US 4,284,922 A · Linear beam microwave amplifier having section comprising three resonant coupled circuits two of which are resonant cavities which interact with the beam

Abstract

A linear beam tube has an input section, a buffer or buncher section, and an output section. The buffer or buncher section comprises two circuits in series, each of which (FIG. 5) comprises two resonant cavities C51 and C52 through which the electron beam passes and a third resonant cavity C53 coupled to cavity C51 by a slot 53 and to cavity C52 by a slot 54. The output section (FIG. 2a) comprises two resonant cavities C1 and C2 through which the beam passes and which are coupled by a slot 5. A third resonant cavity C3 is coupled to cavity C2 by an iris 13, and to an output waveguide 14 by a further iris 15. The input section may comprise a travelling wavetube section, or the series arrangement of a standard klystron cavity and two buffer sections as shown in FIG. 5. Slot or iris couplings may be replaced by a loop coupling as known in the art. The resulting amplifier has an improved bandwidth/efficiency product.

Claims30

Dependent claims

An output section for a microwave amplifier for operating with a predetermined mid-band frequency and having a linear electron beam path for a beam of predetermined velocity in the output section comprising:

a first resonant cavity defining a portion of the beam path and adapted to be coupled to a preceding section of the amplifier only via the beam, the cavity being arranged to interact with the beam,
a second resonant cavity defining a succeeding portion of the beam path and adapted to be coupled to a succeeding section of the amplifier only via the beam, the cavity being arranged to interact with the beam,
the section having no other resonant cavities defining portions of the beam path,
a third resonant cavity,
the cavities being dimensioned for stable operation of the output section and having coupling means adapted to facilitate the said stable operation, the coupling means comprising
a first coupling coupling the first and second cavities other than along the beam path but not coupling the third and first cavities,
a second coupling coupling the third cavity to the second cavity but not coupling the third and first cavities, and
a third coupling for coupling the third cavity to an output transmission line.

5 more elements

A microwave amplifier for operating with a predetermined mid-band frequency, having a linear electron beam path for a beam of predetermined beam voltage and perveance, and comprising:

an output section defining a portion of the beam path;
an electron gun assembly;
a further section including at least an input section, defining the portion of the path between the gun assembly and the output section;
and
a collector;
wherein the output section comprises
first and second resonant cavities arranged to interact with the beam, the first cavity being coupled to the further section only via the beam path and the second cavity being coupled to the collector only via the beam path the output section having no other resonant cavities arranged to interact with the beam, and
at least one resonant circuit arranged to not interact with the beam,
stable operation of the output section being provided by the dimensions of the first and second cavities and of the resonant circuit and by
first coupling means coupling the first and second cavities other than along the beam path, but not coupling the first cavity to the resonant circuit,
second coupling means coupling the second resonant cavity to the resonant circuit but not coupling the resonant circuit to the first cavity, and
third coupling means for coupling the resonant circuit to an output transmission line.

9 more elements

Dependencies are inferred from the claim text.

Linear beam microwave amplifier having section comprising three resonant coupled circuits two of which are resonant cavities which interact with the beam

Life of this patent

Linear beam microwave amplifier having section comprising three resonant coupled circuits two of which are resonant cavities which interact with the beam

Life of this patent

Abstract

Claims30