DOUBLE MITERED COMPENSATED WAVEGUIDE BEND
First Claim
1. A broadband, low VSWR, double mitered waveguide bend for a hollow pipe waveguide having rectangular cross-sectional dimensions comprising a waveguide bend defining housing having two ports adapted to be aligned with the waveguide for the efficient transmission of electromagnetic energy through said housing and having impedance compensating means within said housing adjacent each of said ports, the cross-sectional dimensions of the waveguide within said housing being substantially uniform in the plane normal to the bend, the sidewall of the bend on the outside of the bend being defined by:
- a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said ports, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent the other of said ports, and a third surface connecting said first and second surfaces, said third surface being generally arcuate away from the sidewall on the inside of the bend so that the cross-sectional dimension of the waveguide within said housing in the plane of the bend along a line bisecting the angle of the waveguide bend is greater than the corresponding dimension of the waveguide.
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Accused Products
Abstract
A double mitered, compensated waveguide bend having a low VSWR over a wide bandwidth 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.
233 Citations
27 Claims
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1. A broadband, low VSWR, double mitered waveguide bend for a hollow pipe waveguide having rectangular cross-sectional dimensions comprising a waveguide bend defining housing having two ports adapted to be aligned with the waveguide for the efficient transmission of electromagnetic energy through said housing and having impedance compensating means within said housing adjacent each of said ports, the cross-sectional dimensions of the waveguide within said housing being substantially uniform in the plane normal to the bend, the sidewall of the bend on the outside of the bend being defined by:
- a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said ports, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent the other of said ports, and a third surface connecting said first and second surfaces, said third surface being generally arcuate away from the sidewall on the inside of the bend so that the cross-sectional dimension of the waveguide within said housing in the plane of the bend along a line bisecting the angle of the waveguide bend is greater than the corresponding dimension of the waveguide.
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2. The waveguide bend of claim 1 wherein the angle of the waveguide bend is 90* and wherein the plane of the waveguide bend is the H plane.
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3. The waveguide bend of claim 1 wherein the sidewall of the bend in the inside of the bend is defined by:
- a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said ports, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent the other of said ports, and a third surface connecting said first and second surfaces, said third surface being substantially normal to said line bisecting the angle of the bend.
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4. The waveguide bend of claim 1 wherein said impedance compensating means are located adjacent the sidewall on the inside wall of the bend.
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5. The waveguide bend of claim 1 wherein the dimension of the bend on said line bisecting the angle of the bend is between about 104 and 105 percent of the dimension of the waveguide in the plane of the bend.
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6. The waveguide bend of claim 5 wherein the angle of the waveguide bend is 90* and wherein the plane of the waveguide bend is The H plane;
- and, wherein the sidewall of the bend in the inside of the bend is defined by;
a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said ports, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent the other of said ports, and a third surface connecting said first and second surfaces, said third surface being substantially normal to said line bisecting the angle of the bend.
- and, wherein the sidewall of the bend in the inside of the bend is defined by;
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7. A broadband, low VSWR, double mitered waveguide bend for a hollow pipe waveguide having rectangular cross-sectional dimensions comprising a waveguide bend defining housing having two ports adapted to be aligned with the waveguide for the efficient transmission of electromagnetic energy through said housing and having impedance compensating means within said housing adjacent said ports, the cross-sectional dimensions of the waveguide within said housing being substantially uniform in the plane normal to the bend, the sidewall of the bend on the outside of the bend comprising two discrete surfaces intersecting in a plane bisecting the angle of the bend, said intersecting surfaces forming an obtuse angle facing the sidewall on the inside of the bend so that the cross-sectional dimension of the waveguide within said housing in the plane of the bend along a line bisecting the angle of the waveguide bend is greater than the corresponding dimension of the waveguide.
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8. The waveguide bend of claim 7 wherein the dimension of the bend on said line bisecting the angle of the bend is between about 104 and 105 percent of the dimension of the waveguide in the plane of the bend.
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9. The waveguide bend of claim 8 wherein the sidewall of the bend on the inside of the bend is defined by:
- a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said ports, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent the other of said ports, and a third surface connecting said first and second surfaces, said third surface being substantially normal to said line bisecting the angle of the bend; and
wherein said impedance compensating means comprises an element of electrically conducting material adjacent the sidewall on the inside of the bend.
- a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said ports, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent the other of said ports, and a third surface connecting said first and second surfaces, said third surface being substantially normal to said line bisecting the angle of the bend; and
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10. The waveguide bend of claim 9 wherein the angle of the bend is 90* and wherein the plane of the bend is the H plane.
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11. The waveguide bend of claim 7 wherein the angle of the bend is 90* and wherein the plane of the bend is the H plane.
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12. A broadband, low VSWR, double mitered waveguide bend for a hollow pipe waveguide having rectangular cross-sectional dimensions comprising a waveguide bend defining housing having two ports adapted to be aligned with the waveguide for the efficient transmission of electromagnetic energy through said housing and having impedance compensating means within said housing adjacent said ports, the cross-sectional dimensions of the waveguide within said housing being substantially uniform in the plane normal to the bend, the sidewall of the bend on the inside of the bend comprising two discrete surfaces forming at their intersection on a line bisecting the angle of the bend an obtuse angle facing the sidewall of the bend on the inside of the bend so that the cross-sectional dimension of the waveguide within said housing in the plane of the bend along said line bisecting the angle of the bend is greater than the corresponding dimension of the waveguide.
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13. The waveguide bend of claim 12 wherein the sidewall of the bend on the outside of the bend is defined by:
- a first surface substantially coplanar with one wall of the waveguide externally of said housing adjacent one of said ports, a second surface substantially coplanar with one wall of the waveguide externally of said housing adjacent the other of said ports, and, A third surface connecting said first and second surfaces, said third surface being substantially normal to said line bisecting the angle of the bend.
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14. The waveguide bend of claim 12 wherein the angle of the waveguide bend is 90*, and wherein the plane of the waveguide bend is the H plane.
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15. The waveguide bend of claim 12 wherein the waveguide bend as defined by said sidewalls includes an even number of waveguide sections, a first pair of said sections being of equal length and wider in cross-section in the plane of the bend at their intersection on said line bisecting the angle of the bend than on their respective intersection with one of a second pair of said waveguide sections, said second pair of said sections being of equal length and being wider in cross-section in the plane of the bend at said ports than at their respective intersection with said first pair of sections.
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16. The waveguide bend of claim 15 wherein the number of waveguide sections in the bend is four and wherein the dimension of the bend in the plane thereof on a line bisecting the angle of the bend is between about 104 and 105 percent of the dimension of the waveguide in the plane of the bend.
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17. The waveguide bend of claim 16 wherein the angle of the bend is 90*, and wherein the bend is the H plane.
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18. The waveguide bend of claim 12 wherein the sidewall of the bend on said outside of said bend is defined by a planar surface normal to said 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 sidewalls of the waveguide at said ports.
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19. The waveguide bend of claim 18 wherein the angle of the bend is 90*, wherein the plane of the bend is the H plane, and wherein the radius of curvature of said arcuate surface is between about 118 and 120 percent of the dimension of the waveguide in the plane of the bend.
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20. A broadband, low VSWR, double mitered waveguide bend for a hollow pipe waveguide having rectangular cross-sectional dimensions comprising a waveguide bend defining housing having two ports adapted to be aligned with the waveguide for the efficient transmission of electromagnetic energy through said housing, the cross-sectional dimensions of the waveguide within said housing being substantially uniform in the plane normal to the bend, said waveguide bend including an even number of waveguide sections, a first pair of said sections being of equal length and wider in cross-section in the plane of the bend at their intersection on a line bisecting the angle of the bend than on their respective intersection with one of a second pair of said waveguide sections, said second pair of said sections being of equal length and being wider in cross-section in the plane of the bend at said ports than at their respective intersection with said first pair of sections, said intersections being spaced such that discontinuities defined thereby interact to reduce the VSWR of the bend over a broadband of frequencies.
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21. The waveguide bend of claim 20 wherein the number of waveguide sections in the bend is four and wherein the dimension of the bend in the plane thereof at the intersection of said first and second pair of sections is between about 91 and 95 percent of the dimension of the waveguide in the plane of the bend.
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22. The waveguide bend of claim 20 wherein the dimension of the waveguide bend in the plane of the bend at the intersection of said first pair of sections is between about 104 and 105 percent of the dimension of the waveguide in the plane of the bend.
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23. The waveguide bend of claim 22 wherein the dimension of the waveguide bend in the plane thereof at the intersection of said first and second sections is between about 91 and 95 percent of the dimension of the waveguide in the plane of the bend.
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24. The waveguide bend of claim 23 wherein the Plane of the bend is the H plane;
- and wherein the angle of the bend is 90*.
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25. The waveguide bend of claim 20 wherein the angle of the waveguide bend is 90* and wherein the plane of the bend is the H plane.
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26. The waveguide bend of claim 25 wherein the number of waveguide sections is four, and wherein the dimension of the bend in the plane of the bend along said line bisecting the angle of the bend is between about 104 and 105 percent of the dimension of the waveguide in the plane of the bend.
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27. A broadband, low VSWR, double mitered waveguide bend for a hollow pipe waveguide having rectangular cross-sectional dimensions comprising a waveguide bend defining housing having two ports adapted to be aligned with the waveguide for the efficient transmission of electromagnetic energy through said housing, the cross-sectional dimensions of the waveguide within said housing being substantially uniform in the plane normal to the bend, the effective cross-sectional dimension of the waveguide within said housing in the plane of the bend along a line bisecting the angle of the waveguide bend being greater than the corresponding dimension of the waveguide, and, the effective cross-sectional dimension of the waveguide within said housing in the plane of the bend adjacent said ports being less than the corresponding dimension of the waveguide, said differing effective cross-sectional dimensions interacting to reduce the VSWR of the bend over a broadband of frequencies.
Specification