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two-terminal magnetrons

JSC PLUTON (Moscow) has developed a line of new-type magnetron generators — two-terminal magnetrons

Unlike conventional magnetrons, they have 2 terminals — one “active” and one “reactive”. The main power for external devices is transmitted to the “active” terminal, while the “reactive” terminal can be used to connect various passive devices in order to adjust the output characteristics of the generator: for instance, to tune the operating frequency of the generator

 

The operating frequency of the magnetron is switched in “hot” mode in accordance with the changes in reactive load parameters.

The quick adjustment requirements (during a pulse) exclude the presence of mechanical systems. If was suggested to place a reciprocal electronically-controlled low-inertia phase shifter in a short-circuited reactive waveguide.

 To implement this task within the range of 3 cm, it is necessary to:

  1. Use a electronically-controlled semiconductor element capable of smoothly changing its reactive parameters (for instance, capacitance) within 1-10 μs in accordance with external control commands, placed in the short-circuited section of the waveguide (23×10).
  2. Placement: vertically in the reactive terminal waveguide.
  3. Design options — phase shifter based on: variable-capacitance diode or tuning microwave diode or field-effect transistor.
  4. Incident average power in the reactive path — 0.1 – 1 W
  5. Incident pulse power — 100 – 1,000 W
  6. Microwave signal frequency — approx. 10 GHz

Degree of readiness for implementation:

At the moment, technical solutions have been developed for two-terminal magnetron designs within the ranges of 10 – 100 GHz. It is required to perform the selection and placement of an electronically-controlled element.

This technology will be useful for radio detection of targets requiring high resolution in the shortwave and longwave ranges.

Potential fields of application:

Marine radar

Meteorology

Coastal guard or other security purposes (national security)

Port or airport management

Search and rescue