An output section for a microwave amplifier, a microwave amplifier and a circuit for use in a microwave amplifier.

摘要

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 comprises two resonant cavities (C51 and C52) through which the electron beam passes and a third resonant cavity (C53) coupled to cavity (CS1) by a slot (53) and to cavity (C52) by a slot (54).

The output section 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 comprises a travelling wavetube section, or the series arrangement of a standard klystron cavity and two buffer sections.

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.