprising a third iteration of a modified Koch curve, the modified Koch curve comprising five segments and four inside angles, each of the inside angles being associated with a reactance that affects propagation of an electromagnetic wave along the length of the parallel coupled line bandpass filter.