Circularly polarized wave generator

Patent metadata

Field	Value
Publication number	US-9929454-B2
Application number	US-201515129466-A
Country	US
Kind code	B2
Filing date	Apr 2, 2015
Priority date	May 30, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A circularly polarized wave generator includes a rectangular hollow waveguide ( 1 ), a plurality of first protrusions ( 2 ) that are provided on one pair of opposing wall surfaces in the waveguide ( 1 ), have longitudinal directions orthogonal to an axial direction of the waveguide ( 1 ), and are arranged at intervals along the axial direction, and a plurality of second protrusions ( 3 ) that are provided between the first protrusions ( 2 ) on the wall surfaces and are arranged with longitudinal directions thereof running along the axial direction.

First claim

The invention claimed is:

1. A circularly polarized wave generator comprising:
a rectangular hollow waveguide;
first protrusions that are provided on one pair of opposing wall surfaces in the waveguide, have longitudinal directions orthogonal to an axial direction of the waveguide, and are arranged at an interval along the axial direction; and
second protrusions that are provided between the first protrusions on the opposing wall surfaces and are arranged with longitudinal directions thereof running along the axial direction.

2. The circularly polarized wave generator according to claim 1 , wherein
a height of each of the first protrusions is different from a height of each of the second protrusions.

3. The circularly polarized wave generator according to claim 1 , wherein
heights of the second protrusions before and after one of the first protrusions positioned adjacent to the second protrusions to be interposed between the second protrusions are different from each other.

4. The circularly polarized wave generator according to claim 1 , wherein
an intersection point of a respective one of the first protrusions and a corresponding one of the second protrusions is positioned on a central axis of the waveguide.

5. The circularly polarized wave generator according to claim 1 , wherein
heights of the first protrusions and of the second protrusions are configured to form a quadratic or cubic Cos curve with a center of the waveguide in the axial direction serving as a vertex.

6. The circularly polarized wave generator according to claim 1 , wherein
each of openings at both ends of the waveguide is formed into a rectangle in which a direction between the opposing wall surfaces serves as the longitudinal direction.

7. The circularly polarized wave generator according to claim 1 , wherein
lengths of the first protrusions in the longitudinal direction and widths of the wall surfaces at both ends of the waveguide are different from the lengths of the first protrusions in the longitudinal direction and the widths of the wall surfaces at a center of the waveguide in the axial direction, respectively.

8. The circularly polarized wave generator according to claim 1 , wherein
thicknesses of the first protrusions vary or an arrangement of the interval of the first protrusions varies.

9. The circularly polarized wave generator according to claim 1 , wherein
widths of the second protrusions are configured to form a quadratic or cubic Cos curve with a center in the axial direction serving as a vertex.

Assignees

• Mitsubishi Electric Corp
• Mitsubishi Electrics Corp

Inventors

• USHIJIMA Yu
• Yukawa Hidenori
• Owada Tetsu
• Nuimura Shuji

Classifications

• H01Q13/06

  Waveguide mouths (horns H01Q13/02) · CPC title

• H01P1/182

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

• H01Q15/244

  converting a linear polarised wave into a circular polarised wave (guided wave H01P1/17) · CPC title

• H01P1/171 Primary

  using a corrugated or ridged waveguide section · CPC title

• H01P3/12

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