Production of 1.3-mm waves with waveguide magnetrons

The authors succeeded in producing continuous extremely short millimeter waves with waveguide magnetrons [1] of a special type, which will be called "modified waveguide magnetrons" [2] in order to distinguish them from conventional waveguide magnetrons. These magnetrons are very simple in construction and have stability of performance similar to conventional designs. Moreover, the wavelengths of the oscillations obtained with the present magnetrons are half those obtained with the conventional ones, at a given value of the magnetic flux density. Consequently, the present waveguide magnetrons can produce continuous output power of 20 mW at a wavelength of 1.54 mm, and a few milliwatts at a wavelength of 1.34 mm at the magnetic flux density of 45 kG produced with a conventional electromagnet. They can be successfully operated without cooling the tubes with water.