Waveguide section for connecting rectangular waveguide with elliptical waveguide

• US 3,988,702 A
• Filed: 06/02/1975
• Issued: 10/26/1976
• Est. Priority Date: 06/01/1974
• Status: Expired due to Term

• Current Assignee: Licentia Patent-Verwaltungs-GmbH
• Original Assignee: Licentia Patent-Verwaltungs-GmbH
• Inventors: Kaffenberger, Ernst
• Primary Examiner(s): Gensler, Paul L.
• Application Number:
  US05/582,923
• Time in Patent Office: 512 Days
• Field of Search: 333/21 R, 333/33, 333/98 R
• US Class Current: 333/33
• CPC Class Codes: H01P 5/082 Transitions between hollow waveguides of different shape, e.g. between a rectangular and a circular waveguide

Abstract

A connecting piece for connecting a rectangular waveguide with an elliptical waveguide is composed of a waveguide section having a rectangular cross section identical to that of the rectangular waveguide to be connected, the waveguide section being provided, in the center of at least one of its wide sides, with a cylindrical recess at a distance of 1/8 of the waveguide wavelength with respect to the center of its longitudinal dimension from the plane of connection with the elliptical waveguide, the length of the recess in the longitudinal direction of the waveguide section being less than 1/4 such wavelength and the depth of the recess being selected in dependence on its length to match the two connected waveguides over a broad frequency band.

Claims

1. A connecting device comprising a waveguide section for connecting a rectangular waveguide with a waveguide having an approximately elliptical cross section, wherein said waveguide section has an inner cross section which is identical to that of the rectangular waveguide to be connected and is provided at the center of one of its wide sides, at a distance of about 1/8 λ

_g from the plane of connection with the elliptical waveguide, where λ

_g is the waveguide wavelength, with a first recess having the form of a portion of a cylinder, having a length, in the longitudinal direction of said waveguide section, less than 1/4 λ

_g, and having a depth which is related to its length in a manner such that the two waveguides to be connected will be matched over a broad band.

3. An arrangement as defined in claim 1 wherein each wide side of said waveguide section is provided with a respective first recess.

4. An arrangement as defined in claim 3 wherein the two said first recesses are located symmetrically to the axis of said waveguide section and are identical to one another in shape and dimensions.

5. Arrangement as defined in claim 1 wherein at least one of the wide sides of said waveguide section is provided with an additional recess at a distance of about 3/8 λ

_g, 5/8 λ

_g or 7/8 λ

_g from the plane of connection with the elliptical waveguide, the depth of said additional recess being less than the depth of said first recess and the length of said additional recess being less than 1/4 λ

_g, and said waveguide section includes a waveguide partial section of constant rectangular cross section located between, and separating, said first recess and said additional recess.

6. An arrangement as defined in claim 5 wherein each said recess has the form of a segment of a circular cylinder.

7. An arrangement as defined in claim 5 wherein each wide side of said waveguide section is provided with a respective first recess and a respective additional recess.

8. An arrangement as defined in claim 7 wherein said first recesses in said two wide sides of said waveguide section form a first pair of recesses and said additional recesses in said two wide sides of said waveguide section form a second pair of recesses, and the said recesses of each said pair are located symmetrically to the axis of said waveguide section and are identical to one another in shape and dimensions.

9. An arrangement as defined in claim 5 wherein at least one of the wide sides of said waveguide section is provided with a further recess at a distance of 5/8 λ

_g from the plane of connection with the elliptical waveguide, the depth and length of said further recess being less than the corresponding dimensions of said additional recess.

10. An arrangement as defined in claim 9 wherein each said recess has the form of a segment of a circular cylinder.

11. An arrangement as defined in claim 9 wherein each wide side of said waveguide section is provided with a respective first recess, a respective additional recess, and a respective further recess.

12. An arrangement as defined in claim 10 wherein said first recesses, said additional recesses and said further recesses in said two wide sides of said waveguide section form three respective pairs of recesses and said recesses of each said pair are located symmetrically to the axis of said waveguide section and are identical to one another in shape and dimensions.

13. An arrangement as defined in claim 1 wherein said waveguide section comprises a partial waveguide section having a length of no more than 1/16 λ

_g and disposed between the plane of connection with the elliptical waveguide and said first recess, each wide side of said partial waveguide section being provided with a respective recess having the form of a portion of a cylinder, the recesses in both said wide sides of said partial waveguide section defining parts of a single cylinder and each having a depth less than that of said first recess.

14. An arrangement as defined in claim 13 wherein said first recess has the form of a segment of a circular cylinder.

15. An arrangement as defined in claim 13 wherein each wide side of said waveguide section is provided with a respective first recess.

16. An arrangement as defined in claim 15 wherein the two said first recesses are located symmetrically to the axis of said waveguide section and are identical to one another in shape and dimensions.

2. An arrangement as defined in cliam 1 wherein said first recess has the form of a segment of a circular cylinder.