Modes and Operating Voltages of Interdigital Magnetrons

Methods have been discussed for obtaining a desirable frequency spectrum of the modes of an interdigital resonator, so that it may be possible to get useful operation in more than one mode. The consequences of phase reversal at certain locations in the anode, in the case of nonzero order modes, have been analyzed, together with the effects of phase-shifting fingers. Experimental results have been given, which are seen to be in substantial agreement with theory.