US3644852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance compensated switch for a rectangular waveguide
Assignee: Bunker Ramo Corp
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Filing: 1969-04-25
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Granted: 1972-02-22
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Expires: 1989-04-25
Abstract
Abstract Apparatus for selectively switching electromagnetic wave energy from one hollow pipe waveguide to one of two similar waveguides disposed at an angle thereto, the apparatus providing a doublemitered, H plane compensated waveguide bend in which the effective width of the waveguide in the plane of the bend is narrowed at the mitered corners and increased on a line bisecting the angle of the bend to provide a low VSWR over a wide bandwidth for both signal paths.
Inventors
- 👤 Thomas K Albee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:27
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/10; H01P1/12; H01P1/122; H01P1/02; H01P1/022; H01P1/027
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
321 words
Apparatus for selectively switching electromagnetic wave energy from one hollow pipe waveguide having a rectangular cross section through a bend to one of two other similar waveguides having coplanar longitudinal axes comprising: a housing having a bore with an arcuate surface normal to the axis of the bend, said housing having first, second and third ports communicating with said bore through said arcuate surface in the plane of the bend, each of said ports being rectangular in cross section and having dimensions substantially the same as said waveguide for coupling thereto, said second and third ports being disposed on opposite sides of said first port with the angles formed by the longitudinal axis of said one waveguide respectively with the longitudinal axis of each of said two other waveguides being substantially equal; a rotor disposed in said bore and mounted for rotation about an axis coincident with the center for said arcuate surface; said rotor having a surface adapted to connect the wall of said first port on the outside of the bend to the wall on the outside of the bend of whichever one of said second and third ports to which wave energy is to be switched, said rotor surface serving as the wall on the outside of the bend of the waveguide within said bore, and said arcuate surface serving as the wall on the inside of the bend of the waveguide within said bore; said rotor including means for increasing the waveguide width in the plane of the bend within said housing between said arcuate surface and said rotor surface along a line bisecting the angle of the bend, and for decreasing the effective waveguide width in the plane of the bend within said housing between said arcuate surface and said rotor surface adjacent the intersection of said arcuate surface with the walls of the ports of the coupled waveguides; and means for selectively rotating said rotor.
Claim 2
Dependent Claim
321 words
Apparatus for selectively switching electromagnetic wave energy from one hollow pipe waveguide having a rectangular cross section through a bend to one of two other similar waveguides having coplanar longitudinal axes comprising: a housing having a bore with an arcuate surface normal to the axis of the bend, said housing having first, second and third ports communicating with said bore through said arcuate surface in the plane of the bend, each of said ports being rectangular in cross section and having dimensions substantially the same as said waveguide for coupling thereto, said second and third ports being disposed on opposite sides of said first port with the angles formed by the longitudinal axis of said one waveguide respectively with the longitudinal axis of each of said two other waveguides being substantially equal; a rotor disposed in said bore and mounted for rotation about an axis coincident with the center for said arcuate surface; said rotor having a surface adapted to connect the wall of said first port on the outside of the bend to the wall on the outside of the bend of whichever one of said second and third ports to which wave energy is to be switched, said rotor surface serving as the wall on the outside of the bend of the waveguide within said bore, and said arcuate surface serving as the wall on the inside of the bend of the waveguide within said bore; said rotor including means for increasing the waveguide width in the plane of the bend within said housing between said arcuate surface and said rotor surface along a line bisecting the angle of the bend, and for decreasing the effective waveguide width in the plane of the bend within said housing between said arcuate surface and said rotor surface adjacent the intersection of said arcuate surface with the walls of the ports of the coupled waveguides; and means for selectively rotating said rotor.
Claim 3
Dependent Claim
31 words
The apparatus of cLaim 1 wherein the angle between longitudinal axis of said one and said other waveguides is 90* and wherein the plane of the bend is the H plane.
Claim 4
Dependent Claim
157 words
The apparatus of claim 1 wherein said rotor surface is defined by a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent said first port, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said second and third ports, and a third surface connecting said first and second surfaces, said third surface being substantially normal to the line bisecting the angle of the bend, wherein the width of the waveguide along the one-quarter angle of the bend lines is between about 91 and 95 percent of the width of the waveguide in the plane of the bend, wherein the width of the waveguide along said line bisecting the angle of the bend is between about 104 and 105 percent of the width of the waveguide in the plane of the bend; and wherein the bend is 90* and in the H plane.
Claim 5
Dependent Claim
54 words
The apparatus of claim 1 wherein said rotor surface is defined by a planar surface normal to the line bisecting the angle of the bend and a pair of arcuate surfaces on opposite sides thereof, said arcuate surfaces being substantially tangential both to said planar surface and to the walls of the connected waveguides.
Claim 6
Dependent Claim
33 words
The apparatus of claim 4 wherein the radius of curvature of said arcuate surfaces is between about 118 and 120 percent of the width of said waveguides in the plane of the bend.
Claim 7
Dependent Claim
88 words
The apparatus of claim 1 wherein said rotor comprises a longitudinal portion of a cylinder having a length greater than the height of said waveguides, said cylinder having a groove in an arcuate portion thereof in a plane normal to the longitudinal axis of said cylinder, the width of said groove being coextensive with the height of said waveguides and the bottom wall of said groove defining said rotor surface, and including impedance compensating means extending between the sidewalls of said groove substantially parallel to said rotor surface.
Claim 8
Dependent Claim
32 words
The apparatus of claim 6 wherein said impedance compensating means comprise an element of electrically conducting material contiguous to the said rotor surface substantially on the one-quarter angle of the bend lines.
Claim 9
Dependent Claim
49 words
The waveguide bend of claim 6 wherein the angle of the waveguide bend is 90*, wherein the plane of the bend is the H plane, and wherein impedance compensating means includes inductive posts spaced from said rotor surface and having a longitudinal axis substantially parallel to said rotor surface.
Claim 10
Dependent Claim
74 words
The apparatus of claim 1 wherein the width of the waveguide along the one quarter angle of the bend lines is between about 91 and 95 percent of the width of the waveguide in the plane of the bend, and wherein the width of the waveguide along the line bisecting the angle of the bend is between about 104 and 105 percent of the width of the waveguide in the plane of the bend.
Claim 11
Dependent Claim
54 words
The apparatus of claim 9 wherein said rotor surface is defined by a planar surface normal to the line bisecting the angle of the bend and a pair of arcuate surfaces on opposite sides thereof, said arcuate surfaces being substantially tangential both to said planar surface and to the walls of the connected waveguides.
Claim 12
Dependent Claim
44 words
The apparatus of claim 10 wherein the bend is 90* and in the H plane, and wherein the radius of curvature of said arcuate surfaces is between about 118 and 120 percent of the width of said waveguides in the plane of the bend.
Claim 13
Dependent Claim
217 words
Apparatus for selectively switching electromagnetic wave energy propagating at microwave frequencies through two rectangular hollow pipe input waveguides through a bend into a selected one of two similar output waveguides comprising: a housing having a cylindrical bore with an axis normal to the plane of the bends and four ports spAced at 90* around said housing in the plane of the bends, said ports communicating with said bore at an angle normal to the axis thereof and having cross-sectional dimensions substantially that of said waveguides, said bore serving as the waveguide wall on the inside of the bend within said housing; and a cylindrical rotor closely fitted within said bore for selective rotation therein about the axis thereof, said rotor having a pair of grooves inwardly extending from opposite sides thereof, the bottom of each of said grooves serving as the waveguide wall on the outside of the bend connecting one of said input ports to the selected one of said output ports within said housing and the sides of each of said grooves serving as the top and bottom walls of the waveguides within said rotor, said rotor having impedance compensating means within said grooves adjacent each of said ports whereby an odd number of reflections are presented to electromagnetic wave energy propagated through said bends.
Claim 14
Dependent Claim
217 words
Apparatus for selectively switching electromagnetic wave energy propagating at microwave frequencies through two rectangular hollow pipe input waveguides through a bend into a selected one of two similar output waveguides comprising: a housing having a cylindrical bore with an axis normal to the plane of the bends and four ports spAced at 90* around said housing in the plane of the bends, said ports communicating with said bore at an angle normal to the axis thereof and having cross-sectional dimensions substantially that of said waveguides, said bore serving as the waveguide wall on the inside of the bend within said housing; and a cylindrical rotor closely fitted within said bore for selective rotation therein about the axis thereof, said rotor having a pair of grooves inwardly extending from opposite sides thereof, the bottom of each of said grooves serving as the waveguide wall on the outside of the bend connecting one of said input ports to the selected one of said output ports within said housing and the sides of each of said grooves serving as the top and bottom walls of the waveguides within said rotor, said rotor having impedance compensating means within said grooves adjacent each of said ports whereby an odd number of reflections are presented to electromagnetic wave energy propagated through said bends.
Claim 15
Dependent Claim
35 words
The apparatus of claim 12 wherein the plane of the bend is the H plane and wherein said impedance compensating means comprise conductive posts extending across said grooves normal to the plane of the bend.
Claim 16
Dependent Claim
78 words
The apparatus of claim 13 wherein the waveguide width in the plane of the bend along the line bisecting the angle of the bend is between about 104 and 105 percent of the width of said input and output waveguides in the plane of the bend and wherein the effective waveguide width in the plane of the bend adjacent said compensating means is between about 91 and 95 percent of the width of said input and output waveguides.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |