Wide-band distributed rf coupler
First Claim
1. An rf traveling-wave amplifier including:
- a tapered interaction waveguide wherein the cross-section thereof gradually increases from a small first end thereof to a larger second end for propagating electromagnetic energy in a broad frequency band therein;
an input waveguide disposed external to said interaction waveguide for providing electromagnetic waves to be amplified;
a multiplexer distributed coupler circuit disposed external to said interaction waveguide for coupling electromagnetic energy from said input waveguide to said interaction waveguide comprising a plurality of channel frequency filters disposed outside said interaction waveguide, with each filter tuned to a different frequency passband, with each filter coupled to said interaction waveguide at a different appropriate cross-sectional position along the tapered length thereof such that the interaction waveguide cutoff frequency at that position approximately matches the wave frequency propagated by said filter so that electromagnetic energy propagated by the given filter will excite the desired mode of electromagnetic energy to propagate toward said larger second end of said interaction waveguide.
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Abstract
A wide-band distributed coupler for coupling rf energy from an input waveguide into a tapered interaction waveguide in a traveling-wave amplifier comprising a plurality of channel filters connecting between the input and interaction waveguides, with each filter coupled to the interaction waveguide at the appropriate cross-sectional position along its tapered length where the interaction waveguide cutoff frequency approximately matches the wave frequency propagated by the filter. Each filter comprises, in one embodiment, a main coaxial cavity tuned to a distinct center frequency, a first simple isolation cavity for coupling rf energy between the input waveguide and the main cavity, and at least one second simple isolation cavity for coupling energy between the main cavity and the tapered interaction waveguide. This coupler is compatible both in bandwidth and geometry with the tapered interaction waveguide.
240 Citations
13 Claims
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1. An rf traveling-wave amplifier including:
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a tapered interaction waveguide wherein the cross-section thereof gradually increases from a small first end thereof to a larger second end for propagating electromagnetic energy in a broad frequency band therein; an input waveguide disposed external to said interaction waveguide for providing electromagnetic waves to be amplified; a multiplexer distributed coupler circuit disposed external to said interaction waveguide for coupling electromagnetic energy from said input waveguide to said interaction waveguide comprising a plurality of channel frequency filters disposed outside said interaction waveguide, with each filter tuned to a different frequency passband, with each filter coupled to said interaction waveguide at a different appropriate cross-sectional position along the tapered length thereof such that the interaction waveguide cutoff frequency at that position approximately matches the wave frequency propagated by said filter so that electromagnetic energy propagated by the given filter will excite the desired mode of electromagnetic energy to propagate toward said larger second end of said interaction waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wide-band contiguous multiplexing coupler for coupling electromagnetic energy from an input waveguide to propagate in a tapered interaction waveguide in a traveling wave amplifier comprising:
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a plurality of channel frequency filters, each tuned to a different frequency passband, connecting between the input and interaction waveguides, with each filter coupled to said input waveguide at a different longitudinal point along the length of said input waveguide and coupled to said interaction waveguide at a different appropriate cross-sectional position along the tapered length thereof where the interaction waveguide cutoff frequency at that position approximately matches the wave frequency propagated by said filter, and wherein each channel filter comprises; a main cavity tuned to a separate center frequency so as to form with the other channel filters a plurality of approximately contiguous passbands; a first simple isolation cavity for coupling electromagnetic energy from said input waveguide to said main cavity; and at least one second simple isolation cavity for coupling electromagnetic energy from said main cavity to said tapered interaction waveguide. - View Dependent Claims (11, 12, 13)
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Specification