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; and
d. the side walls are shaped to join smoothly with a passage of rectangular cross-section at the rectangular end.
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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.
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Citations
54 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; and d. the side walls are shaped to join smoothly with a passage of rectangular cross-section at the rectangular end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 43, 52)
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- 17. A cast structure sized and configured for guiding or coupling electromagnetic waves, the structure being formed in a single piece by thixoforming a metallic material and having an internal shape configured for removal of a mold core.
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25. A waveguide transition configured to receive at a rectangular input dominant mode transmissions and to produce at an elliptical or other oval output overmoded transmissions, said waveguide transition comprising:
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a body defining an internal shape having; i. a main “
z”
axis running from an input end to an output end;ii. a rectangular cross-sectional shape at said input end with width “
x” and
height “
y”
axes; andiii. an elliptical or other oval cross-sectional shape at said output-end elongated along said “
x”
axis;iv. upper and lower walls being concave and transitioning between said input end and said output end and being characterized by a first derivative of each of the upper and lower walls in the y-z plane being substantially zero at the input and output ends, and by a second derivative of each of the upper and lower walls in the y-z plane changing sign between the input and output ends; v. sidewalls flaring outwardly from the input end to the output end characterized by a first derivative of each of the sidewalls in the x-z plane being substantially zero at the input end, the sidewalls reducing in height at the output end as the concave upper and lower walls merge; wherein the cross-section of the internal shape at the input end is dimensioned to support dominant mode transmission in a frequency range and the cross-section of the internal shape at the output end is dimensioned to support overmoded transmission in the frequency range, providing lower signal attenuation compared with dominant mode transmissions. - View Dependent Claims (26, 27, 28, 44, 53)
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29. A waveguide transition comprising
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 (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 45)
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46. A method of forming a waveguide transition, the method comprising:
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i. thixoform casting a waveguide transition having a first end and a second end and an internal transition passage between the first end and the second end, the cross-section of said transition passage at one of the first and second ends being shaped and dimensioned to support dominant mode transmissions in a signal frequency range, and the cross-section of said transition passage at the other of the first and second ends being shaped and dimensioned to support overmoded transmissions in the signal frequency range; and ii. establishing within said transition passage a mode filtering structure capable of suppressing unwanted higher modes within said transition passage more than fundamental mode transmissions. - View Dependent Claims (47, 48, 49, 50, 51)
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54. A method of forming a waveguide component, the method comprising:
thixoform casting the component in a single piece from a metallic material, an internal passage of the component being configured for removal of a mold core.
Specification