Coaxial inductive output tube having an annular output cavity

An inductive output tube comprising:

• a cathode disposed about a first axis of the tube;
• a grid disposed apart from said cathode and about said first axis;
• an anode disposed apart from said grid and about said first axis, said anode having a radially disposed gap for allowing a density modulated stream of electrons emitted from said cathode and modulated by said grid to travel in paths approximately orthogonal to said first axis;
• a collector assembly disposed to receive electrons passing through said radially disposed gap;
• an interaction gap disposed between said collector assembly and said anode, said interaction gap receiving said density modulated stream of electrons;
• a cavity coaxial with said first axis, said cavity electromagnetically coupled to said interaction gap;
• an output coupling window through which RF energy is electromagnetically coupled, said output coupling window cylindrical in shape and defining an interior cavity, said output coupling window disposed about said first axis;
• and
• a variable output coupler adjacent to said inner cavity defined by said output coupling window and disposed along said first axis, for adjusting coupling between said inductive output tube and a load coupled to said inductive output tube.

An inductive output tube, comprising:

• a cathode disposed about a first axis of the tube;
• a grid disposed about said cathode;
• an anode disposed about said grid, said anode having a radially disposed gap for allowing a density modulated stream of electrons emitted from said cathode and modulated by said grid to travel in paths approximately orthogonal to said first axis;
• a collector assembly disposed to receive electrons passing through said radially disposed gap;
• an interaction gap disposed between said collector assembly and said anode, said interaction gap receiving said density modulated stream of electrons;
• an output port in said interaction gap, said output port including a non-inductive window;
• a cavity coaxial with said first axis, said cavity electromagnetically coupled to said interaction gap;
• an output coupling window through which RF energy is electromagnetically coupled, said output coupling window in the shape of an annular ring surrounding said cathode and said anode and coaxial with said first axis;
• and
• an output coupler adjacent to said output coupling window disposed along said first axis for adjusting coupling between said inductive output tube and a load coupled to said inductive output tube.

An inductive output tube comprising:

• a cathode disposed about a first axis of the tube;
• a grid disposed apart from said cathode and about said first axis;
• an anode disposed apart from said grid and about said first axis, said anode having a radially disposed gap for allowing a density modulated stream of electrons emitted from said cathode and modulated by said grid to travel in paths approximately orthogonal to said first axis;
• a collector assembly disposed to receive electrons passing through said radially disposed gap;
• an interaction gap disposed between said collector assembly and said anode, said interaction gap receiving said density modulated stream of electrons;
• a first cavity coaxial with said first axis, said first cavity electromagnetically coupled to said interaction gap;
• an output coupling window through which RF energy is electromagnetically coupled, said output coupling window in the shape of an annular ring surrounding said cathode and said anode and coaxial with said first axis;
• and
• an output coupler for adjusting coupling between said inductive output tube and a load coupled to said inductive output tube, said output coupler disposed adjacent to said output coupling window, along said first axis and within a second cavity.