Waveguide transition piece with low reflection

• US 3,928,825 A
• Filed: 05/03/1974
• Issued: 12/23/1975
• Est. Priority Date: 05/04/1973
• Status: Expired due to Term

• Current Assignee: Erich Schuttloffel, Ernst Kaffenberger
• Original Assignee: Erich Schuttloffel, Ernst Kaffenberger
• Inventors: Kaffenberger, Ernst, Schuttloffel, Erich
• Primary Examiner(s): Lawrence, James W.
• Assistant Examiner(s): Nussbaum, Marvin
• Application Number:
  US05/466,861
• Time in Patent Office: 599 Days
• Field of Search: 333/32,33,34,35,21R,21A,98R,27
• US Class Current: 333/34
• CPC Class Codes: H01P 5/082 Transitions between hollow waveguides of different shape, e.g. between a rectangular and a circular waveguide

Abstract

A waveguide transition piece for the broadbanded, low reflection connection of standard rectangular waveguides with smooth or corrugated waveguides with an oval inner cross section. The transition piece is a waveguide with a rectangular inner cross section, and with the central portion of the longer sides of the inner cross section having a widened portion which extends, in the form of linearly widened conical sections over a length of no more than 0.85 waveguide wavelengths in the direction toward the end of the transition piece to which the oval waveguide is to be connected, the widened portion serving substantially to effect a broadbanded matching of the characteristic impedance of the two adjacent waveguides having different inner cross sections which are to be connected by means of concentrated adapter elements which act, at the point where they are disposed, predominantly as parallel capacitances or parallel inductances. The transition piece includes a further waveguide section which is disposed between the connecting plane with the oval waveguide and the end of the waveguide section having the conically widened portion.

Claims

1. In a waveguide transition piece for the broad-banded, low reflection connection of a standard waveguide having a rectangular inner cross section with a smooth or corrugated waveguide having an oval inner cross section, said transition piece being a waveguide with a substantially rectangular inner cross section with the central portion of the longer sides of said inner cross section of a section of said transition piece having a widened portion which extends, in the form of linearly widened conical sections over a length of no more than 0.85 waveguide wavelengths ( lambda H), in the direction toward the end of the transition piece to which the oval waveguide is to be connected, said widened portion serving substantially to effect a broadbanded matching of the characteristic impedance of the two waveguides having different inner cross sections which are to be connected by means of concentrated adapter elements which act, at the point where they are disposed, predominantly as parallel capacitances or parallel inductances;

the improvement wherein said transition piece includes a further waveguide section disposed between the connecting plane with the oval waveguide and the end of the waveguide section having the conically widened portion, said further waveguide section being no longer than lambda H/8 and having a rectangular inner cross section whose longer sides are uniformly circularly widened in the central portion thereof with the diameter of these widened portions being less than the greatest diameter of said conically widened portion.

2. A waveguide transition piece as defined in claim 1 further comprising at least one additional waveguide section which is no more than lambda H/8 in length inserted in the waveguide section with the conically widened portion, said additional waveguide section having a rectangular inner cross section with the central portion of the longer sides being uniformly circularly widened.

3. A waveguide transition piece as defined in claim 2 wherein the diameter of the circularly widened cross section of said additional waveguide sections is different from the diameters of the adjacent conical portions.

4. A waveguide transition piece as defined in claim 2 wherein the diameter of said circularly widened portion of said additional waveguide section is equal to the greatest diameter of the adjacent conical portion.