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US 2011/0084606 A1Published application
Device for the generation of microwaves
OwnerFredrik Olsson, Magnus Karlssoninventors
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OwnerFredrik Olsson, Magnus Karlssoninventors
Estimating the term…
The invention relates to a device for the generation of microwaves, comprising a virtual cathode oscillator (1) in coaxial construction having an outer substantially cylindrical tube constituting a cathode (2) and connected to a transmission conductor (14) for feeding the cathode (2) with voltage pulses, as well as an inner substantially cylindrical tube, at least partially transparent for electrons, constituting an anode (3) and connected to a wave guide (13) for the discharge of microwave radiation generated by the formation of a virtual cathode (4) inside a region enclosed by the anode. The device comprises an electrically conductive structure in the form of a reflector (19) disposed adjacent to the anode (3). The cathode (2) comprises a substantially rotationally symmetric, electrically conductive body (15) having a cavity (16). By configuring the cavity (16) in the body (15) of the cathode with a first, lesser depth to that boundary surface (18) of the body which is directly in front of the peripheral part of the closure of the anode (3) against the cathode, and a second, greater depth to the boundary surface (17) of the body directly in front of the central part of the closure of the anode (3) against the cathode, a device for the generation of microwaves is produced, which has higher efficiency and high peak power.
Device for the generation of microwaves. comprising a virtual cathode oscillator in coaxial construction having an outer substantially cylindrical tube constituting a cathode and connected to a transmission conductor for feeding the cathode with voltage pulses, as well as an inner substantially cylindrical tube, at least partially transparent for electrons, constituting an anode and connected to a wave guide for the discharge of microwave radiation generated by the formation of a virtual cathode inside a region enclosed by the anode, wherein an electrically conductive structure in the form of a reflector is disposed adjacent to the anode, and wherein the cathode comprises a substantially rotationally symmetric, electrically conductive body having a cavity, characterized in that the cavity in the body of the cathode is configured with a first, lesser depth to that boundary surface of the body which is directly in front of the peripheral part of the closure of the anode against the cathode, and a second, greater depth to that boundary surface of the body which is directly in front of the central part of the closure of the anode against the cathode.
Device according to Patent Claim I, characterized in that the closure of the device against the cathode is disposed at a distance to the boundary surface for the first, lesser depth of the body, which distance is substantially equal to an odd multiple of the quarter-wavelength for the microwaves to be generated.
Dependencies are inferred from the claim text.