Coupler for coupling gyrotron whispering gallery mode RF into HE11 waveguide
First Claim
1. A coupler for a gyrotron, the coupler having:
- a cylindrical waveguide for helically propagating Whispering Gallery (WG) mode Radio Frequency (RF) energy, the cylindrical waveguide terminating in a launch edge;
a first mode converting reflector adjacent to said launch edge and reflecting said WG mode RF energy from said launch edge into free space quasi-Gaussian mode RF energy having an elongate amplitude profile;
a second mode converting reflector receiving said free space quasi-Gaussian mode RF energy and having a reflection surface which generates a circularly symmetric free space quasi-Gaussian mode RF energy distribution at a distance D from said second mode converting reflector;
a corrugated waveguide located at said distance D from said second mode converting reflector and receiving said circularly symmetric free space quasi-Gaussian mode RF energy distribution for propagation in said corrugated waveguide in an HE11 mode.
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Accused Products
Abstract
A cylindrical waveguide with a mode converter transforms a whispering gallery mode from a gyrotron cylindrical waveguide with a helical cut launch edge to a quasi-Gaussian beam suitable for conveyance through a corrugated waveguide. This quasi-Gaussian beam is radiated away from the waveguide using a spiral cut launch edge, which is in close proximity to a first mode converting reflector. The first mode converting reflector is coupled to a second mode converting reflector which provides an output free-space HE11 mode wave suitable for direct coupling into a corrugated waveguide. The radiated beam produced at the output of the second mode converting reflector is substantially circular.
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Citations
19 Claims
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1. A coupler for a gyrotron, the coupler having:
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a cylindrical waveguide for helically propagating Whispering Gallery (WG) mode Radio Frequency (RF) energy, the cylindrical waveguide terminating in a launch edge; a first mode converting reflector adjacent to said launch edge and reflecting said WG mode RF energy from said launch edge into free space quasi-Gaussian mode RF energy having an elongate amplitude profile; a second mode converting reflector receiving said free space quasi-Gaussian mode RF energy and having a reflection surface which generates a circularly symmetric free space quasi-Gaussian mode RF energy distribution at a distance D from said second mode converting reflector; a corrugated waveguide located at said distance D from said second mode converting reflector and receiving said circularly symmetric free space quasi-Gaussian mode RF energy distribution for propagation in said corrugated waveguide in an HE11 mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A coupler for a gyrotron, the coupler having:
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a cylindrical waveguide for Whispering Gallery (WG) mode Radio Frequency (RF) energy, the cylindrical waveguide having a launch edge for said Whispering Gallery Radio Frequency energy; said launch edge coupled to a first mode converting reflector for accepting WG mode RF energy radiated from said launch edge and generating a quasi-Gaussian free-space wave having an elongate amplitude profile; a second mode converting reflector accepting said elongate amplitude profile quasi-Gaussian free space wave and converting the elongate amplitude profile of said quasi-Gaussian free-space wave into a substantially circular amplitude profile, said substantially circular amplitude profile also occurring in a region where said circular amplitude profile also has a minimum beam waist diameter; a corrugated waveguide having an aperture positioned in said region of minimum beam waist diameter and coupling said quasi-Gaussian free-space wave as a guided wave with a HE11 mode; where said cylindrical waveguide, said launch edge, said first mode converting reflector, and said second mode converting reflector are a single structure. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A coupler for whispering gallery mode RF travelling helically in a cylindrical input waveguide, the coupler having:
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a launch edge in said waveguide for launching RF energy; a reflection surface adjacent to said launch edge and receiving said RF energy, said reflection surface having a first curvature in an RF propagation axis and a second curvature perpendicular to said RF propagation axis, said first curvature and said second curvature forming said RF energy into a substantially circularly symmetric free-space RF beam which includes high order TE modes, said RF beam converging to a region having a minimum RF beam diameter; a corrugated waveguide positioned in said region of minimum RF beam diameter and carrying said RF energy from said free-space RF beam in an HE11 mode. - View Dependent Claims (17, 18, 19)
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Specification