Helix resonator

• US 5,351,023 A
• Filed: 04/21/1993
• Issued: 09/27/1994
• Est. Priority Date: 04/21/1992
• Status: Expired due to Fees

• Current Assignee: Filtronic LK Oy
• Original Assignee: LK Products Oy (Yageo Corporation)
• Inventors: Niiranen, Erkki O.
• Primary Examiner(s): Ham, Seungsook
• Application Number:
  US08/050,917
• Time in Patent Office: 524 Days
• Field of Search: 333/202, 333/205, 333/206, 333/207, 333/219, 333/235, 336/199, 336/200
• US Class Current: 333/202
• CPC Class Codes: H01P 7/005 Helical resonators; Spiral resonators

Abstract

A helix resonator comprises a printed board (1) made of dielectric material, a resonator coil (2) having a high impedance end and a low impedance end and mounted on the printed board and formed by a conductor wound several turns to form a cylindrical coil, an electrically conducting cover (6) surrounding the resonator coil (2), and on the surface of the printed board a strip line (4) of electrically conducting material electrically coupled to the last or second last turn of the resonator coil (2) near the high impedance end.

Claims

1. A helix resonator comprising:

a printed board of electrically insulating material,

a helically wound electrical conductor having a low impedance end and a high impedance end, said high impedance end ending in a terminating end of the conductor, said helically wound electrical conductor being wound around said printed board and being connected to said printed board at a connection point arranged in a region along the conductor within two conductor turns from said terminating end, and

reactive means comprised of a strip line of predetermined length disposed on said printed board of electrically insulating material, wherein

said strip line is coupled to said helically wound electrical conductor at said connection point, and

said strip line has such a form and extends in such a direction in relation to the helically wound electrical conductor that at least part of the strip line is situated on said printed board in a region between said terminating end and said low impedance end of the helically wound electrical conductor, said at least part of the strip line extending toward the low impedance end so that the helically wound electrical conductor also is wound around the at least one part of the strip line.

2. A helix resonator according to claim 1, wherein said printed board of electrically insulating material comprises a protruding section around which said electrical conductor is wound and on which said strip line is disposed.

3. A helix resonator according to claim 2, wherein said strip line extends in a direction parallel to a longitudinal axis of said protruding section.

4. A helix resonator according to claim 2, wherein said strip line extends transversely to a longitudinal direction of said protruding section.

5. A helix resonator according to claim 1, wherein the strip line comprises a coupling pad by which the helically wound electrical conductor is coupled to the strip line.

6. A helix resonator according to claim 1, wherein part of said strip line extends beyond the high impedance end of the helically wound electrical conductor.

7. A helix resonator according to claim 1, wherein the strip line has measurement lines disposed along the strip line and extending transversely therefrom.

8. A helix resonator according to claim 1, wherein the helically wound electrical conductor is supported by the printed board of electrically insulating material.

9. A helix resonator filter having at least one helix resonator comprising:

a printed board of electrically insulating material,

a helically wound electrical conductor having a low impedance end and a high impedance end, said high impedance end ending in a terminating end of the conductor, said helically wound electrical conductor being wound around said printed board and being connected to said printed board at a connection point arranged in a region along the conductor within two conductor turns from said terminating end, and

reactive means comprised of a strip line of predetermined length disposed on said printed board of electrically insulating material, wherein

said strip line is coupled to said helically wound electrical conductor at said connection point, and

said strip line has such a form and extends in such a direction in relation to the helically wound electrical conductor that at least part of the strip line is situated on said printed board in a region between said terminating end and said low impedance end of the helically wound electrical conductor, said at least part of the strip line extending toward the low impedance end so that the helically wound electrical conductor also is wound around the at least one part of the strip line.

10. A helix resonator filter according to claim 9, wherein the filter comprises at least two helix resonators.

11. A helix resonator filter according to claim 10, wherein a resonator frequency of at least one helix resonator is different from a resonant frequency of another helix resonator.

12. A helix resonator filter according to claim 10, wherein each helix resonator has a helically wound electrical conductor which is substantially identical to each other.

13. A circuit board having a circuit adapted to be coupled to a helix resonator comprising:

a printed board of electrically insulating material,

a helically wound electrical conductor having a low impedance end and a high impedance end, said high impedance end ending in a terminating end of the conductor, said helically wound electrical conductor being wound around said printed board and being connected to said printed board at a connection point arranged in a region along the conductor within two conductor turns from said terminating end, and

reactive means comprised of a strip line of predetermined length disposed on said printed board of electrically insulating material, wherein

said strip line is coupled to said helically wound electrical conductor at said connection point, and

said strip line has such a form and extends in such a direction in relation to the helically wound electrical conductor that at least part of the strip line is situated on said printed board in a region between said terminating end and said low impedance end of the helically wound electrical conductor, said at least part of the strip line extending toward the low impedance end so that the helically wound electrical conductor also is wound around the at least one part of the strip line.

14. A radio telephone having a helix resonator comprising:

a printed board of electrically insulating material,

a helically wound electrical conductor having a low impedance end and a high impedance end, said high impedance end ending in a terminating end of the conductor, said helically wound electrical conductor being wound around said printed board and being connected to said printed board at a connection point arranged in a region along the conductor within two conductor turns from said terminating end, and

reactive means comprised of a strip line of predetermined length disposed on said printed board of electrically insulating material, wherein

said strip line is coupled to said helically wound electrical conductor at said connection point, and

said strip line has such a form and extends in such a direction in relation to the helically wound electrical conductor that at least part of the strip line is situated on said printed board in a region between said terminating end and said low impedance end of the helically wound electrical conductor, said at least part of the strip line extending toward the low impedance end so that the helically wound electrical conductor also is wound around the at least one part of the strip line.