Waveguide transitions and method of forming components
First Claim
1. A waveguide transition for transitioning from a rectangular waveguide to an elliptical waveguide, at least one of the waveguides being an overmoded waveguide, the transition having a transition passage, said transition passage including:
- i. a rectangular end having a rectangular cross-section and an elliptical end having an elliptical cross-section, at least one of the rectangular and elliptical ends having a cross-section dimensioned to support overmoded transmission; and
ii. internal top, bottom and side walls connecting the rectangular end and the elliptical end;
wherein;
a. the cross-sectional shape of the top and bottom walls varies continuously between straight at the rectangular end and semi-elliptical at the elliptical end;
b. the top and bottom walls are shaped to join smoothly with a passage of rectangular cross-section at the rectangular end and with a passage of elliptical cross-section at the elliptical end;
c. the cross-sectional shape of the side walls is straight or convex at all points between the rectangular end and the elliptical end, the height of the side walls diminishing continuously along the length of the transition, being larger at the rectangular end than at the elliptical end;
d. the side walls are shaped to join smoothly with a passage of rectangular cross-section at the rectangular end; and
e. the transition passage is configured to support a mode filter by further including one or more slots formed in the internal walls.
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Accused Products
Abstract
A waveguide transition for transitioning from an overmoded waveguide to another waveguide is provided, where one end of the waveguide is configured to connect to a rectangular waveguide and the other end is configured to connect to an elliptical waveguide. The transition has an internal shape having top and bottom walls and two side walls. The top and bottom walls are shaped to join smoothly with waveguides at each end of the transition, while the side walls diminish in height along the length of the transition. The waveguide transition may employ mode filtering to suppress unwanted higher modes. A method of forming waveguide components is also disclosed, involving thixoforming of components in single pieces, the components having internal shapes configured for mold core removal.
236 Citations
28 Claims
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1. A waveguide transition for transitioning from a rectangular waveguide to an elliptical waveguide, at least one of the waveguides being an overmoded waveguide, the transition having a transition passage, said transition passage including:
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i. a rectangular end having a rectangular cross-section and an elliptical end having an elliptical cross-section, at least one of the rectangular and elliptical ends having a cross-section dimensioned to support overmoded transmission; and ii. internal top, bottom and side walls connecting the rectangular end and the elliptical end; wherein; a. the cross-sectional shape of the top and bottom walls varies continuously between straight at the rectangular end and semi-elliptical at the elliptical end; b. the top and bottom walls are shaped to join smoothly with a passage of rectangular cross-section at the rectangular end and with a passage of elliptical cross-section at the elliptical end; c. the cross-sectional shape of the side walls is straight or convex at all points between the rectangular end and the elliptical end, the height of the side walls diminishing continuously along the length of the transition, being larger at the rectangular end than at the elliptical end; d. the side walls are shaped to join smoothly with a passage of rectangular cross-section at the rectangular end; and e. the transition passage is configured to support a mode filter by further including one or more slots formed in the internal walls. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
where X is the lateral displacement of the side wall from the transition axis in the H plane, a is the semi-major axis at the elliptical end, A is the width of the rectangular end, z is the displacement along the length of the transition from the rectangular end, and L is the total length of the transition.
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9. A waveguide transition as claimed in claim 1 wherein the cross-sectional shape of each of the top and bottom walls at any point between the rectangular and elliptical ends is substantially that of an elliptical arc, the eccentricity of the elliptical arc diminishing along the length of the transition.
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10. A waveguide transition as claimed in claim 1 for transitioning from a rectangular dominant mode waveguide to an elliptical overmoded waveguide, the rectangular end having a cross-section dimensioned to support dominant mode transmissions in a frequency range and the elliptical end having a cross-section dimensioned to support overmoded transmissions in the frequency range.
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11. A waveguide transition as claimed in claim 1 wherein the height of the side walls diminishes substantially to zero at the elliptical end.
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12. A manufacturing method comprising:
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i. casting the waveguide transition of claim 1 by employing a thixoforming process; and ii. establishing a mode filter within the transition passage.
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13. A waveguide system including:
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i. a dominant mode input; ii. a dominant mode output; iii. a length of overmoded waveguide between the dominant mode input and the dominant mode output; iv. a first waveguide transition transitioning from the dominant mode input to the overmoded waveguide; and v. a second waveguide transition transitioning from the overmoded waveguide to the dominant mode output; wherein at least one of the first and second waveguide transitions is a waveguide transition as claimed in claim 1.
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14. A waveguide transition comprising:
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i. a casting defining an internal passage extending therethrough having a first end of rectangular cross-section and a second end of non-rectangular cross-section, the cross-section of said passage at one of the first and second ends being shaped and dimensioned to support dominant mode transmissions at a signal frequency, and the cross-section of said passage at the other of the first and second ends being shaped and dimensioned to support overmoded transmissions at the signal frequency; and ii. a metallic mode filter mounted within said passage and configured and positioned to suppress unwanted higher modes more than signals at the signal frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification