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Traveling wave tube with gain flattening slow wave structure

  • US 5,162,697 A
  • Filed: 08/06/1990
  • Issued: 11/10/1992
  • Est. Priority Date: 08/06/1990
  • Status: Expired due to Term
First Claim
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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:

  • 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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