Traveling wave tube with gain flattening slow wave structure
First Claim
1. In a traveling wave tube, a slow wave structure for causing interaction between an electron beam generated by an electron beam generating means and an electromagnetic signal generated by an electromagnetic signal generating means propagating therethrough and thus providing gain to the electromagnetic signal through said interaction with the electron beam, comprising:
- a main signal interaction section which causes the electromagnetic signal to propagate therethrough with a predetermined first phase velocity and interact with the electron beam to produce maximum signal gain at a predetermined frequency within a predetermined frequency range; and
a gain flattening signal interaction section which is aligned with said main section in a direction of propagation of the electron beam through the slow wave structure and causes the electromagnetic signal to propagate therethrough with a predetermined second phase velocity which is lower than the first phase velocity and interact with the electron beam to produce a minimum signal gain notch region at approximately said predetermined frequency within said predetermined frequency range;
said main and gain flattening sections being coupled together to cause interaction between the electron beam and the electromagnetic signal such that an output signal gain of the slow wave structure over said predetermined frequency range is generally constant.
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Accused Products
Abstract
A traveling wave tube (10) includes a coupled cavity type slow wave structure (100) having a driver stage (52) and an output section (101) with a primary section (64) and a velocity taper section (82) which in combinattion produce maximum signal gain at a predetermined frequency. A gain flattening section (104) is preferably disposed between the driver stage (52) and the primary section (64) of the output section (101), and is designed to operate at a reduced phase velocity selected to produce minimum or negative signal gain at approximately the predetermined frequency. The gain characteristics of the driver stage (52), gain flattening section (104), primary section (64), and velocity taper section (82) combine to produce minimum signal gain variation over an operating frequency range which spans the predetermined frequency, and expand the bandwidth of the traveling wave tube (10).
15 Citations
27 Claims
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1. In a traveling wave tube, a slow wave structure for causing interaction between an electron beam generated by an electron beam generating means and an electromagnetic signal generated by an electromagnetic signal generating means propagating therethrough and thus providing gain to the electromagnetic signal through said interaction with the electron beam, comprising:
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a main signal interaction section which causes the electromagnetic signal to propagate therethrough with a predetermined first phase velocity and interact with the electron beam to produce maximum signal gain at a predetermined frequency within a predetermined frequency range; and a gain flattening signal interaction section which is aligned with said main section in a direction of propagation of the electron beam through the slow wave structure and causes the electromagnetic signal to propagate therethrough with a predetermined second phase velocity which is lower than the first phase velocity and interact with the electron beam to produce a minimum signal gain notch region at approximately said predetermined frequency within said predetermined frequency range; said main and gain flattening sections being coupled together to cause interaction between the electron beam and the electromagnetic signal such that an output signal gain of the slow wave structure over said predetermined frequency range is generally constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a traveling wave tube, a slow wave structure for causing interaction between an electron beam generated by an electron beam generating means and an electromagnetic signal generated by an electromagnetic signal generating means propagating therethrough and thus providing gain to the electromagnetic signal through said interaction with the electron beam, comprising:
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a driver signal interaction stage which causes the electromagnetic signal to propagate therethrough with a predetermined first phase velocity and interact with the electron beam to produce positive signal gain over a predetermined frequency range, and maximum positive signal gain at a predetermined frequency within said predetermined frequency range; and a gain flattening signal interaction section which is disposed downstream of said driver stage in a direction of propagation of the electron beam through the slow wave structure and causes the electromagnetic signal to propagate therethrough with a predetermined second phase velocity which is lower than said first phase velocity to produce a negative signal gain notch region at approximately said predetermined frequency; said driver and gain flattening sections being coupled together to cause interaction between the electron beam and the electromagnetic signal such that an output signal gain of the slow wave structure over said predetermined frequency range is generally constant. - View Dependent Claims (12, 13, 14, 15, 16)
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17. In a traveling wave tube, a slow wave structure for causing interaction between an electron beam generated by an electron beam generating means and an electromagnetic signal generated by an electromagnetic signal generating means propagating therethrough and thus providing gain to the electromagnetic signal through said interaction with the electron beam, comprising:
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a main signal interaction section which causes the electromagnetic signal to propagate therethrough with a predetermined first phase velocity and interact with the electron beam to produce maximum signal gain at a predetermined frequency within a predetermined frequency range; and a gain flattening signal interaction section which is aligned with said main section in a direction of propagation of the electron beam through the slow wave structure and causes the electromagnetic signal to propagate therethrough with a predetermined second phase velocity which is slower than the first phase velocity and interacts with the electron beam to produce a minimum signal gain notch region at approximately said predetermined frequency within said predetermined frequency range; said main and gain flattening sections being coupled together to cause interaction between the electron beam and the electromagnetic signal such that an output signal gain of the slow wave structure over said predetermined frequency range is generally constant; said main section comprising a driver signal interaction stage, and an output signal interaction section coupled together and disposed downstream of said driver stage in said direction of propagation, said driver stage including said gain flattening section. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification