Apparatuses and methods for mode suppression in rectangular waveguide

Patent metadata

Field	Value
Publication number	US-10615474-B2
Application number	US-201815903941-A
Country	US
Kind code	B2
Filing date	Feb 23, 2018
Priority date	Feb 23, 2018
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A rectangular waveguide device is provided. The rectangular waveguide device comprising: a first broad wall; a second broad wall parallel to the first broad wall; a first narrow wall perpendicular to and connected to the first broad wall and the second broad wall; a second narrow wall parallel to the first narrow wall and connected to the first broad wall and the second broad wall; and at least one slot in the first broad wall.

First claim

What is claimed is:

1. A phase shifter, comprising:
a first broad wall having a first surface;
a second broad wall parallel to the first broad wall and having a second surface;
a first narrow wall perpendicular to and connected to the first broad wall and the second broad wall;
a second narrow wall parallel to the first narrow wall and connected to the first broad wall and the second broad wall;
at least one ferrite portion having a third surface and a fourth surface;
wherein the first surface contacts the third surface;
wherein the second surface contacts the fourth surface;
at least one slot in the first broad wall; and
wherein each slot is one of: covered by a first broadband electromagnetic absorber, at least partially filled with a second broadband electromagnetic absorber, or covered by a conductor.

2. The phase shifter of claim 1 , wherein the first broadband electromagnetic absorber and the second broadband electromagnetic absorber comprise the same material.

3. The phase shifter of claim 1 , wherein a slot covered by a conductor is at least partially filled with the first broadband electromagnetic absorber.

4. The phase shifter of claim 1 , wherein the at least one slot comprises three or more slots each of which is covered by a conductor;
wherein two or more of the covered slots have a different lengths, and
wherein spacings between two or more sets of two of the covered slots are different.

5. The phase shifter of claim 1 , wherein the end of a slot proximate to an end of the phase shifter is displaced, from the end of the phase shifter, by less than one half of a wavelength of the lowest wavelength of an operating band of a fundamental mode in the phase shifter.

6. The phase shifter of claim 1 , further comprising at least one slot in the second broad wall.

7. The phase shifter of claim 6 , wherein the at least one slot of the second broad wall is identical to the at least one slot of the first broad wall; and
if the at least one slot of the first broad wall is at least one of: covered by a first broadband electromagnetic absorber and at least partially filled with a second broadband electromagnetic absorber, the second broad wall is also at least one of: covered by the first broadband electromagnetic absorber and at least partially filled with the second broadband electromagnetic absorber.

8. The phase shifter of claim 7 , wherein the first broadband electromagnetic absorber and the second broadband electromagnetic absorber comprise the same material.

9. A method, comprising:
creating at least one slot in a broad wall of a first portion of a rectangular waveguide;
mounting at least one ferrite portion in the first portion;
attaching the first portion to a second portion of the rectangular waveguide; and
for each slot in the broad wall of the first portion, covering the slot with a first broadband electromagnetic absorber, at least partially filling the slot with a second broadband electromagnetic absorber, or covering the slot with a conductor.

10. The method of claim 9 , further comprising creating at least one slot in a broad wall of the second portion of the rectangular waveguide; and
for each slot in the broad wall of the second portion, covering the slot with a first broadband electromagnetic absorber, at least partially filling the slot with a second broadband electromagnetic absorber, or covering the slot with a conductor.

Assignees

• Honeywell Int Inc

Inventors

• Vaughn Joseph Todd
• Koster Michael

Classifications

• H01P1/182 Primary

  Waveguide phase-shifters (H01P1/181, H01P1/185, H01P1/19 take precedence) · CPC title

• H01P1/19

  using a ferromagnetic device · CPC title

• H01P1/222

  Waveguide attenuators (H01P1/23 takes precedence) · CPC title

• H01P3/12

  Hollow waveguides (H01P3/20 takes precedence) · CPC title

• H01P1/23

  using ferromagnetic material · CPC title