A family of Ka-band inverted coaxial magnetrons

A family of Ka-band (35 Gc) inverted coaxial magnetrons has been designed and developed. This group of tubes covers the range of frequencies from 33.4 Gc through 36.4 Gc and provides power output levels from 30 kw peak to 200 kw peak. The inverted coaxial magnetron employs a geometry in which the cathode surrounds the anode. The anode is a right circular cylindrical cavity to which are affixed vane resonators pointing radially outward. Alternate resonators are slot coupled, symmetrically, to the cavity operating in the TE011circular electric mode. This arrangement provides a slow-wave π-mode field pattern at the tips of the resonators for electronic interaction. Power is coupled from a cavity end wall directly into circular waveguide operating in the TE01transmission mode.